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Description
I build LLVM and clang with -DCLANG_BOLT=INSTRUMENT and run into a problem during the test phase that is supposed to generate the instrumentation profile which is later used to optimize the binary. Here are the steps to reproduce this in a mock environment.
$ git clone -b bolt https://src.fedoraproject.org/forks/kkleine/rpms/llvm.git
$ cd llvm
$ make mockbuild-snapshot YYYYMMDD=20250707Once that runs into the error further down and you want to debug and inspect or re-run commands you can do that like so:
$ make mock-install-debugging-tools
$ make mock-shell
bash-5.2# Here's the error:
Patching execution environment for dynamic libraries: /builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf5
5243733/llvm/redhat-linux-build/./bin/clang-cxx-bolt.inst /builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198f
acf55243733/llvm/redhat-linux-build/./bin/LLVM-bolt.inst
Running: /usr/bin/python3 /builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf55243733/llvm/redhat-linux-bu
ild/./bin/llvm-lit -v /builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf55243733/llvm/redhat-linux-build/
tools/clang/tools/driver/../../utils/perf-training/bolt-fdata
Traceback (most recent call last):
File "/builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf55243733/clang/tools/driver/../../utils/perf-tr
aining/perf-helper.py", line 718, in <module>
main()
~~~~^^
File "/builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf55243733/clang/tools/driver/../../utils/perf-tr
aining/perf-helper.py", line 714, in main
sys.exit(f(sys.argv[2:]))
~^^^^^^^^^^^^^^
File "/builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe198facf55243733/clang/tools/driver/../../utils/perf-tr
aining/perf-helper.py", line 659, in bolt_optimize
process.check_returncode()
~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib64/python3.14/subprocess.py", line 508, in check_returncode
raise CalledProcessError(self.returncode, self.args, self.stdout,
self.stderr)
subprocess.CalledProcessError: Command '['/usr/bin/python3', '/builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2fe
198facf55243733/llvm/redhat-linux-build/./bin/llvm-lit', '-v', '/builddir/build/BUILD/llvm-21.0.0_pre20250707.g408e87184f8274-build/llvm-project-408e87184f8274e30d188a2
fe198facf55243733/llvm/redhat-linux-build/tools/clang/tools/driver/../../utils/perf-training/bolt-fdata']' died with <Signals.SIGSEGV: 11>.