INFO: task syz.6.531:6794 blocked for more than 144 seconds.
      Not tainted 5.15.182-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.531       state:D stack:27552 pid: 6794 ppid:  5316 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 request_wait_answer fs/fuse/dev.c:411 [inline]
 __fuse_request_send fs/fuse/dev.c:430 [inline]
 fuse_simple_request+0x10e7/0x19c0 fs/fuse/dev.c:515
 fuse_flush+0x522/0x720 fs/fuse/file.c:517
 filp_close+0xac/0x150 fs/open.c:1363
 __range_close fs/file.c:694 [inline]
 __close_range+0x208/0x4d0 fs/file.c:749
 __do_sys_close_range fs/open.c:1408 [inline]
 __se_sys_close_range fs/open.c:1405 [inline]
 __x64_sys_close_range+0x76/0x80 fs/open.c:1405
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f17a8354969
RSP: 002b:00007ffe5f65e338 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f17a857dba0 RCX: 00007f17a8354969
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f17a857dba0 R08: 00000000000001b4 R09: 000000195f65e62f
R10: 00000000003ffc28 R11: 0000000000000246 R12: 000000000003eca6
R13: 00007f17a857c080 R14: ffffffffffffffff R15: 00007ffe5f65e450
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11bea0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:4/1272:
2 locks held by getty/3933:
 #0: ffff88814cdd3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900026362e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
3 locks held by kworker/1:9/4600:
1 lock held by syz-executor/8307:
 #0: ffff88806227e0e0 (&type->s_umount_key#32){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:365
5 locks held by syz.7.1093/8882:
2 locks held by syz.4.1108/8934:

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1272 Comm: kworker/u4:4 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4686 [inline]
RIP: 0010:__lock_acquire+0x593/0x7c60 kernel/locking/lockdep.c:4962
Code: 00 83 3d 3f 23 ae 14 00 0f 84 fe 01 00 00 31 db 48 81 c3 b8 00 00 00 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 97 61 00 00 <44> 0f b6 33 48 8b 44 24 58 0f b6 04 10 84 c0 0f 85 a6 61 00 00 41
RSP: 0018:ffffc90004c3f780 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8f97bc78 RCX: ffffffff815bebcb
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff8ff9a1a8
RBP: ffffc90004c3f9d0 R08: dffffc0000000000 R09: fffffbfff1ff3436
R10: fffffbfff1ff3436 R11: 1ffffffff1ff3435 R12: ffff888021f846e0
R13: ffff888021f83b80 R14: 0000000000000000 R15: ffff888021f846c0
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f292dcc9b0e CR3: 0000000072f5c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x32/0x50 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:368 [inline]
 batadv_nc_purge_paths+0xe7/0x3b0 net/batman-adv/network-coding.c:446
 batadv_nc_worker+0x327/0x5c0 net/batman-adv/network-coding.c:726
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>