RFR: 8244291: Test: gc/z/TestGarbageCollectorMXBean.java failed: "unexpected cycles"

Erik Österlund erik.osterlund at oracle.com
Wed May 20 07:48:44 UTC 2020



On 2020-05-19 22:20, Per Liden wrote:
> The test gc/z/TestGarbageCollectorMXBean.java has failed once on 
> Windows (out of several thousands of runs) in our CI. I've been unable 
> to reproduce the problem, and code inspection has not reviled anything 
> suspicious. The only explanation that seems semi-plausible is that the 
> the Notification thread was severely starved on CPU and didn't manage 
> to send notifications in a timely manner.
> This patch extends the notification timeout from 60 to 90 seconds, and 
> adds additional logging with timestamps, which will hopefully help us 
> understand the problem a bit better if it ever happens again.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8244291
> Webrev: http://cr.openjdk.java.net/~pliden/8244291/webrev.0
> /Per

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