RFR: 8276208: vmTestbase/nsk/jdb/repeat/repeat001/repeat001.java fails with "AssertionError: Unexpected output"

[Chris Plummer]

On Mon, 1 Nov 2021 04:39:27 GMT, Jakob Cornell <duke at openjdk.java.net> wrote:

> This will fix a few issues with the tests added in #5290:
> 
> - [ ] intermittent failures
> - [x] tests should use `failure` method to report problems rather than throwing `AssertionError`

Dan did reproduce the "Unexpected Output" failure on linux. I'm trying to reproduce now, including linux, windows, and macosx. I want to first get a better idea of how frequently it reproduces. Keep in mind that there were extra VM flags applied on all the runs that failed. Try running with the following:

`-Xcomp -XX:+CreateCoredumpOnCrash -ea -esa -XX:CompileThreshold=100 -XX:+UnlockExperimentalVMOptions -server -XX:+TieredCompilation -XX:-DoEscapeAnalysis`

Most of these are probably unnecessary or aren't even impacting how VM is run (ie -Xcomp probably makes -XX:CompileThreshold=100 not do anything). If anything, -Xcomp might be making a difference.

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PR: https://git.openjdk.java.net/jdk/pull/6182