INFO: task syz-executor:14191 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:14191 tgid:14191 ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 v9fs_evict_inode+0x170/0x320
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 shrink_dcache_for_umount+0xa0/0x170
 generic_shutdown_super+0x67/0x2c0
 kill_anon_super+0x3b/0x70
 v9fs_kill_super+0x4c/0x90
 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: 0033:0x7f24c338ff17
RSP: 002b:00007ffdce0ab8f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f24c3411c05 RCX: 00007f24c338ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdce0ab9b0
RBP: 00007ffdce0ab9b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdce0aca40
R13: 00007f24c3411c05 R14: 00000000000648ee R15: 00007ffdce0aca80
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_trace/32:
 #0: ffffffff8e13ac10 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{4:4}, at: rcu_tasks_one_gp+0xaf9/0xdf0
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/5677:
 #0: ffff888028a8a0a0 (&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/14191:
 #0: ffff88801f9aa0e0 (&type->s_umount_key#96){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.4.3353/14980:
 #0: ffff88801f9aa0e0 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/15460:
 #0: ffff8881283f20e0 (&type->s_umount_key#55){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.1.3559/15479:
 #0: ffff88801f9aa0e0 (&type->s_umount_key#96){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz.7.4427/17781:
 #0: ffff8880290a80e0 (&type->s_umount_key#59/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
 #1: ffffffff8dfe1668 (wq_pool_mutex){+.+.}-{4:4}, at: __alloc_workqueue+0x9eb/0x1b70

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

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: 17781 Comm: syz.7.4427 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
RIP: 0010:io_serial_out+0x7c/0xc0
Code: 38 71 fc 44 89 f9 d3 e5 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 0c a3 d4 fc 41 03 2e 89 d8 89 ea ee <5b> 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 44 89 f9 80 e1 07 38 c1
RSP: 0018:ffffc90006e37150 EFLAGS: 00000002
RAX: 000000000000005b RBX: 000000000000005b RCX: 0000000000000000
RDX: 00000000000003f8 RSI: 000000000005ce6f RDI: 000000000005ce70
RBP: 00000000000003f8 R08: ffff888020618237 R09: 1ffff110040c3046
R10: dffffc0000000000 R11: ffffffff854e7320 R12: dffffc0000000000
R13: ffffffff99af18c1 R14: ffffffff99de64e0 R15: 0000000000000000
FS:  00007fb6f7a2e6c0(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb6f6b733e0 CR3: 00000000379c6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0x1410/0x1ba0
 console_flush_all+0x728/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 _btrfs_printk+0x562/0x5b0
 btrfs_start_pre_rw_mount+0x11f3/0x1bf0
 open_ctree+0x293a/0x3a10
 btrfs_get_tree+0xf55/0x1820
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb6f6b9038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb6f7a2de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb6f7a2def0 RCX: 00007fb6f6b9038a
RDX: 00002000000055c0 RSI: 0000200000000280 RDI: 00007fb6f7a2deb0
RBP: 00002000000055c0 R08: 00007fb6f7a2def0 R09: 0000000002000898
R10: 0000000002000898 R11: 0000000000000246 R12: 0000200000000280
R13: 00007fb6f7a2deb0 R14: 00000000000055ae R15: 0000200000000180
 </TASK>
