================================================================== BUG: KCSAN: data-race in ext4_dio_write_end_io / ondemand_readahead write to 0xffff8881069803d0 of 8 bytes by task 5974 on cpu 1: i_size_write include/linux/fs.h:871 [inline] ext4_dio_write_end_io+0xd3/0x100 fs/ext4/file.c:399 iomap_dio_complete+0xb8/0x3c0 fs/iomap/direct-io.c:88 iomap_dio_rw+0x4e/0x70 fs/iomap/direct-io.c:652 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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881069803d0 of 8 bytes by task 5991 on cpu 0: i_size_read include/linux/fs.h:849 [inline] do_page_cache_ra mm/readahead.c:254 [inline] ondemand_readahead+0x51b/0x7b0 mm/readahead.c:550 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:578 page_cache_sync_readahead include/linux/pagemap.h:884 [inline] filemap_get_pages mm/filemap.c:2467 [inline] filemap_read+0x388/0x1230 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] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x000000000079e000 -> 0x00000000007ad000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5991 Comm: syz-executor.3 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================