INFO: task syz.6.2839:12931 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.6.2839      state:D stack:27104 pid:12931 tgid:12930 ppid:12099  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7f5/0x1550
 usbdev_open+0x182/0x770
 chrdev_open+0x4cd/0x5e0
 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+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f5975d04e
RSP: 002b:00007f7f5a5fcb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f7f5a5fd6c0 RCX: 00007f7f5975d04e
RDX: 000000000000a001 RSI: 00007f7f5a5fcc00 RDI: ffffffffffffff9c
RBP: 00007f7f5a5fcc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f7f59a16038 R14: 00007f7f59a15fa0 R15: 00007ffe33d94b68
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/1:0/24:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by udevd/5277:
2 locks held by getty/5653:
 #0: ffff8881130f30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by syz.6.2839/12931:
 #0: ffff88816fa7f1d8 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 24 Comm: kworker/1:0 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
Workqueue: usb_hub_wq hub_event
RIP: 0010:__pi___x86_indirect_thunk_r11+0x6/0x20
Code: 00 00 00 00 e8 01 00 00 00 cc 4c 89 14 24 e9 d1 0a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 e8 01 00 00 00 cc <4c> 89 1c 24 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80
RSP: 0018:ffffc90000a08718 EFLAGS: 00000082
RAX: ffffffff86039f1f RBX: ffffc90000a087e0 RCX: 0000000080000100
RDX: 0000000000000001 RSI: ffffffff86039f1f RDI: ffffc90000a087e0
RBP: ffffc90000a087b0 R08: ffffc900001e73e0 R09: 0000000000000000
R10: ffffc90000a08778 R11: ffffffff81b0f610 R12: ffff888160a98000
R13: 0000000000000000 R14: ffffffff81b0f610 R15: ffffc90000a08728
FS:  0000000000000000(0000) GS:ffff8882a921b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97f5be7158 CR3: 000000011813e000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 </TASK>
