INFO: task can't die in pipe

INFO: task can't die in pipe_release (2)
Status: moderation: reported on 2021/02/01 10:16
Reported-by: syzbot+0f45bf8c63785914be1e@syzkaller.appspotmail.com
First crash: 31d, last: 31d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task can't die in pipe_release	syz			1	211d	207d	0/21	closed as dup on 2020/08/07 10:37

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):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-linux-next-kasan-gce-root	2021/01/28 10:09	linux-next	d03154e8	eefc07f2	.config	log	report			info	INFO: task can't die in pipe_release