================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / iomap_dio_complete write to 0xffff88800b3183d8 of 8 bytes by task 28933 on cpu 0: __add_to_page_cache_locked+0x3ad/0x6e0 mm/filemap.c:887 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:940 page_cache_ra_unbounded+0x272/0x4c0 mm/readahead.c:222 ondemand_readahead+0x560/0x780 mm/readahead.c:267 page_cache_async_ra+0x1aa/0x1d0 mm/readahead.c:607 page_cache_async_readahead include/linux/pagemap.h:863 [inline] filemap_readahead mm/filemap.c:2350 [inline] filemap_get_pages+0x2b4/0x660 mm/filemap.c:2391 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1971 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x565/0x5d0 fs/read_write.c:496 ksys_read+0xce/0x180 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:642 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88800b3183d8 of 8 bytes by task 28923 on cpu 1: iomap_dio_complete+0x31a/0x3c0 fs/iomap/direct-io.c:112 iomap_dio_rw+0x4e/0x70 fs/iomap/direct-io.c:644 ext4_dio_write_iter fs/ext4/file.c:551 [inline] ext4_file_write_iter+0xeaa/0x10b0 fs/ext4/file.c:661 call_write_iter include/linux/fs.h:1977 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x40a/0x750 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 28923 Comm: syz-executor.4 Tainted: G W 5.12.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Page cache invalidation failure on direct I/O. Possible data corruption due to collision with buffered I/O! File: /root/syzkaller-testdir344027398/syzkaller.ZmLs4Q/293/bus PID: 28923 Comm: syz-executor.4