syzbot

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BUG: KCSAN: data-race in folios_put_refs / need_mlock_drain

write to 0xffff888237d2b590 of 1 bytes by task 18238 on cpu 1:
 folio_batch_reinit include/linux/pagevec.h:50 [inline]
 folios_put_refs+0x26d/0x2b0 mm/swap.c:1001
 folios_put include/linux/mm.h:1537 [inline]
 mlock_folio_batch+0x319d/0x31d0 mm/mlock.c:209
 munlock_folio+0xcd/0x130 mm/mlock.c:303
 munlock_vma_folio mm/internal.h:943 [inline]
 __folio_remove_rmap mm/rmap.c:1592 [inline]
 folio_remove_rmap_ptes+0x18f/0x1a0 mm/rmap.c:1609
 try_to_migrate_one+0xb4d/0x12e0 mm/rmap.c:2309
 rmap_walk_anon+0x28f/0x440 mm/rmap.c:2635
 try_to_migrate+0x11f/0x150
 migrate_folio_unmap mm/migrate.c:1327 [inline]
 migrate_pages_batch+0x76a/0x1910 mm/migrate.c:1798
 migrate_pages_sync mm/migrate.c:1964 [inline]
 migrate_pages+0xff1/0x1820 mm/migrate.c:2073
 do_mbind mm/mempolicy.c:1390 [inline]
 kernel_mbind mm/mempolicy.c:1533 [inline]
 __do_sys_mbind mm/mempolicy.c:1607 [inline]
 __se_sys_mbind+0xf76/0x1160 mm/mempolicy.c:1603
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1603
 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

read to 0xffff888237d2b590 of 1 bytes by task 18247 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:792 [inline]
 __lru_add_drain_all+0x22a/0x3f0 mm/swap.c:880
 lru_cache_disable+0x1f/0x30 mm/swap.c:933
 do_mbind mm/mempolicy.c:1307 [inline]
 kernel_mbind mm/mempolicy.c:1533 [inline]
 __do_sys_mbind mm/mempolicy.c:1607 [inline]
 __se_sys_mbind+0x4df/0x1160 mm/mempolicy.c:1603
 __x64_sys_mbind+0x78/0x90 mm/mempolicy.c:1603
 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: 18247 Comm: syz.8.5097 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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