For sure! I had a bug that crashed our system once every 14 days or so and every coredump had a different stack trace. The "star programmer" managed to shift the bug onto me, the newbie graduate, after failing. This was a long time ago and I had to sort of invent fuzz-testing (as far as I knew!) to reproduce the problem in a short enough time that it could be debugged. That bug took weeks to find and there was nobody to help and only a manager kicking my arse every day. Instead of a medal I got brickbats for solving it but they did carry on using my testing system...