Writing to the sdcard hangs suddently

Start by reproducing the dd if=/dev/zero of=/mnt2/test count=1024 bs=1024 hang and inspect the process state in /proc/242/status, /proc/interrupts, and the available dmesg output. The report names no kernel source file or test, so tracing the Raspberry Pi SD-card path is required; done means identifying a reproducible kernel cause and validating that the write no longer hangs.

Hello! I'm using a modified version of noobs for a project and I noticed that sometimes the process that writes to the sdcard hangs indefinitely. This happens an multiple sdcards and multiple devices. The process is a wget | gz | bsdtar. When it hangs, I can log in via ssh and whatever I try to run on the sdcard hangs. I added strace to the image and I get this:

strace dd if=/dev/zero of=/mnt2/test count=1024 bs=1024
execve("/bin/dd", ["dd", "if=/dev/zero", "of=/mnt2/test", "count=1024", "bs=1024"], [/* 20 vars */]) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_UNINITIALIZED, -1, 0) = 0x76fd7000
open("/lib/libc.so.0", O_RDONLY)        = 3
fstat(3, {st_mode=S_IFREG|0755, st_size=298280, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_UNINITIALIZED, -1, 0) = 0x76fd6000
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\20\241\0\0004\0\0\0"..., 4096) = 4096
mmap2(NULL, 348160, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x76f76000
mmap2(0x76f76000, 293688, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x76f76000
mmap2(0x76fc5000, 4832, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x47000) = 0x76fc5000
mmap2(0x76fc7000, 14184, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x76fc7000
close(3)                                = 0
munmap(0x76fd6000, 4096)                = 0
stat("/lib/ld-uClibc.so.0", {st_mode=S_IFREG|0755, st_size=25312, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_UNINITIALIZED, -1, 0) = 0x76fd6000
set_tls(0x76fd6480, 0x76fd6b20, 0x76fd6b28, 0x76fd6480, 0x76fd8f74) = 0
mprotect(0x76fc5000, 4096, PROT_READ)   = 0
mprotect(0x76fd8000, 4096, PROT_READ)   = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
getuid32()                              = 0
brk(0)                                  = 0x1da4000
brk(0x1da5000)                          = 0x1da5000
rt_sigaction(SIGUSR1, {0x5d410, [], SA_RESTORER|SA_RESTART, 0x76f80d74}, NULL, 8) = 0
open("/dev/zero", O_RDONLY|O_LARGEFILE) = 3
dup2(3, 0)                              = 0
close(3)                                = 0
open("/mnt2/test", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666

This is the status:

# cat /proc/242/status
Name:   dd
Umask:  0077
State:  D (disk sleep)
Tgid:   242
Ngid:   0
Pid:    242
PPid:   239
TracerPid:      239
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 32
Groups: 0 10 
VmPeak:     1176 kB
VmSize:     1176 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:       184 kB
VmRSS:       184 kB
RssAnon:              32 kB
RssFile:             152 kB
RssShmem:              0 kB
VmData:       44 kB
VmStk:       132 kB
VmExe:       640 kB
VmLib:       320 kB
VmPTE:         8 kB
VmPMD:         0 kB
VmSwap:        0 kB
Threads:        1
SigQ:   8/1546
SigPnd: 0000000000000000
ShdPnd: 0000000000020002
SigBlk: 0000000000000000
SigIgn: 0000000000000000
SigCgt: 0000000000000200
CapInh: 0000000000000000
CapPrm: 0000003fffffffff
CapEff: 0000003fffffffff
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
Cpus_allowed:   f
Cpus_allowed_list:      0-3
voluntary_ctxt_switches:        59
nonvoluntary_ctxt_switches:     1

