INFO: task syz.0.1613:16068 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.0.1613      state:D stack:26904 pid:16068 tgid:16066 ppid:15825  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 super_lock+0x1e0/0x3d0
 __iterate_supers+0x126/0x250
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8dba39cdd9
RSP: 002b:00007f8dbb1ed028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f8dba616090 RCX: 00007f8dba39cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8dba616090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8dba616128 R14: 00007f8dba616090 R15: 00007ffc16756038
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/0:1/10:
 #0: ffff888105285d40 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc900000f7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff88816d4521d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff88816d3af568 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x217a/0x4f30
 #4: ffff88816d256460 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21a2/0x4f30
 #5: ffffffff8f6811a8 (ehci_cf_port_reset_rwsem){.+.+}-{4:4}, at: hub_port_reset+0x14e/0x1840
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5439:
 #0: ffff8881124d00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
7 locks held by syz.6.1320/14377:
1 lock held by udevd/15451:
 #0: ffff88816a249350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by syz.2.2142/18728:
4 locks held by syz.9.2140/18727:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 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+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: 14377 Comm: syz.6.1320 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:__sanitizer_cov_trace_pc+0x45/0x70
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 d4 16 00 00 00 74 2c 8b 91 b0 16 00 00 83 fa 02 75 21 48 8b 91 b8 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 b4 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2
RSP: 0018:ffffc9000466e178 EFLAGS: 00000246
RAX: ffffffff81a61bbf RBX: 0000000000512b40 RCX: ffff888112345880
RDX: ffffc90024c9d000 RSI: 000000000007ffff RDI: 0000000000000001
RBP: ffffc9000466e300 R08: ffff888112345880 R09: 0000000000000003
R10: 00000000ffffffff R11: 0000000000000002 R12: ffffc9000466e490
R13: 000000000000d226 R14: ffffffff8e8d6cb0 R15: dffffc0000000000
FS:  00007f77545cf6c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000008ec000 CR3: 000000011f5f8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _prb_read_valid+0x4ef/0xab0
 prb_read_valid+0x3c/0x60
 printk_get_next_message+0x18b/0x880
 console_flush_all+0x501/0xb20
 console_unlock+0xd1/0x1c0
 vprintk_emit+0x485/0x560
 _printk+0xdd/0x130
 __mlog_printk+0x283/0x2c0
 ocfs2_find_entry+0x493/0x21a0
 ocfs2_find_files_on_disk+0xe0/0x340
 ocfs2_lookup_ino_from_name+0x52/0x100
 ocfs2_get_system_file_inode+0x330/0x7e0
 ocfs2_init_global_system_inodes+0x2f6/0x6e0
 ocfs2_fill_super+0x45ac/0x6970
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f775379e04a
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:00007f77545cee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f77545ceee0 RCX: 00007f775379e04a
RDX: 0000200000004440 RSI: 0000200000000040 RDI: 00007f77545ceea0
RBP: 0000200000004440 R08: 00007f77545ceee0 R09: 00000000000008c0
R10: 00000000000008c0 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f77545ceea0 R14: 000000000000446c R15: 0000200000000080
 </TASK>
