rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=bae/1/0x4000000000000004 softirq=100430/100433 fqs=0 
	(t=29995 jiffies g=124821 q=561)
rcu: rcu_preempt kthread starved for 29995 jiffies! g124821 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I28896    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x877/0xc50 kernel/sched/core.c:3880
 schedule+0x131/0x1e0 kernel/sched/core.c:3944
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0xef8/0x1790 kernel/rcu/tree.c:1768
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 1206 Comm: syz-executor.3 Not tainted 5.3.0-rc5+ #91
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+0x1d8/0x2f8 lib/dump_stack.c:113
 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:2736 [inline]
 rcu_sched_clock_irq+0xb95/0x16d0 kernel/rcu/tree.c:2183
 update_process_times+0x134/0x190 kernel/time/timer.c:1639
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x403/0x850 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1093
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:ffs arch/x86/include/asm/paravirt.h:778 [inline]
RIP: 0010:__do_softirq+0x1ed/0x7c4 kernel/softirq.c:280
Code: 80 3c 38 00 74 0c 48 c7 c7 90 87 8a 88 e8 5b 78 0c fa 48 83 3d b3 85 ea 00 00 0f 84 dd 05 00 00 0f b7 cb fb 66 0f 1f 44 00 00 <89> 4d 88 b8 ff ff ff ff 0f bc 45 88 41 89 c6 41 ff c6 0f 84 72 01
RSP: 0018:ffff8880aeb09eb8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11150f2 RBX: 0000000000400008 RCX: 0000000000000008
RDX: 0000000080000100 RSI: ffffffff8147c347 RDI: ffffffff87a001bb
RBP: ffff8880aeb09f78 R08: ffffffff817906f4 R09: ffffffff88fbd058
R10: ffffffff88fbd050 R11: ffffffff88fbd043 R12: ffff8880979de080
R13: 0000000000000025 R14: 0000000000000000 R15: dffffc0000000000
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x227/0x230 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 do_IRQ+0x171/0x1d0 arch/x86/kernel/irq.c:259
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:607
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x7c/0x80 kernel/kcov.c:198
Code: 14 95 01 00 00 00 48 c7 04 d1 07 00 00 00 48 89 7c d1 08 48 c1 e0 03 48 83 c8 18 48 89 34 01 4c 89 44 d1 18 49 ff c2 4c 89 11 <c3> 0f 1f 00 41 57 41 56 41 54 53 48 8b 4e 08 48 83 c1 f8 48 89 c8
RSP: 0018:ffff888061d07b68 EFLAGS: 00000297 ORIG_RAX: ffffffffffffffda
RAX: 0000000000000002 RBX: 0000000000004000 RCX: ffffffff810ce331
RDX: ffff8880979de080 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888061d07c60 R08: ffffffff810ce357 R09: ffffed101417d1df
R10: ffffed101417d1df R11: 0000000000000000 R12: ffff8880a0be8ef0
R13: dffffc0000000000 R14: 0000000000004000 R15: ffff8880a0be8ec0
 vcpu_run+0x393/0xd40 arch/x86/kvm/x86.c:8151
 kvm_arch_vcpu_ioctl_run+0x636/0x900 arch/x86/kvm/x86.c:8359
 kvm_vcpu_ioctl+0x6cf/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2765
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:718
 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459879
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb5b9a90c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb5b9a916d4
R13: 00000000004c2c2f R14: 00000000004d62b0 R15: 00000000ffffffff