rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=422/1/0x4000000000000002 softirq=51686/51686 fqs=5004 
	(t=10500 jiffies g=64357 q=159440)
NMI backtrace for cpu 0
CPU: 0 PID: 17921 Comm: syz-executor.1 Not tainted 5.7.0-rc5-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+0x1e9/0x30e 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: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:3225 [inline]
 rcu_sched_clock_irq+0x186a/0x1ac0 kernel/rcu/tree.c:2296
 update_process_times+0x12c/0x180 kernel/time/timer.c:1727
 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:1113 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:lock_acquire+0x1c7/0x480 kernel/locking/lockdep.c:4937
Code: c1 e8 03 80 3c 10 00 74 0c 48 c7 c7 30 b9 2b 89 e8 7e c6 58 00 48 83 3d 96 25 d3 07 00 0f 84 8e 02 00 00 48 8b 7c 24 20 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 0f 85 70
RSP: 0000:ffffc90006577b90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1257726 RBX: 1ffff110092e5d98 RCX: ffffffff81597d54
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff16294a5
R10: fffffbfff16294a5 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88804972ecc4 R15: ffff888046766a68
 __might_fault+0xf1/0x150 mm/memory.c:4814
 __copy_to_user include/linux/uaccess.h:99 [inline]
 save_xstate_epilog arch/x86/kernel/fpu/signal.c:95 [inline]
 copy_fpstate_to_sigframe+0x4e5/0x5f0 arch/x86/kernel/fpu/signal.c:207
 get_sigframe+0x387/0x400 arch/x86/kernel/signal.c:272
 __setup_rt_frame+0xaf/0xc30 arch/x86/kernel/signal.c:448
 setup_rt_frame arch/x86/kernel/signal.c:675 [inline]
 handle_signal arch/x86/kernel/signal.c:719 [inline]
 do_signal+0x466/0x610 arch/x86/kernel/signal.c:786
 exit_to_usermode_loop arch/x86/entry/common.c:161 [inline]
 prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:196
 ret_from_intr+0x26/0x2b
RIP: 0033:0x405be9
Code: d0 ff ff ff 01 48 8b 7c 24 28 c7 44 24 34 00 00 00 00 e8 ba ee 01 00 85 c0 75 23 48 6b 44 24 20 18 8b 7c 24 1c 48 03 44 24 38 <48> 8b 48 10 48 8b 50 08 48 8b 30 e8 57 0a 01 00 89 44 24 34 64 f0
RSP: 002b:00007f61d60eba70 EFLAGS: 00010206
RAX: 000000002a3d75b8 RBX: 0000000000000002 RCX: 0000000000424bf0
RDX: d7581b13a7e970c7 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 00007f61d60eba70 R09: 000000000078bf00
R10: 0000000000000008 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000bf9 R14: 00000000004ce1ea R15: 00007f61d60ec6d4