BUG: workqueue lockup

Status: upstream: reported C repro on 2023/07/23 17:25
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+64286f251ae123d869a5@syzkaller.appspotmail.com
First crash: 1188d, last: 6h15m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (4)
Date Name Commit Repro Result
2024/10/23 android14-6.1 (ToT) e02772c76d6f C [report] BUG: workqueue lockup
2023/09/10 lts (merge base) b1644a0031cf C [report] BUG: workqueue lockup
2023/09/10 upstream (ToT) 1548b060d6f3 C [report] BUG: workqueue lockup
2024/10/23 upstream (ToT) c2ee9f594da8 C Didn't crash
▶ ▼ Similar bugs (16)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: workqueue lockup (4) block -1 syz, C 47 2465d 2872d 15/29 fixed on 2019/12/13 00:31
linux-5.15 BUG: workqueue lockup missing-backport origin:upstream -1 syz, C done 642 15d 1256d 0/3 upstream: reported C repro on 2023/03/11 08:51
android-5-15 BUG: workqueue lockup origin:upstream missing-backport -1 syz, C error 8367 11h43m 1152d 0/2 upstream: reported C repro on 2023/06/22 22:19
upstream BUG: workqueue lockup (2) -1 syz, C 406 3021d 3180d 5/29 fixed on 2018/05/13 10:02
linux-4.14 BUG: workqueue lockup -1 syz, C 282 1266d 2668d 0/1 upstream: reported C repro on 2019/04/29 11:26
upstream BUG: workqueue lockup -1 syz, C 172 3202d 3213d 3/29 fixed on 2017/11/11 01:37
upstream BUG: workqueue lockup (5) prio:low wireguard arm 1 syz, C done 17383 16m 2407d 0/29 upstream: reported C repro on 2020/01/14 22:04
android-5-10 BUG: workqueue lockup (2) -1 syz, C error 16994 2h20m 1261d 0/2 upstream: reported C repro on 2023/03/05 21:10
upstream BUG: workqueue lockup (3) -1 syz, C 1215 2966d 3018d 8/29 fixed on 2018/07/09 18:05
linux-6.6 BUG: workqueue lockup origin:upstream -1 syz, C error 59 13d 427d 0/2 upstream: reported C repro on 2025/06/17 05:08
android-414 BUG: workqueue lockup -1 syz, C 114 2530d 2686d 0/1 public: reported C repro on 2019/04/11 00:00
linux-4.19 BUG: workqueue lockup -1 syz, C error 41 1260d 2674d 0/1 upstream: reported C repro on 2019/04/22 20:37
android-5-10 BUG: workqueue lockup -1 syz, C error 25 1660d 1759d 0/2 closed as invalid on 2022/02/22 17:18
android-49 BUG: workqueue lockup -1 syz, C 69 2454d 2686d 0/3 public: reported C repro on 2019/04/11 08:44
android-6-12 BUG: workqueue lockup -1 1 396d 396d 0/1 auto-obsoleted due to no activity on 2025/10/16 16:41
linux-6.1 BUG: workqueue lockup origin:upstream missing-backport -1 syz, C unreliable 621 1h41m 1259d 0/3 upstream: reported C repro on 2023/03/07 17:51

Sample crash report:
RBP: 00007f058a470b20 R08: 00007f058a39fcdc R09: 00007f058a39fcdc
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f058a470b2c
R13: 0000000000000000 R14: 00007fff65f56a70 R15: 00007fff65f56b58
 </TASK>
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 234s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 refcnt=3
    pending: vmstat_shepherd, psi_avgs_work
workqueue events_unbound: flags=0x2
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/512 refcnt=4
    pending: toggle_allocation_gate, flush_memcg_stats_dwork
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=4/256 refcnt=5
    pending: neigh_managed_work, neigh_periodic_work, gc_worker, reg_check_chans_work
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 refcnt=4
    pending: neigh_managed_work, neigh_periodic_work, check_lifetime
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: vmstat_update
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: vmstat_update
workqueue writeback: flags=0x4a
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=3
    pending: wb_workfn
workqueue kblockd: flags=0x18
  pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 refcnt=2
    pending: blk_mq_timeout_work
workqueue dm_bufio_cache: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
    pending: work_fn
workqueue ipv6_addrconf: flags=0x40008
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
    pending: addrconf_verify_work

