RFR: 8263971: C2 crashes with SIGFPE with -XX:+StressGCM and -XX:+StressIGVN [v3]

[Tobias Hartmann]

On Mon, 29 Mar 2021 14:54:13 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> test/hotspot/jtreg/compiler/loopopts/TestLostDependencyOnZeroTripGuard.java line 30:
>> 
>>> 28:  *
>>> 29:  * @run main/othervm -Xcomp -XX:-TieredCompilation -XX:CompileOnly=TestLostDependencyOnZeroTripGuard -XX:+UnlockDiagnosticVMOptions
>>> 30:  *                   -XX:+IgnoreUnrecognizedVMOptions -XX:+StressGCM -XX:StressSeed=886771365 TestLostDependencyOnZeroTripGuard
>> 
>> Is it worth adding another @run with no fixed seed? Just to give this a chance to still trigger the bug if the implementation changes in the future such that the fixed seed does not work anymore.
>
> Thanks for the review. Would you drop -XX:+StressGCM as well or keep it?

I would keep it.

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PR: https://git.openjdk.java.net/jdk/pull/3190