INFO: task syz-executor.1:12227 blocked for more than 144 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.1  state:D stack:27488 pid:12227 ppid:6330   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: 0033:0x7fc54d63e12b
RSP: 002b:00007ffce83f6a40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fc54d63e12b
RDX: 0000001b2ee20000 RSI: 000000000000e5c9 RDI: 0000000000000004
RBP: 00007fc54d7ad980 R08: 0000000000000000 R09: 000000008810e823
R10: 00007ffce83fa090 R11: 0000000000000293 R12: 000000000011ce04
R13: 00007ffce83f6b40 R14: 00007ffce83f6b60 R15: 0000000000000032
 </TASK>
INFO: task syz-executor.1:12229 blocked for more than 145 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.1  state:D stack:26232 pid:12229 ppid:6330   flags:0x00004006
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: 0033:0x7fc54d68c389
RSP: 002b:00007fc54e330168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fc54d7abf80 RCX: 00007fc54d68c389
RDX: 04000000000003bd RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00007fc54d6d7493 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce83f69df R14: 00007fc54e330300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c79eab0 (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: ffffffff8c79e7b0 (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: ffffffff8c79f6c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615
2 locks held by getty/4758:
 #0: ffff88814a4b1098 (&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
2 locks held by kworker/u4:12/8648:
1 lock held by syz-executor.1/12227:
 #0: ffff88807a7c1468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807a7c1468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
1 lock held by syz-executor.1/12229:
 #0: ffff88807c205f70 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1708 [inline]
 #0: ffff88807c205f70 (sk_lock-AF_INET){+.+.}-{0:0}, at: udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
2 locks held by syz-executor.1/12236:
1 lock held by syz-executor.2/12287:
 #0: ffff88802d095868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88802d095868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
1 lock held by syz-executor.2/12290:
 #0: ffff88807c2049b0 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1708 [inline]
 #0: ffff88807c2049b0 (sk_lock-AF_INET){+.+.}-{0:0}, at: udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
2 locks held by syz-executor.2/12295:
1 lock held by syz-executor.5/12288:
 #0: ffff888079cbe868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff888079cbe868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
1 lock held by syz-executor.5/12289:
 #0: ffff88807aacd0f0 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1708 [inline]
 #0: ffff88807aacd0f0 (sk_lock-AF_INET){+.+.}-{0:0}, at: udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
2 locks held by syz-executor.5/12296:
1 lock held by syz-executor.1/12311:
 #0: ffff88802b71d468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88802b71d468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.1/12312:
1 lock held by syz-executor.1/12401:
 #0: ffff888037b5f868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff888037b5f868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
1 lock held by syz-executor.1/12403:
 #0: ffff88807c2050f0 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1708 [inline]
 #0: ffff88807c2050f0 (sk_lock-AF_INET){+.+.}-{0:0}, at: udp_sendmsg+0x76b/0x2840 net/ipv4/udp.c:1092
2 locks held by syz-executor.1/12404:
1 lock held by syz-executor.2/12409:
 #0: ffff888078c56c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff888078c56c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
4 locks held by syz-executor.2/12410:
1 lock held by syz-executor.5/12411:
 #0: ffff888022c98468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff888022c98468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.5/12412:

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12410 Comm: syz-executor.2 Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:skb_splice_from_iter+0x491/0xd70 net/core/skbuff.c:6793
Code: 24 10 48 89 de e8 7f eb 72 f9 48 85 db 4c 0f 45 eb 4c 89 6c 24 10 e8 2e ef 72 f9 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 50 <48> c7 00 00 00 00 00 c7 40 08 00 00 00 00 c7 40 14 00 00 00 00 48
RSP: 0018:ffffc90003def398 EFLAGS: 00000286
RAX: fffff520007bde81 RBX: 0000000000000000 RCX: ffffc90018414000
RDX: 0000000000040000 RSI: ffffffff8810e9e2 RDI: ffff888088aa65e0
RBP: 000000000000001c R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000094001 R12: 0000000000000004
R13: dffffc0000000000 R14: ffff888088aa6500 R15: ffffc90003defb00
FS:  00007fe3d27b0700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0072d1000 CR3: 0000000031fa2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __ip_append_data+0x1462/0x3c90 net/ipv4/ip_output.c:1212
 ip_append_data net/ipv4/ip_output.c:1352 [inline]
 ip_append_data+0x115/0x1a0 net/ipv4/ip_output.c:1331
 udp_sendmsg+0x881/0x2840 net/ipv4/udp.c:1287
 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
 splice_to_socket+0x964/0xee0 fs/splice.c:882
 do_splice_from fs/splice.c:934 [inline]
 do_splice+0xb8a/0x1ec0 fs/splice.c:1295
 __do_splice+0x14e/0x270 fs/splice.c:1373
 __do_sys_splice fs/splice.c:1584 [inline]
 __se_sys_splice fs/splice.c:1566 [inline]
 __x64_sys_splice+0x19c/0x250 fs/splice.c:1566
 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: 0033:0x7fe3d1a8c389
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:00007fe3d27b0168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007fe3d1babf80 RCX: 00007fe3d1a8c389
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007fe3d1ad7493 R08: 000000000004ffe0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0a4879ef R14: 00007fe3d27b0300 R15: 0000000000022000
 </TASK>