syzbot

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BUG: KCSAN: data-race in mlock_new_folio / need_mlock_drain

read-write to 0xffff888237d2a210 of 1 bytes by task 5449 on cpu 1:
 folio_batch_add include/linux/pagevec.h:74 [inline]
 mlock_new_folio+0x109/0x1f0 mm/mlock.c:281
 folio_add_lru_vma+0x14d/0x160 mm/swap.c:535
 do_anonymous_page mm/memory.c:4343 [inline]
 do_pte_missing mm/memory.c:3743 [inline]
 handle_pte_fault mm/memory.c:5164 [inline]
 __handle_mm_fault mm/memory.c:5305 [inline]
 handle_mm_fault+0x1da5/0x27c0 mm/memory.c:5470
 faultin_page mm/gup.c:958 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1241
 populate_vma_page_range mm/gup.c:1679 [inline]
 __mm_populate+0x216/0x330 mm/gup.c:1788
 do_mlock+0x3cb/0x4b0 mm/mlock.c:665
 __do_sys_mlock mm/mlock.c:673 [inline]
 __se_sys_mlock mm/mlock.c:671 [inline]
 __x64_sys_mlock+0x36/0x40 mm/mlock.c:671
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237d2a210 of 1 bytes by task 5464 on cpu 0:
 folio_batch_count include/linux/pagevec.h:53 [inline]
 need_mlock_drain+0x30/0x50 mm/mlock.c:236
 cpu_needs_drain mm/swap.c:801 [inline]
 __lru_add_drain_all+0x240/0x420 mm/swap.c:889
 lru_cache_disable+0x1f/0x20 mm/swap.c:942
 do_mbind mm/mempolicy.c:1263 [inline]
 kernel_mbind mm/mempolicy.c:1486 [inline]
 __do_sys_mbind mm/mempolicy.c:1560 [inline]
 __se_sys_mbind+0x487/0x1000 mm/mempolicy.c:1556
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1556
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0d -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5464 Comm: syz-executor.4 Not tainted 6.8.0-rc6-syzkaller-00238-g5ad3cb0ed525 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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