[8u] RFR: 8196969: JTreg Failure: serviceability/sa/ClhsdbJstack.java causes NPE

[Severin Gehwolf]

Hi,

Could I please get a review of this OpenJDK 8u backport of 8196969
which fixes a potential NPE when attaching to a Java process via jstack
-F <pid> and observing compiled frames with a null debug offset. The
patch is the same as for JDK 11 and JDK 14 (modulo path changes), but
I've dropped the tests since the SA test infra doesn't exist in 8u.

I've verified manually that the fix works.

Bug: https://bugs.openjdk.java.net/browse/JDK-8196969
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8196969/jdk8/01/webrev/
original change: https://hg.openjdk.java.net/jdk/jdk/rev/516db52daad6

Thoughts?

Thanks,
Severin