INFO: rcu detected stall in __do_page

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in __do_page_fault kernel				4	1716d	1748d	0/26	auto-closed as invalid on 2019/11/21 04:34
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 ticks this GP) idle=082/1/0x4000000000000002 softirq=88182/88182 fqs=0 
	(t=10954 jiffies g=87869 q=253)
rcu: rcu_preempt kthread starved for 10954 jiffies! g87869 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29264    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4081
 schedule+0xdc/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 9564 Comm: syz-fuzzer Not tainted 5.5.0-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+0x197/0x210 lib/dump_stack.c:118
 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:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc0d kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:do_user_addr_fault arch/x86/mm/fault.c:1339 [inline]
RIP: 0010:__do_page_fault+0x805/0xd80 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 d5 50 5f 08 00 0f 84 8f 03 00 00 e8 d2 42 41 00 fb 66 0f 1f 44 00 00 <c7> 45 c0 54 00 00 00 e9 8b fa ff ff e8 ba 42 41 00 48 8b 45 c8 48
RSP: 0000:ffffc90001f27ea0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880929b6300 RBX: 000000c0001e8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8133e41e RDI: ffff8880929b6b94
RBP: ffffc90001f27f10 R08: ffff8880929b6300 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000c0001e8000
R13: 0000000000000006 R14: ffffc90001f27f58 R15: ffffc90001f27fe0
 do_page_fault+0x38/0x590 arch/x86/mm/fault.c:1530
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x446b3b
Code: 48 83 fa 04 0f 83 fa 01 00 00 48 c1 e2 04 48 8b bc 13 60 04 00 00 48 81 ff 00 80 00 00 73 2b 48 89 f1 48 8b bc 13 58 04 00 00 <48> 89 3e 48 89 8c 13 58 04 00 00 48 8b 8c 13 60 04 00 00 48 01 c8
RSP: 002b:00007ffca7d1d460 EFLAGS: 00010287
RAX: 0000000000002000 RBX: 00007f9c66ca76d0 RCX: 000000c0001e8000
RDX: 0000000000000020 RSI: 000000c0001e8000 RDI: 0000000000000000
RBP: 00007ffca7d1d4d0 R08: 000000c0001ea000 R09: 000000c0001ea000
R10: 000000c00ef56be0 R11: 0000000000dc9fe0 R12: 00000000000000f2
R13: 0000000000000000 R14: 0000000000aac136 R15: 0000000000000000