The Java runtime itself crashed
What it looks like in your log
# A fatal error has been detected by the Java Runtime Environment:
What causes it
The JVM died with a native crash rather than a Java error. Usual causes: a mod bundling broken native libraries, a faulty Java build, or bad hardware.
How to fix it
Read the hs_err_pid log for the "Problematic frame". Update Java to the latest patch of the required major version, and remove any mod shipping native libraries. If crashes strike at random, test the machine’s RAM.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log