rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=27e/1/0x4000000000000002 softirq=10849/10849 fqs=141 
	(t=10500 jiffies g=6289 q=81)
rcu: rcu_preempt kthread starved for 10204 jiffies! g6289 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29104    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: 8245 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: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:arch_static_branch arch/x86/include/asm/jump_label.h:35 [inline]
RIP: 0010:memcg_kmem_enabled include/linux/memcontrol.h:1389 [inline]
RIP: 0010:memcg_kmem_uncharge include/linux/memcontrol.h:1401 [inline]
RIP: 0010:free_thread_stack+0x11f/0x590 kernel/fork.c:284
Code: 3e e8 e5 96 ee ff 48 c1 e8 06 48 83 e0 c0 48 bf 00 00 00 00 00 ea ff ff 48 01 c7 be 03 00 00 00 e8 06 a2 60 00 e9 5d 04 00 00 <e8> 5c 2d 2e 00 48 89 df 31 f6 e8 42 af 6e 00 43 80 3c 2e 00 74 08
RSP: 0018:ffffc90001f676e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff110145ca101 RBX: ffffea00028c3740 RCX: 0000000000040000
RDX: ffffc900020d9000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc90001f67720 R08: dffffc0000000000 R09: fffffbfff120248a
R10: fffffbfff120248a R11: 0000000000000000 R12: ffff8880a2e508a0
R13: dffffc0000000000 R14: 1ffff110145ca114 R15: ffff8880a8e23a68
 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
 __kunmap_atomic include/linux/highmem.h:102 [inline]
 clear_highpage include/linux/highmem.h:215 [inline]
 kernel_init_free_pages mm/page_alloc.c:1125 [inline]
 prep_new_page+0x161/0x2e0 mm/page_alloc.c:2171
 get_page_from_freelist+0x850/0xaa0 mm/page_alloc.c:3695
 __alloc_pages_nodemask+0x264/0x5d0 mm/page_alloc.c:4756
 __alloc_pages include/linux/gfp.h:496 [inline]
 __alloc_pages_node include/linux/gfp.h:509 [inline]
 alloc_pages_vma+0x94a/0xd50 mm/mempolicy.c:2151
 do_huge_pmd_anonymous_page+0x883/0xe50 mm/huge_memory.c:758
 create_huge_pmd mm/memory.c:3836 [inline]
 __handle_mm_fault mm/memory.c:4046 [inline]
 handle_mm_fault+0x2017/0x2890 mm/memory.c:4112
 do_user_addr_fault+0x589/0xaf0 arch/x86/mm/fault.c:1441
 __do_page_fault+0xd3/0x1f0 arch/x86/mm/fault.c:1506
 do_page_fault+0x99/0xb0 arch/x86/mm/fault.c:1530
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0010:__put_user_4+0x1c/0x30 arch/x86/lib/putuser.S:70
Code: 1f 00 c3 90 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 1c 25 c0 1d 02 00 48 8b 9b 90 14 00 00 48 83 eb 03 48 39 d9 73 4a 0f 1f 00 <89> 01 31 c0 0f 1f 00 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 65 48
RSP: 0018:ffffc90001f67e68 EFLAGS: 00010293
RAX: 0000000000000003 RBX: 00007fffffffeffd RCX: 0000000020000840
RDX: dffffc0000000000 RSI: ffff8880a2d0a8f8 RDI: 0000000000000286
RBP: ffffc90001f67ed8 R08: dffffc0000000000 R09: fffffbfff12877ed
R10: fffffbfff12877ed R11: 0000000000000000 R12: 0000000000000005
R13: 0000000020000840 R14: 0000000000000004 R15: 0000000000000000
 __do_sys_socketpair net/socket.c:1624 [inline]
 __se_sys_socketpair net/socket.c:1621 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1621
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a679
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:00007f0489255c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a679
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000840 R11: 0000000000000246 R12: 00007f04892566d4
R13: 00000000004ca783 R14: 00000000004e39b8 R15: 00000000ffffffff