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List:       openjdk-serviceability-dev
Subject:    Re: RFR: 8274196: Crashes in VM_HeapDumper::work after JDK-8252842 [v5]
From:       Lin Zang <lzang () openjdk ! java ! net>
Date:       2021-09-30 14:45:37
Message-ID: yW5ePxZxOulYdz465RBEBdKjHF3pdAkBEF4yo5KnHAA=.e99cf6e9-6a85-4394-b7bf-761e53d50454 () github ! com
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On Mon, 27 Sep 2021 14:28:43 GMT, Lin Zang <lzang@openjdk.org> wrote:

> > The root cause for crash in ZGC is that the JNIHandles are processed before \
> > object iteration. And ZGC would update the JNIHandles at object iteration with \
> > read barrier. So the crash is cause by accessing the invalid address which can be \
> > dummy info after zgc, and hence crash. 
> > The lock rank issue can be fixed because the related mutexes are acquired in \
> > safepoint. so the safepoint_check_required could be safepoint_check_always. 
> > The Epsilon issue is caused by wrong _num_dumper_thread calculated when the \
> > gang==NULL.
> 
> Lin Zang has updated the pull request incrementally with one additional commit \
> since the last revision: 
> remove load barrier for JNI local roots

Thanks all for your help reviewing this patch. I will integrate it.

-------------

PR: https://git.openjdk.java.net/jdk/pull/5681


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