syzbot


INFO: task hung in netlink_dump

Status: upstream: reported on 2024/06/11 10:20
Reported-by: syzbot+e835a964f86584e6f374@syzkaller.appspotmail.com
First crash: 8d09h, last: 2d14h
Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in netlink_dump (2) net 2 844d 845d 0/27 auto-closed as invalid on 2022/05/26 21:32
upstream INFO: task hung in netlink_dump net 1 1015d 1015d 0/27 auto-closed as invalid on 2021/12/07 11:04
linux-6.1 INFO: task hung in netlink_dump 3 110d 129d 0/3 auto-obsoleted due to no activity on 2024/06/09 02:46
upstream INFO: task hung in netlink_dump (3) net 78 128d 286d 0/27 closed as invalid on 2024/02/12 15:10
linux-6.1 INFO: task hung in netlink_dump (2) 1 6d14h 6d14h 0/3 upstream: reported on 2024/06/13 04:37
upstream INFO: task hung in netlink_dump (4) net 72 72d 112d 26/27 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 [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in netlink_dump
* Struck through repros no longer work on HEAD.