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Kernel developers don't use and IDE for the Linux kernel, and they are arguably some of the best programmers in the world. Great programmers use vim or emacs, because the imagery in their mind is far more powerful than anything an IDE could display. Besides, any screen real estate used for "interpretive" purposes is just an annoyance.
I've used vim pretty much every work day in the last 15 years or so, and I can count the number of times it's crashed on one hand. If you can actually verify that it crashed (i.e. core dump file), then you've got the source available, and you can send in the patch.
Most likely you've typed Ctrl-S, which causes the terminal to pause. Here is the what the vim docs have to say about that:
Note: CTRL-S does not work on all terminals and might block further input, use CTRL-Q to get going again.
There exists an enormous body body of reliable and fast code written in "C" (e.g. the Linux kernel). I've been coding in C for 27 years, C++ for 20. I think the idea that a language can permit only useful work to occur is naive. In order to code well, the programmer must understand how the computer works, and have a great deal of focus. If you have those, "helpful" languages only seem to get in the way.
Isn't complaining that (INT_MAX + 1) is undefined the same as complaining that (8/0) is undefined? What meaningful functionality could be gained by defining overflow behavior? If you really want to know what INT_MAX + 1 is, try:
printf("INT_MAX+1= %lld\n", (long long)INT_MAX + 1LL);