How to get the log file is described on the wiki link I posted.
But the debug window shows similar info. I don't think the log will give much more info.
If the error did happen on the run, which you copy and pasted, then gdb did respond (contrary to the IDE error message).
There is a tiny chance that 1.2.4 will be better.
But before upgrading try the items below
Basically: There is no definitive fix for this:
* The other link I posted (gdb stopped working). Using "auto-solib off" can fix a lot of problems.
* Also try to either use Norton in game mode, or add an exception for gdb AND your app.
* You may try another gdb / but I do not expect it to make a difference.
http://sourceforge.net/projects/mingw/files/MinGW/Extension/gdb/Some of them have other issues. There are some tips on the linked wiki page
* upgrade Lazarus