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BUG: KCSAN: data-race in __lru_add_drain_all / folio_add_lru

read-write to 0xffff888237c266e8 of 1 bytes by task 5014 on cpu 0:
 folio_batch_add include/linux/folio_batch.h:77 [inline]
 __folio_batch_add_and_move mm/swap.c:194 [inline]
 folio_add_lru+0xaa/0x1f0 mm/swap.c:517
 __swap_cache_prepare_and_add+0x440/0x4a0 mm/swap_state.c:504
 swap_cache_alloc_folio+0xa2/0x120 mm/swap_state.c:552
 swap_cluster_readahead+0x25f/0x3c0 mm/swap_state.c:726
 swapin_readahead+0xde/0x840 mm/swap_state.c:901
 do_swap_page+0x31e/0x2180 mm/memory.c:4891
 handle_pte_fault mm/memory.c:6430 [inline]
 __handle_mm_fault mm/memory.c:6565 [inline]
 handle_mm_fault+0xb30/0x2e70 mm/memory.c:6734
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1290/0x1f10 mm/gup.c:1428
 populate_vma_page_range mm/gup.c:1860 [inline]
 __mm_populate+0x242/0x390 mm/gup.c:1963
 do_mlock+0x47c/0x520 mm/mlock.c:659
 __do_sys_mlock mm/mlock.c:667 [inline]
 __se_sys_mlock mm/mlock.c:665 [inline]
 __x64_sys_mlock+0x36/0x50 mm/mlock.c:665
 x64_sys_call+0x1ab3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:150
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237c266e8 of 1 bytes by task 5042 on cpu 1:
 folio_batch_count include/linux/folio_batch.h:56 [inline]
 cpu_needs_drain mm/swap.c:786 [inline]
 __lru_add_drain_all+0x17e/0x450 mm/swap.c:883
 lru_cache_disable+0x1f/0x30 mm/swap.c:936
 do_mbind mm/mempolicy.c:1531 [inline]
 kernel_mbind mm/mempolicy.c:1757 [inline]
 __do_sys_mbind mm/mempolicy.c:1831 [inline]
 __se_sys_mbind+0x6cb/0xdd0 mm/mempolicy.c:1827
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1827
 x64_sys_call+0x2b72/0x3020 arch/x86/include/generated/asm/syscalls_64.h:238
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x06 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 5042 Comm: syz.1.537 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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