rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=26e/1/0x4000000000000002 softirq=13082/13084 fqs=28 
	(t=10501 jiffies g=6909 q=260)
rcu: rcu_preempt kthread starved for 10446 jiffies! g6909 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    28984    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8447 Comm: udevd 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+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 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+0xe25/0x1ad0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:mod_memcg_page_state+0x3d/0x190 include/linux/memcontrol.h:653
Code: 27 2e 00 48 83 c3 38 48 89 d8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df 42 80 3c 20 00 74 08 48 89 df e8 e6 8f 6a 00 48 8b 1b <48> 85 db 0f 84 d8 00 00 00 48 c7 c0 60 95 2a 89 48 c1 e8 03 42 80
RSP: 0018:ffffc90001df7808 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffffd40004767df RBX: 0000000000000000 RCX: ffff88808cdc03c0
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00023b3ec0
RBP: ffffc90001df7828 R08: 000000000003a728 R09: ffffed10127c76f1
R10: ffffed10127c76f1 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff888093e3b778
 free_thread_stack+0x168/0x590 kernel/fork.c:280
 release_task_stack kernel/fork.c:440 [inline]
 put_task_stack+0xa3/0x130 kernel/fork.c:451
 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338
 retint_kernel+0x1b/0x2b
RIP: 0010:check_memory_region+0x1/0x2e0 mm/kasan/generic.c:191
Code: 97 96 e5 88 eb 0c 31 db 48 c7 c7 cf 96 e5 88 4c 89 fe 31 c0 e8 63 9a ac ff eb cf cc cc cc cc cc cc cc cc cc cc cc cc cc cc 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 fd 01 00
RSP: 0018:ffffc90001df7a88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88808cdc03c1 RBX: 0000000000000001 RCX: ffffffff815afed8
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8880a7039d28
RBP: ffffc90001df7a98 R08: dffffc0000000000 R09: fffff520003bef5c
R10: fffff520003bef5c R11: 0000000000000000 R12: ffff8880a7039d28
R13: ffff8880a7039d30 R14: 1ffff920003bef5b R15: ffffc90001df7ad8
 atomic64_add_return include/asm-generic/atomic-instrumented.h:881 [inline]
 atomic_long_add_return_release include/asm-generic/atomic-long.h:70 [inline]
 __up_read+0x238/0x740 kernel/locking/rwsem.c:1437
 up_read+0x1d/0x20 kernel/locking/rwsem.c:1577
 anon_vma_unlock_read include/linux/rmap.h:135 [inline]
 validate_mm+0x154/0x9b0 mm/mmap.c:404
 vma_link+0x264/0x290 mm/mmap.c:660
 mmap_region+0x12e1/0x1cb0 mm/mmap.c:1801
 do_mmap+0xabb/0x1120 mm/mmap.c:1549
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x13d/0x1d0 mm/util.c:506
 ksys_mmap_pgoff+0x104/0x560 mm/mmap.c:1601
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f578a1abd0a
Code: b8 ff ff ff ff e9 fa fe ff ff 48 63 fb b8 03 00 00 00 0f 05 b8 ff ff ff ff e9 e6 fe ff ff 90 90 49 89 ca b8 09 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fe c0 2a 00 31 d2 48 29 c2 64
RSP: 002b:00007fffbd5188b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000001def400 RCX: 00007f578a1abd0a
RDX: 0000000000000003 RSI: 0000000000001000 RDI: 0000000000000000
RBP: 0000000000001000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 000000000000000a
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fffbd518e50