On hardened kernels / newer glibc (e.g. WSL2 glibc 2.43) CTranslate2's shared
object is rejected at load with 'libctranslate2…cannot enable executable stack'
— an OSError, not ImportError. The WhisperX/faster-whisper is_available() probes
only caught ImportError, so the OSError escaped and crashed the ASR/dub
preflight ('ASR backend initialization failed: …').
- Both probes now also catch the non-ImportError load failure and REPORT
(False, 'failed to load …') instead of raising — a probe must never raise.
- _auto_detect() routes every probe through a never-raising _probe_available()
so no exploding probe can crash engine selection; it falls through to
pytorch-whisper (transformers, no CTranslate2), which works on CUDA/CPU.
Regression tests cover the raising probe, the .so-load OSError surfacing as
unavailable, and auto-detect falling back to pytorch-whisper.
Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
