INFO: task can't die in pipe_release (2)

Status: auto-closed as invalid on 2021/03/29 10:10
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+0f45bf8c63785914be1e@syzkaller.appspotmail.com
First crash: 2015d, last: 2015d
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task can't die in pipe_release ext4 1 syz 1 2195d 2191d 0/29 closed as dup on 2020/08/07 10:37
linux-6.1 INFO: task hung in pipe_release (2) 1 2 358d 427d 0/3 auto-obsoleted due to no activity on 2025/11/19 23:00
linux-6.6 INFO: task hung in pipe_release 1 1 414d 414d 0/2 auto-obsoleted due to no activity on 2025/09/25 14:36
upstream INFO: task hung in pipe_release (5) fs 1 160 580d 690d 0/29 auto-obsoleted due to no activity on 2025/02/21 02:48
linux-6.1 INFO: task hung in pipe_release 1 2 648d 707d 0/3 auto-obsoleted due to no activity on 2025/02/03 06:35
upstream INFO: task hung in pipe_release (4) fs 1 syz, C done 51 1120d 1120d 23/29 fixed on 2023/10/12 12:48
upstream INFO: task hung in pipe_release (3) fs 1 4 1723d 1837d 0/29 closed as invalid on 2022/02/07 19:19
linux-4.19 INFO: task hung in pipe_release 1 1 1959d 1959d 0/1 auto-closed as invalid on 2021/07/23 11:59
linux-5.15 INFO: task hung in pipe_release 1 2 655d 717d 0/3 auto-obsoleted due to no activity on 2025/01/27 06:00
linux-5.15 INFO: task hung in pipe_release (2) 1 1 497d 497d 0/3 auto-obsoleted due to no activity on 2025/07/04 20:01
upstream INFO: task hung in pipe_release (6) prio:high kernfs 1 syz done 20 59d 524d 2/29 upstream: reported syz repro on 2025/02/27 19:55

Sample crash report:
INFO: task syz-executor.4:16676 can't die for more than 147 seconds.
task:syz-executor.4  state:D stack:29048 pid:16676 ppid:  8473 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4326 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5077
 schedule+0xcf/0x270 kernel/sched/core.c:5156
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5215
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 __pipe_lock fs/pipe.c:87 [inline]
 pipe_release+0x49/0x320 fs/pipe.c:703
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x417b71
RSP: 002b:00007ffc01d8d550 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417b71
RDX: 0000001b2ca20000 RSI: ffffffff8903e45e RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffff8132e020 R09: 000000009ef3fe36
R10: 00007ffc01d8d630 R11: 0000000000000293 R12: 000000000119ca00
R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c0dc
INFO: task syz-executor.4:16676 blocked for more than 151 seconds.
      Not tainted 5.11.0-rc5-next-20210128-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:29048 pid:16676 ppid:  8473 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4326 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5077
 schedule+0xcf/0x270 kernel/sched/core.c:5156
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5215
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 __pipe_lock fs/pipe.c:87 [inline]
 pipe_release+0x49/0x320 fs/pipe.c:703
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x417b71
RSP: 002b:00007ffc01d8d550 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417b71
RDX: 0000001b2ca20000 RSI: ffffffff8903e45e RDI: 0000000000000003
RBP: 0000000000000001 R08: ffffffff8132e020 R09: 000000009ef3fe36
R10: 00007ffc01d8d630 R11: 0000000000000293 R12: 000000000119ca00
R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c0dc

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/28 10:09 linux-next d03154e8bb6a eefc07f2 .config console log report info ci-upstream-linux-next-kasan-gce-root INFO: task can't die in pipe_release
* Struck through repros no longer work on HEAD.