netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.4'. ================================================================== BUG: KCSAN: data-race in ext4_set_iomap / writeback_single_inode write to 0xffff8881065be418 of 8 bytes by task 8238 on cpu 0: writeback_single_inode+0x143/0x590 fs/fs-writeback.c:1577 sync_inode fs/fs-writeback.c:2624 [inline] sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2644 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x359/0x670 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2982 [inline] ext4_buffered_write_iter+0x39c/0x3f0 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x11d0 fs/ext4/file.c:519 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x69d/0x770 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881065be418 of 8 bytes by task 8249 on cpu 1: ext4_inode_datasync_dirty fs/ext4/inode.c:3330 [inline] ext4_set_iomap+0x17c/0x460 fs/ext4/inode.c:3345 ext4_iomap_begin+0x5ce/0x620 fs/ext4/inode.c:3484 iomap_apply+0x8d/0x400 fs/iomap/apply.c:46 __iomap_dio_rw+0x5af/0xad0 fs/iomap/direct-io.c:561 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128 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_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000007 -> 0x0000000000000080 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8249 Comm: syz-executor.4 Tainted: G W 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================