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BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping

write to 0xffffea00047ab568 of 8 bytes by task 21070 on cpu 0:
 __delete_from_swap_cache+0x1f0/0x290 mm/swap_state.c:163
 delete_from_swap_cache+0x72/0xe0 mm/swap_state.c:243
 shmem_swapin_folio+0xd80/0xe80 mm/shmem.c:2410
 shmem_get_folio_gfp+0x26e/0xd90 mm/shmem.c:2478
 shmem_fault+0xfa/0x250 mm/shmem.c:2746
 __do_fault+0xb6/0x200 mm/memory.c:4990
 do_read_fault mm/memory.c:5410 [inline]
 do_fault mm/memory.c:5544 [inline]
 do_pte_missing mm/memory.c:4060 [inline]
 handle_pte_fault mm/memory.c:5907 [inline]
 __handle_mm_fault mm/memory.c:6050 [inline]
 handle_mm_fault+0xe98/0x2ac0 mm/memory.c:6219
 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]
 vm_mmap_pgoff+0x224/0x2d0 mm/util.c:580
 ksys_mmap_pgoff+0x286/0x330 mm/mmap.c:607
 x64_sys_call+0x1940/0x2dc0 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 0xffffea00047ab568 of 8 bytes by task 21065 on cpu 1:
 folio_mapping+0xdb/0x120 mm/util.c:857
 folio_evictable mm/internal.h:437 [inline]
 lru_add+0x89/0x440 mm/swap.c:136
 folio_batch_move_lru+0x15f/0x230 mm/swap.c:168
 lru_add_drain_cpu+0x7c/0x260 mm/swap.c:642
 lru_add_drain+0x26/0x80 mm/swap.c:730
 swap_cluster_readahead+0x365/0x3f0 mm/swap_state.c:699
 shmem_swapin_cluster mm/shmem.c:1705 [inline]
 shmem_swapin_folio+0x73f/0xe80 mm/shmem.c:2336
 shmem_get_folio_gfp+0x26e/0xd90 mm/shmem.c:2478
 shmem_get_folio mm/shmem.c:2651 [inline]
 shmem_file_splice_read+0x18a/0x5d0 mm/shmem.c:3554
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x269/0x670 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x398/0x660 fs/read_write.c:1363
 __do_sys_sendfile64 fs/read_write.c:1424 [inline]
 __se_sys_sendfile64 fs/read_write.c:1410 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1410
 x64_sys_call+0xfbd/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:41
 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: 0x00000000000002a1 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 21065 Comm: syz.1.6256 Not tainted 6.14.0-rc6-syzkaller-00003-g4d872d51bc9d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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