INFO: task kworker/1:7:18550 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:7     state:D stack:21208 pid:18550 tgid:18550 ppid:2      flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6817
 usb_kill_urb+0x1c9/0x300 drivers/usb/core/urb.c:713
 usb_start_wait_urb+0x1b0/0x520 drivers/usb/core/message.c:65
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x2b1/0x4c0 drivers/usb/core/message.c:154
 get_bMaxPacketSize0 drivers/usb/core/hub.c:4768 [inline]
 hub_port_init+0xc21/0x2620 drivers/usb/core/hub.c:4964
 hub_port_connect drivers/usb/core/hub.c:5412 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5623 [inline]
 port_event drivers/usb/core/hub.c:5783 [inline]
 hub_event+0x2908/0x50f0 drivers/usb/core/hub.c:5865
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4832:
 #0: ffff88802aad80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
2 locks held by kworker/u4:17/27926:
5 locks held by kworker/1:7/18550:
 #0: ffff888015362d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #0: ffff888015362d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #1: ffffc9000563fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
 #1: ffffc9000563fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
 #2: ffff8880242ea190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
 #2: ffff8880242ea190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1fe/0x50f0 drivers/usb/core/hub.c:5811
 #3: ffff8880242ed510 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3169 [inline]
 #3: ffff8880242ed510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5380 [inline]
 #3: ffff8880242ed510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline]
 #3: ffff8880242ed510 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline]
 #3: ffff8880242ed510 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x255f/0x50f0 drivers/usb/core/hub.c:5865
 #4: ffff88801e66f6c8 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5381 [inline]
 #4: ffff88801e66f6c8 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5623 [inline]
 #4: ffff88801e66f6c8 (hcd->address0_mutex){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5783 [inline]
 #4: ffff88801e66f6c8 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_event+0x259d/0x50f0 drivers/usb/core/hub.c:5865
1 lock held by syz-executor.1/5671:
 #0: ffff8880b943c958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:567

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2ef/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5160 Comm: syz-fuzzer Not tainted 6.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:do_dec_rlimit_put_ucounts kernel/ucount.c:301 [inline]
RIP: 0010:dec_rlimit_put_ucounts+0xc3/0x190 kernel/ucount.c:308
Code: 43 61 92 00 48 8b 6d 00 b8 80 02 00 00 48 01 c5 48 89 e8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 ef e8 21 61 92 00 48 8b 6d 00 <31> ff 48 89 de e8 d3 41 30 00 48 85 db 74 0f e8 e9 3c 30 00 48 85
RSP: 0018:ffffc900040a7b38 EFLAGS: 00000046
RAX: 1ffffffff1bfb17c RBX: 0000000000000002 RCX: ffff888022a18000
RDX: 0000000000000001 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81633009 R09: 1ffffffff1bfceba
R10: dffffc0000000000 R11: fffffbfff1bfcebb R12: ffffffff8dfe7540
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000000002
FS:  000000c010569090(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555bd5788 CR3: 0000000023456000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __sigqueue_free kernel/signal.c:447 [inline]
 collect_signal kernel/signal.c:593 [inline]
 __dequeue_signal+0x46f/0x5c0 kernel/signal.c:615
 dequeue_signal+0xd8/0x5a0 kernel/signal.c:635
 get_signal+0x5f6/0x1850 kernel/signal.c:2773
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x78/0x270 kernel/entry/common.c:225
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0033:0x418071
Code: 01 00 00 00 49 d3 e5 48 83 ff 40 48 19 ff 49 21 fc 49 8d 7c 24 ff 48 83 f9 40 4d 19 db 4d 21 dd 49 f7 dd 49 09 fd 4e 23 2c d6 <4c> 09 eb 4a 89 1c d6 48 85 d2 74 35 84 06 49 c1 ea 03 49 81 fa 00
RSP: 002b:000000c000c6ed80 EFLAGS: 00000202
RAX: 000000c0153bc400 RBX: 0000000000130000 RCX: 0000000000000018
RDX: 0000000000000000 RSI: 00007f3c34af4000 RDI: 000000000000ffff
RBP: 000000c000c6ed90 R08: 0000800000000000 R09: 00000000600a9de2
R10: 0000000000009de2 R11: ffffffffffffffff R12: 0000000000010000
R13: 1313131313001313 R14: 000000c011804340 R15: 0000000000000012
 </TASK>