rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=47a/1/0x4000000000000000 softirq=241188/241188 fqs=4567 
	(t=10500 jiffies g=307529 q=137702)
NMI backtrace for cpu 1
CPU: 1 PID: 9130 Comm: syz-executor.4 Not tainted 5.8.0-rc3-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+0x1f0/0x31e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:320
 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 rcu_pending kernel/rcu/tree.c:3489 [inline]
 rcu_sched_clock_irq+0x1928/0x1eb0 kernel/rcu/tree.c:2504
 update_process_times+0x12c/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:176 [inline]
 tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x112/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0xd0 kernel/locking/spinlock.c:191
Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 f0 c7 2b 89 e8 ea 7c 94 f9 48 83 3d d2 c9 0c 01 00 74 2c 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 cc 8b 31 f9 65 8b 05 d1 ff e2 77
RSP: 0018:ffffc90000da8d10 EFLAGS: 00000282
RAX: 1ffffffff12578fe RBX: ffff8880ae925400 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff16334b7
R10: fffffbfff16334b7 R11: 0000000000000000 R12: 00000000ffffffff
R13: 1ffff11002161904 R14: 0000000000000282 R15: ffff8880ae925400
 __mod_timer+0xf00/0x14a0 kernel/time/timer.c:1057
 call_timer_fn+0x91/0x160 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers+0x736/0x930 kernel/time/timer.c:1773
 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786
 __do_softirq+0x268/0x80c kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0xe0/0x1a0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:417
 irq_exit_rcu+0x6/0x50 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x117/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x57/0x80 kernel/locking/spinlock.c:199
Code: 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 00 c8 2b 89 e8 6a 7c 94 f9 48 83 3d 62 c9 0c 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 4f 8b 31 f9 65 8b 05 54 ff e2 77 85 c0 74 02 5b
RSP: 0018:ffffc9001732f540 EFLAGS: 00000282
RAX: 1ffffffff1257900 RBX: ffff8880ae9358c0 RCX: dffffc0000000000
RDX: 0000000040000002 RSI: 0000000000000000 RDI: ffffffff881efe6f
RBP: ffffc9001732f5a0 R08: ffffffff817a1eef R09: ffffed1015d26cf4
R10: ffffed1015d26cf4 R11: 0000000000000000 R12: ffff8880ae9358c0
R13: ffff88802b7ec0c0 R14: ffff8880ae936308 R15: dffffc0000000000
 finish_task_switch+0x24f/0x550 kernel/sched/core.c:3292
 context_switch kernel/sched/core.c:3456 [inline]
 __schedule+0x7db/0xc40 kernel/sched/core.c:4178
 preempt_schedule_irq+0xca/0x150 kernel/sched/core.c:4436
 idtentry_exit_cond_resched arch/x86/entry/common.c:621 [inline]
 idtentry_exit_cond_rcu+0xcb/0xe0 arch/x86/entry/common.c:668
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:760 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:782 [inline]
RIP: 0010:lock_acquire+0x9e/0x720 kernel/locking/lockdep.c:4954
Code: 3c 10 00 74 16 48 c7 c7 e8 c7 2b 89 e8 2b ef 59 00 48 ba 00 00 00 00 00 fc ff df 48 83 3d 01 3c d2 07 00 0f 84 20 06 00 00 9c <58> 0f 1f 44 00 00 48 89 44 24 10 48 c7 c0 f8 c7 2b 89 48 c1 e8 03
RSP: 0018:ffffc9001732f730 EFLAGS: 00000282
RAX: 1ffffffff12578fd RBX: 1ffff110056fd931 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff892e9490
RBP: ffff88802b7ec0c0 R08: 0000000000000000 R09: 0000000000000000
R10: fffff52002e65f17 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88802b7ec98c R14: ffffffff892e9490 R15: 0000000000000000