[jdk17] RFR: 8269830: SA's vm object vtable matching code sometimes matches on incorrect type

[Kevin Walls]

On Fri, 2 Jul 2021 21:57:23 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> See the CR for details. This issue is causing a lot of failures related to some threads occasionally not being included in the jstack output, such as SteadyStateThread, Common-Cleaner, and "Signal Dispatcher". The bug caused SA to sometimes think a JavaThread object is actually an instance of the CompilerThread subclass, even though it is not. This results in jstack not including the thread in the output since it purposefully omits CompilerThreads.

Much simpler!

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Marked as reviewed by kevinw (Committer).

PR: https://git.openjdk.java.net/jdk17/pull/206