syzbot

 sign-in | mailing list | source | docs
🐞 Open [875]
🐞 Fixed [141]
🐞 Invalid [1009]
⬇ Missing Backports [73]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

INFO: task hung in addrconf_dad_work (3)

Status: auto-obsoleted due to no activity on 2025/05/16 13:56
Reported-by: syzbot+d3142864e7bbe9c62a88@syzkaller.appspotmail.com
First crash: 402d, last: 370d
▶ ▼ Similar bugs (15)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in addrconf_dad_work (2) 1 67 511d 717d 0/3 auto-obsoleted due to no activity on 2024/11/26 11:15
android-414 INFO: task hung in addrconf_dad_work 1 1 2438d 2438d 0/1 auto-closed as invalid on 2019/10/25 08:37
upstream INFO: task hung in addrconf_dad_work (5) net 1 C done 1637 1d05h 561d 0/29 upstream: reported C repro on 2024/07/29 15:23
linux-6.6 INFO: task hung in addrconf_dad_work origin:lts-only 1 syz error 2 6d05h 76d 0/2 upstream: reported syz repro on 2025/11/26 06:47
android-49 INFO: task hung in addrconf_dad_work 1 1 2725d 2725d 0/3 auto-closed as invalid on 2019/02/22 20:09
upstream INFO: task hung in addrconf_dad_work (2) net 1 C unreliable error 107 810d 1165d 0/29 closed as invalid on 2023/11/23 17:05
linux-6.1 INFO: task hung in addrconf_dad_work (4) origin:upstream missing-backport 1 syz error 5 44d 257d 0/3 upstream: reported syz repro on 2025/05/29 09:13
linux-6.1 INFO: task hung in addrconf_dad_work 1 2 999d 1030d 0/3 auto-obsoleted due to no activity on 2023/08/26 05:16
upstream INFO: task hung in addrconf_dad_work net 1 C inconclusive inconclusive 468 1511d 2551d 0/29 closed as invalid on 2022/02/08 10:54
linux-5.15 INFO: task hung in addrconf_dad_work origin:upstream 1 C error 131 33d 752d 0/3 upstream: reported C repro on 2024/01/20 08:09
upstream INFO: task hung in addrconf_dad_work (3) net 1 C 185 700d 742d 25/29 fixed on 2024/03/25 23:45
linux-4.19 INFO: task hung in addrconf_dad_work 1 1 2360d 2360d 0/1 auto-closed as invalid on 2019/12/24 18:36
linux-4.19 INFO: task hung in addrconf_dad_work (2) 1 C error 72 1078d 2151d 0/1 upstream: reported C repro on 2020/03/22 17:39
linux-4.14 INFO: task hung in addrconf_dad_work 1 C inconclusive 1 1326d 1932d 0/1 upstream: reported C repro on 2020/10/27 17:48
upstream INFO: task hung in addrconf_dad_work (4) net 1 2632 581d 631d 26/29 fixed on 2024/07/09 19:14

Sample crash report:
INFO: task kworker/0:3:4318 blocked for more than 146 seconds.
      Not tainted 6.1.128-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:23008 pid:4318  ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 addrconf_dad_work+0xcc/0x16b0 net/ipv6/addrconf.c:4134

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/05 13:56 linux-6.1.y 0cbb5f65e52f 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: task hung in addrconf_dad_work
2025/01/04 11:56 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: task hung in addrconf_dad_work
* Struck through repros no longer work on HEAD.