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BUG: KCSAN: data-race in inactive_list_is_low / snapshot_refaults

read to 0xffff888121d51878 of 8 bytes by task 3884 on cpu 1:
 inactive_list_is_low+0x1d4/0x450 mm/vmscan.c:2257
 shrink_list mm/vmscan.c:2280 [inline]
 shrink_node_memcg+0x599/0xf80 mm/vmscan.c:2603
 shrink_node+0x164/0xb30 mm/vmscan.c:2808
 shrink_zones mm/vmscan.c:3025 [inline]
 do_try_to_free_pages+0x242/0x940 mm/vmscan.c:3083
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 try_charge+0x479/0xbe0 mm/memcontrol.c:2572
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6513
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6528
 do_anonymous_page mm/memory.c:3006 [inline]
 handle_pte_fault mm/memory.c:3847 [inline]
 __handle_mm_fault+0x17ab/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+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

write to 0xffff888121d51878 of 8 bytes by task 3894 on cpu 0:
 snapshot_refaults+0x170/0x200 mm/vmscan.c:3046
 do_try_to_free_pages+0x6e8/0x940 mm/vmscan.c:3105
 try_to_free_mem_cgroup_pages+0x1fd/0x4c0 mm/vmscan.c:3383
 try_charge+0x479/0xbe0 mm/memcontrol.c:2572
 __memcg_kmem_charge_memcg+0x4a/0xe0 mm/memcontrol.c:2954
 __memcg_kmem_charge+0xde/0x240 mm/memcontrol.c:2994
 __alloc_pages_nodemask+0x26c/0x310 mm/page_alloc.c:4780
 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2188
 alloc_pages include/linux/gfp.h:532 [inline]
 pipe_write+0x44a/0x970 fs/pipe.c:442
 call_write_iter include/linux/fs.h:1895 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3894 Comm: syz-executor.3 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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