[kaahos]

What does this PR do?:
Use matched Clang 17, compiler-rt and llvm-cov defaults for local glibc images on x64 and ARM64. Version both cache levels with -clang17-cov1; preserve musl and dependent-JDK rebuild behavior.

Motivation:
Avoid Clang 14.0.0’s ARM64 sanitizer miscompilation of valid masked array indices. Keep coverage tools compatible with the default compiler.

Additional Notes:

• Passed: agentic review, no findings.
• Blocked: rebuilt local-image qualification, including installed toolchain identities, native/Java tests and coverage reporting. CI uses separate images.

How to test the change?:

bash utils/tests/test_run_containers_tests.sh
# Inside a provisioned Linux glibc image:
bash utils/tests/manual/test_masked_index_compiler.sh clang++

• Passed locally: four focused configurations; supplemental 205 runner checks/27 cases and seven negative controls; formatting, syntax, source and documentation checks.
• Failed in CI: test-matrix / test-linux-glibc-amd64 (11, debug, regular).

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a security review (run the dd:platform-security-review
  skill, or file a request via the PSEC review form).
  bewaire also runs automatically on every PR.
• This PR doesn't touch any of that.
• JIRA: PROF-16425

[dd-octo-sts]

✅ All 40 integration tests passed

📊 Dashboard · 👷 Pipeline · 📦 36576574

[dd-octo-sts]

Reliability & Chaos Results

✅ All reliability & chaos checks passed Pipeline: https://gitlab.ddbuild.io/DataDog/java-profiler/-/pipelines/149885040

[dd-octo-sts]

Scan-Build Report

User:	runner@runnervmwuk1x
Working Directory:	/home/runner/work/java-profiler/java-profiler/ddprof-lib/src/test/make
Command Line:	make -j4 all
Clang Version:	Ubuntu clang version 21.1.8 (6ubuntu1)
Date:	Mon Nov 9 23:24:17 2026

Bug Summary

Bug Type	Quantity	Display?
All Bugs	2
Logic error
Dereference of null pointer	1
Unused code
Dead initialization	1

Filter Results by File

Reports

Bug Group	Bug Type ▾	File	Function/Method	Line	Path Length
Unused code	Dead initialization	referenceChains.cpp	applyOomRamp	497	1
Logic error	Dereference of null pointer	perfEvents_linux.cpp	unregisterThread	720	26

[dd-octo-sts]

CI Test Results

Run: #42719976827 | Commit: bf0ac4f | Duration: 19m 57s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

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Updated: 2026-11-09 23:45:05 UTC