INFO: task kworker/0:5:6000 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:5     state:D stack:21096 pid:6000  tgid:6000  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 usb_audio_probe+0x82e/0x2330
 usb_probe_interface+0x668/0xc90
 really_probe+0x267/0xaf0
 __driver_probe_device+0x18c/0x320
 driver_probe_device+0x4f/0x240
 __device_attach_driver+0x279/0x430
 bus_for_each_drv+0x258/0x2f0
 __device_attach+0x2c5/0x450
 device_initial_probe+0xa1/0xd0
 bus_probe_device+0x12a/0x220
 device_add+0x7b6/0xb70
 usb_set_configuration+0x1a87/0x2110
 usb_generic_driver_probe+0x8d/0x150
 usb_probe_device+0x1c4/0x3b0
 really_probe+0x267/0xaf0
 __driver_probe_device+0x18c/0x320
 driver_probe_device+0x4f/0x240
 __device_attach_driver+0x279/0x430
 bus_for_each_drv+0x258/0x2f0
 __device_attach+0x2c5/0x450
 device_initial_probe+0xa1/0xd0
 bus_probe_device+0x12a/0x220
 device_add+0x7b6/0xb70
 usb_new_device+0xa08/0x16f0
 hub_event+0x2a1c/0x4f30
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.9.17650:2150 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.9.17650     state:D stack:28160 pid:2150  tgid:2149  ppid:30803  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 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+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b8215d68e
RSP: 002b:00007f0b8311db28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0b8311e6c0 RCX: 00007f0b8215d68e
RDX: 0000000000003501 RSI: 00007f0b8311dc00 RDI: ffffffffffffff9c
RBP: 00007f0b8311dc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f0b82416038 R14: 00007f0b82415fa0 R15: 00007ffd28c50148
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5634:
 #0: ffff8881125030a0 (&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
6 locks held by kworker/1:3/5853:
 #0: ffff888167cff548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000672fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff8881077e11e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff888170d831e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff8881b0afe1a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffffffff8fb36548 (register_mutex#6){+.+.}-{4:4}, at: usb_audio_probe+0x82e/0x2330
6 locks held by kworker/0:5/6000:
 #0: ffff888167cff548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006fdfc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff8881077c91e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff888113cd91e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff88802381a1a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffffffff8fb36548 (register_mutex#6){+.+.}-{4:4}, at: usb_audio_probe+0x82e/0x2330
6 locks held by kworker/1:5/1898:
4 locks held by udevd/29450:
 #0: ffff8881aac96540 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88816a255888 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff88816f3a0e18 (kn->active#28){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff888170d831e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by udevd/32037:
 #0: ffff8881188c42f0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff888110d9dc88 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff888029a132d8 (kn->active#31){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff888113cd91e0 (&dev->mutex){....}-{4:4}, at: serial_show+0x26/0xa0
1 lock held by syz.9.17650/2150:
 #0: ffff888106fe91e0 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770
1 lock held by syz.1.18952/6155:
 #0: ffff888106fe91e0 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1898 Comm: kworker/1:5 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:__sanitizer_cov_trace_pc+0x5c/0x70
Code: 80 16 00 00 83 fa 02 75 21 48 8b 91 88 16 00 00 48 8b 32 48 8d 7e 01 8b 89 84 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <e9> 0f 06 ec 09 cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90003876a18 EFLAGS: 00000246
RAX: ffffffff89518c5b RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc9002b001000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc90003876c20 R08: ffff88823c640f03 R09: 1ffff110478c81e0
R10: dffffc0000000000 R11: ffffed10478c81e1 R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000000007fb R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8882a945d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b729e8158 CR3: 0000000115326000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __snd_usb_parse_audio_interface+0x33fb/0x4c80
 snd_usb_parse_audio_interface+0x39/0xc0
 snd_usb_create_stream+0x3d2/0x640
 usb_audio_probe+0x17e5/0x2330
 usb_probe_interface+0x668/0xc90
 really_probe+0x267/0xaf0
 __driver_probe_device+0x18c/0x320
 driver_probe_device+0x4f/0x240
 __device_attach_driver+0x279/0x430
 bus_for_each_drv+0x258/0x2f0
 __device_attach+0x2c5/0x450
 device_initial_probe+0xa1/0xd0
 bus_probe_device+0x12a/0x220
 device_add+0x7b6/0xb70
 usb_set_configuration+0x1a87/0x2110
 usb_generic_driver_probe+0x8d/0x150
 usb_probe_device+0x1c4/0x3b0
 really_probe+0x267/0xaf0
 __driver_probe_device+0x18c/0x320
 driver_probe_device+0x4f/0x240
 __device_attach_driver+0x279/0x430
 bus_for_each_drv+0x258/0x2f0
 __device_attach+0x2c5/0x450
 device_initial_probe+0xa1/0xd0
 bus_probe_device+0x12a/0x220
 device_add+0x7b6/0xb70
 usb_new_device+0xa08/0x16f0
 hub_event+0x2a1c/0x4f30
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
