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BUG: KCSAN: data-race in folios_put_refs / need_mlock_drain

write to 0xffff888237d2b3c0 of 1 bytes by task 8984 on cpu 1:
 folio_batch_reinit include/linux/pagevec.h:50 [inline]
 folios_put_refs+0x266/0x2b0 mm/swap.c:1018
 folios_put include/linux/mm.h:1572 [inline]
 mlock_folio_batch+0x31af/0x31e0 mm/mlock.c:209
 munlock_folio+0xcd/0x130 mm/mlock.c:303
 munlock_vma_folio mm/internal.h:879 [inline]
 __folio_remove_rmap mm/rmap.c:1578 [inline]
 folio_remove_rmap_ptes+0x220/0x230 mm/rmap.c:1595
 zap_present_folio_ptes mm/memory.c:1505 [inline]
 zap_present_ptes mm/memory.c:1564 [inline]
 zap_pte_range mm/memory.c:1606 [inline]
 zap_pmd_range mm/memory.c:1724 [inline]
 zap_pud_range mm/memory.c:1753 [inline]
 zap_p4d_range mm/memory.c:1774 [inline]
 unmap_page_range+0xfea/0x21f0 mm/memory.c:1795
 unmap_single_vma+0x142/0x1d0 mm/memory.c:1841
 unmap_vmas+0x18d/0x2b0 mm/memory.c:1885
 exit_mmap+0x18f/0x710 mm/mmap.c:3341
 __mmput+0x28/0x1b0 kernel/fork.c:1343
 mmput+0x4c/0x60 kernel/fork.c:1365
 exit_mm+0xe4/0x190 kernel/exit.c:566
 do_exit+0x55e/0x1720 kernel/exit.c:864
 do_group_exit+0x142/0x150 kernel/exit.c:1026
 __do_sys_exit_group kernel/exit.c:1037 [inline]
 __se_sys_exit_group kernel/exit.c:1035 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1035
 x64_sys_call+0x2d5d/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:232
 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 0xffff888237d2b3c0 of 1 bytes by task 7511 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:806 [inline]
 __lru_add_drain_all+0x235/0x410 mm/swap.c:894
 lru_add_drain_all+0x10/0x20 mm/swap.c:910
 invalidate_bdev+0x47/0x70 block/bdev.c:100
 ext4_put_super+0x51b/0x7e0 fs/ext4/super.c:1345
 generic_shutdown_super+0xde/0x210 fs/super.c:642
 kill_block_super+0x2a/0x70 fs/super.c:1685
 ext4_kill_sb+0x44/0x80 fs/ext4/super.c:7285
 deactivate_locked_super+0x7d/0x1c0 fs/super.c:473
 deactivate_super+0x9f/0xb0 fs/super.c:506
 cleanup_mnt+0x268/0x2e0 fs/namespace.c:1373
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1380
 task_work_run+0x13a/0x1a0 kernel/task_work.c:222
 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:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 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: 0 PID: 7511 Comm: syz-executor Not tainted 6.10.0-syzkaller-05505-gb1bc554e009e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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