INFO: task syz-executor:14599 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:18104 pid:14599 tgid:14599 ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 __writeback_inodes_sb_nr+0x1f6/0x250
 sync_filesystem+0xa3/0x230
 generic_shutdown_super+0x6f/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: 0033:0x7f18e518ff17
RSP: 002b:00007fffafc130a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f18e5211c05 RCX: 00007f18e518ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffafc13160
RBP: 00007fffafc13160 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffafc141f0
R13: 00007f18e5211c05 R14: 000000000009e129 R15: 00007fffafc14230
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u9:0/26:
 #0: ffff88810129e948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900001efbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u9:4/3581:
 #0: ffff88810129e948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900038ffbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
2 locks held by getty/5673:
 #0: ffff888020b8d0a0 (&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/14599:
 #0: ffff88811db5c0e0 (&type->s_umount_key#111){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz-executor/21344:
 #0: ffff888106c640e0 (&type->s_umount_key#111){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.5.4372/24856:
 #0: ffff88811db5c0e0 (&type->s_umount_key#111){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
3 locks held by syz.2.4437/25081:
2 locks held by syz.7.4438/25083:

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

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: 25083 Comm: syz.7.4438 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:lockdep_hardirqs_on+0x6e/0x150
Code: c0 75 7b 65 8b 05 3a 64 27 07 85 c0 75 70 83 3d 57 7a 32 0e 00 75 32 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <75> 6e 83 3d 39 7a 32 0e 00 75 14 48 8b 83 c8 0a 00 00 48 3b 83 e0
RSP: 0018:ffffc900040af708 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88802f87b980 RCX: 47fcc72285a90e00
RDX: 0000000000000006 RSI: ffffffff8dba33cb RDI: ffffffff8b7b2f53
RBP: ffffc900040af870 R08: ffffffff8fa34237 R09: 1ffffffff1f46846
R10: dffffc0000000000 R11: fffffbfff1f46847 R12: ffffc900040af7c0
R13: 00000003fffffffc R14: 0000000000000000 R15: ffff8880302e4b00
FS:  00007f8bea46f6c0(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8be01ff000 CR3: 000000002db92000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _raw_spin_unlock_irq+0x23/0x50
 shmem_add_to_page_cache+0x8ee/0xba0
 shmem_alloc_and_add_folio+0x846/0xf60
 shmem_get_folio_gfp+0x59d/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8be958d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f8bea46edf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007f8be958d69f
RDX: 0000000001000000 RSI: 00007f8bdf200000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000060ba
R10: 0000000000000772 R11: 0000000000000293 R12: 0000000000000003
R13: 00007f8bea46eef0 R14: 00007f8bea46eeb0 R15: 00007f8bdf200000
 </TASK>
