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BUG: KCSAN: data-race in get_scan_count / mem_cgroup_update_lru_size

write to 0xffff88812bd50620 of 8 bytes by task 8757 on cpu 1:
 mem_cgroup_update_lru_size+0x75/0xf0 mm/memcontrol.c:1370
 update_lru_size include/linux/mm_inline.h:44 [inline]
 update_lru_sizes mm/vmscan.c:1622 [inline]
 isolate_lru_pages+0x7b8/0x9d0 mm/vmscan.c:1729
 shrink_inactive_list+0x15f/0x610 mm/vmscan.c:1943
 shrink_list mm/vmscan.c:2168 [inline]
 shrink_lruvec+0x38a/0x620 mm/vmscan.c:2463
 shrink_node_memcgs+0x233/0x410 mm/vmscan.c:2643
 shrink_node+0x9ed/0x1230 mm/vmscan.c:2760
 shrink_zones+0x2af/0x490 mm/vmscan.c:2963
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3018
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3257
 __perform_reclaim mm/page_alloc.c:4254 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4275 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4679
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4895
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2275
 alloc_pages include/linux/gfp.h:545 [inline]
 __page_cache_alloc+0x4f/0x120 mm/filemap.c:957
 pagecache_get_page+0x494/0x900 mm/filemap.c:1710
 filemap_fault+0xba4/0x11e0 mm/filemap.c:2591
 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6060
 __do_fault mm/memory.c:3463 [inline]
 do_read_fault+0x41f/0x730 mm/memory.c:3856
 do_fault mm/memory.c:3984 [inline]
 handle_pte_fault mm/memory.c:4224 [inline]
 __handle_mm_fault mm/memory.c:4356 [inline]
 handle_mm_fault+0x14e9/0x1af0 mm/memory.c:4454
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1351 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1404
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

read to 0xffff88812bd50620 of 8 bytes by task 8409 on cpu 0:
 mem_cgroup_get_zone_lru_size include/linux/memcontrol.h:633 [inline]
 lruvec_lru_size mm/vmscan.c:327 [inline]
 get_scan_count+0x2be/0x790 mm/vmscan.c:2328
 shrink_lruvec+0x5a/0x620 mm/vmscan.c:2433
 shrink_node_memcgs+0x233/0x410 mm/vmscan.c:2643
 shrink_node+0x9ed/0x1230 mm/vmscan.c:2760
 shrink_zones+0x2af/0x490 mm/vmscan.c:2963
 do_try_to_free_pages+0x193/0x6e0 mm/vmscan.c:3018
 try_to_free_pages+0x38e/0x8b0 mm/vmscan.c:3257
 __perform_reclaim mm/page_alloc.c:4254 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4275 [inline]
 __alloc_pages_slowpath+0x55f/0x9e0 mm/page_alloc.c:4679
 __alloc_pages_nodemask+0x266/0x380 mm/page_alloc.c:4895
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2275
 alloc_pages include/linux/gfp.h:545 [inline]
 __page_cache_alloc+0x4f/0x120 mm/filemap.c:957
 pagecache_get_page+0x494/0x900 mm/filemap.c:1710
 filemap_fault+0xba4/0x11e0 mm/filemap.c:2591
 ext4_filemap_fault+0x4b/0x60 fs/ext4/inode.c:6060
 __do_fault mm/memory.c:3463 [inline]
 do_read_fault+0x41f/0x730 mm/memory.c:3856
 do_fault mm/memory.c:3984 [inline]
 handle_pte_fault mm/memory.c:4224 [inline]
 __handle_mm_fault mm/memory.c:4356 [inline]
 handle_mm_fault+0x14e9/0x1af0 mm/memory.c:4454
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1351 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1404
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8409 Comm: in:imklog Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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