INFO: task syz-executor:5847 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:5847  tgid:5847  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: 0033:0x7f9226b8fed7
RSP: 002b:00007fff74e06868 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f9226b8fed7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff74e06920
RBP: 00007fff74e06920 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff74e079b0
R13: 00007f9226c11c05 R14: 000000000001986d R15: 00007fff74e079f0
 </TASK>

Showing all locks held in the system:
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: ffff888110b2d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz-executor/5847:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.7.547/8285:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.554/8326:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.2.636/8803:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.725/9217:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.822/9899:
 #0: ffff8880307b60e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/10139:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
2 locks held by syz.5.925/10624:
2 locks held by dhcpcd/10626:
 #0: ffff888112612258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0
 #1: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5860 Comm: kworker/u8:2 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:batadv_nc_worker+0xbb/0x610
Code: 48 89 d8 48 c1 e8 03 48 89 44 24 18 48 89 5c 24 08 4c 89 6c 24 10 48 8b 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 d5 56 db f6 <4a> 8d 2c fd 00 00 00 00 48 03 2b e8 45 50 5f f6 4c 8d 2d 00 00 00
RSP: 0018:ffffc900041afa20 EFLAGS: 00000246
RAX: 1ffff1102396b8e0 RBX: ffff88811cb5c700 RCX: ffff88801e6b1cc0
RDX: 0000000000000000 RSI: ffffffff8dba93b2 RDI: ffff88801e6b1cc0
RBP: fffffffffffffe38 R08: 0000000000000000 R09: ffffffff8b47d942
R10: dffffc0000000000 R11: ffffffff8b47d870 R12: dffffc0000000000
R13: ffff88811cb5c710 R14: ffff8881258d0d80 R15: 0000000000000013
FS:  0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555f017608 CR3: 0000000027718000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
