INFO: task syz-executor:8166 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21832 pid:8166  tgid:8166  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 __bch2_fs_stop+0x704/0x900
 generic_shutdown_super+0x135/0x2c0
 bch2_kill_sb+0x41/0x50
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa58198fed7
RSP: 002b:00007ffc319f3808 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa58198fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc319f38c0
RBP: 00007ffc319f38c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc319f4950
R13: 00007fa581a11c05 R14: 000000000002c9d0 R15: 00007ffc319f4990
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888136625918 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30
1 lock held by ksoftirqd/1/23:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5675:
 #0: ffff88802313a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz-executor/8166:
 #0: ffff888106b480e0 (&type->s_umount_key#83){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.5.1204/11920:
 #0: ffff888106b480e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/12083:
1 lock held by syz.0.1459/13208:
 #0: ffff888106b480e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__rcu_read_lock+0x5/0x60
Code: 00 e9 cc fa ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 <65> 48 8b 1c 25 08 d0 a0 92 48 81 c3 44 04 00 00 48 89 d8 48 c1 e8
RSP: 0018:ffffc900000f7a10 EFLAGS: 00000286
RAX: 1ffff110073ee1c8 RBX: ffff888039f70e40 RCX: ffff88801ba85640
RDX: 0000000000000000 RSI: ffffffff8dba996e RDI: ffff88801ba85640
RBP: ffff88811d2c1818 R08: 0000000000000000 R09: ffffffff8b47d982
R10: dffffc0000000000 R11: ffffffff8b47d8b0 R12: dffffc0000000000
R13: ffff888039f70e50 R14: ffff88811a580d80 R15: 0000000000000303
FS:  0000000000000000(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555589f625c8 CR3: 000000011d012000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 batadv_nc_worker+0xcb/0x610
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
