rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (9997 ticks this GP) idle=96e/1/0x4000000000000000 softirq=81484/81493 fqs=4927 
	(t=10000 jiffies g=18985 q=22913381)
NMI backtrace for cpu 1
CPU: 1 PID: 9120 Comm: syz-executor.3 Not tainted 5.9.0-rc6-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+0xbb/0xe3 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x18/0x65 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0xef/0x123 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x92/0xc0 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+0x19b/0x58d kernel/rcu/tree.c:2519
 update_process_times+0x24/0x70 kernel/time/timer.c:1710
 tick_sched_handle+0x4b/0x70 kernel/time/tick-sched.c:176
 tick_sched_timer+0xc6/0x120 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x18b/0x3c0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x10b/0x290 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x6e/0x170 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+0xa8/0xe0 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+0x22/0x50 kernel/locking/spinlock.c:199
Code: 2b 4e c1 fd c3 0f 0b 90 48 83 3d 28 e2 06 01 00 74 34 e8 41 48 e7 fd 66 90 48 83 3d af e0 06 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 c4 d4 e4 fd 65 8b 05 fd 7a c2 7c 85 c0 74 01 c3
RSP: 0000:ffffc90009b8bd98 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffff88812ac18fc0 RCX: 0000000000000000
RDX: ffff888111c66080 RSI: ffffffff8121af5c RDI: ffff88812ac18e80
RBP: 000000000000000b R08: ffff888111c66798 R09: ffff888111c66798
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888111c66798
R13: 0000000000000101 R14: ffff888111c66080 R15: 0000000000402660
 spin_unlock_irq include/linux/spinlock.h:404 [inline]
 get_signal+0x975/0xaf0 kernel/signal.c:2760
 arch_do_signal+0x2b/0x830 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x102/0x140 kernel/entry/common.c:192
 irqentry_exit_to_user_mode+0x5/0x20 kernel/entry/common.c:280
 exc_page_fault+0x253/0x7a0 arch/x86/mm/fault.c:1485
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538
RIP: 0033:0x0
Code: Bad RIP value.
RSP: 002b:00007f61a32c2a70 EFLAGS: 00010287
RAX: 0000000000000001 RBX: 000000000050a5e0 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f61a32c3608
RBP: 000000000078bf00 R08: 00007f61a32c2a70 R09: 000000000078bf00
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000c3b R14: 00000000004ce958 R15: 00007f61a32c36d4