QA output created by 024
Creating backing file

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
=== IO: pattern 0x11
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 131072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 393216
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 524288
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 655360
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 786432
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 917504
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Creating new backing file

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 
=== IO: pattern 0x22
wrote 131072/131072 bytes at offset 0
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 131072/131072 bytes at offset 262144
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 131072/131072 bytes at offset 524288
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 131072/131072 bytes at offset 786432
128 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Creating COW image

Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824 backing_file='TEST_DIR/t.IMGFMT.base_old' 
=== IO: pattern 0x33
wrote 262144/262144 bytes at offset 0
256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
wrote 262144/262144 bytes at offset 524288
256 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Read before the rebase to make sure everything is set up correctly

=== IO: pattern 0x33
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 65536
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 131072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 196608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 327680
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 393216
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 458752
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 524288
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 589824
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 655360
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 720896
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 786432
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 851968
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 917504
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 983040
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

Rebase and test again

=== IO: pattern 0x33
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 65536
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 131072
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 196608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 262144
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 327680
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 393216
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 458752
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 524288
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 589824
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 655360
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x33
read 65536/65536 bytes at offset 720896
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 786432
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 851968
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x11
read 65536/65536 bytes at offset 917504
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== IO: pattern 0x00
read 65536/65536 bytes at offset 983040
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
*** done