================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / ext4_writepages write to 0xffff88810667d380 of 8 bytes by task 9143 on cpu 0: __add_to_page_cache_locked+0x256/0x4e0 mm/filemap.c:914 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:967 page_cache_ra_unbounded+0x262/0x410 mm/readahead.c:221 ondemand_readahead+0x579/0x7b0 mm/readahead.c:267 page_cache_async_ra+0x165/0x190 mm/readahead.c:607 page_cache_async_readahead include/linux/pagemap.h:902 [inline] filemap_readahead mm/filemap.c:2442 [inline] filemap_get_pages mm/filemap.c:2483 [inline] filemap_read+0x49d/0x1230 mm/filemap.c:2550 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:2108 [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+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810667d380 of 8 bytes by task 9128 on cpu 1: ext4_writepages+0x111/0x1d10 fs/ext4/inode.c:2668 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range mm/filemap.c:413 [inline] filemap_write_and_wait_range+0x20a/0x390 mm/filemap.c:686 __iomap_dio_rw+0x500/0xad0 fs/iomap/direct-io.c:533 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xa4f/0x11d0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2114 [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+0x773/0xda0 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+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9128 Comm: syz-executor.0 Not tainted 5.13.0-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-testdir038507893/syzkaller.3VQ0HC/1744/bus PID: 9128 Comm: syz-executor.0