I had contributed some improvements for the error reporting step "printing register info" with JDK-8207342.
But there are still parts which crash too easily. Oop and klass checks should get improved.
I have seen
"[error occurred during error reporting (printing register info), id 0xe0000000, Internal Error (/openjdk/jdk/src/hotspot/share/oops/klass.inline.hpp:63)]"
when using -XX:+CrashGCForDumpingJavaThread with recent jdk12.

"[error occurred during error reporting (printing register info)" can also be found in many hs_err files in the internet. This change is supposed to help people to investigate the root cause of crashes by providing the register info much more reliably.