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BUG: KCSAN: data-race in mem_cgroup_protected / mem_cgroup_protected

write to 0xffff8880a92f5120 of 8 bytes by task 17078 on cpu 1:
 mem_cgroup_protected+0x223/0x2a0 mm/memcontrol.c:6437
 shrink_node+0x21e/0xb30 mm/vmscan.c:2775
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_pages+0x1ed/0x4a0 mm/vmscan.c:3296
 __perform_reclaim mm/page_alloc.c:4121 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4142 [inline]
 __alloc_pages_slowpath+0x45c/0xee0 mm/page_alloc.c:4559
 __alloc_pages_nodemask+0x2c8/0x310 mm/page_alloc.c:4773
 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2188
 alloc_pages include/linux/gfp.h:532 [inline]
 __page_cache_alloc mm/filemap.c:981 [inline]
 __page_cache_alloc+0x183/0x1a0 mm/filemap.c:966
 __do_page_cache_readahead+0x13e/0x390 mm/readahead.c:196
 ra_submit mm/internal.h:62 [inline]
 do_sync_mmap_readahead mm/filemap.c:2443 [inline]
 filemap_fault+0xdad/0xf90 mm/filemap.c:2529
 __do_fault+0xae/0x1f0 mm/memory.c:3092
 do_shared_fault mm/memory.c:3544 [inline]
 do_fault mm/memory.c:3622 [inline]
 handle_pte_fault mm/memory.c:3849 [inline]
 __handle_mm_fault+0x2019/0x2c70 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

write to 0xffff8880a92f5120 of 8 bytes by task 1768 on cpu 0:
 mem_cgroup_protected+0x223/0x2a0 mm/memcontrol.c:6437
 shrink_node+0x21e/0xb30 mm/vmscan.c:2775
 kswapd_shrink_node mm/vmscan.c:3547 [inline]
 balance_pgdat+0x60e/0xbf0 mm/vmscan.c:3705
 kswapd+0x35b/0x800 mm/vmscan.c:3956
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1768 Comm: kswapd0 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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