INFO: task syz.0.833:8627 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.833       state:D stack:28328 pid:8627  tgid:8626  ppid:5845   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 bdev_open+0xe0/0xd30
 blkdev_open+0x3a8/0x510
 do_dentry_open+0x953/0x13f0
 vfs_open+0x3b/0x340
 path_openat+0x2ee5/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8157b8d550
RSP: 002b:00007f8158ae2b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000200 RCX: 00007f8157b8d550
RDX: 0000000000000200 RSI: 00007f8158ae2c10 RDI: 00000000ffffff9c
RBP: 00007f8158ae2c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007f8157db6038 R14: 00007f8157db5fa0 R15: 00007ffccaea96e8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ea0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5674:
 #0: ffff88810b1810a0 (&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
1 lock held by udevd/5849:
 #0: ffff8881075c9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.0.833/8627:
 #0: ffff8881075c9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.5.2053/11891:
 #0: ffff8881075c9358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ac/0x340

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

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: 12585 Comm: rm 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:vm_mmap_pgoff+0x363/0x4d0
Code: 0f 85 0f 01 00 00 41 ff 87 20 02 00 00 48 8b 7c 24 30 e8 a0 df 9a ff 4c 89 ff 48 89 de e8 95 e8 48 00 48 8b 9c 24 80 00 00 00 <31> ff 48 89 de e8 33 a0 bd ff 48 85 db 74 17 e8 49 9b bd ff 4c 89
RSP: 0018:ffffc90002c8fd60 EFLAGS: 00000246
RAX: d15c1b8df113a400 RBX: 0000000000000000 RCX: ffff88801f03b980
RDX: 0000000000000000 RSI: ffffc90002c8fe00 RDI: ffff888039e96b80
RBP: ffffc90002c8fe80 R08: ffff888039e96cf7 R09: 1ffff110073d2d9e
R10: dffffc0000000000 R11: ffffed10073d2d9f R12: dffffc0000000000
R13: 1ffff92000591fb4 R14: 00007f51d70b8000 R15: ffff888039e96b80
FS:  0000000000000000(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f51d712eba8 CR3: 0000000028750000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ksys_mmap_pgoff+0x51f/0x760
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51d73ddb74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007fff1b608e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00000fffe36c11c4 RCX: 00007f51d73ddb74
RDX: 0000000000000001 RSI: 0000000000054188 RDI: 0000000000000000
RBP: 00007fff1b6091b0 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000246 R12: 00007f51d73b94b0
R13: 00007fff1b609238 R14: fffffffffffff000 R15: 0000000000000000
 </TASK>
