syzbot

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BUG: KCSAN: data-race in mlock_new_folio / need_mlock_drain

read-write to 0xffff888237d2b5a0 of 1 bytes by task 14231 on cpu 1:
 folio_batch_add include/linux/pagevec.h:77 [inline]
 mlock_new_folio+0x114/0x200 mm/mlock.c:280
 folio_add_lru_vma+0x5d/0x60 mm/swap.c:530
 do_anonymous_page mm/memory.c:4831 [inline]
 do_pte_missing mm/memory.c:3963 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0x24bf/0x2aa0 mm/memory.c:6077
 faultin_page mm/gup.c:1187 [inline]
 __get_user_pages+0xf2c/0x2670 mm/gup.c:1485
 populate_vma_page_range mm/gup.c:1923 [inline]
 __mm_populate+0x25b/0x3b0 mm/gup.c:2026
 mm_populate include/linux/mm.h:3383 [inline]
 __do_sys_mremap mm/mremap.c:1187 [inline]
 __se_sys_mremap+0xdf7/0xec0 mm/mremap.c:987
 __x64_sys_mremap+0x67/0x80 mm/mremap.c:987
 x64_sys_call+0x27e8/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:26
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d2b5a0 of 1 bytes by task 14239 on cpu 0:
 folio_batch_count include/linux/pagevec.h:56 [inline]
 need_mlock_drain+0x30/0x50 mm/mlock.c:235
 cpu_needs_drain mm/swap.c:778 [inline]
 __lru_add_drain_all+0x22a/0x3f0 mm/swap.c:866
 lru_cache_disable+0x1f/0x30 mm/swap.c:919
 do_pages_move mm/migrate.c:2300 [inline]
 kernel_move_pages mm/migrate.c:2554 [inline]
 __do_sys_move_pages mm/migrate.c:2568 [inline]
 __se_sys_move_pages+0x2a6/0x14b0 mm/migrate.c:2563
 __x64_sys_move_pages+0x78/0x90 mm/migrate.c:2563
 x64_sys_call+0x179b/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:280
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14239 Comm: syz.3.3912 Not tainted 6.12.0-syzkaller-00971-g158f238aa69d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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