INFO: task kworker/0:0:9 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:21536 pid:9     tgid:9     ppid:2      task_flags:0x4288060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 wait_for_completion+0x2ca/0x5e0
 ath9k_hif_usb_disconnect+0xb8/0x250
 usb_unbind_interface+0x295/0x9f0
 device_release_driver_internal+0x4f5/0x880
 bus_remove_device+0x444/0x560
 device_del+0x524/0x8f0
 usb_disable_device+0x3d4/0x8d0
 usb_disconnect+0x346/0x9a0
 hub_event+0x1bbb/0x4d30
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/0:0/9:
 #0: ffff8881689e5540 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900000e7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff888170b931d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
 #3: ffff88811eab61d8 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0xfc/0x9a0
 #4: ffff888106ee71a0 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
5 locks held by kworker/1:0/24:
 #0: ffff8881689e5540 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900001e7c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff888170cbc1d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
 #3: ffff88811e2371d8 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0xfc/0x9a0
 #4: ffff88811f3b61a0 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb9/0x880
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by syslogd/5040:
1 lock held by klogd/5047:
1 lock held by udevd/5058:
2 locks held by dhcpcd/5353:
2 locks held by getty/5437:
 #0: ffff88810e4ae0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
6 locks held by kworker/u8:2/5504:
 #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900042cfc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9001f328 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffff88811e9bd128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff88811e9de258 (&devlink->lock_key#3){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
1 lock held by syz-executor/5596:
3 locks held by kworker/0:3/5614:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000473fc40 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8e9f5988 (umhelper_sem){++++}-{4:4}, at: usermodehelper_read_lock_wait+0x10b/0x220
2 locks held by kworker/0:5/5677:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90004a1fc40 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by syz-executor/7909:
 #0: ffff888102b0cea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x22a/0x5b0
 #1: ffff888102b0c0b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x61f/0x10a0
1 lock held by syz.1.1083/8599:
 #0: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
1 lock held by syz-executor/8713:
1 lock held by syz-executor/8797:
3 locks held by kworker/u10:8/9118:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000321fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002dec0 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
2 locks held by syz.7.1220/9123:

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

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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 9119 Comm: kworker/u9:12 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: events_unbound cfg80211_wiphy_work
RIP: 0010:check_preemption_disabled+0x1f/0xe0
Code: 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 53 65 8b 05 f7 fd 9b 07 65 8b 0d ec fd 9b 07 f7 c1 ff ff ff 7f 74 0c 5b 41 5e <41> 5f 5d e9 49 e5 02 00 cc 9c 59 f7 c1 00 02 00 00 74 ea 65 4c 8b
RSP: 0018:ffffc90000007ba8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88805cd11980 RCX: 0000000080000101
RDX: ffff88810efe9dc0 RSI: ffffffff8d0bd120 RDI: ffffffff8c4bdd80
RBP: ffff888207d6d9c0 R08: ffff88805cd11a67 R09: 1ffff1100b9a234c
R10: dffffc0000000000 R11: ffffed100b9a234d R12: ffff88805cd11a50
R13: 1ffff11040fadb38 R14: 0000000000000001 R15: 0000000000000040
FS:  0000000000000000(0000) GS:ffff88818d94b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5c87bfcffc CR3: 000000010fcea000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 ip_rcv_core+0x27d/0xd50
 ip_rcv+0x4d/0x90
 process_backlog+0xa34/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 do_softirq+0x76/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130
 ieee80211_ibss_rx_queued_mgmt+0x1e97/0x2c40
 ieee80211_iface_work+0x78a/0x1010
 cfg80211_wiphy_work+0x29e/0x420
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
