INFO: task syz-executor.3:10139 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.3  state:D stack:24808 pid:10139 ppid:5038   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1873/0x48f0 kernel/sched/core.c:6710
 schedule+0xc3/0x180 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_release+0x51/0x330 fs/pipe.c:721
 __fput+0x3f8/0x950 fs/file_table.c:378
 task_work_run+0x24a/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcddce3e12b
RSP: 002b:00007ffdf6558840 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007fcddce3e12b
RDX: 0000001b2d620000 RSI: 000000000001e5d3 RDI: 0000000000000004
RBP: 00007fcddcfad980 R08: 0000000000000000 R09: 00000000892bc33c
R10: 00007ffdf6579080 R11: 0000000000000293 R12: 000000000009145f
R13: 00007ffdf6558940 R14: 00007ffdf6558960 R15: 0000000000000032
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8d126af0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8d126eb0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:522
1 lock held by khungtaskd/28:
 #0: ffffffff8d126920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/4747:
 #0: ffff888028df3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015902f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b1/0x1db0 drivers/tty/n_tty.c:2176
1 lock held by syz-executor.3/10139:
 #0: ffff88805b9bc868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88805b9bc868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x51/0x330 fs/pipe.c:721
2 locks held by syz-executor.3/10140:
1 lock held by syz-executor.3/10246:
 #0: ffff88801fdbc068 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88801fdbc068 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x51/0x330 fs/pipe.c:721
2 locks held by syz-executor.3/10247:
1 lock held by syz-executor.3/10305:
 #0: ffff8880236b8c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff8880236b8c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x51/0x330 fs/pipe.c:721
2 locks held by syz-executor.3/10306:

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 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+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x187/0x300 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+0xec2/0xf00 kernel/hung_task.c:379
 kthread+0x2b8/0x350 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: 29 Comm: kworker/u4:2 Not tainted 6.4.0-syzkaller-08881-g533925cb7604 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_acquire+0x15c/0x7f70 kernel/locking/lockdep.c:5016
Code: 12 44 90 48 39 02 75 03 45 31 ed 44 89 74 24 30 41 83 fc 01 77 38 44 89 e0 48 8d 5c c2 08 48 89 d8 48 c1 e8 03 42 80 3c 00 00 <74> 1a 48 89 df e8 9a 35 79 00 48 8b 94 24 80 00 00 00 49 b8 00 00
RSP: 0018:ffffc90000a5f760 EFLAGS: 00000046
RAX: 1ffffffff1a24d25 RBX: ffffffff8d126928 RCX: 0000000000000002
RDX: ffffffff8d126920 RSI: 0000000000000000 RDI: ffffffff8d126920
RBP: ffffc90000a5fa28 R08: dffffc0000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1cee6b6 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: ffff888016e51dc0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c006f6f000 CR3: 000000000cf30000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761
 rcu_lock_acquire+0x2e/0x40 include/linux/rcupdate.h:302
 rcu_read_lock include/linux/rcupdate.h:748 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0xc5/0x5c0 net/batman-adv/network-coding.c:719
 process_one_work+0x92c/0x12c0 kernel/workqueue.c:2597
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2748
 kthread+0x2b8/0x350 kernel/kthread.c:389
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>