Theset_exception_macro in_remote_debugging.h only set exceptions whenunwinder->debug wasTrue:

  #define set_exception_cause(unwinder, exc_type, message) \      if (unwinder->debug) { \          _set_debug_exception_cause(exc_type, message); \      }

This violates C Python API contract: functions returning NULL or -1 to indicate errors must always set an exception. Whendebug=False (default), the macro did nothing, causing the function to return an error without setting an exception.

Modifiesset_exception_cause to always set an exception while preserving the intended behavior ofdebug flag.

• Issue:RemoteUnwinder.get_stack_trace is missing exceptions on some error code paths #144316