INFO: task syz-executor:29187 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21832 pid:29187 tgid:29187 ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 kthread_stop+0x194/0x5c0
 bch2_copygc_stop+0x4b/0x120
 __bch2_fs_read_only+0x47/0x5b0
 bch2_fs_read_only+0x42a/0xb00
 __bch2_fs_stop+0x100/0x900
 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: 0033:0x7fa6c2f8ff17
RSP: 002b:00007fff89874238 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fa6c3011c05 RCX: 00007fa6c2f8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff898742f0
RBP: 00007fff898742f0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff89875380
R13: 00007fa6c3011c05 R14: 0000000000140373 R15: 00007fff898753c0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5674:
 #0: ffff888109bf40a0 (&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
2 locks held by kworker/1:4/5998:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004befbc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by syz-executor/29187:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888123a00278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
2 locks held by syz-executor/31024:
 #0: ffff88803bfca0e0 (&type->s_umount_key#80){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888073200278 (&c->state_lock){++++}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
1 lock held by syz.8.8206/32164:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.8206/32165:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.8.8206/32166:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.0.8288/32427:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.8467/550:
 #0: ffff8881211a40e0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
5 locks held by syz.6.8504/752:
 #0: ffff8880655bcdc0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x510
 #1: ffff8880655bc0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x66a/0x1330
 #2: ffffffff8f6991c8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xa1/0x230
 #3: ffff88813384b338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x70/0x680
 #4: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz.2.8508/759:
 #0: ffffffff8e13f978 (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 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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+0x3fc/0x770
 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: 12 Comm: kworker/u8:0 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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_is_watching+0x51/0xb0
Code: 8d 34 dd 10 bd bd 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 8c b8 7c 00 48 c7 c3 98 ef a0 92 49 03 1e 48 89 d8 <48> c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 49 62 f9 10
RSP: 0018:ffffc900000f78a0 EFLAGS: 00000083
RAX: ffff88804b032f98 RBX: ffff88804b032f98 RCX: 7941158430a2ca00
RDX: 0000000000000000 RSI: ffffffff8be325e0 RDI: ffffffff8be325a0
RBP: ffffc900000f7978 R08: ffffffff8fa34237 R09: 1ffffffff1f46846
R10: dffffc0000000000 R11: fffffbfff1f46847 R12: ffffffff8b469198
R13: dffffc0000000000 R14: ffffffff8dbdbd10 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a8c7b6f5c8 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 trace_irq_enable+0x37/0x110
 trace_hardirqs_on+0x18/0x40
 __local_bh_enable_ip+0x12d/0x1c0
 batadv_nc_purge_paths+0x318/0x3b0
 batadv_nc_worker+0x328/0x610
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
