(In reply to Kurt Garloff from comment #15) > Thanks for your investigation! > Can you elaborate on "-fno-strict-aliasing not permanently fixing the issue"? I added -fno-strict-aliasing some time ago without any code modifications https://build.opensuse.org/package/rdiff/openSUSE:Factory/dd_rescue?linkrev=base&rev=47 this worked for a few weeks, but then it started to fail again. > Did you still observe issues with the aliasing fix patch applied? Not at the moment.