INFO: task syz.2.3:5735 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.3         state:D stack:24328 pid:5735  tgid:5732  ppid:5620   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0xc3/0x2c0
 wait_for_completion+0x2cc/0x5e0
 f2fs_issue_checkpoint+0x3e7/0x790
 __f2fs_ioctl+0x3fcc/0xbd20
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2fe259cdd9
RSP: 002b:00007f2fe3522028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2fe2815fa0 RCX: 00007f2fe259cdd9
RDX: 0000000000000000 RSI: 000000000000f507 RDI: 0000000000000005
RBP: 00007f2fe2632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2fe2816038 R14: 00007f2fe2815fa0 R15: 00007ffc3f4e8688
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u9:0/26:
 #0: ffff88812103aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #1: ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888121026118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30
 #3: ffffffff9a692e80 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580
3 locks held by kworker/u9:1/32:
 #0: ffff888162aaf140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90000a77c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff8881b904e0d8 (&type->s_umount_key#54){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u9:2/483:
 #0: ffff8881000ac940 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900041c7c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
2 locks held by getty/5437:
 #0: ffff8881770480a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by kworker/u8:3/5674:
 #0: ffff88823c63aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #1: ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
1 lock held by syz.2.3/5735:
 #0: ffff8881b904e410 (sb_writers#13){++++}-{0:0}, at: mnt_want_write_file+0x60/0x200
2 locks held by syz.2.3/5762:
 #0: ffff888107853b20 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220
 #1: ffff8881b904e410 (sb_writers#13){++++}-{0:0}, at: freeze_super+0x535/0x1190
2 locks held by f2fs_ckpt-7:2/5750:
3 locks held by syz-executor/7360:
3 locks held by kworker/0:8/8019:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900072ffc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff888176eab250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
1 lock held by syz.2.314/8055:
 #0: ffff8881b904e410 (sb_writers#13){++++}-{0:0}, at: do_syscall_64+0x15f/0xf80
5 locks held by syz.7.348/8449:
1 lock held by modprobe/8461:
2 locks held by dhcpcd/8462:
 #0: ffff8881122b0260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
 #1: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by dhcpcd/8463:
 #0: ffff888106f2c260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
 #1: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
2 locks held by dhcpcd-run-hook/8465:
1 lock held by modprobe/8466:

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

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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 8449 Comm: syz.7.348 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:io_serial_in+0x77/0xc0
Code: e8 ce ff 80 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 1f 3b ec fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 1a 7b 66 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc90003257498 EFLAGS: 00000006
RAX: 1ffffffff34f3f05 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000008ac6 RDI: 0000000000008ac7
RBP: ffffc90003257630 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8544ac00 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff9a79f840 R15: 0000000000000000
FS:  00007fbb651f66c0(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc9ef8de0f0 CR3: 0000000174ed8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0x540/0x1ba0
 console_flush_all+0x718/0xb20
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 __ext4_msg+0x2b9/0x2d0
 ext4_reconfigure+0x16bb/0x2d20
 reconfigure_super+0x227/0x8a0
 path_mount+0xdc5/0x10e0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb66f9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb651f6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbb67215fa0 RCX: 00007fbb66f9cdd9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007fbb67032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000001000021 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb67216038 R14: 00007fbb67215fa0 R15: 00007fff7eba13b8
 </TASK>
