[toast0]

I don't know if it's always been the case, but it is certainly possible to attach and detach a debugger from an existing process, gdb/lldb takes -p for pid. (Although, detaching from threaded processes seems to have a risk of the process ending up stuck in my experience)

Briefly popping into the debugger can be a really quick way to find where an infinite loop is happening, especially if it's not in your code, or not where you expect. I found this especially helpful in diagnosing a FreeBSD kernel loop I ran into, once the location of the loop was clear, the fix was simple.

[Gibbon1]

As you can see we have identified the crash in this process. Good have Steiner attach GBD to it to find out what is wrong. Mein Fuhrer... Steiner... Steiner accidentally killed the process and rebooted the server.