INFO: task hung in addrconf_verify_work

Status: auto-closed as invalid on 2020/09/29 04:19
Reported-by: syzbot+69ff42e1524c231dc910@syzkaller.appspotmail.com
First crash: 2395d, last: 2323d
▶ ▼ Similar bugs (27)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in addrconf_verify_work 1 18 2564d 2737d 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 648d 985d 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 1551d 1590d 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 1332d 1391d 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 2038d 2038d 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 1732d 1818d 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 1330d 2174d 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 2554d 2554d 13/29 fixed on 2019/11/04 14:50
linux-4.19 INFO: task hung in addrconf_verify_work (2) 1 2 2178d 2267d 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 831d 873d 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 2554d 2739d 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 823d 1027d 26/29 fixed on 2024/07/09 19:14
android-44 INFO: task hung in addrconf_verify_work 1 3 3071d 3100d 0/2 auto-closed as invalid on 2019/02/22 14:29
upstream INFO: task hung in addrconf_verify_work (10) net prio:normal 1 128 8m 3h44m 0/29 upstream: reported on 2026/10/11 07:02
linux-4.19 INFO: task hung in addrconf_verify_work 1 1 2397d 2397d 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 278d 337d 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 2167d 2202d 15/29 fixed on 2020/11/16 12:12
upstream INFO: task hung in addrconf_verify_work (9) net 1 syz 2352 5d09h 778d 0/29 closed as invalid on 2026/10/06 01:41
upstream INFO: task hung in addrconf_verify_work (5) net 1 syz, C done done 68 1746d 1838d 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 1046d 1193d 0/29 closed as invalid on 2023/12/01 14:19
linux-5.15 INFO: task hung in addrconf_verify_work (2) 1 1 245d 245d 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 1255d 1306d 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 3 28d 125d 0/3 upstream: reported syz repro on 2026/06/07 23:30
upstream INFO: task hung in addrconf_verify_work net 1 syz, C 2 3120d 3120d 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 2059d 2146d 20/29 fixed on 2021/04/09 19:46
upstream INFO: task hung in addrconf_verify_work (6) 1 syz, C done 86 1328d 1565d 22/29 fixed on 2023/02/24 13:51
linux-6.6 INFO: task hung in addrconf_verify_work 1 13 5d14h 295d 0/2 upstream: reported on 2025/12/19 17:57

Sample crash report:
device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_0 left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
INFO: task kworker/0:1:24 blocked for more than 140 seconds.
      Not tainted 4.14.182-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1     D27624    24      2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893
 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4412
 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task kworker/u4:2:31 blocked for more than 140 seconds.
      Not tainted 4.14.182-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:2    D26400    31      2 0x80000000
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893
 kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
 device_del+0x642/0xa80 drivers/base/core.c:2081
 device_unregister drivers/base/core.c:2103 [inline]
 device_destroy+0x86/0xb0 drivers/base/core.c:2661
 macvtap_device_event+0x220/0x360 drivers/net/macvtap.c:187
 notifier_call_chain+0x107/0x1a0 kernel/notifier.c:93
 call_netdevice_notifiers net/core/dev.c:1687 [inline]
 rollback_registered_many+0x694/0xa70 net/core/dev.c:7206
 unregister_netdevice_many.part.0+0x16/0x1d0 net/core/dev.c:8281
 unregister_netdevice_many net/core/dev.c:8280 [inline]
 default_device_exit_batch+0x2dd/0x380 net/core/dev.c:8742
 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:145
 cleanup_net+0x3bb/0x820 net/core/net_namespace.c:484
 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task kworker/1:2:2724 blocked for more than 140 seconds.
      Not tainted 4.14.182-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:2     D26256  2724      2 0x80000000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893
 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task syz-executor.4:17178 blocked for more than 140 seconds.
      Not tainted 4.14.182-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28896 17178   6347 0x80000006
Call Trace:
 context_switch kernel/sched/core.c:2808 [inline]
 __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384
 schedule+0x8d/0x1b0 kernel/sched/core.c:3428
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893
 kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
 kvm_uevent_notify_change.part.0+0x2b9/0x420 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4004
 kvm_uevent_notify_change arch/x86/kvm/../../../virt/kvm/kvm_main.c:3963 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:763 [inline]
 kvm_put_kvm+0x96/0xa90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:806
 kvm_vm_release+0x3f/0x50 arch/x86/kvm/../../../virt/kvm/kvm_main.c:817
 __fput+0x25f/0x7a0 fs/file_table.c:210

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/01 04:18 linux-4.14.y 4f68020fef1c a0331e89 .config console log report ci2-linux-4-14
2020/05/09 14:26 linux-4.14.y d71f695ce745 88cb3e92 .config console log report ci2-linux-4-14
2020/05/01 12:27 linux-4.14.y 050272a0423e 143a10e9 .config console log report ci2-linux-4-14
2020/03/21 07:50 linux-4.14.y 01364dad1d45 aa6c6a55 .config console log report ci2-linux-4-14
* Struck through repros no longer work on HEAD.