RFR: 8370502: C2: segfault while adding node to IGVN worklist [v9]

[Dean Long]

On Thu, 22 Jan 2026 11:46:31 GMT, Kerem Kat <krk at openjdk.org> wrote:

>> Do not try to replace `fallthrough_memproj` when it is null, fixes crash.
>> 
>> Test case is simplified from the ticket. Verified that the case crashes without the fix.
>
> Kerem Kat 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 14 additional commits since the last revision:
> 
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - address comments
>  - fix rename
>  - rename test file
>  - Merge branch 'master' into fix-c2-segfault-unlocknode
>  - fix test spacing
>  - ... and 4 more: https://git.openjdk.org/jdk/compare/129feafa...d29208cf

Looks good.

-------------

Marked as reviewed by dlong (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28432#pullrequestreview-3719688418