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BUG: KCSAN: data-race in balance_pgdat / shrink_node

write to 0xffff88810036f878 of 8 bytes by task 83 on cpu 0:
 snapshot_refaults mm/vmscan.c:3361 [inline]
 balance_pgdat+0xc27/0xd30 mm/vmscan.c:4135
 kswapd+0x1f0/0x300 mm/vmscan.c:4328
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

read to 0xffff88810036f878 of 8 bytes by task 1115 on cpu 1:
 shrink_node+0x527/0x1190 mm/vmscan.c:3081
 shrink_zones+0x2af/0x490 mm/vmscan.c:3342
 do_try_to_free_pages+0x193/0x6c0 mm/vmscan.c:3397
 try_to_free_pages+0x3a5/0x850 mm/vmscan.c:3632
 __perform_reclaim mm/page_alloc.c:4592 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4613 [inline]
 __alloc_pages_slowpath+0x560/0xbf0 mm/page_alloc.c:5017
 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5388
 alloc_pages+0x382/0x3d0
 __page_cache_alloc+0x4d/0xf0 mm/filemap.c:1022
 page_cache_ra_unbounded+0x1be/0x430 mm/readahead.c:216
 do_page_cache_ra+0xa7/0xc0 mm/readahead.c:269
 do_sync_mmap_readahead+0x31c/0x370 mm/filemap.c:2981
 filemap_fault+0x267/0x9f0 mm/filemap.c:3074
 __do_fault mm/memory.c:3857 [inline]
 do_read_fault mm/memory.c:4172 [inline]
 do_fault mm/memory.c:4300 [inline]
 handle_pte_fault mm/memory.c:4558 [inline]
 __handle_mm_fault mm/memory.c:4693 [inline]
 handle_mm_fault+0xbb7/0x1580 mm/memory.c:4791
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30

value changed: 0x000000000000d441 -> 0x000000000000d463

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1115 Comm: syz-fuzzer Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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