rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=bd6/1/0x4000000000000002 softirq=11195/11195 fqs=0 
	(t=10501 jiffies g=6113 q=34)
rcu: rcu_preempt kthread starved for 10502 jiffies! g6113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29048    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 0
CPU: 0 PID: 8144 Comm: blkid Not tainted 5.4.0-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:1514 [inline]
 __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
 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: 28 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 b6 9f 69 00 48 8b 1b <48> 85 db 0f 84 d8 00 00 00 48 c7 c0 20 96 0a 89 48 c1 e8 03 42 80
RSP: 0018:ffffc90002217670 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffffd4000363ce7 RBX: 0000000000000000 RCX: ffff8880a4942100
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0001b1e700
RBP: ffffc90002217690 R08: 000000000003a768 R09: fffffbfff120248a
R10: fffffbfff120248a R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880a791d768
 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_common kernel/sched/core.c:4236 [inline]
 preempt_schedule+0xdb/0x120 kernel/sched/core.c:4261
 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0xcc/0xe0 kernel/locking/spinlock.c:191
 __debug_check_no_obj_freed lib/debugobjects.c:973 [inline]
 debug_check_no_obj_freed+0x505/0x5b0 lib/debugobjects.c:994
 free_pages_prepare mm/page_alloc.c:1175 [inline]
 free_pcp_prepare+0x202/0x4b0 mm/page_alloc.c:1205
 free_unref_page_prepare mm/page_alloc.c:3022 [inline]
 free_unref_page_list+0xa6/0x5e0 mm/page_alloc.c:3091
 release_pages+0x1348/0x14f0 mm/swap.c:861
 free_pages_and_swap_cache+0x96/0xb0 mm/swap_state.c:296
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:184 [inline]
 tlb_flush_mmu+0x755/0x8f0 mm/mmu_gather.c:191
 tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:272
 exit_mmap+0x29b/0x530 mm/mmap.c:3142
 __mmput+0x120/0x3a0 kernel/fork.c:1082
 mmput+0x5d/0x70 kernel/fork.c:1103
 exit_mm+0x50a/0x590 kernel/exit.c:485
 do_exit+0x544/0x2020 kernel/exit.c:784
 do_group_exit+0x15c/0x2b0 kernel/exit.c:895
 __do_sys_exit_group+0x17/0x20 kernel/exit.c:906
 __se_sys_exit_group+0x14/0x20 kernel/exit.c:904
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:904
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f05b35881e8
Code: Bad RIP value.
RSP: 002b:00007fffd879e7c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f05b35881e8
RDX: 0000000000000002 RSI: 000000000000003c RDI: 0000000000000002
RBP: 00007f05b385d840 R08: 00000000000000e7 R09: ffffffffffffffa8
R10: 00007f05b3863740 R11: 0000000000000246 R12: 00007f05b385d840
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000