Affected Environments

The failure is consistently observed on the following Real-Time kernel builds:

• rt79z-kernel-rt-3.10.0-1160.144.1.rt56.1296.el7-RT-BUGGY-DEBUG-x86_64

• rt79z-kernel-rt-3.10.0-1160.144.1.rt56.1296.el7-RT-BUGGY-x86_64

Description

The automated test suite execution for TEST #37 (LLVM search and compile) is failing across RT-specific kernel builds. The logs indicate that the perf test tool cannot find a valid clang executable to handle BPF compilation.

Technical Breakdown

1. 1. Missing Dependency: The test environment lacks clang or llvm (version 3.7+ required).

1. 1. Architecture/Kernel: While these are el7 (RHEL 7) systems, the RT kernels require a properly linked LLVM toolchain to support BPF features backported to the 3.10 series.

1. 1. SELinux Context: SELinux is Enforcing. We need to verify if the test user has the permissions to execute clang or if the binary is simply missing from $PATH.

Supporting Logs:

ERROR: unable to find clang.
Hint: Try to install latest clang/llvm to support BPF. 
Check your $PATH and 'clang-path' option in [llvm] section of ~/.perfconfig.
LLVM 3.7 or newer is required.
...
LLVM search and compile subtest 1: FAILED!

JOB id:
https://beaker.engineering.redhat.com/jobs/12083210
https://beaker.engineering.redhat.com/jobs/12083215