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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea00046cb458 of 8 bytes by task 4092 on cpu 0:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1ae/0x2c0 mm/filemap.c:224
 folio_unmap_invalidate+0x1d5/0x350 mm/truncate.c:618
 invalidate_inode_pages2_range+0x293/0x400 mm/truncate.c:693
 filemap_invalidate_pages+0x16f/0x1a0 mm/filemap.c:2817
 kiocb_invalidate_pages+0x6c/0x80 mm/filemap.c:2825
 __iomap_dio_rw+0x5d4/0x12a0 fs/iomap/direct-io.c:703
 iomap_dio_rw+0x40/0x90 fs/iomap/direct-io.c:823
 ext4_dio_write_iter fs/ext4/file.c:575 [inline]
 ext4_file_write_iter+0xba9/0xf80 fs/ext4/file.c:716
 iter_file_splice_write+0x5f2/0x980 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x160/0x2c0 fs/splice.c:1158
 splice_direct_to_actor+0x305/0x680 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xd9/0x150 fs/splice.c:1227
 do_sendfile+0x40a/0x690 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415
 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea00046cb458 of 8 bytes by task 4095 on cpu 1:
 folio_mapping+0xa0/0x120 mm/util.c:701
 folio_evictable mm/internal.h:480 [inline]
 lru_add+0x89/0x440 mm/swap.c:136
 folio_batch_move_lru+0x161/0x230 mm/swap.c:168
 lru_add_drain_cpu+0x7e/0x260 mm/swap.c:642
 lru_add_drain mm/swap.c:730 [inline]
 __folio_batch_release+0x51/0xc0 mm/swap.c:1049
 folio_batch_release include/linux/pagevec.h:101 [inline]
 filemap_splice_read+0x7fa/0x930 mm/filemap.c:3032
 ext4_file_splice_read+0x8f/0xb0 fs/ext4/file.c:158
 do_splice_read fs/splice.c:979 [inline]
 splice_direct_to_actor+0x26c/0x680 fs/splice.c:1083
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xd9/0x150 fs/splice.c:1227
 do_sendfile+0x40a/0x690 fs/read_write.c:1368
 __do_sys_sendfile64 fs/read_write.c:1429 [inline]
 __se_sys_sendfile64 fs/read_write.c:1415 [inline]
 __x64_sys_sendfile64+0x113/0x160 fs/read_write.c:1415
 x64_sys_call+0xfc3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88811810cfe8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4095 Comm: syz.1.213 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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