[jdk26u] RFR: 8370502: C2: segfault while adding node to IGVN worklist

[duke]

On Wed, 25 Feb 2026 11:44:54 GMT, Ozan Çetin <duke at openjdk.org> wrote:

> Backporting JDK-8370502: C2: segfault while adding node to IGVN worklist.
> 
> This PR backports a fix for a C2 segmentation fault that occurs when expanding an UnlockNode with a null memory projection. The fix adds a necessary null check to ensure fallthrough_memproj is valid before attempting to replace it in the IGVN worklist.
> 
> make run-test TEST=tier1
> make run-test TEST=hotspot_compiler
> make run-test TEST=test/hotspot/jtreg/compiler/c2/TestUnlockNodeNullMemprof.java

@0zzy0sbourne 
Your change (at version 76e1b91aae3143239dca533a44788ac82455f963) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk26u/pull/75#issuecomment-3966136501