Disconnected two wifi cards, interfaces still there, still packets coming in

Start with the dmesg output and the rt2x00usb_vendor_request path in the kernel, then reproduce the disconnect with the Raspbian 4.4.32 kernel and firmware on a Pi 3. Compare interface state and packet reception before and after removing the USB cards. Done means disconnected interfaces disappear and no longer receive packets, with the repeated -71 errors explained or resolved.

Had 5 Ralink rt2800 usb wifi cards in monitor mode receiving packets. Disconnected two of them, now the interfaces are still there and there are still packets coming in on those interfaces?

Using the latest Raspbian 4.4.32 kernel and firmware on a Pi3.

This is what dmesg said after disconnecting the wifi sticks:

[  120.797260] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  120.801949] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  120.899006] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  120.911045] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  121.805440] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  121.805999] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  121.905490] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  121.906207] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  122.007107] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  122.112927] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  122.213076] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  122.312989] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  122.413166] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  122.515035] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  122.624650] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  122.729091] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  122.804982] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  122.831344] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  122.905525] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  122.930933] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  123.032947] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  123.133951] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  123.236013] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  123.336400] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  123.436023] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  123.536143] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  123.638850] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  123.799977] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  123.900526] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  124.001123] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  124.102005] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  124.201983] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  124.305815] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  124.405995] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  124.506071] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  124.607373] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  124.707334] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  124.797230] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  124.807199] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  124.898588] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  124.906895] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  125.007669] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  125.109006] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  125.209153] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  125.309096] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  125.420701] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  125.801627] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  125.902454] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  126.797251] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  126.805050] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  126.898010] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  126.905264] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  127.800539] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  127.802177] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  127.900489] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  127.902307] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  128.001982] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  128.102031] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  128.203481] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  128.311276] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  128.411114] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  128.511280] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  128.611011] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  128.712243] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  128.811387] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  128.813633] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  128.914333] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  128.915831] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  129.016407] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  129.116011] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  129.215844] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  129.316183] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  129.425032] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  129.798265] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  129.900000] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  130.000498] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  130.100040] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  130.200295] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  130.299983] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  130.399850] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  130.503507] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  130.603459] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  130.705865] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  130.805470] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  130.805832] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  130.905183] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  130.906100] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  131.006617] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  131.111820] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  131.213141] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  131.313779] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  131.414211] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  