rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (9427 ticks this GP) idle=626/1/0x4000000000000000 softirq=52225/52226 fqs=5157 
	(t=10502 jiffies g=84461 q=1162)
NMI backtrace for cpu 0
CPU: 0 PID: 26124 Comm: syz-executor.3 Not tainted 5.10.0-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+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 ca 3a 6e f8 48 89 ef e8 52 ef 6e f8 f6 c7 02 75 1a 53 9d <bf> 01 00 00 00 e8 61 5b 63 f8 65 8b 05 8a 05 1a 77 85 c0 74 0a 5b
RSP: 0000:ffffc90000007e10 EFLAGS: 00000286
RAX: 000000000114fd2e RBX: 0000000000000286 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8880b9e26900 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b9e26900
R13: ffff8880b9e26b80 R14: ffffffff850f3110 R15: dffffc0000000000
 __run_hrtimer kernel/time/hrtimer.c:1515 [inline]
 __hrtimer_run_queues+0x5c0/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:4789
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 52 4c 64 f8 e8 7d b2 8e f8 fb bf 01 00 00 00 <e8> 82 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 c0 34 64
RSP: 0000:ffffc90001dbfe68 EFLAGS: 00000202
RAX: 00000000001a0def RBX: ffff888010e69a40 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed10021cd348 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:151 [inline]
RIP: 0010:exit_to_user_mode_prepare+0xdf/0x1a0 kernel/entry/common.c:191
Code: 83 e3 02 75 4b 9c 58 fa f6 c4 02 0f 85 a9 00 00 00 48 8b 5d 00 f7 c3 0e 30 00 00 0f 84 5a ff ff ff e8 65 45 17 00 fb f6 c3 08 <74> ca e8 9a 85 88 07 f6 c7 10 74 c5 4c 89 e7 e8 9d ec 31 00 f6 c3
RSP: 0000:ffffc90001dbff30 EFLAGS: 00000202
RAX: 00000000000136c3 RBX: 0000000000000008 RCX: 1ffffffff19d8e91
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888010e69a40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90001dbff58
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:279
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0033:0x45e159
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3ec2a84cf8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 000000000119bf88 RCX: 000000000045e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000119bf8c
RBP: 000000000119bf80 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007fffa4374b2f R14: 00007f3ec2a859c0 R15: 000000000119bf8c