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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004171f98 of 8 bytes by task 12648 on cpu 1:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:224
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:253
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x244/0xa80 mm/shmem.c:1121
 shmem_truncate_range mm/shmem.c:1237 [inline]
 shmem_evict_inode+0x134/0x520 mm/shmem.c:1365
 evict+0x2e0/0x550 fs/inode.c:810
 iput_final fs/inode.c:1898 [inline]
 iput+0x447/0x5b0 fs/inode.c:1924
 do_unlinkat+0x2c4/0x4c0 fs/namei.c:4650
 __do_sys_unlink fs/namei.c:4689 [inline]
 __se_sys_unlink fs/namei.c:4687 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4687
 x64_sys_call+0x22a6/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004171f98 of 8 bytes by task 15759 on cpu 0:
 folio_mapping+0xa1/0x120 mm/util.c:701
 folio_evictable mm/internal.h:480 [inline]
 lru_add+0x80/0x430 mm/swap.c:136
 folio_batch_move_lru+0x174/0x230 mm/swap.c:168
 __folio_batch_add_and_move mm/swap.c:196 [inline]
 folio_add_lru+0x14a/0x1f0 mm/swap.c:505
 folio_add_lru_vma+0x49/0x70 mm/swap.c:524
 wp_page_copy mm/memory.c:3546 [inline]
 do_wp_page+0x12f6/0x23e0 mm/memory.c:3939
 handle_pte_fault mm/memory.c:6013 [inline]
 __handle_mm_fault mm/memory.c:6140 [inline]
 handle_mm_fault+0x6dc/0x2ae0 mm/memory.c:6309
 do_user_addr_fault+0x636/0x1090 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x54/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0xffff8881062ab928 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15759 Comm: syz-executor Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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