Single math expression can freeze AI agents indefinitely due to Python GIL flaw

A developer discovered that a single line of Python math — '10 ** 10 ** 8' — can permanently freeze the smolagents AI framework, bypassing its built-in 2-second timeout. The bug exists because CPython computes large arbitrary-precision exponentiation entirely within one C-level call, holding the GIL throughout and never yielding control to the timeout watchdog thread. As a result, the main thread never arms the timer and the entire host process stalls silently, with no crash, no error message, and no monitoring event fired. The issue affects smolagents version 1.26.0 and is particularly dangerous because AI agents routinely attempt large numerical computations. The developer worked around the flaw by adding an external supervisor process that kills and reports the frozen worker, since thread-based timeouts alone cannot interrupt GIL-holding C operations.