INFO: task hung in xfrmi_exit_batch

INFO: task hung in xfrmi_exit_batch_net

Status: upstream: reported on 2025/12/09 22:00
Reported-by: syzbot+209d83b1e6b5a9499752@syzkaller.appspotmail.com
First crash: 48d, last: 48d

▶ ▼ Similar bugs (3)

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
linux-6.1	INFO: task hung in xfrmi_exit_batch_net	1	2	598d	601d	0/3	auto-obsoleted due to no activity on 2024/09/16 00:27
upstream	INFO: task hung in xfrmi_exit_batch_net (2) net	1	1	1167d	1167d	0/29	auto-obsoleted due to no activity on 2023/01/17 01:29
upstream	INFO: task hung in xfrmi_exit_batch_net net	1	1	1559d	1559d	0/29	auto-closed as invalid on 2022/01/18 03:55

Sample crash report:

INFO: task kworker/u4:8:1107 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8    state:D stack:21320 pid:1107  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
 schedule+0xbd/0x170 kernel/sched/core.c:6773
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
 xfrmi_exit_batch_net+0xb4/0x350 net/xfrm/xfrm_interface_core.c:960

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/12/09 21:59	linux-6.6.y	5fa4793a2d2d	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-6-6-kasan-perf	INFO: task hung in xfrmi_exit_batch_net

* ~~Struck through~~ repros no longer work on HEAD.