I can see no interrupt for mmc0 in /proc/interrupts. It seems someone else reproduced a similar behaviour in my report here https://github.com/raspberrypi/noobs/issues/487. This is all I have from dmesg:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.9.80-rescue-v7 (luca@ubuntu) (gcc version 4.8.4 (Buildroot 2015.02-git-00027-g36c93da) ) #8 SMP PREEMPT Fri Apr 6 11:33:54 CEST 2018
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: div instructions available: patching division code
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt:Machine model: Raspberry Pi 3 Model B Rev 1.2
[    0.000000] cma: Reserved 8 MiB at 0x0c800000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] On node 0 totalpages: 61440
[    0.000000] free_area_init_node: node 0, pgdat 80821ac0, node_mem_map 8d145500
[    0.000000]   Normal zone: 480 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 61440 pages, LIFO batch:15
[    0.000000] percpu: Embedded 12 pages/cpu @8d109000 s25216 r0 d23936 u49152
[    0.000000] pcpu-alloc: s25216 r0 d23936 u49152 alloc=12*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 60960
[    0.000000] Kernel command line: 8250.nr_uarts=0 bcm2708_fb.fbwidth=1280 bcm2708_fb.fbheight=1024 bcm2708_fb.fbdepth=16 bcm2708_fb.fbswap=1 vc_mem.mem_base=0xfa00000 vc_mem.mem_size=0x10000000  quiet ramdisk_size=32768 root=/dev/ram0 init=/init vt.cur_default=1 elevator=deadline loglevel=2
[    0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Memory: 197996K/245760K available (5120K kernel code, 137K rwdata, 880K rodata, 1024K init, 358K bss, 39572K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
    vector  : 0xffff0000 - 0xffff1000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0x8f800000 - 0xff800000   (1792 MB)
    lowmem  : 0x80000000 - 0x8f000000   ( 240 MB)
      .text : 0x80008000 - 0x80600000   (6112 kB)
      .init : 0x80700000 - 0x80800000   (1024 kB)
      .data : 0x80800000 - 0x80822480   ( 138 kB)
       .bss : 0x80824000 - 0x8087db44   ( 359 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000]  Build-time adjustment of leaf fanout to 32.
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] arm_arch_timer: Architected cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000006] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
[    0.000015] Switching to timer-based delay loop, resolution 52ns
[    0.000202] Console: colour dummy device 80x30
[    0.000217] console [tty0] enabled
[    0.000233] Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
[    0.000246] pid_max: default: 32768 minimum: 301
[    0.000342] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000348] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.000950] CPU: Testing write buffer coherency: ok
[    0.001234] CPU0: update cpu_capacity 1024
[    0.001242] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.001267] Setting up static identity map for 0x100000 - 0x100034
[    0.170311] CPU1: update cpu_capacity 1024
[    0.170318] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.240377] CPU2: update cpu_capacity 1024
[    0.240383] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.310458] CPU3: update cpu_capacity 1024
[    0.310464] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.310536] Brought up 4 CPUs
[    0.310544] SMP: Total of 4 processors activated (153.60 BogoMIPS).
[    0.310548] CPU: All CPU(s) started in HYP mode.
[    0.310551] CPU: Virtualization extensions available.
[    0.311360] devtmpfs: initialized
[    0.320955] VFP support v0.3: implementor 41 architecture 3 part 40 variant 3 rev 4
[    0.321189] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.321204] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.321571] pinctrl core: initialized pinctrl subsystem
[    0.321939] NET: Registered protocol family 16
[    0.323857] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.360329] cpuidle: using governor menu
[    0.360762] Serial: AMBA PL011 UART driver
[    0.362229] bcm2835-mbox 3f00b880.mailbox: mailbox enabled
[    0.362637] uart-pl011 3f201000.serial: could not find pctldev for node /soc/gpio@7e200000/uart0_pins, deferring probe
[    0.421175] bcm2835-dma 3f007000.dma: DMA legacy API manager at 8f80d000, dmachans=0x1
[    0.422857] SCSI subsystem initialized
[    0.423075] usbcore: registered new interface driver usbfs
[    0.423123] usbcore: registered new interface driver hub
[    0.423195] usbcore: registered new device driver usb
[    0.430451] raspberrypi-firmware soc:firmware: Attached to firmware from 2018-03-13 18:47
[    0.432005] clocksource: Switched to clocksource arch_sys_counter
[    0.432222] FS-Cache: Loaded
[    0.432392] CacheFiles: Loaded
[    0.442512] NET: Registered protocol family 2
[    0.443109] TCP established hash table entries: 2048 (order: 1, 8192 bytes)