131.514508] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  131.618730] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  131.800995] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  131.901158] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  132.808066] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  132.808515] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  132.907984] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  132.908346] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  133.797463] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  133.801393] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  133.904515] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  133.909656] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  134.003971] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  134.104360] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  134.203969] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  134.304694] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  134.410673] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  134.512279] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  134.612175] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  134.713056] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  134.797528] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  134.813492] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  134.896987] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  134.913030] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  135.018033] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  135.118454] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  135.218055] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  135.318054] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  135.418322] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  135.534668] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  135.635267] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  135.796955] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  135.897020] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  135.997240] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  136.098565] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  136.199495] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  136.298878] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  136.399084] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  136.499393] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  136.599041] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  136.708394] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  136.804409] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  136.812750] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  136.904714] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  136.913200] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  137.012897] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  137.112932] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  137.217154] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  137.318123] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  137.418209] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  137.800558] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  137.900904] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  138.802382] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  138.810452] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  138.907410] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  138.924012] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  139.801592] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  139.802706] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  139.900805] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  139.902343] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  140.012100] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  140.113040] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  140.213228] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  140.312958] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  140.413134] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  140.513013] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  140.622195] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  140.723026] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  140.797364] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  140.823125] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  140.897149] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  140.922898] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  141.023248] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  141.136247] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  141.236329] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  141.334775] INFO: rcu_sched self-detected stall on CPU
[  141.334818] 	0-...: (20830 ticks this GP) idle=d1b/140000000000002/0 softirq=13086/13086 fqs=6930 
[  141.334833] 	 (t=21000 jiffies g=6857 c=6856 q=3643)
[  141.334854] Task dump for CPU 0:
[  141.334866] kworker/u8:2    R running      0    69      2 0x00000002
[  141.334921] Workqueue: phy2 rt2x00usb_work_rxdone [rt2x00usb]
[  141.334932] Backtrace: 
[  141.334976] [<80012940>] (dump_backtrace) from [<80012b38>] (show_stack+0x18/0x1c)
[  141.334988]  r6:80000193 r5:80539bc0 r4:b619a200 r3:8053988c
[  141.335037] [<80012b20>] (show_stack) from [<8003fd6c>] (sched_show_task+0xac/0x100)
[  141.335066] [<8003fcc0>] (sched_show_task) from [<80041d8c>] (dump_cpu_task+0x40/0x44)
[  141.335077]  r5:80539bc0 r4:00000000
[  141.335112] [<80041d4c>] (dump_cpu_task) from [<80063f94>] (rcu_dump_cpu_stacks+0x94/0xd0)
[  141.335123]  r4:00000001 r3:00000001
[  141.335155] [<80063f00>] (rcu_dump_cpu_stacks) from [<8006794c>] (rcu_check_callbacks+0x494/0x7dc)
[  141.335166]  r8:362cd000 r7:00000e3b r6:80539bc0 r5:80530e80 r4:b67fde80 r3:fffd9436
[  141.335216] [<800674b8>] (rcu_check_callbacks) from [<8006a480>] (update_process_times+0x40/0x6c)
[  141.335228]  r10:b67fab38 r9:00000020 r8:e81aca63 r7:00000020 r6:e81acf11 r5:00000000
[  141.335260]  r4:b619a200
[  141.335290] [<8006a440>] (update_process_times) from [<80079bd8>] (tick_sched_handle+0x50/0x54)
[  141.335301]  r5:b5417b20 r4:b67fac78
[  141.335329] [<80079b88>] (tick_sched_handle) from [<80079c2c>] (tick_sched_timer+0x50/0x94)
[  141.335355] [<80079bdc>] (tick_sched_timer) from [<8006adf8>] (__hrtimer_run_queues+0x114/0x1ac)
[  141.335366]  r7:b67fab00 r6:b67fab0c r5:b67fac78 r4:b67faac0
[  141.335407] [<8006ace4>] (__hrtimer_run_queues) from [<8006b56c>] (hrtimer_interrupt+0xcc/0x228)
