vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN INFO: task kworker/1:3:9057 blocked for more than 140 seconds. Not tainted 4.14.232-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:3 D26824 9057 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 drivers/usb/core/message.c:151 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN usb_get_descriptor+0xc0/0x160 drivers/usb/core/message.c:652 usb_get_device_descriptor+0x71/0xd0 drivers/usb/core/message.c:924 hub_port_init+0x629/0x2970 drivers/usb/core/hub.c:4647 hub_port_connect drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline] port_event drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 drivers/usb/core/hub.c:5274 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 5 locks held by kworker/1:3/9057: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN NMI backtrace for cpu 1 CPU: 1 PID: 27505 Comm: syz-executor.1 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880757c6100 task.stack: ffff888099da0000 RIP: 0010:reacquire_held_locks+0x3/0x3f0 kernel/locking/lockdep.c:3633 RSP: 0018:ffff8880ba507db0 EFLAGS: 00000046 RAX: 0000000000000005 RBX: 1ffff110174a0fba RCX: 1ffff1100eaf8d45 RDX: 0000000000000005 RSI: 0000000000000005 RDI: ffff8880757c6100 RBP: 0000000000000004 R08: ffffffff8b9c2270 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8880757c6100 R12: a14340648bc5456c R13: ffffffff8bebbd40 R14: ffff8880757c6100 R15: 0000000000000005 FS: 00007fa908631700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004afc98 CR3: 00000000b32ba000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_release kernel/locking/lockdep.c:3797 [inline] lock_release+0x36b/0x870 kernel/locking/lockdep.c:4017 __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] _raw_spin_unlock+0x17/0x40 kernel/locking/spinlock.c:184 __run_hrtimer kernel/time/hrtimer.c:1221 [inline] __hrtimer_run_queues+0x2c5/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1685 [inline] RIP: 0010:vprintk_emit+0x549/0x620 kernel/printk/printk.c:1922 RSP: 0018:ffff888099da7a38 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff10 RAX: 0000000000040000 RBX: 1ffffffff11e1259 RCX: ffffc90005ed9000 RDX: 000000000003886c RSI: ffffffff8143f224 RDI: 0000000000000212 RBP: ffff888099da7a70 R08: ffffffff8b9a4af8 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000042 R13: ffff8880b2c92580 R14: 0000000000000212 R15: 0000000000000000 vprintk_func+0x58/0x160 kernel/printk/printk_safe.c:409 printk+0x9e/0xbc kernel/printk/printk.c:1996 valid_args drivers/usb/usbip/vhci_sysfs.c:302 [inline] store_attach+0x6ed/0xa90 drivers/usb/usbip/vhci_sysfs.c:354 dev_attr_store+0x56/0x80 drivers/base/core.c:738 sysfs_kf_write+0x106/0x160 fs/sysfs/file.c:142 kernfs_fop_write+0x289/0x440 fs/kernfs/file.c:316 __vfs_write+0xe4/0x630 fs/read_write.c:480 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4192bf RSP: 002b:00007fa908630b90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00000000004192bf RDX: 0000000000000008 RSI: 00007fa908630be0 RDI: 0000000000000005 RBP: 0000000000000005 R08: 0000000000000000 R09: 00007fa908630b30 R10: 0000000000000000 R11: 0000000000000293 R12: 00000000004afc98 R13: 00007fa908630be0 R14: 0000000000000000 R15: 0000000000022000 Code: 8b 5c 24 68 4c 8b 54 24 60 0f b6 74 24 58 4c 8b 44 24 50 48 8b 54 24 48 e9 4e d5 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 48 63 c2 <39> d6 48 8d 04 80 48 8d 84 c7 88 08 00 00 0f 86 40 02 00 00 83 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN