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BUG: KCSAN: data-race in get_scan_count / mem_cgroup_update_lru_size

write to 0xffff88812bd0f9f8 of 8 bytes by task 2462 on cpu 1:
 mem_cgroup_update_lru_size+0x53/0xf0 mm/memcontrol.c:1275
 update_lru_size include/linux/mm_inline.h:44 [inline]
 move_pages_to_lru+0x2f5/0x9d0 mm/vmscan.c:1872
 shrink_inactive_list+0x29b/0x610 mm/vmscan.c:1969
 shrink_list mm/vmscan.c:2173 [inline]
 shrink_lruvec+0x38a/0x620 mm/vmscan.c:2467
 shrink_node_memcgs+0x1be/0x360 mm/vmscan.c:2656
 shrink_node+0x94e/0x1170 mm/vmscan.c:2770
 kswapd_shrink_node mm/vmscan.c:3517 [inline]
 balance_pgdat+0x675/0xbb0 mm/vmscan.c:3675
 kswapd+0x1ef/0x370 mm/vmscan.c:3932
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff88812bd0f9f8 of 8 bytes by task 26433 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:523 [inline]
 lruvec_lru_size mm/vmscan.c:332 [inline]
 get_scan_count+0x2b3/0x770 mm/vmscan.c:2333
 shrink_lruvec+0x5a/0x620 mm/vmscan.c:2437
 shrink_node_memcgs+0x1be/0x360 mm/vmscan.c:2656
 shrink_node+0x94e/0x1170 mm/vmscan.c:2770
 shrink_zones+0x2af/0x490 mm/vmscan.c:2973
 do_try_to_free_pages+0x1b4/0x6c0 mm/vmscan.c:3026
 try_to_free_pages+0x38d/0x8d0 mm/vmscan.c:3265
 __perform_reclaim mm/page_alloc.c:4223 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4244 [inline]
 __alloc_pages_slowpath+0x50a/0x970 mm/page_alloc.c:4650
 __alloc_pages_nodemask+0x235/0x390 mm/page_alloc.c:4863
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2292
 alloc_pages include/linux/gfp.h:545 [inline]
 __vmalloc_area_node mm/vmalloc.c:2475 [inline]
 __vmalloc_node_range+0x2bf/0x530 mm/vmalloc.c:2541
 vmalloc_user+0x55/0x60 mm/vmalloc.c:2653
 vb2_vmalloc_alloc+0x8f/0x120 drivers/media/common/videobuf2/videobuf2-vmalloc.c:48
 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:215 [inline]
 __vb2_queue_alloc+0x4fe/0xaf0 drivers/media/common/videobuf2/videobuf2-core.c:370
 vb2_core_create_bufs+0x334/0x570 drivers/media/common/videobuf2/videobuf2-core.c:849
 vb2_create_bufs+0x419/0x560 drivers/media/common/videobuf2/videobuf2-v4l2.c:750
 vb2_ioctl_create_bufs+0x2b3/0x310 drivers/media/common/videobuf2/videobuf2-v4l2.c:955
 v4l_create_bufs+0x15e/0x1b0 drivers/media/v4l2-core/v4l2-ioctl.c:2087
 __video_do_ioctl+0x65b/0x870 drivers/media/v4l2-core/v4l2-ioctl.c:2986
 video_usercopy+0x6da/0xfc0 drivers/media/v4l2-core/v4l2-ioctl.c:3298
 video_ioctl2+0x25/0x30 drivers/media/v4l2-core/v4l2-ioctl.c:3335
 v4l2_ioctl+0xc2/0xd0 drivers/media/v4l2-core/v4l2-dev.c:360
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl fs/ioctl.c:753 [inline]
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl+0xc9/0x130 fs/ioctl.c:760
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26433 Comm: syz-executor.4 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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