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

[Roland Westrelin]

On Mon, 29 Mar 2021 06:55:06 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Roland Westrelin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   test with -XX:+IgnoreUnrecognizedVMOptions
>
> 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?

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