INFO: task syz-executor.2:9577 blocked for more than 143 seconds.
      Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:26992 pid:9577  ppid:5042   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6710
 schedule+0xde/0x1a0 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_release+0x4d/0x310 fs/pipe.c:721
 __fput+0x40c/0xad0 fs/file_table.c:378
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x210/0x240 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: 0033:0x7f0f47a3e12b
RSP: 002b:00007fff98824770 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f0f47a3e12b
RDX: 0000001b2db20000 RSI: 0000000000017884 RDI: 0000000000000004
RBP: 00007f0f47bad980 R08: 0000000000000000 R09: 0000000088118efa
R10: 00007fff988a0090 R11: 0000000000000293 R12: 0000000000083d67
R13: 00007fff98824870 R14: 00007fff98824890 R15: 0000000000000032
 </TASK>
INFO: task syz-executor.2:9580 blocked for more than 143 seconds.
      Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:27144 pid:9580  ppid:5042   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xc9a/0x5880 kernel/sched/core.c:6710
 schedule+0xde/0x1a0 kernel/sched/core.c:6786
 __lock_sock+0x141/0x260 net/core/sock.c:2946
 lock_sock_nested+0xda/0xf0 net/core/sock.c:3497
 lock_sock include/net/sock.h:1708 [inline]
 udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:748
 ____sys_sendmsg+0x34a/0x920 net/socket.c:2494
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2548
 __sys_sendmmsg+0x18f/0x460 net/socket.c:2634
 __do_sys_sendmmsg net/socket.c:2663 [inline]
 __se_sys_sendmmsg net/socket.c:2660 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2660
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0f47a8c389
RSP: 002b:00007f0f487a5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f0f47babf80 RCX: 00007f0f47a8c389
RDX: 04000000000003bd RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00007f0f47ad7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff9882470f R14: 00007f0f487a5300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c9a1af0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8c9a17f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/27:
 #0: ffffffff8c9a2700 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615
2 locks held by kworker/u4:5/3118:
2 locks held by getty/4754:
 #0: ffff88814aa5c098 (&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+0xf02/0x13f0 drivers/tty/n_tty.c:2176
1 lock held by syz-executor.2/9577:
 #0: ffff888018f85868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff888018f85868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
1 lock held by syz-executor.2/9580:
 #0: ffff88802a711e30 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1708 [inline]
 #0: ffff88802a711e30 (sk_lock-AF_INET){+.+.}-{0:0}, at: udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
2 locks held by syz-executor.2/9581:
1 lock held by syz-executor.2/9657:
 #0: ffff88807dcf7868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807dcf7868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.2/9658:
1 lock held by syz-executor.2/9705:
 #0: ffff88807bef7068 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807bef7068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.2/9706:

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xe16/0x1090 kernel/hung_task.c:379
 kthread+0x344/0x440 kernel/kthread.c:389
 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: 4418 Comm: kworker/0:3 Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0