Thanks for the report. I'm going to check the memcpy's, see if there's one that overlaps. Wow, it could even be the first time OpenBSD's quirkiness is actually *useful* to the developer.
Found and fixed. Please try with the latest execline git and tell me if it solved your problem. It pains me to say this, but I really have to thank OpenBSD for that excellent feature. It would be something cool to port to other libcs. -- Laurent