RFR: 8253916: ResourceExhausted/resexhausted001 crashes on Linux-x64 [v2]

Coleen Phillimore coleenp at openjdk.java.net
Tue Dec 1 22:04:00 UTC 2020


On Tue, 1 Dec 2020 20:12:28 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>> Coleen Phillimore has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
>> 
>>  - Merge branch 'master' into mprotect
>>  - Made resexhaused001.004 manual tests.  You can't reliably run these tests.
>>  - 8253916: ResourceExhausted/resexhausted001 crashes on Linux-x64
>
> src/hotspot/share/runtime/stackOverflow.cpp line 109:
> 
>> 107:   }
>> 108: 
>> 109:   log_debug(os, thread)("Thread " UINTX_FORMAT " stack guard pages activated: "
> 
> I always was curious about this uncommit. I wondered whether it was a fallback for platforms where mprotect would not work on thread stacks. But then, why warn unconditionally?

Maybe the uncommit was an attempt to achieve the same thing as protecting the pages, ie get a SEGV when accessing them. I don't know either.

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PR: https://git.openjdk.java.net/jdk/pull/1540


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