[jdk17u-dev] RFR: 8361117: SIGSEGV in LShiftLNode::Ideal due to unexpected dead node [v2]

[Roland Westrelin]

On Mon, 8 Dec 2025 14:46:43 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> This is a new fix for [JDK-8361117](https://bugs.openjdk.org/browse/JDK-8361117) for OpenJDK. I can't see the corresponding fix because it's not public.
>> 
>> This fix is taken from https://github.com/openjdk/jdk/commit/05a0a710313917fe7124ff43fe9c9af1d649bcac.
>> The problem is described in https://github.com/openjdk/jdk/blob/674cc3eeca77f1f2a6d937b1df5c5cd8a13c2d31/test/hotspot/jtreg/compiler/arraycopy/TestACSameSrcDst.java#L87 but that regression test didn't reproduce the issue in jdk17u.
>> 
>> I've taken the reproducer from the issue and put it into a new regression test. The VM crashes without the fix and the test passes with the fix.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Rename new test.

Thanks for making the change. Looks good to me.

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Marked as reviewed by roland (Reviewer).

PR Review: https://git.openjdk.org/jdk17u-dev/pull/4204#pullrequestreview-3552440326