it means that your program died with signal 11 (SIGSEGV on Linux and most other UNIXes), also known as segmentation fault.
In your case your extension has raised this and brought down the VM hard, so this is the only thing the console can report.
Check your code for null/invalid pointer access etc.
You can use cerr to log trace messages into the console from your extension e.g.
std::cerr << "Im here " << std::endl;