See this comment for a solution to the problem.

There is no crash log or debugging information associated with this problem, aside from the following hardware information:
forced-crash.txt

Following a bisect, the following commit was revealed to be causing the problem: bb33a03

My guess is that our fencing logic in MixinMinecraftClient is causing the hang, as it would be the only thing here running early enough that could cause such a problem. It seems that this is dependent on hardware, as we've only seen older Intel cards hang in this manner.