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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004fd5f18 of 8 bytes by task 21056 on cpu 1:
 page_cache_delete mm/filemap.c:145 [inline]
 __filemap_remove_folio+0x201/0x2e0 mm/filemap.c:227
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:257
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x27f/0xb60 mm/shmem.c:1157
 shmem_truncate_range mm/shmem.c:1289 [inline]
 shmem_evict_inode+0x12d/0x580 mm/shmem.c:1420
 evict+0x2a5/0x510 fs/inode.c:822
 iput_final fs/inode.c:2014 [inline]
 iput+0x430/0x5a0 fs/inode.c:2063
 dentry_unlink_inode+0x24a/0x260 fs/dcache.c:479
 dentry_kill+0x184/0x500 fs/dcache.c:826
 finish_dput+0x16/0x1d0 fs/dcache.c:1001
 dput+0x48/0x50 fs/dcache.c:1042
 __fput+0x43e/0x630 fs/file_table.c:520
 fput_close_sync+0xad/0x190 fs/file_table.c:618
 __do_sys_close fs/open.c:1560 [inline]
 __se_sys_close fs/open.c:1545 [inline]
 __x64_sys_close+0x55/0xf0 fs/open.c:1545
 x64_sys_call+0x812/0x2550 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004fd5f18 of 8 bytes by task 21059 on cpu 0:
 folio_mapping+0xa1/0xe0 mm/util.c:732
 folio_evictable mm/internal.h:650 [inline]
 lru_add+0x80/0x420 mm/folio.c:130
 folio_batch_move_lru+0x2d6/0x3d0 mm/folio.c:194
 __folio_batch_add_and_move mm/folio.c:225 [inline]
 folio_add_lru+0x14a/0x250 mm/folio.c:489
 folio_add_lru_vma+0x49/0x70 mm/folio.c:508
 map_anon_folio_pte_nopf+0x1ca/0x3d0 mm/memory.c:5406
 map_anon_folio_pte_pf+0x6b/0x160 mm/memory.c:5416
 do_anonymous_page mm/memory.c:5519 [inline]
 do_pte_missing mm/memory.c:4698 [inline]
 handle_pte_fault mm/memory.c:6558 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0x3af5/0x3bb0 mm/memory.c:6876
 do_user_addr_fault+0x636/0x1060 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

value changed: 0xffff88811c3cdfd0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 21059 Comm: sed Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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