[    0.443143] TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
[    0.443193] TCP: Hash tables configured (established 2048 bind 2048)
[    0.443244] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.443269] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.443420] NET: Registered protocol family 1
[    0.443641] Trying to unpack rootfs image as initramfs...
[    0.443855] rootfs image is not initramfs (junk in compressed archive); looks like an initrd
[    0.532994] Freeing initrd memory: 29464K
[    0.534712] workingset: timestamp_bits=30 max_order=16 bucket_order=0
[    0.542894] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.543178] fuse init (API version 7.26)
[    0.547040] io scheduler noop registered
[    0.547046] io scheduler deadline registered (default)
[    0.547228] io scheduler cfq registered
[    0.552253] BCM2708FB: allocated DMA memory cc910000
[    0.552272] BCM2708FB: allocated DMA channel 0 @ 8f80d000
[    0.571739] Console: switching to colour frame buffer device 160x64
[    0.584248] vc-mem: phys_addr:0x00000000 mem_base=0x0fa00000 mem_size:0x10000000(256 MiB)
[    0.584625] gpiomem-bcm2835 3f200000.gpiomem: Initialised: Registers at 0x3f200000
[    0.595931] brd: module loaded
[    0.603173] loop: module loaded
[    0.603653] libphy: Fixed MDIO Bus: probed
[    0.603860] usbcore: registered new interface driver brcmfmac
[    0.603913] usbcore: registered new interface driver r8152
[    0.603961] usbcore: registered new interface driver lan78xx
[    0.604008] usbcore: registered new interface driver smsc95xx
[    0.604021] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[    0.831948] Core Release: 2.80a
[    0.831956] Setting default values for core params
[    0.831984] Finished setting default values for core params
[    1.032304] Using Buffer DMA mode
[    1.032309] Periodic Transfer Interrupt Enhancement - disabled
[    1.032313] Multiprocessor Interrupt Enhancement - disabled
[    1.032318] OTG VER PARAM: 0, OTG VER FLAG: 0
[    1.032325] Dedicated Tx FIFOs mode
[    1.032606] WARN::dwc_otg_hcd_init:1032: FIQ DMA bounce buffers: virt = 0x8c904000 dma = 0xcc904000 len=9024
[    1.032630] FIQ FSM acceleration enabled for :
Non-periodic Split Transactions
Periodic Split Transactions
High-Speed Isochronous Endpoints
Interrupt/Control Split Transaction hack enabled
[    1.032636] dwc_otg: Microframe scheduler enabled
[    1.032677] WARN::hcd_init_fiq:459: FIQ on core 1 at 0x803f6eb0
[    1.032686] WARN::hcd_init_fiq:460: FIQ ASM at 0x803f71e8 length 36
[    1.032695] WARN::hcd_init_fiq:486: MPHI regs_base at 0x8fb25000
[    1.032736] dwc_otg 3f980000.usb: DWC OTG Controller
[    1.032765] dwc_otg 3f980000.usb: new USB bus registered, assigned bus number 1
[    1.032793] dwc_otg 3f980000.usb: irq 62, io mem 0x00000000
[    1.032835] Init: Port Power? op_state=1
[    1.032839] Init: Power Port (0)
[    1.032997] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[    1.033006] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.033014] usb usb1: Product: DWC OTG Controller
[    1.033021] usb usb1: Manufacturer: Linux 4.9.80-rescue-v7 dwc_otg_hcd
[    1.033028] usb usb1: SerialNumber: 3f980000.usb
[    1.033674] hub 1-0:1.0: USB hub found
[    1.033711] hub 1-0:1.0: 1 port detected
[    1.034215] dwc_otg: FIQ enabled
[    1.034219] dwc_otg: NAK holdoff enabled
[    1.034223] dwc_otg: FIQ split-transaction FSM enabled
[    1.034233] Module dwc_common_port init
[    1.034411] usbcore: registered new interface driver usb-storage
[    1.034758] mousedev: PS/2 mouse device common for all mice
[    1.035655] bcm2835-wdt 3f100000.watchdog: Broadcom BCM2835 watchdog timer
[    1.035898] bcm2835-cpufreq: min=600000 max=1200000
[    1.037637] sdhci: Secure Digital Host Controller Interface driver
[    1.037639] sdhci: Copyright(c) Pierre Ossman
[    1.037766] sdhost-bcm2835 3f202000.sdhost: could not get clk, deferring probe
[    1.039737] mmc-bcm2835 3f300000.mmc: could not get clk, deferring probe
[    1.039782] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.040833] ledtrig-cpu: registered to indicate activity on CPUs
[    1.040925] hidraw: raw HID events driver (C) Jiri Kosina
[    1.041334] usbcore: registered new interface driver usbhid
[    1.041336] usbhid: USB HID core driver
[    1.041714] vchiq: vchiq_init_state: slot_zero = 0x8c980000, is_master = 0
[    1.042770] NET: Registered protocol family 17
[    1.042941] Registering SWP/SWPB emulation handler
[    1.045204] uart-pl011 3f201000.serial: cts_event_workaround enabled
[    1.045233] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
[    1.045849] sdhost: log_buf @ 8c907000 (cc907000)
[    1.122009] mmc0: sdhost-bcm2835 loaded - DMA enabled (>1)
[    1.123976] mmc-bcm2835 3f300000.mmc: mmc_debug:0 mmc_debug2:0
[    1.123980] mmc-bcm2835 3f300000.mmc: DMA channel allocated
