INFO: task kworker/1:0:22 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:21712 pid:22    ppid:2      flags:0x00004000
Workqueue: events console_callback

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xc79/0x30a0 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 schedule_timeout+0x278/0x2c0 kernel/time/timer.c:2143
 ___down_common kernel/locking/semaphore.c:225 [inline]
 __down_common+0x327/0x6c0 kernel/locking/semaphore.c:246
 down+0x74/0xa0 kernel/locking/semaphore.c:63
 console_lock+0x96/0x150 kernel/printk/printk.c:2652
 console_callback+0x63/0x4c0 drivers/tty/vt/vt.c:2933
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/1:0/22:
 #0: ffff888100070d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc9000017fd80 (console_work){+.+.}-{0:0}
, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
1 lock held by khungtaskd/29:
 #0: ffffffff87eac820
 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:749 [inline]
 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
3 locks held by kworker/0:2/2402:
2 locks held by getty/2446:
 #0: ffff88810b3f90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900000432f0
 (&ldata->atomic_read_lock
){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206
6 locks held by kworker/1:3/5240:
 #0: ffff88810a658538
 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: 
ffffc90001cdfd80 (
(work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff888105fad190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline]
 #2: ffff888105fad190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768
 #3: 
ffff888106338500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3138 [inline]
ffff888106338500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5337 [inline]
ffff888106338500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
ffff888106338500 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5740 [inline]
ffff888106338500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x28b4/0x4f30 drivers/usb/core/hub.c:5822
 #4: 
ffff888102bfd268
 (hcd->address0_mutex
){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5338 [inline]
){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5740 [inline]
){+.+.}-{3:3}, at: hub_event+0x28da/0x4f30 drivers/usb/core/hub.c:5822
 #5: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline]
 #5: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
 #5: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1681 [inline]
 #5: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x290/0x30a0 kernel/sched/core.c:6612
5 locks held by kworker/1:4/5246:
 #0: ffff88810a658538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc90001e4fd80 (
(work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff888105bfd190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline]
 #2: ffff888105bfd190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768
 #3: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:558 [inline]
 #3: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1372 [inline]
 #3: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1681 [inline]
 #3: ffff8881f673b558 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x290/0x30a0 kernel/sched/core.c:6612
 #4: ffffffff8c0be058 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x1a0/0x490 lib/debugobjects.c:717
3 locks held by kworker/0:8/5805:
5 locks held by kworker/1:10/10372:
2 locks held by kworker/0:12/15020:
3 locks held by kworker/1:14/16188:
 #0: ffff888104e6dd38 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc900106efd80 ((work_completion)(&hcd->wakeup_work)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff88810633d190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline]
 #2: ffff88810633d190 (&dev->mutex){....}-{3:3}, at: usb_remote_wakeup+0x21/0xe0 drivers/usb/core/hub.c:3772
3 locks held by kworker/1:5/19068:
 #0: ffff88810a658538 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x787/0x15c0 kernel/workqueue.c:2605
 #1: ffffc900118d7d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7e9/0x15c0 kernel/workqueue.c:2606
 #2: ffff888106388190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline]
 #2: ffff888106388190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768
1 lock held by syz-executor.4/20433:
 #0: ffffffff87eb80f8 (rcu_state.exp_mutex
){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x404/0x7e0 kernel/rcu/tree_exp.h:992

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x26c/0x2d0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 19068 Comm: kworker/1:5 Not tainted 6.6.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_in+0x87/0xa0 drivers/tty/serial/8250/8250_port.c:418
Code: ed c8 fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 16 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 e8 6c 59 15 ff eb a6 e8 c5 59 15 ff eb e3
RSP: 0018:ffffc900118d7378 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82848600 RDI: ffffffff8c156ee0
RBP: ffffffff8c156ea0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 205d333332365420 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff182ae2e R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79308f1d58 CR3: 000000011141a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 serial_in drivers/tty/serial/8250/8250.h:117 [inline]
 serial_lsr_in drivers/tty/serial/8250/8250.h:139 [inline]
 wait_for_lsr+0xd7/0x180 drivers/tty/serial/8250/8250_port.c:2086
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3371 [inline]
 serial8250_console_write+0xce5/0x1060 drivers/tty/serial/8250/8250_port.c:3449
 console_emit_next_record kernel/printk/printk.c:2910 [inline]
 console_flush_all+0x4eb/0xfb0 kernel/printk/printk.c:2966
 console_unlock+0x10c/0x260 kernel/printk/printk.c:3035
 vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2307
 dev_vprintk_emit drivers/base/core.c:4849 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4860
 __dev_printk+0xf5/0x270 drivers/base/core.c:4872
 _dev_info+0xe5/0x120 drivers/base/core.c:4918
 show_string drivers/usb/core/hub.c:2303 [inline]
 show_string drivers/usb/core/hub.c:2299 [inline]
 announce_device drivers/usb/core/hub.c:2320 [inline]
 usb_new_device+0x928/0x1960 drivers/usb/core/hub.c:2570
 hub_port_connect drivers/usb/core/hub.c:5440 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
 port_event drivers/usb/core/hub.c:5740 [inline]
 hub_event+0x2e62/0x4f30 drivers/usb/core/hub.c:5822
 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x33c/0x440 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>