Identified a logic flaw in glibc related to how resolv.conf search domains are concatenated.

This flaw causes the resolver to generate redundant/duplicate DNS queries, resulting in unnecessary network traffic and increased latency in high-volume environments.

Upstream Status:

• Bug ID: https://www.sourceware.org/bugzilla/show_bug.cgi?id=33804

• Proposed Patch: https://patchwork.sourceware.org/project/glibc/patch/20251218113556.159662-1-carlospeon@gmail.com/

• Reproducer: See thread by Petr Mensik in the upstream bug report.

Current State & Blocker: Submitted a trivial patch to upstream (Sourceware). However, the merge is currently blocked because upstream maintainers require a formal regression test within the glibc test suite. Submitter lacks the deep expertise in the glibc testing framework to implement this specific test.

Request to Engineering: We are requesting the glibc team to:

1. Validate the customer's proposed fix.

1. Adopt the contribution: Create the required regression test to satisfy upstream requirements.

1. Backport: Once merged upstream, backport the fix to the relevant RHEL versions.

Business Justification: The hard work (root cause analysis and patching) has already been done. This is a "quick win" to improve RHEL DNS performance. Submitter is actively waiting for Red Hat Engineering to facilitate the inclusion of this fix.