openwrt / openwrt/mt76

mt7921au ap mode random crash on openwrt 23.05

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Description

Fri Nov 10 04:11:31 2023 daemon.info hostapd: phy1-ap0: STA 72:bd:41:7c:12:7d IEEE 802.11: authenticated
Fri Nov 10 04:11:31 2023 daemon.info hostapd: phy1-ap0: STA 72:bd:41:7c:12:7d IEEE 802.11: associated (aid 2)
Fri Nov 10 04:11:31 2023 daemon.notice hostapd: phy1-ap0: AP-STA-CONNECTED 72:bd:41:7c:12:7d auth_alg=open
Fri Nov 10 04:12:11 2023 kern.err kernel: [ 417.365011] mt7921u 2-1:1.0: Message 00020002 (seq 6) timeout
Fri Nov 10 04:12:12 2023 kern.err kernel: [ 417.594940] mt7921u 2-1:1.0: timed out waiting for pending tx
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618122] ------------[ cut here ]------------
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618124] WARNING: CPU: 0 PID: 10152 at kthread_park+0x87/0xa0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618161] Modules linked in: xt_FULLCONENAT pppoe ppp_async zstd pppox ppp_mppe ppp_generic mt7921u mt7921_common mt76_usb mt76_connac_lib mt76 mac80211 ipt_REJECT cfg80211 bnx2x amdgpu zstd_decompress zstd_compress xxhash xt_time xt_tcpudp xt_state xt_socket xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_iprange xt_helper xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TPROXY xt_TCPMSS xt_REDIRECT xt_MASQUERADE xt_LOG xt_FLOWOFFLOAD xt_CT ums_usbat ums_sddr55 ums_sddr09 ums_karma ums_jumpshot ums_isd200 ums_freecom ums_datafab ums_cypress ums_alauda tulip tcp_bbr slhc r8168 r8125 pcnet32 nf_tproxy_ipv6 nf_tproxy_ipv4 nf_socket_ipv6 nf_socket_ipv4 nf_reject_ipv4 nf_log_syslog nf_flow_table nf_conntrack_netlink nf_conncount mlx5_core mlx4_en mlx4_core macvlan libcrc32c iptable_raw iptable_nat iptable_mangle iptable_filter ip_tables igc iavf i915 i40e gpu_sched forcedeth e1000e crc_ccitt compat bnx2 alx 8139too 8139cp ntfs3 evdev i2c_dev cryptodev xt_set
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618239] ip_set_list_set ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ipmac ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6table_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_NPT ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ixgbe igbvf e1000 amd_xgbe mdio ip6_tunnel tunnel6 raid10 raid1 raid0 md_mod nls_utf8 nls_iso8859_1 nls_cp437 zram zsmalloc ena crypto_user algif_skcipher algif_rng algif_hash algif_aead af_alg sha512_ssse3 sha512_generic sha1_ssse3 sha1_generic seqiv jitterentropy_rng drbg hmac cmac authencesn authenc arc4 crypto_acompress uas sdhci_pltfm xhci_plat_hcd fsl_mph_dr_of ehci_platform ehci_fsl igb vfat fat exfat button_hotplug tg3 realtek broadcom bcm_phy_lib mii
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618409] CPU: 0 PID: 10152 Comm: kworker/u2:0 Not tainted 5.15.127 #0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618414] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618417] Workqueue: mt76 mt7921_mac_reset_work [mt7921_common]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618445] RIP: 0010:kthread_park+0x87/0xa0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618449] Code: 74 31 31 c0 5b 41 5c 5d c3 cc cc cc cc 0f 0b 4c 8b a3 90 05 00 00 a8 04 74 a8 0f 0b b8 da ff ff ff 5b 41 5c 5d c3 cc cc cc cc <0f> 0b b8 f0 ff ff ff eb d1 0f 0b eb cb 66 66 2e 0f 1f 84 00 00 00
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618451] RSP: 0018:ffffc90000fcfd78 EFLAGS: 00010202
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618454] RAX: 0000000000000004 RBX: ffff888004ea1d00 RCX: ffff888009807ba8
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618455] RDX: 0000000000000001 RSI: 0000000000000202 RDI: ffff888004ea1d00
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618457] RBP: ffffc90000fcfd88 R08: 0000000000003c00 R09: ffff888003f7a268
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618458] R10: 0000000000000000 R11: ffffffff822ae508 R12: ffff888009403000
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618460] R13: 0000000000000000 R14: 0000000000000020 R15: 0000000000000100
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618463] FS: 0000000000000000(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618465] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618468] CR2: 00007f13341f3b7c CR3: 00000000035e2006 CR4: 00000000003706f0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618503] Call Trace:
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618510]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618518] ? show_regs.part.0+0x1e/0x24
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618549] ? show_regs.cold+0x8/0xd
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618551] ? __warn+0x74/0xf0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618569] ? kthread_park+0x87/0xa0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618572] ? report_bug+0x86/0xa0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618593] ? handle_bug+0x38/0x90
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618606] ? exc_invalid_op+0x18/0x70
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618608] ? asm_exc_invalid_op+0x1b/0x20
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618615] ? kthread_park+0x87/0xa0
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618618] mt76u_resume_rx+0x301/0xd60 [mt76_usb]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618626] ? wait_woken+0x60/0x60
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618633] mt7921u_mac_reset+0x69/0x1c0 [mt7921u]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618639] mt7921_mac_reset_work+0x85/0x140 [mt7921_common]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618644] process_one_work+0x1f8/0x360
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618654] worker_thread+0x4e/0x410
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618657] ? process_one_work+0x360/0x360
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618660] kthread+0x128/0x150
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618662] ? set_kthread_struct+0x50/0x50
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618665] ret_from_fork+0x1f/0x30
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618676]
Fri Nov 10 04:12:12 2023 kern.warn kernel: [ 417.618678] ---[ end trace 56a2ce3888ddc6b9 ]---
Fri Nov 10 04:12:12 2023 kern.info kernel: [ 417.759857] mt7921u 2-1:1.0: HW/SW Version: 0x8a108a10, Build Time: 20230526130917a
Fri Nov 10 04:12:12 2023 kern.info kernel: [ 417.759857]
Fri Nov 10 04:12:12 2023 kern.info kernel: [ 417.770990] mt7921u 2-1:1.0: WM Firmware Version: ____010000, Build Time: 20230526130958

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the mt7921_mac_reset_work call trace and the mt7921u_mac_reset and mt76u_resume_rx entry points shown in the report. Reproduce the mt7921u AP-mode failure on OpenWrt 23.05, then verify that the timeout and kernel warning no longer lead to a crash.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
networking, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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