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BUG: KCSAN: data-race in __lru_add_drain_all / folio_add_lru

read-write to 0xffff888237d2ac68 of 1 bytes by task 4741 on cpu 1:
 folio_batch_add include/linux/pagevec.h:77 [inline]
 __folio_batch_add_and_move mm/swap.c:239 [inline]
 folio_add_lru+0xa3/0x1f0 mm/swap.c:527
 shmem_alloc_and_add_folio mm/shmem.c:1869 [inline]
 shmem_get_folio_gfp+0x7d6/0xd90 mm/shmem.c:2332
 shmem_fault+0xfa/0x250 mm/shmem.c:2533
 __do_fault+0xb6/0x200 mm/memory.c:4882
 do_read_fault mm/memory.c:5297 [inline]
 do_fault mm/memory.c:5431 [inline]
 do_pte_missing mm/memory.c:3965 [inline]
 handle_pte_fault mm/memory.c:5766 [inline]
 __handle_mm_fault mm/memory.c:5909 [inline]
 handle_mm_fault+0xe7f/0x2a80 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:3371 [inline]
 vm_mmap_pgoff+0x1d6/0x290 mm/util.c:593
 ksys_mmap_pgoff+0xd0/0x330 mm/mmap.c:542
 x64_sys_call+0x1884/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:10
 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 0xffff888237d2ac68 of 1 bytes by task 3324 on cpu 0:
 folio_batch_count include/linux/pagevec.h:56 [inline]
 cpu_needs_drain mm/swap.c:786 [inline]
 __lru_add_drain_all+0x136/0x3f0 mm/swap.c:880
 lru_add_drain_all+0x10/0x20 mm/swap.c:896
 invalidate_bdev+0x47/0x70 block/bdev.c:101
 ext4_put_super+0x571/0x840 fs/ext4/super.c:1349
 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:7320
 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:239
 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: 0x12 -> 0x14

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3324 Comm: syz-executor Not tainted 6.12.0-rc5-syzkaller-00330-ga33ab3f94f51 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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