[  141.335418]  r10:b67fab38 r9:b67fab58 r8:b67fab78 r7:b67faac0 r6:00000003 r5:b67faad4
[  141.335450]  r4:8052dac0
[  141.335477] [<8006b4a0>] (hrtimer_interrupt) from [<80328808>] (arch_timer_handler_phys+0x38/0x40)
[  141.335489]  r10:b6e9a39c r9:8020001a r8:00000011 r7:b6004d40 r6:8054177c r5:b6800600
[  141.335521]  r4:b6005cc0
[  141.335551] [<803287d0>] (arch_timer_handler_phys) from [<800602b0>] (handle_percpu_devid_irq+0x74/0x8c)
[  141.335579] [<8006023c>] (handle_percpu_devid_irq) from [<8005bddc>] (generic_handle_irq+0x2c/0x3c)
[  141.335590]  r8:00000000 r7:00000000 r6:b5417dc8 r5:00000000 r4:8052dfbc r3:8006023c
[  141.335638] [<8005bdb0>] (generic_handle_irq) from [<8005c0b4>] (__handle_domain_irq+0x64/0xbc)
[  141.335664] [<8005c050>] (__handle_domain_irq) from [<80010024>] (handle_IRQ+0x24/0x28)
[  141.335675]  r8:ad56f380 r7:b5417b54 r6:ffffffff r5:60000113 r4:800ca228 r3:b5417b20
[  141.335721] [<80010000>] (handle_IRQ) from [<80009450>] (bcm2836_arm_irqchip_handle_irq+0xb0/0xb4)
[  141.335746] [<800093a0>] (bcm2836_arm_irqchip_handle_irq) from [<80013600>] (__irq_svc+0x40/0x54)
[  141.335760] Exception stack(0xb5417b20 to 0xb5417b68)
[  141.335782] 7b20: 00000000 b6e9a39c 00000080 00000000 60000113 00000000 00000001 b6001e80
[  141.335804] 7b40: ad56f380 8020001a b6e9a39c b5417bfc 00000000 b5417b70 800ca214 800ca228
[  141.335818] 7b60: 60000113 ffffffff
[  141.335846] [<800ca0f0>] (__slab_free) from [<800ca8c8>] (kfree+0x158/0x15c)
[  141.335857]  r10:b5416010 r9:8052d14c r8:b63f9004 r7:362cd000 r6:00003cb3 r5:60000113
[  141.335890]  r4:b5417c00
[  141.335916] [<800ca770>] (kfree) from [<802c3464>] (urb_destroy+0x2c/0x30)
[  141.335927]  r9:8052d14c r8:b63f9004 r7:ffffffb9 r6:00000000 r5:60000113 r4:ad56f280
[  141.335970] [<802c3438>] (urb_destroy) from [<802c34a8>] (usb_free_urb+0x40/0x44)
[  141.335981]  r4:ad56f280 r3:ad56f280
[  141.336008] [<802c3468>] (usb_free_urb) from [<802c112c>] (__usb_hcd_giveback_urb+0xc0/0x12c)
[  141.336029] [<802c106c>] (__usb_hcd_giveback_urb) from [<802c11dc>] (usb_hcd_giveback_urb+0x44/0xf4)
[  141.336041]  r7:b5417cd0 r6:ad56f280 r5:ad56f280 r4:b6266800
[  141.336079] [<802c1198>] (usb_hcd_giveback_urb) from [<802e7430>] (completion_tasklet_func+0x64/0x90)
[  141.336091]  r6:ad56f280 r5:b616e800 r4:b6266800 r3:60000113
[  141.336131] [<802e73cc>] (completion_tasklet_func) from [<802f5df8>] (tasklet_callback+0x18/0x1c)
[  141.336143]  r6:80555980 r5:00000000 r4:b63f9000
[  141.336179] [<802f5de0>] (tasklet_callback) from [<8001fbe4>] (tasklet_hi_action+0x88/0x124)
[  141.336204] [<8001fb5c>] (tasklet_hi_action) from [<8001ff34>] (__do_softirq+0x134/0x254)
[  141.336215]  r10:80534080 r9:40000000 r8:00000101 r7:b5416000 r6:80534080 r5:00000000
[  141.336247]  r4:00000001
[  141.336271] [<8001fe00>] (__do_softirq) from [<80020324>] (irq_exit+0xb8/0x120)
[  141.336282]  r10:b600a800 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:00000000
[  141.336314]  r4:8052dfbc
[  141.336339] [<8002026c>] (irq_exit) from [<8005c0b8>] (__handle_domain_irq+0x68/0xbc)
[  141.336350]  r4:8052dfbc r3:802311a0
[  141.336382] [<8005c050>] (__handle_domain_irq) from [<80010024>] (handle_IRQ+0x24/0x28)
[  141.336393]  r8:b4b1c540 r7:b5417dfc r6:ffffffff r5:60000013 r4:8002011c r3:b5417dc8
[  141.336439] [<80010000>] (handle_IRQ) from [<80009450>] (bcm2836_arm_irqchip_handle_irq+0xb0/0xb4)
[  141.336460] [<800093a0>] (bcm2836_arm_irqchip_handle_irq) from [<80013600>] (__irq_svc+0x40/0x54)
[  141.336474] Exception stack(0xb5417dc8 to 0xb5417e10)
[  141.336493] 7dc0:                   00000001 b619a200 00000000 00000000 60000013 b48aac80
[  141.336515] 7de0: b4b0acc0 00000003 b4b1c540 00000000 b600a800 b5417e2c b5417db8 b5417e18
[  141.336532] 7e00: 8001ffd0 8002011c 60000013 ffffffff
[  141.336556] [<800200ac>] (do_softirq) from [<800201e4>] (__local_bh_enable_ip+0xbc/0xd0)
[  141.336567]  r4:00000200 r3:00000003
[  141.336618] [<80020128>] (__local_bh_enable_ip) from [<7f0ae944>] (rt2x00lib_rxdone+0x244/0x58c [rt2x00lib])
[  141.336630]  r5:b48aac80 r4:b48b3038
[  141.336677] [<7f0ae700>] (rt2x00lib_rxdone [rt2x00lib]) from [<7f0bdf40>] (rt2x00usb_work_rxdone+0x50/0x84 [rt2x00usb])
[  141.336689]  r10:b600a800 r9:00000000 r8:00000000 r7:b60cb900 r6:b600a800 r5:b48ab17c
[  141.336721]  r4:b48ab17c
[  141.336756] [<7f0bdef0>] (rt2x00usb_work_rxdone [rt2x00usb]) from [<8003101c>] (process_one_work+0x13c/0x354)
[  141.336768]  r4:b60cd100
[  141.336796] [<80030ee0>] (process_one_work) from [<80031280>] (worker_thread+0x4c/0x4ec)
[  141.336807]  r10:b600a800 r9:b60cd100 r8:00000088 r7:b5416000 r6:b600a814 r5:b60cd118
[  141.336840]  r4:b600a800
[  141.336869] [<80031234>] (worker_thread) from [<800369b8>] (kthread+0xe4/0xfc)
[  141.336880]  r10:00000000 r9:00000000 r8:00000000 r7:80031234 r6:b60cd100 r5:b60cab80
[  141.336912]  r4:00000000
[  141.336937] [<800368d4>] (kthread) from [<8000f808>] (ret_from_fork+0x14/0x2c)
[  141.336948]  r7:00000000 r6:00000000 r5:800368d4 r4:b60cab80
[  141.336980] INFO: rcu_sched detected stalls on CPUs/tasks:
[  141.337010] 	0-...: (20831 ticks this GP) idle=d1b/140000000000002/0 softirq=13086/13086 fqs=6931 
[  141.337022] 	(detected by 3, t=21002 jiffies, g=6857, c=6856, q=3643)
[  141.337042] Task dump for CPU 0:
[  141.337052] kworker/u8:2    R running      0    69      2 0x00000002
[  141.337087] Workqueue: phy2 rt2x00usb_work_rxdone [rt2x00usb]
[  141.337097] Backtrace: 
[  141.337115] Backtrace aborted due to bad frame pointer <b5417f0c>
[  141.337276] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  141.436887] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  141.537182] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  141.637183] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  141.799644] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  141.899023] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  141.999490] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  142.102101] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  142.202268] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  142.311426] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  142.415091] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  142.514986] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  142.615208] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  142.715273] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  142.812273] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  142.829433] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  142.912513] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  142.929156] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  143.029001] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  143.129194] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  143.229373] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  