rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=e22/1/0x4000000000000002 softirq=122510/122511 fqs=7 
	(t=10501 jiffies g=146301 q=38)
rcu: rcu_preempt kthread starved for 10488 jiffies! g146301 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29264    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3386 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4082
 schedule+0xdc/0x2b0 kernel/sched/core.c:4156
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline]
 rcu_gp_kthread+0xa10/0x1940 kernel/rcu/tree.c:1818
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 4330 Comm: syz-executor.2 Not tainted 5.5.0-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+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3030 [inline]
 rcu_sched_clock_irq.cold+0x51a/0xc37 kernel/rcu/tree.c:2276
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 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_const_cmp4+0x11/0x20 kernel/kcov.c:274
Code: bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 <e8> ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe
RSP: 0000:ffffc9000959fc38 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000003 RCX: ffffffff83a3664a
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc9000959fc38 R08: 1ffff11015d0707b R09: ffffed1015d0707c
R10: ffffed1015d0707b R11: ffff8880ae8383db R12: 0000000000000000
R13: 00007f908781d5f0 R14: 0000000000000000 R15: ffffc9000959ff58
 check_preemption_disabled lib/smp_processor_id.c:16 [inline]
 debug_smp_processor_id+0x2a/0x18a lib/smp_processor_id.c:57
 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:967 [inline]
 rcu_lockdep_current_cpu_online+0x39/0x130 kernel/rcu/tree.c:958
 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
 rcu_read_lock_held_common+0xbd/0x130 kernel/rcu/update.c:98
 rcu_read_lock_sched_held+0x5b/0xd0 kernel/rcu/update.c:119
 trace_x86_fpu_regs_deactivated arch/x86/include/asm/trace/fpu.h:62 [inline]
 fpregs_deactivate arch/x86/include/asm/fpu/internal.h:522 [inline]
 fpu__drop+0x511/0x5a0 arch/x86/kernel/fpu/core.c:285
 fpu__clear+0x38/0x440 arch/x86/kernel/fpu/core.c:325
 handle_signal arch/x86/kernel/signal.c:764 [inline]
 do_signal+0x9d2/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode+0x321/0x3a0 arch/x86/entry/common.c:195
 ret_from_intr+0x26/0x36
RIP: 0033:0x402b00
Code: 01 49 83 c5 09 45 39 67 1c 7f ce 48 69 db e8 04 00 00 44 89 b3 04 05 a7 00 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 90 <53> 48 8b 76 10 89 fb 64 8b 04 25 d0 ff ff ff 85 c0 74 3d 48 8d 86
RSP: 002b:00007f908781d4b8 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 00007f908781e6d4 RCX: 0000000000415197
RDX: 00007f908781d4c0 RSI: 00007f908781d5f0 RDI: 000000000000000b
RBP: 000000000075bf20 R08: 00007f908781da70 R09: 000000000075bf20
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000bb3 R14: 00000000004cc909 R15: 000000000075bf2c