rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=b2e/1/0x4000000000000002 softirq=230344/230347 fqs=0 
	(t=30004 jiffies g=376161 q=260)
NMI backtrace for cpu 1
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.4.0-rc8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rcu_gp process_srcu
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:2795 [inline]
 rcu_sched_clock_irq+0xe22/0x1ae0 kernel/rcu/tree.c:2244
 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:1299
 __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:830
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xb7/0x140 kernel/sched/core.c:4328
Code: fe f9 43 80 3c 37 00 74 0c 48 c7 c7 00 90 8a 88 e8 fe 45 32 fa 48 83 3d 76 1c 10 01 00 0f 84 82 00 00 00 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 3f ee ff ff 43 80 3c 34 00 74 0c 48 c7 c7 f8 8f
RSP: 0018:ffff8880a9a27a88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a9a06e54 RBX: 0000000000000000 RCX: ffffffff81591107
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880a9a06e04
RBP: ffff8880a9a27aa8 R08: ffff8880a9a06e18 R09: fffffbfff12bc2a2
R10: fffffbfff12bc2a2 R11: 0000000000000000 R12: 1ffffffff11151ff
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffffffff1115200
 retint_kernel+0x1b/0x2b
RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:123 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x14/0x90 kernel/kcov.c:189
Code: 49 ff c1 4d 89 0a c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 4c 8b 04 24 65 48 8b 04 25 c0 fd 01 00 65 8b 0d 48 83 8e 7e <f7> c1 00 01 1f 00 75 64 8b 88 f8 12 00 00 83 f9 03 75 59 4c 8b 90
RSP: 0018:ffff8880a9a27b68 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff02
RAX: ffff8880a9a065c0 RBX: 0000000000000000 RCX: 0000000080000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffff8880a9a27b80 R08: ffffffff877453ad R09: fffffbfff111fd0a
R10: fffffbfff111fd0a R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff88be61b0 R15: 0000000000000000
 srcu_readers_lock_idx kernel/rcu/srcutree.c:252 [inline]
 srcu_readers_active_idx_check kernel/rcu/srcutree.c:321 [inline]
 try_check_zero+0x2b8/0x380 kernel/rcu/srcutree.c:701
 srcu_advance_state kernel/rcu/srcutree.c:1142 [inline]
 process_srcu+0x1b7/0xd20 kernel/rcu/srcutree.c:1237
 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352