INFO: task syz-executor.4:11039 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:27952 pid:11039 ppid:5141   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5305 [inline]
 __schedule+0x1d23/0x5650 kernel/sched/core.c:6623
 schedule+0xde/0x1a0 kernel/sched/core.c:6699
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6758
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
 eventpoll_release include/linux/eventpoll.h:53 [inline]
 __fput+0x7da/0xa90 fs/file_table.c:312
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 get_signal+0x1c7/0x25b0 kernel/signal.c:2635
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcdc848c0f9
RSP: 002b:00007fcdc9104168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 0000000000005a00 RBX: 00007fcdc85abf80 RCX: 00007fcdc848c0f9
RDX: 000000000000ff2e RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007fcdc84e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcd9671baf R14: 00007fcdc9104300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:11043 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:28000 pid:11043 ppid:5126   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5305 [inline]
 __schedule+0x1d23/0x5650 kernel/sched/core.c:6623
 schedule+0xde/0x1a0 kernel/sched/core.c:6699
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6758
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
 eventpoll_release include/linux/eventpoll.h:53 [inline]
 __fput+0x7da/0xa90 fs/file_table.c:312
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 get_signal+0x1c7/0x25b0 kernel/signal.c:2635
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6ad2c8c0f9
RSP: 002b:00007f6ad398e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 0000000000005600 RBX: 00007f6ad2dabf80 RCX: 00007f6ad2c8c0f9
RDX: 000000000000ff2e RSI: 00000000200000c0 RDI: 0000000000000004
RBP: 00007f6ad2ce7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc912dd2af R14: 00007f6ad398e300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c795830 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8c795530 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
 #0: ffffffff8c796400 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6545
2 locks held by getty/4769:
 #0: ffff88802bf92098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015c02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
1 lock held by syz-executor.4/11039:
 #0: ffff8880756ac068 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
1 lock held by syz-executor.4/11042:
1 lock held by syz-executor.3/11043:
 #0: ffff88802a7a1068 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
1 lock held by syz-executor.3/11044:
1 lock held by syz-executor.4/11183:
 #0: ffff88808de65468 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
2 locks held by syz-executor.4/11186:
1 lock held by syz-executor.3/11184:
 #0: ffff88808de65868 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
1 lock held by syz-executor.3/11185:
1 lock held by syz-executor.3/11261:
 #0: ffff8880ad947868 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
1 lock held by syz-executor.3/11263:
1 lock held by syz-executor.4/11264:
 #0: ffff88807ebd3468 (&ep->mtx){+.+.}-{3:3}, at: eventpoll_release_file+0xe2/0x1d0 fs/eventpoll.c:962
1 lock held by syz-executor.4/11266:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xe16/0x1090 kernel/hung_task.c:379
 kthread+0x33e/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11263 Comm: syz-executor.3 Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:write_comp_data+0x85/0x90 kernel/kcov.c:262
Code: 00 00 4a 8d 34 dd 28 00 00 00 48 39 f2 72 1b 48 83 c7 01 48 89 38 4c 89 44 30 e0 4c 89 4c 30 e8 4c 89 54 30 f0 4a 89 4c d8 20 <c3> 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 8b 0c 24 40 0f b6
RSP: 0018:ffffc90014bd7b48 EFLAGS: 00000297
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff81f8b066
RDX: ffff88807d963a80 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff888022547300 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1015b28f31
R13: ffff8880ad947800 R14: ffff888089bf0280 R15: 0000000000000000
FS:  00007fbb7ee81700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000a2b000 CR3: 00000000a8f9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ep_remove+0x96/0xa50 fs/eventpoll.c:727
 ep_remove_safe fs/eventpoll.c:782 [inline]
 ep_clear_and_put+0x21c/0x3b0 fs/eventpoll.c:815
 ep_eventpoll_release+0x45/0x60 fs/eventpoll.c:831
 __fput+0x27c/0xa90 fs/file_table.c:321
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 get_signal+0x1c7/0x25b0 kernel/signal.c:2635
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbb7e08c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb7ee81168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e9
RAX: 0000000000000000 RBX: 00007fbb7e1ac050 RCX: 00007fbb7e08c0f9
RDX: 0000000000000004 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007fbb7e0e7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff736f408f R14: 00007fbb7ee81300 R15: 0000000000022000
 </TASK>