rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=e96/1/0x4000000000000002 softirq=10674/10678 fqs=42 
	(t=10500 jiffies g=6101 q=111)
rcu: rcu_preempt kthread starved for 10415 jiffies! g6101 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29032    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 8115 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:98
Code: 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 48 89 fb e8 13 00 00 00 48 8b 3d 34 e7 cc 07 48 89 de e8 64 02 3b 00 5b 5d c3 cc <48> 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2
RSP: 0018:ffffc90002467060 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1101507aaa1 RBX: ffffea0002a0b4c0 RCX: 0000000000040000
RDX: ffffc90001ef9000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc900024670a0 R08: 000000000003a768 R09: ffffed10150cb2b7
R10: ffffed10150cb2b7 R11: 0000000000000000 R12: ffff8880a83d55a0
R13: dffffc0000000000 R14: 1ffff1101507aab4 R15: ffff8880a86595a8
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 preempt_schedule_common kernel/sched/core.c:4236 [inline]
 preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261
 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock_irq+0x77/0x80 kernel/locking/spinlock.c:199
 spin_unlock_irq include/linux/spinlock.h:388 [inline]
 rh_call_control drivers/usb/core/hcd.c:738 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:841 [inline]
 usb_hcd_submit_urb+0x9b5/0x1b90 drivers/usb/core/hcd.c:1542
 usb_submit_urb+0x108e/0x1550 drivers/usb/core/urb.c:569
 usb_start_wait_urb+0xd4/0x2f0 drivers/usb/core/message.c:57
 usb_internal_control_msg drivers/usb/core/message.c:101 [inline]
 usb_control_msg+0x24a/0x420 drivers/usb/core/message.c:152
 get_port_status drivers/usb/core/hub.c:569 [inline]
 hub_ext_port_status+0x109/0x6c0 drivers/usb/core/hub.c:586
 hub_port_status drivers/usb/core/hub.c:608 [inline]
 hub_activate+0xd10/0x2110 drivers/usb/core/hub.c:1111
 hub_resume+0x5d/0x350 drivers/usb/core/hub.c:3765
 usb_resume_interface drivers/usb/core/driver.c:1254 [inline]
 usb_resume_both+0x541/0x9e0 drivers/usb/core/driver.c:1414
 usb_runtime_resume+0x21/0x30 drivers/usb/core/driver.c:1871
 __rpm_callback+0x14f/0x4b0 drivers/base/power/runtime.c:357
 rpm_callback drivers/base/power/runtime.c:487 [inline]
 rpm_resume+0xf4c/0x1a00 drivers/base/power/runtime.c:851
 __pm_runtime_resume+0x11b/0x180 drivers/base/power/runtime.c:1078
 pm_runtime_get_sync include/linux/pm_runtime.h:226 [inline]
 usb_autoresume_device+0x23/0x60 drivers/usb/core/driver.c:1601
 usbdev_open+0x140/0x700 drivers/usb/core/devio.c:1024
 chrdev_open+0x509/0x590 fs/char_dev.c:414
 do_dentry_open+0x740/0x10c0 fs/open.c:797
 vfs_open+0x73/0x80 fs/open.c:914
 do_last fs/namei.c:3412 [inline]
 path_openat+0x1397/0x44a0 fs/namei.c:3529
 do_filp_open+0x192/0x3d0 fs/namei.c:3559
 do_sys_open+0x29f/0x560 fs/open.c:1097
 __do_sys_open fs/open.c:1115 [inline]
 __se_sys_open fs/open.c:1110 [inline]
 __x64_sys_open+0x87/0x90 fs/open.c:1110
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x414411
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f7423c037a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000414411
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f7423c03850
RBP: 000000000075bf20 R08: 000000000000000f R09: 0000000000000000
R10: 00007f7423c049d0 R11: 0000000000000293 R12: 00007f7423c046d4
R13: 00000000004cae46 R14: 00000000004e4348 R15: 00000000ffffffff