The image has one free space cache inode with invalid mode (0).
        item 9 key (256 INODE_ITEM 0) itemoff 13702 itemsize 160
                generation 30 transid 30 size 65536 nbytes 1507328
                block group 0 mode 0 links 1 uid 0 gid 0 rdev 0
                sequence 23 flags 0x1b(NODATASUM|NODATACOW|NOCOMPRESS|PREALLOC)
                atime 0.0 (1970-01-01 08:00:00)
                ctime 1553491158.189771625 (2019-03-25 13:19:18)
                mtime 0.0 (1970-01-01 08:00:00)
                otime 0.0 (1970-01-01 08:00:00)

Both lowmem and original mode should be able to detect and fix it.

The extracted test image is pretty big (1G extracted), as kernel won't
cache small chunks.
Even with SSD, such test may still take some seconds just extracting the
image.

Signed-off-by: Qu Wenruo <wqu@suse.com>