syzbot

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BUG: KCSAN: data-race in mem_cgroup_flush_stats / mem_cgroup_flush_stats_delayed

write to 0xffffffff870ccd68 of 8 bytes by task 72 on cpu 0:
 __mem_cgroup_flush_stats mm/memcontrol.c:648 [inline]
 mem_cgroup_flush_stats+0x97/0x110 mm/memcontrol.c:657
 shrink_node+0x307/0x1200 mm/vmscan.c:3209
 kswapd_shrink_node mm/vmscan.c:4086 [inline]
 balance_pgdat+0x702/0xd30 mm/vmscan.c:4277
 kswapd+0x200/0x330 mm/vmscan.c:4537
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30

read to 0xffffffff870ccd68 of 8 bytes by task 9254 on cpu 1:
 mem_cgroup_flush_stats_delayed+0x21/0x140 mm/memcontrol.c:662
 workingset_refault+0x3c3/0x820 mm/workingset.c:358
 filemap_add_folio+0xe2/0x150 mm/filemap.c:947
 page_cache_ra_unbounded+0x19e/0x2e0 mm/readahead.c:245
 do_page_cache_ra mm/readahead.c:293 [inline]
 page_cache_ra_order+0xd1/0xe0 mm/readahead.c:550
 do_sync_mmap_readahead+0x31e/0x370 mm/filemap.c:3028
 filemap_fault+0x192/0x750 mm/filemap.c:3120
 __do_fault mm/memory.c:4173 [inline]
 do_read_fault mm/memory.c:4518 [inline]
 do_fault+0x500/0xb20 mm/memory.c:4647
 handle_pte_fault mm/memory.c:4911 [inline]
 __handle_mm_fault mm/memory.c:5053 [inline]
 handle_mm_fault+0x889/0xa90 mm/memory.c:5151
 do_user_addr_fault+0x4a1/0x980 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1488 [inline]
 exc_page_fault+0x60/0x160 arch/x86/mm/fault.c:1544
 asm_exc_page_fault+0x22/0x30

value changed: 0x000000010002cc61 -> 0x000000010002cc62

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9254 Comm: dhcpcd Not tainted 6.0.0-rc3-syzkaller-00299-gd895ec7938c4-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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