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BUG: KCSAN: data-race in mem_cgroup_protected / mem_cgroup_protected

write to 0xffff8880a6849120 of 8 bytes by task 7426 on cpu 0:
 mem_cgroup_protected+0x223/0x2a0 mm/memcontrol.c:6431
 shrink_node+0x21e/0xb30 mm/vmscan.c:2777
 shrink_zones mm/vmscan.c:3027 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3085
 try_to_free_pages+0x1ed/0x4a0 mm/vmscan.c:3298
 __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:509 [inline]
 __page_cache_alloc mm/filemap.c:980 [inline]
 __page_cache_alloc+0x183/0x1a0 mm/filemap.c:965
 pagecache_get_page+0x24b/0x760 mm/filemap.c:1670
 filemap_fault+0xbfb/0xf90 mm/filemap.c:2530
 ext4_filemap_fault+0x59/0x72 fs/ext4/inode.c:6292
 __do_fault+0xae/0x1f0 mm/memory.c:3092
 do_read_fault mm/memory.c:3489 [inline]
 do_fault mm/memory.c:3618 [inline]
 handle_pte_fault mm/memory.c:3849 [inline]
 __handle_mm_fault+0x1fa0/0x2cb0 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010

write to 0xffff8880a6849120 of 8 bytes by task 7440 on cpu 1:
 mem_cgroup_protected+0x223/0x2a0 mm/memcontrol.c:6431
 shrink_node+0x21e/0xb30 mm/vmscan.c:2777
 shrink_zones mm/vmscan.c:3027 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3085
 try_to_free_pages+0x1ed/0x4a0 mm/vmscan.c:3298
 __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:509 [inline]
 __page_cache_alloc mm/filemap.c:980 [inline]
 __page_cache_alloc+0x183/0x1a0 mm/filemap.c:965
 pagecache_get_page+0x24b/0x760 mm/filemap.c:1670
 filemap_fault+0xbfb/0xf90 mm/filemap.c:2530
 ext4_filemap_fault+0x59/0x72 fs/ext4/inode.c:6292
 __do_fault+0xae/0x1f0 mm/memory.c:3092
 do_read_fault mm/memory.c:3489 [inline]
 do_fault mm/memory.c:3618 [inline]
 handle_pte_fault mm/memory.c:3849 [inline]
 __handle_mm_fault+0x1fa0/0x2cb0 mm/memory.c:3973

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7440 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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