Alright, so this is pretty easy to replicate. Running SMW, I've been trying to learn some of the glitches, namely the ones highlighted by the recent Sethbling run, but any ol' glitch will do. It involved me trying a glitch or setting one up, screwing it up, and rewinding and trying again as opposed to using savestates.
The crashes seem like they're less random and more like they happen after a certain amount of total time the rewind was used. I have yet to attempt this on another game, however.
Included are three images in the order of what happens after BizHawk crashes.
Oddly enough, I was lucky to get the last screen on the first try after I decided to submit it as a bug, given Zeromus' opinion of the matter in another thread. Before I had only seen that error once out of the maybe 15 times it happened previously.
-Edit-
I suppose I should add I'm using Win 8.1 on a system with an Athlon FX 8320 and 8gb of system ram.
It also usually happens within 3-5 minutes, but anywhere in between which makes me believe that it's after a certain amount of rewind usage has passed. I had accidentally left the emulator running unpaused, however the game itself was paused, and it took maybe a minute afterwards for the crash to appear. The emulator had to have been running for at least two hours prior with the game paused (not the emulator) in the background. Also, all the rewind settings are at
default.