INFO: task hung in __cgroup_procs_write (2)

Status: auto-obsoleted due to no activity on 2026/04/16 01:44
Subsystems: cgroups
[Documentation on labels]
First crash: 194d, last: 194d
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
481c0a97 repro 💥 INFO: task hung in __cgroup_procs_write (2) 2026/03/06 12:58 2026/03/06 12:58 2026/03/06 12:58 31e9c887 
failed to run ["git" "fetch" "--force" "--tags" "433dfd5a8a5d80bbf0669b14e9ed908911a52dd6" "59e4d31a0470503dc922bad1970fc6a1c7dfd76b"]: exit status 128
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in __cgroup_procs_write cgroups 1 2 749d 767d 0/29 auto-obsoleted due to no activity on 2024/10/08 12:21
linux-5.15 INFO: task hung in __cgroup_procs_write origin:upstream 1 syz, C error 13 45d 308d 0/3 upstream: reported C repro on 2025/09/23 17:05
linux-6.1 INFO: task hung in __cgroup_procs_write origin:upstream 1 syz error 2 199d 229d 0/3 upstream: reported syz repro on 2025/12/11 21:53

Sample crash report:
INFO: task syz-executor:6574 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:6574  tgid:6574  ppid:1      task_flags:0x400140 flags:0x00000001
Call trace:
 __switch_to+0x418/0x87c arch/arm64/kernel/process.c:742 (T)
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1250/0x2a7c kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7017
 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:692
 __mutex_lock kernel/locking/mutex.c:776 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:828
 cgroup_lock include/linux/cgroup.h:394 [inline]
 cgroup_kn_lock_live+0x150/0x230 kernel/cgroup/cgroup.c:1735
 __cgroup_procs_write+0x80/0x2a0 kernel/cgroup/cgroup.c:5370
 cgroup_procs_write+0x34/0x60 kernel/cgroup/cgroup.c:5409
 cgroup_file_write+0x2fc/0x630 kernel/cgroup/cgroup.c:4312

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/16 01:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59e4d31a0470 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in __cgroup_procs_write
* Struck through repros no longer work on HEAD.