rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=766/1/0x4000000000000002 softirq=102451/102452 fqs=0 
	(t=11241 jiffies g=155865 q=380)
NMI backtrace for cpu 1
CPU: 1 PID: 8068 Comm: syz-fuzzer Not tainted 5.3.0-rc5-next-20190822 #71
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2795 [inline]
 rcu_sched_clock_irq.cold+0x4fd/0xc0a kernel/rcu/tree.c:2244
 update_process_times+0x32/0x80 kernel/time/timer.c:1724
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1299
 __run_hrtimer kernel/time/hrtimer.c:1493 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1555
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1617
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1093
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:do_user_addr_fault arch/x86/mm/fault.c:1339 [inline]
RIP: 0010:__do_page_fault+0x842/0xdd0 arch/x86/mm/fault.c:1506
Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 ab 04 00 00 48 83 3d 70 a3 c0 07 00 0f 84 8f 03 00 00 e8 b5 e2 3f 00 fb 66 0f 1f 44 00 00 <c7> 45 c0 54 00 00 00 e9 4e fa ff ff e8 9d e2 3f 00 48 8b 45 c8 48
RSP: 0000:ffff88809d157ea0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff88809a820300 RBX: 000000c42014c000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8132508b RDI: ffff88809a820b94
RBP: ffff88809d157f10 R08: ffff88809a820300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000c42014c000
R13: 0000000000000006 R14: ffff88809d157f58 R15: ffff88809d157fe0
 do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1202
RIP: 0033:0x4446e1
Code: 48 83 f8 04 0f 83 c7 01 00 00 48 c1 e0 04 48 8b bc 03 60 04 00 00 48 81 ff 00 80 00 00 73 2b 48 89 ce 48 8b bc 03 58 04 00 00 <48> 89 3e 48 89 8c 03 58 04 00 00 48 8b 8c 03 60 04 00 00 48 01 d1
RSP: 002b:000000c420147ec8 EFLAGS: 00010287
RAX: 0000000000000020 RBX: 00007f6a411a16c8 RCX: 000000c42014c000
RDX: 0000000000002000 RSI: 000000c42014c000 RDI: 0000000000000000
RBP: 000000c420147f20 R08: 000000c42006e2e0 R09: 000000c42014df90
R10: 0000000000000000 R11: 000000c42014dfa0 R12: 0000000000000000
R13: 00000000000000ff R14: 00000000000000ff R15: 000000000000000c