INFO: task syz-executor:10462 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:21800 pid:10462 tgid:10462 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: 0033:0x7f435ed8ff57
RSP: 002b:00007ffc2a6380e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f435ed8ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc2a6381a0
RBP: 00007ffc2a6381a0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc2a639230
R13: 00007f435ee11c2d R14: 0000000000045a38 R15: 00007ffc2a639270
 </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
5 locks held by udevd/5299:
2 locks held by getty/5676:
 #0: ffff888104c570a0 (&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 sshd/5792:
1 lock held by syz-executor/10462:
 #0: ffff88811ee780e0 (&type->s_umount_key#121){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.6.1495/13429:
 #0: ffff88811ee780e0 (&type->s_umount_key#121){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/14483:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by syz-executor/14979:
3 locks held by syz.4.1919/15819:
4 locks held by dhcpcd-run-hook/15841:

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 15819 Comm: syz.4.1919 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:__asan_memset+0x2f/0x50
Code: 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00 e8 7e e4 ff ff 84 c0 74 11 4c 89 f7 89 ee 48 89 da 5b <41> 5e 5d e9 69 4e 57 09 31 c0 5b 41 5e 5d e9 0e 0e 5a 09 cc 66 66
RSP: 0018:ffffc90002a7eeb8 EFLAGS: 00000202
RAX: ffffc90002a7f101 RBX: ffffc90002a7f1f2 RCX: ffffffff8b7706e5
RDX: 0000000000000003 RSI: 0000000000000020 RDI: ffffc90002a7f1ef
RBP: 0000000000000020 R08: ffffc90002a7f1f1 R09: 1ffff9200054fe3e
R10: dffffc0000000000 R11: fffff5200054fe3f R12: 0000000000000003
R13: 0000000000000000 R14: ffffc90002a7f1ef R15: 0000000000000003
FS:  00007f5830f856c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005652b21eb950 CR3: 00000000413a6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 widen_string+0x85/0x2a0
 vsnprintf+0x739/0xf00
 sprintf+0xd9/0x120
 info_print_prefix+0x1f3/0x310
 record_print_text+0x154/0x420
 printk_get_next_message+0x26d/0x7b0
 console_flush_all+0x4ca/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 _printk+0xcf/0x120
 f2fs_printk+0x464/0x500
 f2fs_fill_super+0x6d98/0x6ff0
 get_tree_bdev_flags+0x40e/0x4d0
 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: 0033:0x7f58301903ca
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:00007f5830f84e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5830f84ef0 RCX: 00007f58301903ca
RDX: 0000200000000140 RSI: 00002000000001c0 RDI: 00007f5830f84eb0
RBP: 0000200000000140 R08: 00007f5830f84ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000001c0
R13: 00007f5830f84eb0 R14: 000000000000550f R15: 0000200000000200
 </TASK>
