rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=782/1/0x4000000000000004 softirq=147569/147573 fqs=0 
	(t=29999 jiffies g=141585 q=378)
rcu: rcu_preempt kthread starved for 29999 jiffies! g141585 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29016    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x87f/0xcd0 kernel/sched/core.c:4081
 schedule+0x188/0x210 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+0xe0d/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: 3582 Comm: syz-executor.4 Not tainted 5.5.0-rc7-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+0xaa/0x190 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16f/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+0x1521/0x1ab0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:171 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641
 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
RIP: 0010:ffs arch/x86/include/asm/paravirt.h:762 [inline]
RIP: 0010:__do_softirq+0x1ed/0x7bd kernel/softirq.c:280
Code: 80 3c 38 00 74 0c 48 c7 c7 38 91 0a 89 e8 ab bc 92 f9 48 83 3d 5b 8f ea 00 00 0f 84 d6 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 6b 01
RSP: 0018:ffffc90000007ec0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1215227 RBX: 0000000000400008 RCX: 0000000000000008
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888096c0ccc4
RBP: ffffc90000007f80 R08: ffff888096c0ccd8 R09: fffffbfff13cd145
R10: fffffbfff13cd145 R11: 0000000000000000 R12: ffff888096c0c480
R13: dffffc0000000000 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:536 [inline]
 do_IRQ+0x100/0x1e0 arch/x86/kernel/irq.c:263
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:607
 </IRQ>
RIP: 0010:rcu_lock_release+0x0/0x30 include/linux/rcupdate.h:212
Code: f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 68 7d 04 0d 81 e8 42 63 4e 00 48 83 c4 08 5b 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 53 48 89 fb e8 33 7b 69 00 e8 2e 7b 69 00 48 89 df 48
RSP: 0018:ffffc90002857c68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffda
RAX: ffffffff810bd232 RBX: 0000000000000008 RCX: 0000000000040000
RDX: ffffc90013334000 RSI: 000000000003ffff RDI: ffffc90002b42e18
RBP: ffffc90002857d28 R08: ffffffff810bd227 R09: ffffed1012d81891
R10: ffffed1012d81891 R11: 0000000000000000 R12: ffff8880962f1280
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90002b42e18
 kvm_arch_vcpu_ioctl_run+0x636/0x900 arch/x86/kvm/x86.c:8561
 kvm_vcpu_ioctl+0x6cf/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2847
 do_vfs_ioctl+0x6e2/0x19b0 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:749 [inline]
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:754
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b349
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f94aa2ffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f94aa3006d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000039d R14: 00000000004c4dc8 R15: 000000000075bf2c