INFO: task syz-executor.3:10215 blocked for more than 143 seconds.
      Not tainted 6.4.0-rc6-next-20230613-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:26640 pid:10215 ppid:9510   flags:0x00000004
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+0x288/0xaa0 fs/file_table.c:321
 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: 0033:0x7f590483e04b
RSP: 002b:00007fff589b74d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f590483e04b
RDX: 0000001b2e120000 RSI: 000000000000fd4c RDI: 0000000000000006
RBP: 00007f59049ad980 R08: 0000000000000000 R09: 0000000088d4a359
R10: 00007fff589e9090 R11: 0000000000000293 R12: 00000000000c1536
R13: 00007fff589b75d0 R14: 00007fff589b75f0 R15: 0000000000000032
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c9a1c30 (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: ffffffff8c9a18f0 (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: ffffffff8c9a2840 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6615
2 locks held by getty/4784:
 #0: ffff88814a804098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xf02/0x13f0 drivers/tty/n_tty.c:2176
1 lock held by syz-executor.3/10215:
 #0: ffff88807e8b0c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88807e8b0c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.3/10217:
1 lock held by syz-executor.3/10302:
 #0: ffff88802b390c68 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88802b390c68 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.3/10303:
1 lock held by syz-executor.3/10353:
 #0: ffff88806dcea468 (&pipe->mutex/1){+.+.}-{3:3}, at: __pipe_lock fs/pipe.c:103 [inline]
 #0: ffff88806dcea468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_release+0x4d/0x310 fs/pipe.c:721
2 locks held by syz-executor.3/10354:

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc6-next-20230613-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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: 5377 Comm: kworker/u4:11 Not tainted 6.4.0-rc6-next-20230613-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:mark_lock.part.0+0x6f/0x1960 kernel/locking/lockdep.c:4644
Code: c7 44 24 48 10 80 65 81 c7 00 f1 f1 f1 f1 c7 40 04 f1 f1 04 f2 c7 40 08 00 f2 f2 f2 c7 40 0c 00 f2 f2 f2 c7 40 14 00 00 00 f3 <c7> 40 18 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 30 01
RSP: 0018:ffffc90005867838 EFLAGS: 00000802
RAX: fffff52000b0cf0e RBX: 1ffff92000b0cf0e RCX: 1ffffffff2313602
RDX: dffffc0000000000 RSI: ffff88802f768b18 RDI: ffff88802f768000
RBP: ffff88802f768b18 R08: 0000000000000000 R09: fffffbfff23083eb
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802f768b18
R13: 0000000000000008 R14: 0000000000000006 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00228f000 CR3: 0000000027c39000 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
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:355 [inline]
 batadv_nc_purge_paths+0xdf/0x3c0 net/batman-adv/network-coding.c:442
 batadv_nc_worker+0x931/0xfe0 net/batman-adv/network-coding.c:722
 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>