INFO: task hung in netlink_dump

Status: auto-obsoleted due to no activity on 2024/09/25 04:53
Reported-by: syzbot+e835a964f86584e6f374@syzkaller.appspotmail.com
First crash: 785d, last: 779d
▶ ▼ Similar bugs (13)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in netlink_dump (5) net 1 123 682d 741d 0/29 auto-obsoleted due to no activity on 2024/12/01 23:22
upstream INFO: task hung in netlink_dump (2) net 1 2 1622d 1622d 0/29 auto-closed as invalid on 2022/05/26 21:32
upstream INFO: task hung in netlink_dump (7) net 1 1 304d 304d 0/29 auto-obsoleted due to no activity on 2026/01/04 01:58
upstream INFO: task hung in netlink_dump net 1 1 1792d 1792d 0/29 auto-closed as invalid on 2021/12/07 11:04
linux-6.1 INFO: task hung in netlink_dump 1 3 888d 906d 0/3 auto-obsoleted due to no activity on 2024/06/09 02:46
upstream INFO: task hung in netlink_dump (3) net 1 78 905d 1063d 0/29 closed as invalid on 2024/02/12 15:10
linux-6.1 INFO: task hung in netlink_dump (3) 1 1 615d 615d 0/3 auto-obsoleted due to no activity on 2025/03/08 04:08
linux-6.1 INFO: task hung in netlink_dump (4) 1 2 448d 487d 0/3 auto-obsoleted due to no activity on 2025/08/22 04:23
linux-6.1 INFO: task hung in netlink_dump (2) 1 1 783d 783d 0/3 auto-obsoleted due to no activity on 2024/09/21 04:37
upstream INFO: task hung in netlink_dump (6) net 1 1 562d 562d 0/29 auto-obsoleted due to no activity on 2025/04/20 06:11
linux-6.6 INFO: task hung in netlink_dump (2) 1 5 19d 109d 0/2 upstream: reported on 2026/04/18 17:22
linux-6.6 INFO: task hung in netlink_dump 1 1 222d 222d 0/2 auto-obsoleted due to no activity on 2026/04/05 05:43
upstream INFO: task hung in netlink_dump (4) net 1 72 849d 889d 25/29 fixed on 2024/04/12 18:02

Sample crash report:
INFO: task dhcpcd:3174 blocked for more than 143 seconds.
      Not tainted 5.15.161-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:20512 pid: 3174 ppid:  3173 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 netlink_dump+0xd0/0xc40 net/netlink/af_netlink.c:2229
 netlink_recvmsg+0x69d/0x1190 net/netlink/af_netlink.c:2007
 ____sys_recvmsg+0x286/0x530
 ___sys_recvmsg+0x1ec/0x690 net/socket.c:2692

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/17 04:53 linux-5.15.y 4878aadf2d15 f429ab00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in netlink_dump
2024/06/11 19:56 linux-5.15.y c61bd26ae81a 4d75f4f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in netlink_dump
2024/06/11 10:19 linux-5.15.y c61bd26ae81a b7d9eb04 .config console log report info ci2-linux-5-15-kasan-arm64 INFO: task hung in netlink_dump
* Struck through repros no longer work on HEAD.