143.329184] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  143.435061] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  143.797977] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  143.899011] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  144.797451] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  144.798583] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  144.896925] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  144.897909] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  145.797552] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  145.798131] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  145.898174] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  145.899525] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  145.999379] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  146.100739] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  146.215710] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  146.316000] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  146.416862] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  146.517106] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  146.617023] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  146.717211] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  146.801151] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  146.817050] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  146.904209] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  146.921656] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  147.021363] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  147.120916] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  147.221415] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  147.323082] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  147.426444] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  147.526010] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  147.625953] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  147.797146] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  147.902976] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  148.005919] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  148.106918] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  148.206976] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  148.307309] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  148.407140] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  148.511000] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  148.610953] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  148.711486] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  148.797933] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  148.811355] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  148.898014] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  148.911152] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  149.028507] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  149.128246] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  149.228607] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  149.327900] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  149.428286] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  149.528000] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  149.633348] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  149.796876] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  149.896911] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  150.801013] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  150.802726] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  150.902591] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  150.903371] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  151.800499] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  151.811995] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  151.908076] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  151.914694] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  152.015214] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  152.115005] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  152.215451] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  152.315184] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  152.419199] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  152.519287] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  152.619734] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  152.724138] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  152.804956] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  152.824277] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  152.913860] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  152.942502] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  153.042457] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  153.142426] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  153.241987] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  153.341984] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  153.441984] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  153.543299] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  153.643323] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  153.797505] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  153.897004] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  154.002822] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  154.115564] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  154.217421] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  154.317091] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  154.417065] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  154.518514] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  154.634148] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  154.733961] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  154.805816] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  154.834049] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  154.906181] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  154.934081] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  155.033806] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  155.134241] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  155.240601] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  155.339980] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  155.439998] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  155.808189] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  155.908095] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  156.804709] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  