================================================================== BUG: KCSAN: data-race in ext4_ext_index_trans_blocks / ext4_ext_insert_extent write to 0xffff88810b00e1c6 of 2 bytes by task 30149 on cpu 1: le16_add_cpu include/linux/byteorder/generic.h:146 [inline] ext4_ext_grow_indepth fs/ext4/extents.c:1330 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1380 [inline] ext4_ext_insert_extent+0xc8c/0x2bc0 fs/ext4/extents.c:2054 ext4_ext_map_blocks+0x1597/0x1fd0 fs/ext4/extents.c:4259 ext4_map_blocks+0x726/0xff0 fs/ext4/inode.c:638 mpage_map_one_extent+0x10d/0x3a0 fs/ext4/inode.c:2397 mpage_map_and_submit_extent fs/ext4/inode.c:2450 [inline] ext4_writepages+0xa51/0x1e70 fs/ext4/inode.c:2802 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:424 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:763 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2843 [inline] ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:277 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502 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 read to 0xffff88810b00e1c6 of 2 bytes by task 30147 on cpu 0: ext_depth fs/ext4/ext4_extents.h:193 [inline] ext4_ext_index_trans_blocks+0x86/0xb0 fs/ext4/extents.c:2356 ext4_index_trans_blocks fs/ext4/inode.c:5617 [inline] ext4_meta_trans_blocks fs/ext4/inode.c:5643 [inline] ext4_chunk_trans_blocks fs/ext4/inode.c:5701 [inline] ext4_iomap_alloc fs/ext4/inode.c:3397 [inline] ext4_iomap_begin+0x2c4/0x6a0 fs/ext4/inode.c:3478 iomap_apply+0x8d/0x4a0 fs/iomap/apply.c:46 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641 ext4_dio_write_iter fs/ext4/file.c:551 [inline] ext4_file_write_iter+0xe5d/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: 0 PID: 30147 Comm: syz-executor.5 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================