syzbot

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BUG: KCSAN: data-race in folios_put_refs / need_mlock_drain

write to 0xffff888237d2b370 of 1 bytes by task 3522 on cpu 1:
 folio_batch_reinit include/linux/pagevec.h:50 [inline]
 folios_put_refs+0x266/0x2b0 mm/swap.c:1033
 folios_put include/linux/mm.h:1549 [inline]
 mlock_folio_batch+0x319d/0x31d0 mm/mlock.c:209
 mlock_new_folio+0x1a3/0x200 mm/mlock.c:282
 folio_add_lru_vma+0x5d/0x60 mm/swap.c:544
 do_anonymous_page mm/memory.c:4621 [inline]
 do_pte_missing mm/memory.c:3962 [inline]
 handle_pte_fault mm/memory.c:5538 [inline]
 __handle_mm_fault mm/memory.c:5681 [inline]
 handle_mm_fault+0x246c/0x2a30 mm/memory.c:5849
 faultin_page mm/gup.c:1194 [inline]
 __get_user_pages+0x499/0x10d0 mm/gup.c:1493
 populate_vma_page_range mm/gup.c:1932 [inline]
 __mm_populate+0x25b/0x3b0 mm/gup.c:2035
 mm_populate include/linux/mm.h:3430 [inline]
 __do_sys_mlockall mm/mlock.c:766 [inline]
 __se_sys_mlockall+0x2c5/0x370 mm/mlock.c:742
 __x64_sys_mlockall+0x1f/0x30 mm/mlock.c:742
 x64_sys_call+0x1e3a/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:152
 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 0xffff888237d2b370 of 1 bytes by task 3533 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:824 [inline]
 __lru_add_drain_all+0x235/0x410 mm/swap.c:912
 lru_cache_disable+0x1f/0x30 mm/swap.c:965
 do_mbind mm/mempolicy.c:1305 [inline]
 kernel_mbind mm/mempolicy.c:1531 [inline]
 __do_sys_mbind mm/mempolicy.c:1605 [inline]
 __se_sys_mbind+0x4df/0x1160 mm/mempolicy.c:1601
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1601
 x64_sys_call+0x2b4d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:238
 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: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3533 Comm: syz.2.37 Not tainted 6.11.0-rc7-syzkaller-00151-gd42f7708e27c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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