INFO: task syz-executor.1:21009 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc6-next-20230615-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:26984 pid:21009 ppid:5060   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5380 [inline]
 __schedule+0x1d15/0x5790 kernel/sched/core.c:6709
 schedule+0xde/0x1a0 kernel/sched/core.c:6785
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6844
 __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+0x289/0xac0 fs/file_table.c:379
 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: 0033:0x7fe09603e12b
RSP: 002b:00007fff46c01cd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fe09603e12b
RDX: 0000001b2f620000 RSI: 0000000000016e7d RDI: 0000000000000006
RBP: 00007fe0961ad980 R08: 0000000000000000 R09: 00000000881268d4
R10: 00007fff46d03090 R11: 0000000000000293 R12: 00000000000e32de
R13: 00007fff46c01dd0 R14: 00007fff46c01df0 R15: 0000000000000032
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c9a1ab0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xe60 kernel/rcu/tasks.h:568
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8c9a1770 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xe60 kernel/rcu/tasks.h:568
1 lock held by khungtaskd/28:
 #0: ffffffff8c9a26c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6615
2 locks held by getty/4789:
 #0: ffff8880215b4098 (&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.1/21009:
 #0: ffff88807ba40c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807ba40c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.1/21012:
1 lock held by syz-executor.1/21091:
 #0: ffff88807ba63c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807ba63c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.1/21092:
1 lock held by syz-executor.1/21143:
 #0: ffff8880972f7868 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff8880972f7868 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.1/21144:

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc6-next-20230615-syzkaller #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:154 [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:379
 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: 12197 Comm: kworker/u4:0 Not tainted 6.4.0-rc6-next-20230615-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:mark_lock.part.0+0x150/0x1960 kernel/locking/lockdep.c:4644
Code: 14 00 00 48 89 e8 48 23 42 60 0f 84 f0 06 00 00 41 ba 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 <48> c7 43 08 00 00 00 00 48 c7 43 14 00 00 00 00 48 8b 84 24 30 01
RSP: 0018:ffffc900167d78b8 EFLAGS: 00000086
RAX: dffffc0000000000 RBX: fffff52002cfaf1e RCX: 1ffffffff23089a0
RDX: ffffffff91844ca0 RSI: 0000000000000008 RDI: ffffffff91844d00
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23085d0
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888023a28b18
R13: 0000000000000009 R14: 0000000000000020 R15: ffff888023a28b38
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000153e08 CR3: 000000002c98f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 mark_lock kernel/locking/lockdep.c:4649 [inline]
 mark_usage kernel/locking/lockdep.c:4606 [inline]
 __lock_acquire+0x8fc/0x5e20 kernel/locking/lockdep.c:5098
 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5761
 rcu_lock_acquire include/linux/rcupdate.h:302 [inline]
 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+0x131/0xfe0 net/batman-adv/network-coding.c:719
 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2594
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2745
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>