usbtmc 4-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (9950 ticks this GP) idle=8be/1/0x4000000000000000 softirq=9258/9258 fqs=5190 (t=10500 jiffies g=9221 q=4517) NMI backtrace for cpu 1 CPU: 1 PID: 35 Comm: kworker/1:1 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x9a/0xcc lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x30/0x99 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x18f/0x1d0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline] check_cpu_stall kernel/rcu/tree_stall.h:643 [inline] rcu_pending kernel/rcu/tree.c:3751 [inline] rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580 update_process_times+0x13b/0x1c0 kernel/time/timer.c:1782 tick_sched_handle+0x6f/0x130 kernel/time/tick-sched.c:226 tick_sched_timer+0x132/0x210 kernel/time/tick-sched.c:1369 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x18a/0xb00 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x300/0x930 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline] sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191 Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 4a 15 21 f9 48 89 ef e8 f2 c9 21 f9 f6 c7 02 75 1a 53 9d 01 00 00 00 e8 f1 a8 15 f9 65 8b 05 6a 19 d2 77 85 c0 74 0a 5b RSP: 0018:ffffc90000db0b40 EFLAGS: 00000246 RAX: 0000000000053c42 RBX: 0000000000000246 RCX: ffffffff81506cee RDX: 0000000000000000 RSI: ffffffff888af2a0 RDI: ffffffff88dc5000 RBP: ffff88801da04000 R08: 0000000000000001 R09: ffffffff8e0c6917 R10: fffffbfff1c18d22 R11: ffff888146dc1438 R12: ffff888011db5200 R13: ffff888146dc1438 R14: ffff888011db5200 R15: dffffc0000000000 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] dummy_timer+0x113d/0x2d60 drivers/usb/gadget/udc/dummy_hcd.c:1985 call_timer_fn+0x163/0x4b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1462 [inline] __run_timers.part.0+0x52a/0x8b0 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0x9c/0x190 kernel/time/timer.c:1744 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu kernel/softirq.c:420 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 RIP: 0010:lock_release+0x3d5/0x710 kernel/locking/lockdep.c:5450 Code: 15 02 00 00 48 c7 c7 60 f2 8a 88 e8 15 cf dc 06 b8 ff ff ff ff 65 0f c1 05 f8 11 b1 7e 83 f8 01 0f 85 67 01 00 00 ff 34 24 9d <48> b8 00 00 00 00 00 fc ff df 48 01 c5 48 c7 45 00 00 00 00 00 c7 RSP: 0018:ffffc90000e4f058 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1be8a7b6befdad03 RCX: ffffc90000e4f0a8 RDX: 1ffff1100266e4ba RSI: ffffffff888af260 RDI: ffffffff88dc5000 RBP: 1ffff920001c9e0d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 000000000000000c R12: 0000000000000004 R13: 0000000000000005 R14: ffff8880133725d8 R15: ffff888013371c00 local_lock_release include/linux/local_lock_internal.h:48 [inline] idr_preload_end include/linux/idr.h:174 [inline] __kernfs_new_node+0x28f/0x7b0 fs/kernfs/dir.c:638 kernfs_new_node+0x73/0x110 fs/kernfs/dir.c:688 __kernfs_create_file+0x27/0x2e0 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0x1ae/0x4f0 fs/sysfs/file.c:306 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x262/0x9a0 fs/sysfs/group.c:149 internal_create_groups.part.0+0x77/0x100 fs/sysfs/group.c:189 device_add_groups drivers/base/core.c:2204 [inline] device_add_attrs drivers/base/core.c:2363 [inline] device_add+0x787/0x1ad0 drivers/base/core.c:3060 usb_create_ep_devs+0x156/0x260 drivers/usb/core/endpoint.c:196 create_intf_ep_devs.isra.0+0x113/0x190 drivers/usb/core/message.c:1247 usb_set_configuration+0xa40/0x17e0 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x98/0x240 drivers/usb/core/driver.c:293 really_probe+0x1fd/0xc60 drivers/base/dd.c:554 driver_probe_device+0x1ed/0x380 drivers/base/dd.c:740 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:431 __device_attach+0x1db/0x400 drivers/base/dd.c:914 bus_probe_device+0x19d/0x250 drivers/base/bus.c:491 device_add+0x99a/0x1ad0 drivers/base/core.c:3109 usb_new_device.cold+0x650/0xe76 drivers/usb/core/hub.c:2555 hub_port_connect drivers/usb/core/hub.c:5223 [inline] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline] port_event drivers/usb/core/hub.c:5509 [inline] hub_event+0x10a3/0x36b0 drivers/usb/core/hub.c:5591 process_one_work+0x828/0x1390 kernel/workqueue.c:2275 process_scheduled_works kernel/workqueue.c:2337 [inline] worker_thread+0x733/0xf80 kernel/workqueue.c:2423 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: usb_submit_urb failed: -19 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: usb_submit_urb failed: -19 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: usb_submit_urb failed: -19 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: usb_submit_urb failed: -19 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 6-1:0.0: usb_submit_urb failed: -19 usbtmc 2-1:0.0: unknown status received: -71 usbtmc 2-1:0.0: usb_submit_urb failed: -19 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: usb_submit_urb failed: -19 usbtmc 6-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: unknown status received: -71 usbtmc 4-1:0.0: usb_submit_urb failed: -19 usbtmc 5-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: unknown status received: -71 usbtmc 3-1:0.0: usb_submit_urb failed: -19 ---------------- Code disassembly (best guess): 0: f8 clc 1: 5d pop %rbp 2: c3 retq 3: 66 90 xchg %ax,%ax 5: 55 push %rbp 6: 48 89 fd mov %rdi,%rbp 9: 48 83 c7 18 add $0x18,%rdi d: 53 push %rbx e: 48 89 f3 mov %rsi,%rbx 11: 48 8b 74 24 10 mov 0x10(%rsp),%rsi 16: e8 4a 15 21 f9 callq 0xf9211565 1b: 48 89 ef mov %rbp,%rdi 1e: e8 f2 c9 21 f9 callq 0xf921ca15 23: f6 c7 02 test $0x2,%bh 26: 75 1a jne 0x42 28: 53 push %rbx 29: 9d popfq * 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2f: e8 f1 a8 15 f9 callq 0xf915a925 34: 65 8b 05 6a 19 d2 77 mov %gs:0x77d2196a(%rip),%eax # 0x77d219a5 3b: 85 c0 test %eax,%eax 3d: 74 0a je 0x49 3f: 5b pop %rbx