INFO: task syz.3.358:9150 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.358       state:D stack:23208 pid:9150  tgid:9148  ppid:8871   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f93ac18ebe9
RSP: 002b:00007f93ad091038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f93ac3c5fa0 RCX: 00007f93ac18ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f93ac3c5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f93ac3c6038 R14: 00007f93ac3c5fa0 R15: 00007ffc0fc929b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:1/51:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000079fbc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888023289240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
2 locks held by getty/5672:
 #0: ffff8880275c80a0 (&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
2 locks held by syz-executor/7832:
1 lock held by syz.3.358/9150:
 #0: ffff88803367a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.1.372/9351:
 #0: ffff88803367a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/9390:
1 lock held by syz-executor/10526:
 #0: ffff8881093de0e0 (&type->s_umount_key#90){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.8.623/11585:
 #0: ffff88803367a0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.1.673/11768:
3 locks held by syz.1.673/11777:

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

NMI backtrace for cpu 1
CPU: 1 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+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: 7832 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:mark_lock+0x96/0x190
Code: 3d d2 33 06 0e 00 75 19 90 48 c7 c7 e3 65 ba 8d 48 c7 c6 c9 b6 a9 8d e8 88 bc e5 ff 90 0f 0b 90 90 90 31 c9 4c 89 fe 4c 89 f7 <b8> 01 00 00 00 85 69 60 74 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 51
RSP: 0018:ffffc90004b6f3b8 EFLAGS: 00000006
RAX: 000000000006b918 RBX: 0000000000000006 RCX: ffffffff934ffc28
RDX: 0000000000000006 RSI: ffff888106bee180 RDI: ffff888106bed640
RBP: 0000000000000040 R08: 0000000000000000 R09: ffffffff824201c4
R10: ffffc90004b6f5a0 R11: fffff5200096dee2 R12: 0000000000000004
R13: 0000000000000003 R14: ffff888106bee180 R15: 0000000000000000
FS:  000055558d0b1500(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 000000010f7b2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __lock_acquire+0x9e2/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock+0x2e/0x40
 writeback_single_inode+0x34/0x6a0
 sync_inode_metadata+0xb9/0x110
 f2fs_write_checkpoint+0xb06/0x1df0
 kill_f2fs_super+0x2c3/0x6c0
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca3678ebe9
Code: Unable to access opcode bytes at 0x7fca3678ebbf.
RSP: 002b:00007ffff29d4578 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fca36811c77 RCX: 00007fca3678ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000010 R08: 00007ffff29d2316 R09: 00007ffff29d5830
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffff29d5830
R13: 00007fca36811c05 R14: 000055558d0b14a8 R15: 00007ffff29d6900
 </TASK>