156.806216] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  156.917123] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  156.924541] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  157.796924] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  157.801934] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  157.898854] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  157.902181] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  158.003958] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  158.104061] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  158.203977] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  158.303997] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  158.404939] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  158.506374] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  158.607095] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  158.690703] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[  158.708498] FAT-fs (mmcblk0p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[  158.711632] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  158.807424] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  158.813254] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  158.908146] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  158.913555] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  159.013046] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  159.127281] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  159.230640] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  159.330142] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  159.430122] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  159.530144] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  159.630957] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  159.799151] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  159.899632] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  160.002183] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  160.101954] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  160.214021] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  160.314602] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  160.413980] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  160.513957] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  160.614556] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  160.715170] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  160.813640] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  160.823555] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  160.913202] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  160.923094] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  161.023152] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  161.123599] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  161.222979] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  161.331034] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  161.431920] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  161.532940] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  161.633146] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  161.800908] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  161.919275] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  162.801459] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  162.802855] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  162.901108] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  162.903282] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  163.801684] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  163.804900] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  163.901162] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  163.905548] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  164.000935] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  164.101364] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  164.209504] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  164.313983] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  164.413987] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  164.514406] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  164.613983] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  164.722352] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  164.809348] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  164.827390] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  164.910026] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  164.927143] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  165.028134] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  165.129486] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  165.229021] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  165.329255] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  165.428958] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  165.529603] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  165.628977] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  165.799369] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  165.900245] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  166.000063] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  166.104432] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x101c with error -71
[  166.203936] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x101c with error -71
[  166.304199] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1314 with error -71
[  166.407383] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1314 with error -71
[  166.507051] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1318 with error -71
[  166.607245] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1318 with error -71
[  166.707373] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x131c with error -71
[  166.801016] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  166.806879] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x131c with error -71
[  166.901325] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  166.907151] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1320 with error -71
[  167.014052] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1320 with error -71
[  167.119686] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x1324 with error -71
[  167.226132] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x06 failed for offset 0x1324 with error -71
[  167.326514] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  167.425967] ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  167.800953] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
[  167.900981] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71

