INFO: task hung in addrconf_verify_work

Status: upstream: reported on 2025/12/19 17:57
Reported-by: syzbot+d9f3e3e4778c146a77fe@syzkaller.appspotmail.com
First crash: 250d, last: 3d22h
▶ ▼ Similar bugs (25)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in addrconf_verify_work 1 18 2520d 2692d 0/3 auto-closed as invalid on 2020/01/31 12:44
linux-6.1 INFO: task hung in addrconf_verify_work (2) 1 46 603d 940d 0/3 auto-obsoleted due to no activity on 2025/04/10 16:42
linux-4.19 INFO: task hung in addrconf_verify_work (5) 1 3 1506d 1545d 0/1 auto-obsoleted due to no activity on 2022/11/10 09:18
linux-4.19 INFO: task hung in addrconf_verify_work (6) 1 syz, C error 4 1287d 1346d 0/1 upstream: reported C repro on 2022/12/19 15:22
linux-4.19 INFO: task hung in addrconf_verify_work (3) 1 1 1993d 1993d 0/1 auto-closed as invalid on 2021/07/11 07:19
linux-4.19 INFO: task hung in addrconf_verify_work (4) 1 6 1687d 1773d 0/1 auto-closed as invalid on 2022/05/13 00:19
linux-4.14 INFO: task hung in addrconf_verify_work (2) 1 syz, C error 7 1285d 2129d 0/1 upstream: reported C repro on 2020/10/28 05:47
upstream INFO: task hung in addrconf_verify_work (2) net 1 syz, C 22 2509d 2509d 13/29 fixed on 2019/11/04 14:50
linux-4.19 INFO: task hung in addrconf_verify_work (2) 1 2 2133d 2222d 0/1 auto-closed as invalid on 2021/02/21 08:05
linux-5.15 INFO: task hung in addrconf_verify_work missing-backport 1 syz, C done 53 786d 828d 0/3 auto-obsoleted due to no activity on 2024/10/23 03:15
android-414 INFO: task hung in addrconf_verify_work 1 syz, C 6 2509d 2694d 0/1 public: reported C repro on 2019/04/12 00:01
upstream INFO: task hung in addrconf_verify_work (8) net 1 syz, C error 1294 778d 983d 26/29 fixed on 2024/07/09 19:14
android-44 INFO: task hung in addrconf_verify_work 1 3 3026d 3055d 0/2 auto-closed as invalid on 2019/02/22 14:29
linux-4.19 INFO: task hung in addrconf_verify_work 1 1 2352d 2352d 0/1 auto-closed as invalid on 2020/07/16 23:17
linux-6.1 INFO: task hung in addrconf_verify_work (3) 1 3 233d 292d 0/3 auto-obsoleted due to no activity on 2026/04/16 07:08
upstream INFO: task hung in addrconf_verify_work (3) 1 syz, C done 75 2123d 2157d 15/29 fixed on 2020/11/16 12:12
upstream INFO: task hung in addrconf_verify_work (5) net 1 syz, C done done 68 1701d 1793d 0/29 closed as invalid on 2022/02/01 17:39
upstream INFO: task hung in addrconf_verify_work (7) netfilter 1 syz, C error 64 1001d 1148d 0/29 closed as invalid on 2023/12/01 14:19
linux-5.15 INFO: task hung in addrconf_verify_work (2) 1 1 200d 200d 0/3 auto-obsoleted due to no activity on 2026/05/18 23:02
linux-6.1 INFO: task hung in addrconf_verify_work 1 2 1210d 1261d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:09
linux-6.1 INFO: task hung in addrconf_verify_work (4) 1 syz error 1 80d 80d 0/3 upstream: reported syz repro on 2026/06/07 23:30
linux-4.14 INFO: task hung in addrconf_verify_work 1 4 2278d 2350d 0/1 auto-closed as invalid on 2020/09/29 04:19
upstream INFO: task hung in addrconf_verify_work net 1 syz, C 2 3075d 3075d 0/29 closed as invalid on 2018/03/27 11:14
upstream INFO: task hung in addrconf_verify_work (4) 1 syz, C done 132 2014d 2101d 20/29 fixed on 2021/04/09 19:46
upstream INFO: task hung in addrconf_verify_work (6) 1 syz, C done 86 1283d 1520d 22/29 fixed on 2023/02/24 13:51

Sample crash report:
INFO: task kworker/u4:4:60 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:4    state:D stack:21000 pid:60    ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6834
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
 addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4730
 process_one_work kernel/workqueue.c:2657 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/23 16:23 linux-6.6.y dc6160265ffc 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in addrconf_verify_work
2026/08/21 08:13 linux-6.6.y c610b395b0a5 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2026/07/28 19:29 linux-6.6.y c5596480c50e edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2026/06/13 11:24 linux-6.6.y 924b4a879cbb 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2026/05/21 22:24 linux-6.6.y eac8889a3a1c e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2026/04/22 22:47 linux-6.6.y 9760bf04666d b10da5ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in addrconf_verify_work
2026/04/21 16:50 linux-6.6.y 9760bf04666d 0b6ab7ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in addrconf_verify_work
2026/03/10 02:18 linux-6.6.y 4fc00fe35d46 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in addrconf_verify_work
2026/02/13 03:16 linux-6.6.y 1b4ef5214f17 504cb1bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2026/02/04 16:44 linux-6.6.y 2cf6f68313dc ea10c935 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
2025/12/19 17:57 linux-6.6.y 5fa4793a2d2d d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in addrconf_verify_work
* Struck through repros no longer work on HEAD.