rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=6d2/1/0x4000000000000002 softirq=12813/12829 fqs=0 
	(t=10500 jiffies g=7505 q=406)
rcu: rcu_preempt kthread starved for 10500 jiffies! g7505 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: 8747 Comm: syz-executor.2 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+0x123/0x190 include/linux/memcontrol.h:653
Code: e8 22 8f 6a 00 48 83 3d b2 fd e1 07 00 74 70 e8 c3 26 2e 00 4c 89 ff 57 9d 0f 1f 44 00 00 e8 44 cf 33 00 eb 43 e8 ad 26 2e 00 <eb> 3c e8 d6 cc 33 00 48 c7 c0 68 95 2a 89 48 c1 e8 03 42 80 3c 20
RSP: 0018:ffffc90001f57800 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff814897d3 RBX: 0000000000000000 RCX: ffff8880a78ba3c0
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00025c6b00
RBP: ffffc90001f57820 R08: 000000000003a728 R09: ffffed101460bb41
R10: ffffed101460bb41 R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880a305d9f8
 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
 schedule+0x181/0x210 kernel/sched/core.c:4155
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
 mutex_optimistic_spin+0x445/0x480 kernel/locking/mutex.c:707
 __mutex_lock_common+0x2e7/0x2e10 kernel/locking/mutex.c:959
 __mutex_lock kernel/locking/mutex.c:1103 [inline]
 mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 cgrp_css_online+0x96/0x340 net/core/netprio_cgroup.c:157
 online_css+0xbb/0x230 kernel/cgroup/cgroup.c:5047
 css_create kernel/cgroup/cgroup.c:5118 [inline]
 cgroup_apply_control_enable+0xd46/0x1240 kernel/cgroup/cgroup.c:3064
 cgroup_mkdir+0xeb8/0x1280 kernel/cgroup/cgroup.c:5327
 kernfs_iop_mkdir+0x133/0x270 fs/kernfs/dir.c:1127
 vfs_mkdir+0x43f/0x610 fs/namei.c:3819
 do_mkdirat+0x1d7/0x320 fs/namei.c:3842
 __do_sys_mkdir fs/namei.c:3858 [inline]
 __se_sys_mkdir fs/namei.c:3856 [inline]
 __x64_sys_mkdir+0x60/0x70 fs/namei.c:3856
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a367
Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d c2 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd8856c098 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045a367
RDX: 00007ffd8856c0f3 RSI: 00000000000001ff RDI: 00007ffd8856c0e0
RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000013
R10: 0000000000000075 R11: 0000000000000202 R12: 0000000000416a50
R13: 00007ffd8856c508 R14: 0000000000000000 R15: 00007ffd8856c0e0