rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=fd6/1/0x4000000000000002 softirq=52779/52779 fqs=5250 
	(t=10503 jiffies g=80073 q=240)
NMI backtrace for cpu 0
CPU: 0 PID: 9058 Comm: syz-executor.1 Not tainted 5.2.0+ #71
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+0x16f/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x22d/0x25c lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf 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:2736 [inline]
 rcu_sched_clock_irq.cold+0x491/0x8c0 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xd90 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x2ea/0x730 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1068 [inline]
 smp_apic_timer_interrupt+0x10b/0x550 arch/x86/kernel/apic/apic.c:1093
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828
 </IRQ>
RIP: 0010:lruvec_page_state_local include/linux/memcontrol.h:661 [inline]
RIP: 0010:lruvec_lru_size+0x7e/0x3d0 mm/vmscan.c:364
Code: 48 89 45 b8 4c 89 f0 41 83 e6 07 48 c1 e8 03 48 01 d8 48 89 45 d0 41 8d 46 03 88 45 c8 49 8d 87 88 00 00 00 48 89 45 c0 eb 5a <e8> 7d 38 de ff 48 8b 45 c0 48 c1 e8 03 80 3c 18 00 0f 85 a6 02 00
RSP: 0018:ffff88808e696c98 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff81931e95
RDX: 0000000000000002 RSI: 0000000000000001 RDI: 0000000000000004
RBP: ffff88808e696cf0 R08: ffff888095178240 R09: ffffed100c7abd7d
R10: ffffed100c7abd7c R11: ffff888063d5ebe7 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000002 R15: ffff888219f97b40
 get_scan_count mm/vmscan.c:2405 [inline]
 shrink_node_memcg+0x2f5/0x1430 mm/vmscan.c:2462
 shrink_node+0x29b/0x1710 mm/vmscan.c:2707
 shrink_zones mm/vmscan.c:2940 [inline]
 do_try_to_free_pages+0x3cb/0x11e0 mm/vmscan.c:2998
 try_to_free_mem_cgroup_pages+0x314/0xa00 mm/vmscan.c:3300
 try_charge+0x648/0x1430 mm/memcontrol.c:2399
 __memcg_kmem_charge_memcg+0x71/0xf0 mm/memcontrol.c:2781
 memcg_kmem_charge_memcg include/linux/memcontrol.h:1314 [inline]
 memcg_charge_slab mm/slab.h:304 [inline]
 charge_slab_page mm/slab.h:425 [inline]
 kmem_getpages mm/slab.c:1372 [inline]
 cache_grow_begin+0x601/0xc90 mm/slab.c:2599
 fallback_alloc+0x1fd/0x2d0 mm/slab.c:3146
 ____cache_alloc_node+0x1bc/0x1d0 mm/slab.c:3214
 __do_cache_alloc mm/slab.c:3283 [inline]
 slab_alloc mm/slab.c:3311 [inline]
 kmem_cache_alloc+0x1e8/0x700 mm/slab.c:3483
 ext4_alloc_inode+0x1f/0x640 fs/ext4/super.c:1073
 alloc_inode+0x68/0x1e0 fs/inode.c:227
 iget_locked+0x1a6/0x4b0 fs/inode.c:1181
 __ext4_iget+0x265/0x3d10 fs/ext4/inode.c:4866
 ext4_lookup fs/ext4/namei.c:1700 [inline]
 ext4_lookup+0x3b1/0x7a0 fs/ext4/namei.c:1675
 __lookup_slow+0x279/0x500 fs/namei.c:1669
 lookup_slow+0x58/0x80 fs/namei.c:1686
 mountpoint_last fs/namei.c:2663 [inline]
 path_mountpoint+0x5d2/0x1e60 fs/namei.c:2693
 filename_mountpoint+0x190/0x3c0 fs/namei.c:2715
 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2745
 ksys_umount+0x167/0xf00 fs/namespace.c:1680
 __do_sys_umount fs/namespace.c:1706 [inline]
 __se_sys_umount fs/namespace.c:1704 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1704
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c257
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9d 8d fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdb0912d88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 000000000000002a RCX: 000000000045c257
RDX: 0000000000403520 RSI: 0000000000000002 RDI: 00007ffdb0912e30
RBP: 0000000000000743 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000206 R12: 00007ffdb0913ec0
R13: 0000555556fdc940 R14: 0000000000000000 R15: 00007ffdb0913ec0