INFO: task syz.0.7511:12239 blocked for more than 163 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.7511      state:D stack:26248 pid:12239 tgid:12221 ppid:11720  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 bdev_open+0xe0/0xd30
 blkdev_open+0x470/0x610
 do_dentry_open+0x785/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f156435cfce
RSP: 002b:00007f15651f1b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f15651f26c0 RCX: 00007f156435cfce
RDX: 0000000000002c00 RSI: 00007f15651f1c00 RDI: ffffffffffffff9c
RBP: 00007f15651f1c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f1564616128 R14: 00007f1564616090 R15: 00007fffcc489f88
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5632:
 #0: ffff88810f6760a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
2 locks held by udevd/10778:
5 locks held by kworker/u9:22/18978:
1 lock held by udevd/19137:
 #0: ffff8881047b9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.0.7511/12239:
 #0: ffff8881047b9358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
3 locks held by syz.9.8351/15832:
2 locks held by syz.9.8351/15863:
3 locks held by syz.3.8355/15862:

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

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+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:
EXT4-fs (loop3): error count since last fsck: 1
EXT4-fs (loop3): initial error at time 1774159383: ext4_free_branches:1023: inode 11
EXT4-fs (loop3): last error at time 1774159383: ext4_free_branches:1023: inode 11
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15862 Comm: syz.3.8355 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: 26 27 ae 0a e9 81 06 00 00 90 f3 0f 1e fa 0f 1f 00 fc 6a ff e8 31 05 00 00 48 89 c4 48 89 e7 e8 36 26 ae 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
RSP: 0018:ffffc9000a03f658 EFLAGS: 00000083
RAX: ffffffff81a473d5 RBX: ffffffff81a4724f RCX: 0000000000080000
RDX: ffffc90021c57000 RSI: 0000000000037d91 RDI: ffffffff8e750960
RBP: ffffc9000a03f730 R08: ffffffff90119ab7 R09: 1ffffffff2023356
R10: dffffc0000000000 R11: fffffbfff2023357 R12: 0000000000000000
R13: 0000000000000074 R14: 0000000000000200 R15: 1ffff92001407ed4
FS:  00007fbfa6a576c0(0000) GS:ffff88818de60000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000160000 CR3: 0000000112ed4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
RIP: 0010:vprintk_emit+0x45d/0x560
Code: 0f 84 44 ff ff ff e8 d2 2d 21 00 fb eb 44 e8 ca 2d 21 00 e8 c5 ce 09 0a 4d 85 f6 74 94 e8 bb 2d 21 00 fb 48 c7 c7 60 09 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 1b 16
RSP: 0018:ffffc9000a03f680 EFLAGS: 00000283
 _printk+0xdd/0x130
 __ext4_msg+0x2b9/0x2d0
 ext4_fill_super+0x292a/0x6320
 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: 0033:0x7fbfa5b9da0a
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:00007fbfa6a56e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbfa6a56ee0 RCX: 00007fbfa5b9da0a
RDX: 0000200000000040 RSI: 0000200000000000 RDI: 00007fbfa6a56ea0
RBP: 0000200000000040 R08: 00007fbfa6a56ee0 R09: 0000000000010000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fbfa6a56ea0 R14: 00000000000004d4 R15: 0000200000000100
 </TASK>
