EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000.
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BUG: KCSAN: data-race in folios_put_refs / need_mlock_drain

write to 0xffff888237c2b4a8 of 1 bytes by task 6537 on cpu 0:
 folio_batch_reinit include/linux/pagevec.h:50 [inline]
 folios_put_refs+0x26d/0x2b0 mm/swap.c:988
 folios_put include/linux/mm.h:1548 [inline]
 mlock_folio_batch+0x3292/0x32c0 mm/mlock.c:209
 mlock_folio+0x1b7/0x210 mm/mlock.c:259
 mlock_vma_folio mm/internal.h:940 [inline]
 __folio_add_file_rmap mm/rmap.c:1494 [inline]
 folio_add_file_rmap_ptes+0x1a0/0x1b0 mm/rmap.c:1511
 set_pte_range+0x206/0x430 mm/memory.c:5135
 filemap_map_order0_folio mm/filemap.c:3758 [inline]
 filemap_map_pages+0x681/0xb30 mm/filemap.c:3812
 do_fault_around mm/memory.c:5350 [inline]
 do_read_fault mm/memory.c:5383 [inline]
 do_fault mm/memory.c:5526 [inline]
 do_pte_missing mm/memory.c:4047 [inline]
 handle_pte_fault mm/memory.c:5889 [inline]
 __handle_mm_fault mm/memory.c:6032 [inline]
 handle_mm_fault+0x113d/0x2ac0 mm/memory.c:6201
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0xf6a/0x2350 mm/gup.c:1491
 populate_vma_page_range mm/gup.c:1929 [inline]
 __mm_populate+0x25b/0x3b0 mm/gup.c:2032
 mm_populate include/linux/mm.h:3386 [inline]
 __do_sys_mlockall mm/mlock.c:769 [inline]
 __se_sys_mlockall+0x36d/0x3d0 mm/mlock.c:745
 __x64_sys_mlockall+0x1f/0x30 mm/mlock.c:745
 x64_sys_call+0x2bf8/0x2dc0 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 0xffff888237c2b4a8 of 1 bytes by task 6291 on cpu 1:
 folio_batch_count include/linux/pagevec.h:56 [inline]
 need_mlock_drain+0x30/0x50 mm/mlock.c:235
 cpu_needs_drain mm/swap.c:779 [inline]
 __lru_add_drain_all+0x22a/0x3f0 mm/swap.c:867
 lru_add_drain_all+0x10/0x20 mm/swap.c:883
 invalidate_bdev+0x47/0x70 block/bdev.c:101
 ext4_put_super+0x571/0x810 fs/ext4/super.c:1356
 generic_shutdown_super+0xe5/0x220 fs/super.c:642
 kill_block_super+0x2a/0x70 fs/super.c:1710
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7368
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473
 deactivate_super+0x9f/0xb0 fs/super.c:506
 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1413
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1420
 task_work_run+0x13a/0x1a0 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xa8/0x120 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x1f -> 0x0a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6291 Comm: syz-executor Not tainted 6.14.0-rc2-syzkaller-00041-g4dc1d1bec898 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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