INFO: task kworker/1:3:4155 blocked for more than 143 seconds. Not tainted 6.0.0-rc4-syzkaller-00066-g7eb2bf871454 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:3 state:D stack:21560 pid: 4155 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5182 [inline] __schedule+0x93f/0x26f0 kernel/sched/core.c:6494 schedule+0xda/0x1b0 kernel/sched/core.c:6570 scsi_remove_host+0x3f7/0x540 drivers/scsi/hosts.c:199 quiesce_and_remove_host drivers/usb/storage/usb.c:867 [inline] usb_stor_disconnect+0x115/0x260 drivers/usb/storage/usb.c:1087 usb_unbind_interface+0x1d8/0x8e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:542 __device_release_driver drivers/base/dd.c:1249 [inline] device_release_driver_internal+0x4a1/0x700 drivers/base/dd.c:1275 bus_remove_device+0x2e3/0x590 drivers/base/bus.c:529 device_del+0x4f3/0xc80 drivers/base/core.c:3704 usb_disable_device+0x356/0x7a0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x259/0x6ed drivers/usb/core/hub.c:2235 hub_port_connect drivers/usb/core/hub.c:5197 [inline] hub_port_connect_change drivers/usb/core/hub.c:5497 [inline] port_event drivers/usb/core/hub.c:5653 [inline] hub_event+0x1f86/0x4610 drivers/usb/core/hub.c:5735 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2ea/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffffffff87a94550 ( rcu_tasks.tasks_gp_mutex ){+.+.}-{3:3} , at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/26: #0: ffffffff87a950a0 ( rcu_read_lock ){....}-{1:2} , at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6492 2 locks held by getty/1238: #0: ffff88810a0e6098 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900000432f0 ( &ldata->atomic_read_lock ){+.+.}-{3:3} , at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177 5 locks held by kworker/1:3/4155: #0: ffff888109b57138 ( (wq_completion)usb_hub_wq ){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] , at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] , at: set_work_data kernel/workqueue.c:636 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] , at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000186fda8 ( (work_completion)(&hub->events) ){+.+.}-{0:0} , at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff88810f4c9190 ( &dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] &dev->mutex){....}-{3:3}, at: hub_event+0x1bc/0x4610 drivers/usb/core/hub.c:5681 #3: ffff88811cc62190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x6ed drivers/usb/core/hub.c:2226 #4: ffff888109b71118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline] (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1073 [inline] (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa0/0x700 drivers/base/dd.c:1272 3 locks held by udevd/4161: #0: ffff888139b6cc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_file_read_iter fs/kernfs/file.c:253 [inline] ffff888139b6cc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_read_iter+0x189/0x710 fs/kernfs/file.c:300 #1: ffff88811374ea00 ( kn->active#51){++++}-{0:0}, at: kernfs_file_read_iter fs/kernfs/file.c:254 [inline] kn->active#51){++++}-{0:0}, at: kernfs_fop_read_iter+0x1ac/0x710 fs/kernfs/file.c:300 #2: ffff88811cc62190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:840 [inline] ffff88811cc62190 (&dev->mutex){....}-{3:3}, at: read_descriptors+0x3c/0x2c0 drivers/usb/core/sysfs.c:873 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 6.0.0-rc4-syzkaller-00066-g7eb2bf871454 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc18/0xf50 kernel/hung_task.c:369 kthread+0x2ea/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 0 to CPUs 1: cdc_wdm 5-1:1.0: nonzero urb status received: -71 NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc4-syzkaller-00066-g7eb2bf871454 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2022 RIP: 0010:format_decode+0x3d7/0xad0 lib/vsprintf.c:2643 Code: 00 41 8d 44 24 a8 3c 20 0f 87 f2 01 00 00 0f b6 c0 ff 24 c5 68 61 64 86 e8 96 04 1f ff 80 4d 04 20 e8 8d 04 1f ff c6 45 05 10 84 04 1f ff 89 de bf 4c 00 00 00 e8 f8 00 1f ff 80 fb 4c 0f 84 RSP: 0018:ffffc900001780d8 EFLAGS: 00000083 RAX: 000000000000001d RBX: 000000000000006c RCX: ffffffff82270834 RDX: ffff8881002d5580 RSI: 0000000000000100 RDI: 0000000000000001 RBP: ffffc900001781f0 R08: 0000000000000001 R09: 0000000000000078 R10: 0000000000000075 R11: 0000000000000001 R12: 0000000000000075 R13: ffffffff86487a21 R14: 1ffff9200002f01e R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1176ed2fc0 CR3: 000000011028d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vsnprintf+0x155/0x14f0 lib/vsprintf.c:2734 sprintf+0xc0/0x100 lib/vsprintf.c:2986 print_time kernel/printk/printk.c:1277 [inline] info_print_prefix+0x248/0x340 kernel/printk/printk.c:1303 record_print_text+0x14d/0x3e0 kernel/printk/printk.c:1352 console_emit_next_record.constprop.0+0x6bf/0x840 kernel/printk/printk.c:2715 console_flush_all kernel/printk/printk.c:2794 [inline] console_unlock+0x37a/0x5a0 kernel/printk/printk.c:2861 vprintk_emit+0x1b9/0x5f0 kernel/printk/printk.c:2271 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4736 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4747 __dev_printk+0xcf/0xf5 drivers/base/core.c:4759 _dev_err+0xd7/0x109 drivers/base/core.c:4802 wdm_int_callback.cold+0xc2/0x104 drivers/usb/class/cdc-wdm.c:269 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1671 usb_hcd_giveback_urb+0x380/0x430 drivers/usb/core/hcd.c:1754 dummy_timer+0x11ff/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:1988 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1c0/0x9a9 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x113/0x170 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] RIP: 0010:acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:113 Code: fb 84 db 74 06 5b e9 c0 18 50 fb e8 bb 18 50 fb e8 a6 85 56 fb 66 90 e8 af 18 50 fb 0f 00 2d 18 2a 76 00 e8 a3 18 50 fb fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 6e 15 50 fb 48 85 db RSP: 0018:ffffc9000010fd20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8881002d5580 RSI: ffffffff85f5f44d RDI: 0000000000000000 RBP: ffff888109487864 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000001 R14: ffff888109487800 R15: ffff88810b18c804 acpi_idle_do_entry drivers/acpi/processor_idle.c:555 [inline] acpi_idle_enter+0x524/0x6a0 drivers/acpi/processor_idle.c:692 cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x3e8/0x590 kernel/sched/idle.c:303 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262 secondary_startup_64_no_verify+0xce/0xdb