RFR: 8244679: JVM/TI GetCurrentContendedMonitor/contmon001 failed due to "(IsSameObject#3) unexpected monitor object: 0x000000562336DBA8"

Wed Nov 11 22:26:54 UTC 2020

On Wed, 11 Nov 2020 20:33:15 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> As the stack trace in the bug shows, we cannot load classes, since we may take a monitor.
> Resulting in an unexpected result to GetCurrentContendedMonitor().
> Trying to use some decent primitive, e.g. Wicket/Semaphore/.., without being implementation dependent means we must warm up every possible scenario, since it may use a new class.
> Instead I here just use sleep + volatile for the barriers.
> 
> I cannot reproduce with these changes.
> 
> Chewing through T6 as most issues have been seen there.

LGTM. Thanks for finding the issue!

Patricio

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Marked as reviewed by pchilanomate (Committer).

PR: https://git.openjdk.java.net/jdk/pull/1177