INFO: task kworker/1:3:5828 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/1:3     state:D stack:21096 pid:5828  tgid:5828  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>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5633:
 #0: ffff888177ee50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by udevd/5807:
 #0: ffff888117dcdd58 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88810d613c88 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff888115039a58 (kn->active#22){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff88810d8f51e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by udevd/5818:
 #0: ffff88816ff7fe80 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff8881ae579488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff8881a3892d28 (kn->active#22){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881a69421e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
6 locks held by kworker/1:3/5828:
 #0: ffff88816812e148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000696fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88817011b1e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8881a954c1e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff8881689b71a8 (&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/1:6/5874:
 #0: ffff88816812e148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006b9fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816fbfa1e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8881680ac1e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff88816b2971a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffffffff8fb36548 (register_mutex#6){+.+.}-{4:4}, at: usb_audio_probe+0x82e/0x2330
4 locks held by udevd/6389:
 #0: ffff888117dcd790 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88811e5ee088 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff8881ae9ed1e8 (kn->active#22){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881680ac1e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by udevd/7193:
 #0: ffff88810e85d0a0 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88810d307488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff88819b902008 (kn->active#25){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881a954c1e0 (&dev->mutex){....}-{4:4}, at: serial_show+0x26/0xa0
6 locks held by kworker/0:5/7432:
6 locks held by kworker/1:8/19078:
 #0: ffff88816812e148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900068bfc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816fe0a1e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8881b6d101e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff88816d8511a8 (&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/1:9/19114:
 #0: ffff88816812e148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900049d7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816ff021e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8881a69421e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff8881a79cc1a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffffffff8fb36548 (register_mutex#6){+.+.}-{4:4}, at: usb_audio_probe+0x82e/0x2330
1 lock held by syz.9.5639/21146:
 #0: ffff88816fda21e0 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770
1 lock held by syz.2.6438/23566:
 #0: ffff88816ff021e0 (&dev->mutex){....}-{4:4}, at: usbdev_open+0x182/0x770

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

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+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:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5797 Comm: syz-executor 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:apparmor_file_permission+0x0/0x300
Code: ff 4c 89 f7 e8 81 4d c6 fd e9 89 fc ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 50 89 74 24 04 48 89 fd
RSP: 0018:ffffc90006627c28 EFLAGS: 00000293
RAX: ffffffff845f1114 RBX: 0000000000000004 RCX: ffff888114553a80
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88817449e000
RBP: 0000000000000000 R08: ffff888110c7b003 R09: 1ffff1102218f600
R10: dffffc0000000000 R11: ffffed102218f601 R12: ffff88817449e000
R13: 0000000000000001 R14: ffff88817449e000 R15: 0000000000000000
FS:  0000555587b0e540(0000) GS:ffff88818de5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ac68816000 CR3: 000000016e19e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 security_file_permission+0x8d/0x260
 rw_verify_area+0xbb/0x4d0
 vfs_read+0x160/0xa70
 ksys_read+0x150/0x270
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fade9157fd7
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdbc5a3050 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000555587b0e540 RCX: 00007fade9157fd7
RDX: 0000000000000004 RSI: 00007ffdbc5a30ac RDI: 0000000000000003
RBP: 00007ffdbc5a3550 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007ffdbc5a30ac R14: 00007ffdbc5a3140 R15: 0000000000000000
 </TASK>
