INFO: task syz.0.994:13498 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.994       state:D stack:25696 pid:13498 tgid:13458 ppid:13017  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write_nested+0x1c6/0x210
 filename_create+0x200/0x370
 filename_mkdirat+0xd2/0x510
 __se_sys_mkdirat+0x35/0x150
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46c399b607
RSP: 002b:00007f46c47f4e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f46c47f4ee0 RCX: 00007f46c399b607
RDX: 00000000000001ff RSI: 0000200000000140 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000140
R13: 00007f46c47f4ea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u9:1/32:
 #0: ffff8881626f1148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90000a77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88811841c0e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff8881188e01c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff888173c5e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by syz.0.994/13460:
2 locks held by syz.0.994/13498:
 #0: ffff88811841c420 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881188e0578 (&type->i_mutex_dir_key#22/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
1 lock held by syz-executor/16323:
 #0: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz-executor/17433:
 #0: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 17433 Comm: syz-executor 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
RIP: 0010:printk_get_next_message+0x700/0x880
Code: dc eb 12 e8 42 0a 21 00 45 31 e4 49 bd 00 00 00 00 00 fc ff df 48 8b 5c 24 48 48 83 c3 08 48 89 d8 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 b5 00 00 00 44 89 23 0f b6 5c 24 1f 66 43 c7 44 2f 1c
RSP: 0018:ffffc900058e7680 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffffc900058e78c8 RCX: ffff88810bf6d7c0
RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000
RBP: ffffc900058e7850 R08: 392e37383420205b R09: 205b5d3430303032
R10: 5b5d343030303239 R11: 205d353354202020 R12: 000000000000001f
R13: dffffc0000000000 R14: 000000000000000f R15: 1ffff92000b1cedc
FS:  00005555613bb500(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c0cff8 CR3: 0000000113d60000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 console_flush_all+0x501/0xb20
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 ocfs2_dismount_volume+0x570/0x900
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f49f8d9d9d7
Code: a2 c7 05 1c fd 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffea852a148 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f49f8e32050 RCX: 00007f49f8d9d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffea852a200
RBP: 00007ffea852a200 R08: 00007ffea852b200 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffea852b290
R13: 00007f49f8e32050 R14: 00000000000770db R15: 00007ffea852b2d0
 </TASK>
