syzbot


INFO: task hung in rtnl_lock

Status: premoderation: reported syz repro on 2025/06/21 03:33
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+4a860304c330d572cd91@syzkaller.appspotmail.com
First crash: 282d, last: 57m
Bug presence (2)
Date Name Commit Repro Result
2025/06/28 lts (merge base) e0e2f7824338 syz [report] INFO: task hung in rtnl_lock
2025/06/28 upstream (ToT) 35e261cd95dd syz [report] INFO: task hung in rtnl_lock
Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in rtnl_lock 1 41 2244d 2345d 0/1 auto-closed as invalid on 2020/06/04 06:12
upstream INFO: task hung in rtnl_lock (2) net 1 1 1491d 1491d 0/29 auto-closed as invalid on 2022/05/28 17:21
linux-5.15 INFO: task hung in rtnl_lock (2) 1 1 810d 810d 0/3 auto-obsoleted due to no activity on 2024/04/18 21:58
linux-4.14 INFO: task hung in rtnl_lock 1 12 2235d 2346d 0/1 auto-closed as invalid on 2020/06/13 20:56
android-49 INFO: task hung in rtnl_lock 1 7 2308d 2347d 0/3 auto-closed as invalid on 2020/04/01 22:32
linux-6.1 INFO: task hung in rtnl_lock 1 7 966d 1089d 0/3 auto-obsoleted due to no activity on 2023/11/14 10:24
linux-6.1 INFO: task hung in rtnl_lock (2) origin:lts-only 1 C inconclusive 408 1d02h 839d 0/3 upstream: reported C repro on 2023/12/11 07:58
upstream INFO: task hung in rtnl_lock (3) net 1 C 128 738d 1090d 25/29 fixed on 2024/03/26 17:39
linux-5.15 INFO: task hung in rtnl_lock (3) origin:upstream 1 C error 311 2d19h 678d 0/3 upstream: reported C repro on 2024/05/20 16:41
upstream INFO: task hung in rtnl_lock net 1 118 2146d 2092d 0/29 auto-closed as invalid on 2020/09/10 12:52
linux-5.15 INFO: task hung in rtnl_lock 1 4 963d 1088d 0/3 auto-obsoleted due to no activity on 2023/11/17 15:29
Last patch testing requests (7)
Created Duration User Patch Repo Result
2025/12/03 04:04 6m retest repro android16-6.12 error
2025/12/03 04:04 4m retest repro android16-6.12 error
2025/12/02 23:51 12m retest repro android16-6.12 error
2025/12/02 23:51 4m retest repro android16-6.12 error
2025/12/02 23:51 12m retest repro android16-6.12 error
2025/12/02 23:51 3m retest repro android16-6.12 error
2025/12/02 23:51 12m retest repro android16-6.12 error

Sample crash report:
INFO: task kworker/u8:2:46 blocked for more than 126 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2    state:D stack:0     pid:46    tgid:46    ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8017
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 addrconf_dad_work+0xce/0x1530 net/ipv6/addrconf.c:4234
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task kworker/u8:3:359 blocked for more than 132 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:0     pid:359   tgid:359   ppid:2      flags:0x00004000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7864
 __schedule_loop kernel/sched/core.c:7945 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7960
 synchronize_rcu_expedited+0x6eb/0x970 kernel/rcu/tree_exp.h:994
 synchronize_net+0x2c/0x40 net/core/dev.c:11387
 dev_deactivate_many+0x6dd/0xbe0 net/sched/sch_generic.c:1380
 dev_deactivate+0x121/0x1c0 net/sched/sch_generic.c:1406

Crashes (4435):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/10 00:13 android16-6.12 0a7d743a2946 176bead5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/02/16 21:40 android16-6.12 f2758f0da7bc 5d52cba5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/02/04 05:08 android16-6.12 a456898cc65b 42b01fab .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/02/03 20:56 android16-6.12 6b31c6eca9a2 6df4c87a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/02/03 00:32 android16-6.12 12691bc9c3f1 d78927dd .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/02/02 12:00 android16-6.12 c13babfee861 018ebef2 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/01/31 03:43 android16-6.12 c13babfee861 c75a2f6e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/10/20 05:21 android16-6.12 55036ffcd617 1c8c8cd8 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/10/13 05:34 android16-6.12 fbb5490cc8c3 ff1712fe .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/09/23 05:54 android16-6.12 3907c0eb526d 0ac7291c .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/09/09 06:36 android16-6.12 7471f5c09c55 d291dd2d .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/07/18 17:50 android16-6.12 2e58e85c038f 88248e14 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/07/09 14:50 android16-6.12 acad0cd51d10 f4e5e155 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2025/06/26 09:23 android16-6.12 22d634eb24e3 26d77996 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/30 05:05 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/30 03:51 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/30 02:03 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 22:29 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 21:25 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 19:31 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 14:58 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 12:41 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 11:12 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 10:07 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 06:59 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 05:37 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 04:16 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 02:58 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 02:31 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/29 00:58 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 23:26 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 21:41 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 20:25 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 19:16 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 17:28 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 15:04 android16-6.12 2dda9e2ebc9a b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 12:34 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 10:22 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 09:20 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 08:20 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 07:12 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/28 02:43 android16-6.12 8986a4ea110a 356bdfc9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 23:39 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 22:29 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 20:31 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 18:41 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 17:32 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 16:57 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 15:51 android16-6.12 0151654f7a9d 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 14:05 android16-6.12 d73a8ddf419e 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 12:50 android16-6.12 d73a8ddf419e 74a13a23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 09:41 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 08:14 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 06:27 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 04:37 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/27 02:57 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/26 20:24 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/26 20:15 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/26 14:09 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/26 11:39 android16-6.12 d73a8ddf419e 766b6434 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/26 07:18 android16-6.12 c27baa2eb103 c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
2026/03/19 05:46 android16-6.12 e34608848261 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in rtnl_lock
* Struck through repros no longer work on HEAD.