Crashes (7922):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/16 09:34 android14-6.1 92668decd5e0 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 07:07 android14-6.1 92668decd5e0 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/02 08:15 android14-6.1 92668decd5e0 e611ffe1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/29 23:12 android14-6.1 92668decd5e0 6ef5c1e2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/29 20:29 android14-6.1 92668decd5e0 6ef5c1e2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/29 09:02 android14-6.1 92668decd5e0 19622d9d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/18 11:42 android14-6.1 c7e15f0bdc49 72524a66 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/12 03:04 android14-6.1 21b931853e8d d78ea535 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/10 19:30 android14-6.1 52939c41021c 99e64375 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/10 07:44 android14-6.1 52939c41021c 4167ee25 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/09 09:01 android14-6.1 52939c41021c b9f1ceaa .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/07 23:23 android14-6.1 88b53eb10b7d 76cdc0c0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/05 20:15 android14-6.1 cf4093a4ac64 fcece630 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/04 16:38 android14-6.1 cf4093a4ac64 fcece630 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/04 13:57 android14-6.1 cf4093a4ac64 fcece630 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/04 11:26 android14-6.1 cf4093a4ac64 fcece630 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/03 11:25 android14-6.1 cf4093a4ac64 58bf2096 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2024/03/02 15:47 android14-6.1 09ca5740fbbe 25905f5d .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2024/02/29 11:00 android14-6.1 4289e1348ea3 352ab904 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2024/02/29 06:14 android14-6.1 4289e1348ea3 352ab904 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2024/02/28 18:49 android14-6.1 26d7216e1dd5 55d6f11d .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2024/02/23 19:18 android14-6.1 8c0f9174731d 8d446f15 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/10/08 06:01 android14-6.1 1fe248991f96 5e837c76 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/09/17 10:26 android14-6.1 d3212c2dbaba 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/09/14 04:35 android14-6.1 c2ac612610e0 0b6a67ac .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/09/10 19:15 android14-6.1 cd94fe67fd33 6654cf89 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/08/27 05:27 android14-6.1 5ef132d5643b 7ba13a15 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2023/07/23 17:17 android14-6.1 d51e21b39415 27cbe77f .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/17 01:27 android14-6.1 92668decd5e0 746171ee .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 17:47 android14-6.1 92668decd5e0 746171ee .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 01:07 android14-6.1 92668decd5e0 746171ee .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/15 06:58 android14-6.1 92668decd5e0 746171ee .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/12 11:33 android14-6.1 92668decd5e0 f8d35649 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/12 06:38 android14-6.1 92668decd5e0 f8d35649 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 23:45 android14-6.1 92668decd5e0 e4ef95d6 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/26 04:42 android14-6.1 92668decd5e0 492bab15 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/21 14:06 android14-6.1 72b456bf57ad 7c5de9c3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/20 23:08 android14-6.1 72b456bf57ad de6a700d .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/19 03:33 android14-6.1 c7e15f0bdc49 72524a66 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/18 15:36 android14-6.1 c7e15f0bdc49 72524a66 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/17 20:54 android14-6.1 c7e15f0bdc49 8aaff637 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/16 19:35 android14-6.1 8824f345abdb 71b49442 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/13 10:50 android14-6.1 21b931853e8d d78ea535 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/12 15:48 android14-6.1 21b931853e8d d78ea535 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/11 19:38 android14-6.1 21b931853e8d d78ea535 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/11 14:13 android14-6.1 21b931853e8d d78ea535 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/10 13:20 android14-6.1 52939c41021c 4167ee25 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/10 10:25 android14-6.1 52939c41021c 4167ee25 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/09 22:00 android14-6.1 52939c41021c a0c310a3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/05 08:32 android14-6.1 cf4093a4ac64 fcece630 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/07/03 01:57 android14-6.1 cf4093a4ac64 2b70b115 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/18 10:49 android14-6.1 92668decd5e0 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/17 20:37 android14-6.1 92668decd5e0 905244d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/17 06:38 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/17 03:21 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/17 00:12 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 22:26 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 14:57 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 09:13 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/16 05:15 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/15 14:43 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/15 02:38 android14-6.1 92668decd5e0 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/14 12:50 android14-6.1 92668decd5e0 6f9b3e89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/14 10:17 android14-6.1 92668decd5e0 b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/14 06:43 android14-6.1 92668decd5e0 b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/13 14:22 android14-6.1 92668decd5e0 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/13 12:51 android14-6.1 92668decd5e0 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/13 06:22 android14-6.1 92668decd5e0 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/13 00:10 android14-6.1 92668decd5e0 359b2492 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/12 15:50 android14-6.1 92668decd5e0 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/12 13:37 android14-6.1 92668decd5e0 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/12 06:14 android14-6.1 92668decd5e0 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/11 20:37 android14-6.1 92668decd5e0 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/11 13:14 android14-6.1 92668decd5e0 71790083 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/11 09:42 android14-6.1 92668decd5e0 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/11 08:21 android14-6.1 92668decd5e0 508909ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/10 15:08 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/10 09:49 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/09 22:46 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/09 13:32 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/09 09:58 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/09 07:38 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/08 21:36 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/08 20:28 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/08 18:34 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/08 13:17 android14-6.1 92668decd5e0 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 23:01 android14-6.1 92668decd5e0 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 13:07 android14-6.1 92668decd5e0 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 11:00 android14-6.1 92668decd5e0 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 07:37 android14-6.1 92668decd5e0 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 03:58 android14-6.1 92668decd5e0 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 02:41 android14-6.1 92668decd5e0 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/07 01:20 android14-6.1 92668decd5e0 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/06 23:46 android14-6.1 92668decd5e0 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 BUG: workqueue lockup
2026/08/05 09:54 android14-6.1 92668decd5e0 52aa2820 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1-perf BUG: workqueue lockup
2023/07/05 20:16 android14-6.1 f63b2625af7c ba5dba36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1-perf BUG: workqueue lockup
* Struck through repros no longer work on HEAD.