ifconfig after disconnecting the cards:

24050f0f4175 Link encap:UNSPEC  HWaddr 24-05-0F-0F-41-75-48-C4-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:218085 errors:0 dropped:4408 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:233343987 (222.5 MiB)  TX bytes:0 (0.0 B)

24050f0f4263 Link encap:UNSPEC  HWaddr 24-05-0F-0F-42-63-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:121500 errors:0 dropped:3167 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:129990732 (123.9 MiB)  TX bytes:0 (0.0 B)

24050f0f3eaa Link encap:UNSPEC  HWaddr 24-05-0F-0F-3E-AA-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:123882 errors:0 dropped:5593 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:132543415 (126.4 MiB)  TX bytes:0 (0.0 B)

24050f343c42 Link encap:UNSPEC  HWaddr 24-05-0F-34-3C-42-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:125183 errors:0 dropped:1902 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:133939581 (127.7 MiB)  TX bytes:0 (0.0 B)

24050f77bb14 Link encap:UNSPEC  HWaddr 24-05-0F-77-BB-14-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:214103 errors:0 dropped:485 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:229084007 (218.4 MiB)  TX bytes:0 (0.0 B)

ifconfig about 10 minutes later:

24050f0f4175 Link encap:UNSPEC  HWaddr 24-05-0F-0F-41-75-48-24-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:826537 errors:0 dropped:4408 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:884387627 (843.4 MiB)  TX bytes:0 (0.0 B)

24050f0f4263 Link encap:UNSPEC  HWaddr 24-05-0F-0F-42-63-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:126393 errors:0 dropped:3167 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:135226242 (128.9 MiB)  TX bytes:0 (0.0 B)

24050f0f3eaa Link encap:UNSPEC  HWaddr 24-05-0F-0F-3E-AA-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:128773 errors:0 dropped:5593 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:137776785 (131.3 MiB)  TX bytes:0 (0.0 B)

24050f343c42 Link encap:UNSPEC  HWaddr 24-05-0F-34-3C-42-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:162340 errors:0 dropped:1902 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:173697571 (165.6 MiB)  TX bytes:0 (0.0 B)

24050f77bb14 Link encap:UNSPEC  HWaddr 24-05-0F-77-BB-14-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:822555 errors:0 dropped:485 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:880127647 (839.3 MiB)  TX bytes:0 (0.0 B)

dmesg about 10 minutes later (those messages continue, I assume because that kworker thread is eating 100% cpu?)

