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BUG: KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range

read-write to 0xffff888106a8e2e8 of 8 bytes by task 26637 on cpu 0:
 __filemap_add_folio+0x4c1/0x730 mm/filemap.c:903
 filemap_add_folio+0x70/0x160 mm/filemap.c:938
 page_cache_ra_unbounded+0x15e/0x2e0 mm/readahead.c:250
 do_page_cache_ra mm/readahead.c:299 [inline]
 page_cache_ra_order mm/readahead.c:544 [inline]
 ondemand_readahead+0x50b/0x670 mm/readahead.c:666
 page_cache_async_ra+0x94/0xa0 mm/readahead.c:715
 do_async_mmap_readahead mm/filemap.c:3181 [inline]
 filemap_fault+0x3da/0xc30 mm/filemap.c:3235
 __do_fault+0xb2/0x1f0 mm/memory.c:4376
 do_read_fault mm/memory.c:4738 [inline]
 do_fault mm/memory.c:4868 [inline]
 do_pte_missing mm/memory.c:3745 [inline]
 handle_pte_fault mm/memory.c:5144 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0xd5f/0x27c0 mm/memory.c:5450
 faultin_page mm/gup.c:958 [inline]
 __get_user_pages+0x402/0xe40 mm/gup.c:1241
 populate_vma_page_range mm/gup.c:1679 [inline]
 __mm_populate+0x216/0x330 mm/gup.c:1788
 mm_populate include/linux/mm.h:3391 [inline]
 vm_mmap_pgoff+0x1a7/0x240 mm/util.c:561
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1425
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888106a8e2e8 of 8 bytes by task 26632 on cpu 1:
 mapping_needs_writeback mm/filemap.c:626 [inline]
 filemap_write_and_wait_range+0x51/0x210 mm/filemap.c:675
 kiocb_write_and_wait+0x79/0x110 mm/filemap.c:2689
 __iomap_dio_rw+0x4fe/0x1090 fs/iomap/direct-io.c:592
 iomap_dio_rw+0x40/0x90 fs/iomap/direct-io.c:748
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x21c/0x2a0 fs/ext4/file.c:145
 call_read_iter include/linux/fs.h:2079 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x288/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000000000014f -> 0x0000000000000157

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26632 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00014-g7e90b5c295ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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