[    1.189510] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.192056] mmc0: new high speed SDHC card at address 1234
[    1.192290] mmcblk0: mmc0:1234 SA16G 14.4 GiB
[    1.197558]  mmcblk0: p1 p2 < p5 p6 p7 p8 >
[    1.202283] RAMDISK: squashfs filesystem found at block 0
[    1.202292] RAMDISK: Loading 29463KiB [1 disk] into ram disk... /
[    1.227253] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[    1.227312] /
[    1.228754] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    1.228845] |
[    1.230254] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[    1.230297] |
[    1.232955] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[    1.233040] \
[    1.252141] Indeed it is in host mode hprt0 = 00021501
[    1.262105] -
[    1.288323] random: fast init done
[    1.288334] \
[    1.322369] -
[    1.327776] mmc1: new high speed SDIO card at address 0001
[    1.327777] \
[    1.327874] /
[    1.331488] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43430-sdio.bin failed with error -2
[    1.331499] brcmfmac mmc1:0001:1: Falling back to user helper
[    1.331516] -
[    1.367800] /
[    1.382500] done.
[    1.452081] usb 1-1: new high-speed USB device number 2 using dwc_otg
[    1.452189] Indeed it is in host mode hprt0 = 00001101
[    1.457999] VFS: Mounted root (squashfs filesystem) readonly on device 1:0.
[    1.458349] devtmpfs: mounted
[    1.459193] Freeing unused kernel memory: 1024K
[    1.542998] uart-pl011 3f201000.serial: no DMA platform data
[    1.663789] brcmfmac: Firmware version = wl0: Oct 23 2017 03:55:53 version 7.45.98.38 (r674442 CY) FWID 01-e58d219f
[    1.664415] brcmfmac: brcmf_c_preinit_dcmds: CLM version = API: 12.2 Data: 7.11.15 Compiler: 1.24.2 ClmImport: 1.24.1 Creation: 2014-05-26 10:53:55 Inc Data: 9.10.39 Inc Compiler: 1.29.4 Inc ClmImport: 1.36.3 Creation: 2017-10-23 03:47:14 
[    1.682213] usb 1-1: New USB device found, idVendor=0424, idProduct=9514
[    1.682222] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.682671] hub 1-1:1.0: USB hub found
[    1.682761] hub 1-1:1.0: 5 ports detected
[    2.022021] usb 1-1.1: new high-speed USB device number 3 using dwc_otg
[    2.182139] usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
[    2.182144] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.184556] smsc95xx v1.0.5
[    2.293635] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-3f980000.usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:8b:a1:04
[    2.402013] usb 1-1.2: new low-speed USB device number 4 using dwc_otg
[    2.579907] usb 1-1.2: New USB device found, idVendor=413c, idProduct=2003
[    2.579912] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    2.579916] usb 1-1.2: Product: Dell USB Keyboard
[    2.579920] usb 1-1.2: Manufacturer: Dell
[    2.593736] input: Dell Dell USB Keyboard as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/0003:413C:2003.0001/input/input0
[    2.662432] hid-generic 0003:413C:2003.0001: input,hidraw0: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-3f980000.usb-1.2/input0
[    2.962052] usb 1-1.4: new low-speed USB device number 5 using dwc_otg
[    3.105795] usb 1-1.4: New USB device found, idVendor=1c4f, idProduct=0048
[    3.105803] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    3.105807] usb 1-1.4: Product: Usb Mouse
[    3.105811] usb 1-1.4: Manufacturer: SIGMACHIP
[    3.105893] EXT4-fs (mmcblk0p5): mounted filesystem with ordered data mode. Opts: (null)
[    3.115805] input: SIGMACHIP Usb Mouse as /devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0/0003:1C4F:0048.0002/input/input1
[    3.118748] EXT4-fs (mmcblk0p5): re-mounted. Opts: data=ordered
[    3.125885] EXT4-fs (mmcblk0p5): re-mounted. Opts: data=ordered
[    3.182281] hid-generic 0003:1C4F:0048.0002: input,hidraw1: USB HID v1.10 Mouse [SIGMACHIP Usb Mouse] on usb-3f980000.usb-1.4/input0
[    5.233500] EXT4-fs (mmcblk0p5): mounted filesystem with ordered data mode. Opts: (null)
[    5.373018] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[    6.863495] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0xDDE1
[    6.886543] random: crng init done
[    8.774934] EXT4-fs (mmcblk0p5): re-mounted. Opts: data=ordered
[   11.449557] EXT4-fs (mmcblk0p5): re-mounted. Opts: data=ordered
[   11.574721]  mmcblk0: p1 p2 < p5 p6 p7 p8 >
[   11.718720]  mmcblk0: p1 p2 < p5 p6 p7 p8 >
[   12.806468] EXT4-fs (mmcblk0p5): mounted filesystem with ordered data mode. Opts: (null)
[   19.694824] EXT4-fs (mmcblk0p7): recovery complete
[   19.697769] EXT4-fs (mmcblk0p7): mounted filesystem with ordered data mode. Opts: (null)
[   26.801034] EXT4-fs (mmcblk0p7): mounted filesystem with ordered data mode. Opts: (null)

Rebooting fixes the problem and everything is back to normal. I have never reproduced anything similar in raspbian. Any advice on what I could do to debug further? Thanks!