syzbot

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BUG: KCSAN: data-race in __filemap_remove_folio / filemap_write_and_wait_range

read-write to 0xffff8881066a6c08 of 8 bytes by task 7021 on cpu 1:
 page_cache_delete mm/filemap.c:154 [inline]
 __filemap_remove_folio+0x1c5/0x2c0 mm/filemap.c:232
 __remove_mapping+0x341/0x470 mm/vmscan.c:762
 remove_mapping+0x22/0x90 mm/vmscan.c:795
 mapping_evict_folio mm/truncate.c:293 [inline]
 mapping_try_invalidate+0x288/0x3e0 mm/truncate.c:511
 invalidate_mapping_pages+0x27/0x40 mm/truncate.c:549
 ext4_dio_write_iter fs/ext4/file.c:619 [inline]
 ext4_file_write_iter+0xdca/0xe30 fs/ext4/file.c:696
 iter_file_splice_write+0x5e6/0x970 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x16c/0x2c0 fs/splice.c:1164
 splice_direct_to_actor+0x305/0x670 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3ab/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
 x64_sys_call+0x2c9f/0x2d70 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

read to 0xffff8881066a6c08 of 8 bytes by task 7018 on cpu 0:
 mapping_needs_writeback mm/filemap.c:635 [inline]
 filemap_write_and_wait_range+0x58/0x1f0 mm/filemap.c:684
 kiocb_write_and_wait+0x79/0x110 mm/filemap.c:2711
 __iomap_dio_rw+0x4d9/0x1090 fs/iomap/direct-io.c:593
 iomap_dio_rw+0x40/0x90 fs/iomap/direct-io.c:749
 ext4_dio_read_iter fs/ext4/file.c:94 [inline]
 ext4_file_read_iter+0x220/0x2a0 fs/ext4/file.c:145
 copy_splice_read+0x3a4/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:984 [inline]
 splice_direct_to_actor+0x28e/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+0x3ab/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
 x64_sys_call+0x2c9f/0x2d70 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: 0x0000000000000008 -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7018 Comm: syz-executor.2 Not tainted 6.10.0-rc2-syzkaller-00366-g771ed66105de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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