INFO: task syz.3.1139:11821 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1139      state:D stack:23576 pid:11821 tgid:11783 ppid:11580  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14bc/0x5000
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 sync_bdevs+0x27e/0x470
 ksys_sync+0xb9/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f68e678f7c9
RSP: 002b:00007f68e76b2038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f68e69e6180 RCX: 00007f68e678f7c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f68e69e6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f68e69e6218 R14: 00007f68e69e6180 R15: 00007fff21c97058
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8df419a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5665:
 #0: ffff888174c7e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
1 lock held by udevd/5972:
 #0: ffff88810ae08358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.3.1139/11821:
 #0: ffff88810ae08358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x27e/0x470
2 locks held by syz.0.1620/14098:
 #0: ffff88819fdba0e0 (&type->s_umount_key#50/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xaa0
 #1: ffff88810ae08358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by syz.1.1828/15024:
1 lock held by syz.2.1829/15030:
2 locks held by syz.2.1829/15032:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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
 sys_info+0x135/0x170
 watchdog+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x599/0xb30
 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: 15024 Comm: syz.1.1828 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:asm_sysvec_apic_timer_interrupt+0x0/0x20
Code: 56 16 5c 0a e9 61 06 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 11 05 00 00 48 89 c4 48 89 e7 e8 66 15 5c 0a e9 41 06 00 00 90 <f3> 0f 1e fa 0f 1f 00 fc 6a ff e8 f1 04 00 00 48 89 c4 48 89 e7 e8
RSP: 0018:ffffc900039a7198 EFLAGS: 00000002
RAX: ffffffff81a15738 RBX: ffffffff81a15591 RCX: ffff888111a39d40
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff8df35880
RBP: ffffc900039a72d0 R08: 000000000001ffff R09: 0000000000400000
R10: 0000000000400008 R11: fffffbfff1f0446f R12: 0000000000000000
R13: 000000000000004c R14: 0000000000000200 R15: 1ffff92000734e3c
FS:  00007fde18af26c0(0000) GS:ffff88818e832000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35e81c CR3: 00000001a204e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
RIP: 0010:vprintk_emit+0x4d0/0x5f0
Code: 0f 84 34 ff ff ff e8 7f 64 20 00 fb eb 44 e8 77 64 20 00 e8 e2 da ba 09 4d 85 f6 74 94 e8 68 64 20 00 fb 48 c7 c7 80 58 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 08 26
RSP: 0018:ffffc900039a71c0 EFLAGS: 00000202
 _printk+0xcf/0x120
 f2fs_printk+0x464/0x500
 f2fs_recover_fsync_data+0x23b/0x8850
 f2fs_fill_super+0x5c63/0x6ec0
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x302/0xa10
 __se_sys_mount+0x313/0x410
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fde17b90f6a
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:00007fde18af1e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fde18af1ef0 RCX: 00007fde17b90f6a
RDX: 0000200000000140 RSI: 0000200000000000 RDI: 00007fde18af1eb0
RBP: 0000200000000140 R08: 00007fde18af1ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fde18af1eb0 R14: 0000000000005505 R15: 0000200000000380
 </TASK>
