hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 INFO: task kworker/0:2:3492 blocked for more than 140 seconds. Not tainted 4.14.224-syzkaller #0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 kworker/0:2 D27328 3492 2 0x80000000 Workqueue: usb_hub_wq hub_event hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 drivers/usb/core/urb.c:691 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 drivers/usb/core/message.c:62 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 usb_internal_control_msg drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 drivers/usb/core/message.c:151 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 usb_get_descriptor+0xc0/0x160 drivers/usb/core/message.c:652 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 usb_get_device_descriptor+0x71/0xd0 drivers/usb/core/message.c:924 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hub_port_init+0x629/0x2970 drivers/usb/core/hub.c:4647 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 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 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 kthread+0x30d/0x420 kernel/kthread.c:232 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 Showing all locks held in the system: hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 1 lock held by khungtaskd/1525: #0: (tasklist_lock){.+.?}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 5 locks held by kworker/0:2/3492: #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 ============================================= hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 NMI backtrace for cpu 1 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 CPU: 1 PID: 1525 Comm: khungtaskd Not tainted 4.14.224-syzkaller #0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 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 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 kthread+0x30d/0x420 kernel/kthread.c:232 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 Sending NMI from CPU 1 to CPUs 0: hid-generic 0000:0000:0000.0004: unknown main item tag 0x0 NMI backtrace for cpu 0 CPU: 0 PID: 9205 Comm: kworker/0:4 Not tainted 4.14.224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events uhid_device_add_worker task: ffff888050680100 task.stack: ffff888050688000 RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:2361 [inline] RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:2381 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:2435 [inline] RIP: 0010:__lock_acquire+0xa6f/0x3f20 kernel/locking/lockdep.c:3491 RSP: 0018:ffff8880ba407ab8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff8b3e1fe8 RCX: 0000000000001571 RDX: 1ffffffff17328c9 RSI: 00000000d4ca7e01 RDI: ffff888050680a49 RBP: 0000000000000000 R08: ffffffff8b994648 R09: 00000000000c25f0 R10: ffff888050680a28 R11: ffff888050680100 R12: ffff888050680a40 R13: 0000000000000000 R14: 64ea383107cfa261 R15: ffffffff8beb5d40 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb853e5e010 CR3: 000000009ae1a000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 skb_dequeue+0x1c/0x180 net/core/skbuff.c:2831 garp_queue_xmit net/802/garp.c:261 [inline] garp_join_timer+0xc6/0xf0 net/802/garp.c:413 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 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:ffff88805068f5c8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: ffff888050680100 RBX: 1ffffffff11e1259 RCX: 1ffff1100a0d013a RDX: 0000000000000000 RSI: ffff8880506809d8 RDI: 0000000000000297 RBP: ffff88805068f600 R08: ffffffff8b996290 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000003a R13: ffff8880b2cec3c0 R14: 0000000000000297 R15: 0000000000000000 dev_vprintk_emit+0x1da/0x440 drivers/base/core.c:3004 dev_printk_emit+0xa5/0xd0 drivers/base/core.c:3015 __dev_printk+0xfe/0x250 drivers/base/core.c:3027 dev_err+0xc5/0xf0 drivers/base/core.c:3070 hid_parser_main+0x585/0x9e0 drivers/hid/hid-core.c:609 hid_open_report+0x335/0x630 drivers/hid/hid-core.c:1093 hid_device_probe+0x215/0x2a0 drivers/hid/hid-core.c:2593 really_probe drivers/base/dd.c:409 [inline] driver_probe_device+0x753/0xc80 drivers/base/dd.c:552 __device_attach_driver+0x277/0x360 drivers/base/dd.c:648 bus_for_each_drv+0x13b/0x1a0 drivers/base/bus.c:466 __device_attach+0x259/0x390 drivers/base/dd.c:705 bus_probe_device+0x1db/0x290 drivers/base/bus.c:526 device_add+0xa4f/0x15c0 drivers/base/core.c:1932 hid_add_device+0x302/0x880 drivers/hid/hid-core.c:3066 uhid_device_add_worker+0x3a/0x140 drivers/hid/uhid.c:66 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 Code: ff df 49 0f af ce 48 c1 e9 31 4c 8d 04 cd c0 9a 98 8b 4c 89 c2 48 c1 ea 03 80 3c 02 00 0f 85 17 2d 00 00 48 8b 1c cd c0 9a 98 8b <48> 85 db 74 55 48 83 eb 08 74 4f 48 bd 00 00 00 00 00 fc ff df