INFO: task syz.2.283:8165 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.283       state:D stack:28000 pid:8165  tgid:8163  ppid:7241   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 super_lock+0x289/0x3d0
 grab_super+0xb9/0x380
 sget_fc+0x2c2/0xa40
 get_tree_bdev_flags+0x214/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c26f9c799
RSP: 002b:00007f2c251d5028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2c27216090 RCX: 00007f2c26f9c799
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 0000200000000180
RBP: 00007f2c27032c99 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080c80e R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c27216128 R14: 00007f2c27216090 R15: 00007ffc83947988
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5635:
 #0: ffff88810bcf20a0 (&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
1 lock held by syz-executor/5739:
 #0: ffff88812103ae60 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
3 locks held by syz-executor/5816:
3 locks held by syz-executor/5825:
3 locks held by syz-executor/6431:
1 lock held by syz.2.283/8165:
 #0: ffff88811a1ea0e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.1.304/8315:
 #0: ffff8881772160e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.450/9696:
 #0: ffff88817557e0e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz.9.538/10578:
 #0: ffff8881b64e6420 (sb_writers#14){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
1 lock held by syz.0.541/10600:
3 locks held by syz.2.540/10602:

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

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+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: 10600 Comm: syz.0.541 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 4e b4 84 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 cf fc ee fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f e9 8a ba 70 06 cc 44 89 f9 80 e1 07
RSP: 0018:ffffc9000714f298 EFLAGS: 00000006
RAX: 1ffffffff34ba505 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc9000714f430 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff8540ed90 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff9a5d2980 R15: 0000000000000000
FS:  00007f8cc3fef6c0(0000) GS:ffff88818de5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005644882abd98 CR3: 000000011a594000 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
 f2fs_printk+0x48a/0x520
 f2fs_apply_options+0x5c2/0x1f00
 f2fs_fill_super+0x2735/0x7740
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8cc319da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8cc3feee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8cc3feeee0 RCX: 00007f8cc319da0a
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007f8cc3feeea0
RBP: 0000200000000000 R08: 00007f8cc3feeee0 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f8cc3feeea0 R14: 0000000000005505 R15: 0000200000005a00
 </TASK>
