So you've got a bunch of core files from a failing application. You look in one of them and find what's causing that particular error. However you're not sure whether all the cores are caused by the one same issue.
The application I was having trouble with was a multithreaded app, so I couldn't rely on the stacs being identical every time... so this is what I did.stackdumper.gdb Then in bash:
In my case I found that string in all 80 cores, so I know that was the only issue.