SIGSEGV crash in ObjectMonitor::enter with latest Shenandoah JDK8

[Alexander Yakushev]

This happened two times today as I increased the load on the process.
Here's a piece of the error file:
https://gist.github.com/alexander-yakushev/828617521ab0368d7bff854745f1fec8.
I can't share all of it, unfortunately, but I will try to make a
lightweight reproducible case

Hope this helps, I will try to provide more context if necessary.