[Full-disclosure] # a new bug in Olly

[Peter Ferrie]

> I've found a bug in Olly leading to crash SEH/VEH-based programs
> during tracing. (an example-pack could be found at my web-site
> http://nezumi.org.ru/olly-bug-776.zip, it includes two SEH/VEH
> programs and requests XP or latter to run VEH, while SEH works
> everywhere).

This was posted to OpenRCE already by a different person, and as I
wrote there, it's not so much a bug in Olly as a side-effect which
produces a known Windows behaviour.
Causing an exception while the T flag is set will trigger a secondary
exception inside the KiUserExceptionDispatcher, resulting in the
single_step exception being delivered first (except in VirtualPC, at
least).