Probably auto-saves are performed during regular operations?
Its the second time this happens to me, first time in front of audience a month ago. Thank you Murphys Law.

This time the crash was so heavy that even the Kdevelop Crash Handler afterwards crashed itself as I was going
to look at the Developer Information.

Just before the initial crash I performed a variable name replacement with Search Tool across several c++ project files.

Maybe autosaves should be singular events during kdevelop session lifetime where all other threads are blocked
for the time save operation is running, so autosaves should at earliest be performed when all other threads are done.

maybe this helps.