rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10421 ticks this GP) idle=402/1/0x4000000000000002 softirq=173962/173971 fqs=9 
	(t=10500 jiffies g=239433 q=2941)
rcu: rcu_preempt kthread starved for 10381 jiffies! g239433 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29176    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: 16801 Comm: syz-executor.5 Not tainted 5.5.0-rc1-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+0x509/0xc02 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4488
Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d 99 26 38 08 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b
RSP: 0018:ffffc900022b72c0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13266ab RBX: ffff8880399ca340 RCX: ffffffff815ab3d0
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffffc900022b7308 R08: 1ffffffff1659da4 R09: fffffbfff1659da5
R10: ffff8880399cac28 R11: ffff8880399ca340 R12: ffffffff899a56c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
 rcu_lock_acquire include/linux/rcupdate.h:208 [inline]
 rcu_read_lock include/linux/rcupdate.h:617 [inline]
 list_lru_count_one+0x66/0x370 mm/list_lru.c:191
 list_lru_shrink_count include/linux/list_lru.h:123 [inline]
 count_shadow_nodes+0x79/0x830 mm/workingset.c:437
 do_shrink_slab+0x109/0xad0 mm/vmscan.c:444
 shrink_slab_memcg mm/vmscan.c:596 [inline]
 shrink_slab+0x4fc/0x680 mm/vmscan.c:675
 shrink_node_memcgs mm/vmscan.c:2687 [inline]
 shrink_node+0x46a/0x1ad0 mm/vmscan.c:2791
 shrink_zones mm/vmscan.c:2996 [inline]
 do_try_to_free_pages+0x3ba/0x14f0 mm/vmscan.c:3049
 try_to_free_mem_cgroup_pages+0x30c/0xa70 mm/vmscan.c:3371
 try_charge+0x628/0x14d0 mm/memcontrol.c:2455
 mem_cgroup_try_charge+0x136/0x590 mm/memcontrol.c:6404
 mem_cgroup_try_charge_delay+0x1f/0xa0 mm/memcontrol.c:6419
 do_anonymous_page mm/memory.c:3102 [inline]
 handle_pte_fault mm/memory.c:3943 [inline]
 __handle_mm_fault+0x1f1f/0x3da0 mm/memory.c:4075
 handle_mm_fault+0x3b2/0xa50 mm/memory.c:4112
 faultin_page mm/gup.c:640 [inline]
 __get_user_pages+0x7b2/0x1ac0 mm/gup.c:851
 populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1235
 __mm_populate+0x204/0x380 mm/gup.c:1283
 mm_populate include/linux/mm.h:2347 [inline]
 __do_sys_mlockall mm/mlock.c:823 [inline]
 __se_sys_mlockall mm/mlock.c:799 [inline]
 __x64_sys_mlockall+0x473/0x520 mm/mlock.c:799
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a909
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f3423fbfc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000097
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3423fc06d4
R13: 00000000004c7b8f R14: 00000000004de948 R15: 00000000ffffffff