[jdk18] RFR: 8278239: vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine failed with EXCEPTION_ACCESS_VIOLATION at 0x000000000000000d

Wed Dec 22 17:09:15 UTC 2021

On Tue, 21 Dec 2021 20:51:04 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is the fix for https://github.com/openjdk/jdk/pull/6900 retargeted to JDK 18.
> 
> Thanks to @stefank and @fisk for the diagnosis. ZGC is looking at metadata in unloaded nmethods, but redefinition doesn't keep this metadata from being deallocated. Change the iterators that mark metadata in use to walk unloaded nmethods as well as other alive nmethods.
> 
> The test case reproduces the crash on windows if run in an 100 iteration loop. This fix does not crash in the same test. Also ran tier1-6.
> 
> Above testing in progress.

Thanks for reviewing, Vladimir and Serguei.

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PR: https://git.openjdk.java.net/jdk18/pull/63