Comment 0 for bug 1189926

When using io_perf corruption can be detected when using qemu-kvm-1.0.

This affects the qemu-kvm version in Precise, but is fixed in Quantal and beyond.

It is expected that running the test case results in no disk corruption; however we detect corruption on Precise.

Running git bisect on this test finds that commit 68d100e905453ebbeea8e915f4f18a2bd4339fe8 introduced the problem between v0.15.0 and v1.0.
Running git bisect in reverse finds that commit b7ab0fea37c15ca9e249c42c46f5c48fd1a0943c fixes the issue between v1.1.2 and v1.2.0.

However, b7ab0fea cannot be easily backported to v1.0 and 68d100e9 is a large change to revert. However, both changes seem to indicate that the problem lies in the qcow2 parts of the code.

bug 1040033 seems to be a related issue.