rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=1ba/1/0x4000000000000000 softirq=129041/129042 fqs=4613 
	(t=10500 jiffies g=54565 q=1172699)
NMI backtrace for cpu 1
CPU: 1 PID: 21752 Comm: syz-executor.1 Not tainted 5.8.0-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+0xb3/0xec lib/dump_stack.c:118
 nmi_cpu_backtrace.cold.8+0x3e/0x58 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0xd5/0xec lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0xa2/0xce kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq.cold.94+0x61/0x52d kernel/rcu/tree.c:2519
 update_process_times+0x1f/0x60 kernel/time/timer.c:1710
 tick_sched_handle.isra.23+0x1a/0x50 kernel/time/tick-sched.c:176
 tick_sched_timer+0x6c/0x80 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1e1/0x510 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0xf9/0x210 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x8e/0x2b0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </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]
 sysvec_apic_timer_interrupt+0xc1/0xe0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x30/0x50 kernel/locking/spinlock.c:199
Code: 48 89 fb 48 83 c7 18 e8 ae 83 1f fe 48 89 df e8 76 e0 1f fe e8 c1 d5 29 fe 48 83 3d 91 c6 28 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 06 24 1c fe 65 8b 05 bf a9 fd 7c 85 c0 74 02 5b
RSP: 0000:ffffc90001837e28 EFLAGS: 00000282
RAX: 0000000020c3e8df RBX: ffff88811119cac0 RCX: ffffc90001837dec
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8303d49f
RBP: ffffc90001837e80 R08: 0000000000000001 R09: 0000000000000001
R10: 000000000000000b R11: aeaab19fbcf58636 R12: ffffc90001837e01
R13: ffffc90001837ea0 R14: ffff88811119cac0 R15: 000000000000000b
 spin_unlock_irq include/linux/spinlock.h:404 [inline]
 get_signal+0xa8a/0xcb0 kernel/signal.c:2746
 arch_do_signal+0x2b/0x920 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x181/0x1f0 kernel/entry/common.c:166
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:254
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0033:0x0
Code: Bad RIP value.
RSP: 002b:00007f8691a34a70 EFLAGS: 00010287
RAX: 0000000000000001 RBX: 000000000050a5e0 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f8691a35608
RBP: 000000000078bf00 R08: 00007f8691a34a70 R09: 000000000078bf00
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c3b R14: 00000000004ce958 R15: 00007f8691a356d4