mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=90a/1/0x4000000000000000 softirq=49656/49657 fqs=0 (t=10503 jiffies g=85317 q=670) NMI backtrace for cpu 0 CPU: 0 PID: 55 Comm: kworker/u4:3 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound call_usermodehelper_exec_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:342 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline] check_cpu_stall kernel/rcu/tree_stall.h:700 [inline] rcu_pending kernel/rcu/tree.c:3922 [inline] rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641 update_process_times+0x16d/0x200 kernel/time/timer.c:1785 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:191 Code: 74 24 10 e8 8a 0a 2e f8 48 89 ef e8 32 80 2e f8 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 f3 5d 22 f8 65 8b 05 9c d8 d4 76 85 c0 74 0a 5b 5d c3 e8 d0 b8 RSP: 0018:ffffc90000007b28 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff1fa6ae2 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001 RBP: ffff888021c28000 R08: 0000000000000001 R09: ffffffff8fcd599f R10: 0000000000000001 R11: ffffc90014504000 R12: ffff888146b09440 R13: ffff888142b90100 R14: dffffc0000000000 R15: ffff888027844000 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] dummy_timer+0x12f6/0x32b0 drivers/usb/gadget/udc/dummy_hcd.c:2001 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 do_softirq.part.0+0xde/0x130 kernel/softirq.c:459 do_softirq kernel/softirq.c:451 [inline] __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:383 local_bh_enable include/linux/bottom_half.h:32 [inline] fpregs_unlock arch/x86/include/asm/fpu/api.h:78 [inline] fpu_clone+0x152/0x600 arch/x86/kernel/fpu/core.c:279 dup_task_struct kernel/fork.c:884 [inline] copy_process+0x986/0x74d0 kernel/fork.c:1952 kernel_clone+0xe7/0xac0 kernel/fork.c:2509 kernel_thread+0xb5/0xf0 kernel/fork.c:2561 call_usermodehelper_exec_work kernel/umh.c:174 [inline] call_usermodehelper_exec_work+0xcc/0x180 kernel/umh.c:160 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 6-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 3-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71 mceusb 5-1:0.0: Error: urb status = -71 mceusb 4-1:0.0: Error: urb status = -71