INFO: task syz.2.2387:17240 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2387      state:D stack:25128 pid:17240 tgid:17239 ppid:15652  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 usbdev_open+0x16e/0x760
 chrdev_open+0x4cc/0x5e0
 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: 0033:0x7f3dcab8d590
RSP: 002b:00007f3dcbaf0b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000101301 RCX: 00007f3dcab8d590
RDX: 0000000000101301 RSI: 00007f3dcbaf0c10 RDI: 00000000ffffff9c
RBP: 00007f3dcbaf0c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007f3dcadd6038 R14: 00007f3dcadd5fa0 R15: 00007fff696eb5c8
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
 #0: ffff88802247b948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900000f7bc0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
3 locks held by kworker/1:0/24:
 #0: ffff88801bf82148
 ((wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_scheduled_works+0x9b4/0x17b0
 #1: 
ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x19c/0x4a0
 #2: ffff888108f1a220
 (
&dev->power.lock){-.-.}-{3:3}, at: rpm_idle+0x5e9/0x950
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:1/51:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000079fbc0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
2 locks held by kworker/u10:2/68:
 #0: ffff88801b3e5148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000175fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
3 locks held by kworker/0:2/791:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004cbfbc0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888134f95240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x26b/0x3180
2 locks held by getty/5673:
 #0: ffff8880207190a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
9 locks held by kworker/0:6/12640:
1 lock held by syz-executor/15182:
 #0: ffff888111dec0e0 (&type->s_umount_key#58){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.2.2387/17240:
 #0: ffff888108eea198 (&dev->mutex){....}-{4:4}
, at: usbdev_open+0x16e/0x760
5 locks held by kworker/u8:3/17817:
 #0: 
ffff88801b2f7148
 (
(wq_completion)netns
){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90002e9fbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52d310 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x2a4/0x990
 #4: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz-executor/18086:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz.4.2573/18321:
 #0: ffff888111dec0e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.7.2601/18483:
 #0: ffff888111dec0e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/19128:
 #0: ffffffff8f53a1c8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0

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

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+0x439/0x7d0
 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: 12640 Comm: kworker/0:6 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
Workqueue: usb_hub_wq hub_event
RIP: 0010:wq_watchdog_touch+0x27/0x180
Code: 90 90 90 66 0f 1f 00 55 41 57 41 56 41 55 41 54 53 89 fb 49 bf 00 00 00 00 00 fc ff df e8 91 96 34 00 4c 6b 25 b9 e9 72 0c 64 <4c> 8b 2d d2 e9 72 0c 48 c7 c0 00 12 e1 8d 48 c1 e8 03 42 80 3c 38
RSP: 0018:ffffc90001cae1a8 EFLAGS: 00000002
RAX: ffffffff818b297f RBX: 0000000000000000 RCX: 0000000000100000
RDX: ffffc90027eac000 RSI: 00000000000fffff RDI: 0000000000100000
RBP: ffffc90001cae390 R08: 0000000000000000 R09: ffffffff81a06e9a
R10: dffffc0000000000 R11: ffffffff854ebd50 R12: 00000000000036b0
R13: dffffc0000000000 R14: ffffffff99df9718 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8611000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f366a307d60 CR3: 00000000288f6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 serial8250_console_write+0xd7/0x1ba0
 console_flush_all+0x728/0xc40
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 dev_vprintk_emit+0x337/0x3f0
 dev_printk_emit+0xe0/0x130
 __netdev_printk+0x3d7/0x4d0
 netdev_warn+0x10a/0x160
 asix_mdio_read+0x257/0x530
 asix_phy_reset+0xbc/0x1b0
 ax88172_bind+0x3f0/0x5e0
 usbnet_probe+0xa96/0x2870
 usb_probe_interface+0x668/0xc30
 really_probe+0x26d/0x9e0
 __driver_probe_device+0x18c/0x2f0
 driver_probe_device+0x4f/0x430
 __device_attach_driver+0x2ce/0x530
 bus_for_each_drv+0x251/0x2e0
 __device_attach+0x2b8/0x400
 bus_probe_device+0x185/0x260
 device_add+0x7b6/0xb50
 usb_set_configuration+0x1a87/0x20e0
 usb_generic_driver_probe+0x8d/0x150
 usb_probe_device+0x1c4/0x390
 really_probe+0x26d/0x9e0
 __driver_probe_device+0x18c/0x2f0
 driver_probe_device+0x4f/0x430
 __device_attach_driver+0x2ce/0x530
 bus_for_each_drv+0x251/0x2e0
 __device_attach+0x2b8/0x400
 bus_probe_device+0x185/0x260
 device_add+0x7b6/0xb50
 usb_new_device+0xa39/0x16f0
 hub_event+0x2958/0x4a20
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
