rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=4a6/1/0x4000000000000002 softirq=11646/11646 fqs=15 
	(t=10500 jiffies g=6077 q=703)
rcu: rcu_preempt kthread starved for 10468 jiffies! g6077 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29032    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: 8163 Comm: syz-executor.0 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: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 f2 9a 69 00 48 83 3d 12 21 c2 07 00 74 70 e8 63 25 2e 00 4c 89 ff 57 9d 0f 1f 44 00 00 e8 24 c1 33 00 eb 43 e8 4d 25 2e 00 <eb> 3c e8 b6 be 33 00 48 c7 c0 28 95 0a 89 48 c1 e8 03 42 80 3c 20
RSP: 0018:ffffc900024a7978 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff81487433 RBX: 0000000000000000 RCX: ffff8880a87ae100
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea0002810740
RBP: ffffc900024a7998 R08: 000000000003a728 R09: ffffed10128cd6cf
R10: ffffed10128cd6cf R11: 0000000000000000 R12: dffffc0000000000
R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff88809466b668
 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:memcg_charge_kernel_stack kernel/fork.c:421 [inline]
RIP: 0010:dup_task_struct+0x27e/0x910 kernel/fork.c:876
Code: 66 90 66 2e 0f 1f 84 00 00 00 00 00 e8 eb 21 2e 00 49 ff c4 49 83 c6 08 48 b9 00 00 00 00 00 fc ff df 41 80 7c 0d 00 00 75 c2 <49> 8b 1f 4c 01 f3 48 89 d8 48 c1 e8 03 80 3c 08 00 74 08 48 89 df
RSP: 0018:ffffc900024a7bf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11012e38c0b RBX: 1ffff11012e38e85 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880971c7428
RBP: ffffc900024a7c48 R08: dffffc0000000000 R09: fffffbfff121fb95
R10: fffffbfff121fb95 R11: 0000000000000000 R12: 0000000000000001
R13: 1ffff11011cbb434 R14: 0000000000000000 R15: ffff88808e5da1a0
 copy_process+0x4c5/0x5510 kernel/fork.c:1911
 _do_fork+0x13e/0x660 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x20b/0x250 kernel/fork.c:2557
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d049
Code: ff 48 85 f6 0f 84 d7 8c fb ff 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 0f 8c ae 8c fb ff 74 01 c3 31 ed 48 f7 c7 00 00 01 00 75
RSP: 002b:00007ffd63ef1a08 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fb8c9790700 RCX: 000000000045d049
RDX: 00007fb8c97909d0 RSI: 00007fb8c978fdb0 RDI: 00000000003d0f00
RBP: 00007ffd63ef1c20 R08: 00007fb8c9790700 R09: 00007fb8c9790700
R10: 00007fb8c97909d0 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffd63ef1abf R14: 00007fb8c97909c0 R15: 000000000075bf2c