[  645.372824] INFO: rcu_sched self-detected stall on CPU
[  645.372879] 	0-...: (524544 ticks this GP) idle=d1b/140000000000002/0 softirq=13086/13086 fqs=173246 
[  645.372892] 	 (t=525038 jiffies g=6857 c=6856 q=100189)
[  645.372913] Task dump for CPU 0:
[  645.372929] kworker/u8:2    R running      0    69      2 0x00000002
[  645.373020] Workqueue: phy2 rt2x00usb_work_rxdone [rt2x00usb]
[  645.373036] Backtrace: 
[  645.373094] [<80012940>] (dump_backtrace) from [<80012b38>] (show_stack+0x18/0x1c)
[  645.373107]  r6:80000193 r5:80539bc0 r4:b619a200 r3:8053988c
[  645.373156] [<80012b20>] (show_stack) from [<8003fd6c>] (sched_show_task+0xac/0x100)
[  645.373188] [<8003fcc0>] (sched_show_task) from [<80041d8c>] (dump_cpu_task+0x40/0x44)
[  645.373199]  r5:80539bc0 r4:00000000
[  645.373239] [<80041d4c>] (dump_cpu_task) from [<80063f94>] (rcu_dump_cpu_stacks+0x94/0xd0)
[  645.373250]  r4:00000001 r3:00000001
[  645.373287] [<80063f00>] (rcu_dump_cpu_stacks) from [<8006794c>] (rcu_check_callbacks+0x494/0x7dc)
[  645.373298]  r8:362cd000 r7:0001875d r6:80539bc0 r5:80530e80 r4:b67fde80 r3:0005451c
[  645.373358] [<800674b8>] (rcu_check_callbacks) from [<8006a480>] (update_process_times+0x40/0x6c)
[  645.373369]  r10:b67fab38 r9:00000096 r8:431cf730 r7:00000096 r6:431cfb41 r5:00000000
[  645.373402]  r4:b619a200
[  645.373436] [<8006a440>] (update_process_times) from [<80079bd8>] (tick_sched_handle+0x50/0x54)
[  645.373448]  r5:b5417a88 r4:b67fac78
[  645.373477] [<80079b88>] (tick_sched_handle) from [<80079c2c>] (tick_sched_timer+0x50/0x94)
[  645.373503] [<80079bdc>] (tick_sched_timer) from [<8006adf8>] (__hrtimer_run_queues+0x114/0x1ac)
[  645.373514]  r7:b67fab00 r6:b67fab0c r5:b67fac78 r4:b67faac0
[  645.373557] [<8006ace4>] (__hrtimer_run_queues) from [<8006b56c>] (hrtimer_interrupt+0xcc/0x228)
[  645.373568]  r10:b67fab38 r9:b67fab58 r8:b67fab78 r7:b67faac0 r6:00000003 r5:b67faad4
[  645.373603]  r4:8052dac0
[  645.373641] [<8006b4a0>] (hrtimer_interrupt) from [<80328808>] (arch_timer_handler_phys+0x38/0x40)
[  645.373653]  r10:b5416010 r9:8052d14c r8:00000011 r7:b6004d40 r6:8054177c r5:b6800600
[  645.373685]  r4:b6005cc0
[  645.373722] [<803287d0>] (arch_timer_handler_phys) from [<800602b0>] (handle_percpu_devid_irq+0x74/0x8c)
[  645.373753] [<8006023c>] (handle_percpu_devid_irq) from [<8005bddc>] (generic_handle_irq+0x2c/0x3c)
[  645.373764]  r8:00000000 r7:00000000 r6:b5417c48 r5:00000000 r4:8052dfbc r3:8006023c
[  645.373814] [<8005bdb0>] (generic_handle_irq) from [<8005c0b4>] (__handle_domain_irq+0x64/0xbc)
[  645.373842] [<8005c050>] (__handle_domain_irq) from [<80010024>] (handle_IRQ+0x24/0x28)
[  645.373852]  r8:b63f9004 r7:b5417abc r6:ffffffff r5:20000113 r4:802c10f4 r3:b5417a88
[  645.373902] [<80010000>] (handle_IRQ) from [<80009450>] (bcm2836_arm_irqchip_handle_irq+0xb0/0xb4)
[  645.373929] [<800093a0>] (bcm2836_arm_irqchip_handle_irq) from [<80013600>] (__irq_svc+0x40/0x54)
[  645.373946] Exception stack(0xb5417a88 to 0xb5417ad0)
[  645.373969] 7a80:                   00000001 a0000193 b600a800 00000000 b56b1480 60000113
[  645.373992] 7aa0: 00000000 ffffffb9 b63f9004 8052d14c b5416010 b5417af4 b54179d8 b5417ad8
[  645.374009] 7ac0: 8003daf0 802c10f4 20000113 ffffffff
[  645.374037] [<802c106c>] (__usb_hcd_giveback_urb) from [<802c11dc>] (usb_hcd_giveback_urb+0x44/0xf4)
[  645.374048]  r7:b5417b50 r6:b56b1480 r5:b56b1480 r4:9a75eac0
[  645.374098] [<802c1198>] (usb_hcd_giveback_urb) from [<802e7430>] (completion_tasklet_func+0x64/0x90)
[  645.374109]  r6:b56b1480 r5:b616e800 r4:9a75eac0 r3:60000113
[  645.374153] [<802e73cc>] (completion_tasklet_func) from [<802f5df8>] (tasklet_callback+0x18/0x1c)
[  645.374164]  r6:80555980 r5:00000000 r4:b63f9000
[  645.374206] [<802f5de0>] (tasklet_callback) from [<8001fbe4>] (tasklet_hi_action+0x88/0x124)
[  645.374232] [<8001fb5c>] (tasklet_hi_action) from [<8001ff34>] (__do_softirq+0x134/0x254)
[  645.374243]  r10:80534080 r9:40000000 r8:00000100 r7:b5416000 r6:80534080 r5:00000000
[  645.374277]  r4:00000001
[  645.374301] [<8001fe00>] (__do_softirq) from [<80020324>] (irq_exit+0xb8/0x120)
[  645.374312]  r10:b2c86a00 r9:b62e7a00 r8:00000000 r7:00000000 r6:00000000 r5:00000000
[  645.374346]  r4:8052dfbc
[  645.374370] [<8002026c>] (irq_exit) from [<8005c0b8>] (__handle_domain_irq+0x68/0xbc)
[  645.374381]  r4:8052dfbc r3:802311a0
[  645.374413] [<8005c050>] (__handle_domain_irq) from [<80010024>] (handle_IRQ+0x24/0x28)
[  645.374424]  r8:b6334800 r7:b5417c7c r6:fffff