C2 Jit compiler fails accessing off-heap memory via Unsafe with ShenandoahGC

[Roland Westrelin]

Hi Sergey,

> Are there any chances to get it backported to jdk 17 and 21?

I intend to backport it to 25, 21 and 17.

> Our product (Apache Ignite) heavily relies on off-heap memory operations 
> via Unsafe.  I already applied the work around in our code but still not 
> 100% sure that problem wouldn't hit in some other place.

So the bug could affect end users of Apache Ignite? That's useful to
know and I'll use that to motivate the backports.

Roland.