Reset alarm signal when the function is ended (#29706)

Fixes #29690

src/transformers/dynamic_module_utils.py

@@ -592,8 +592,9 @@ def resolve_trust_remote_code(trust_remote_code, model_name, has_local_code, has
         if has_local_code:
             trust_remote_code = False
         elif has_remote_code and TIME_OUT_REMOTE_CODE > 0:
+            prev_sig_handler = None
             try:
-                signal.signal(signal.SIGALRM, _raise_timeout_error)
+                prev_sig_handler = signal.signal(signal.SIGALRM, _raise_timeout_error)
                 signal.alarm(TIME_OUT_REMOTE_CODE)
                 while trust_remote_code is None:
                     answer = input(
@@ -614,6 +615,10 @@ def resolve_trust_remote_code(trust_remote_code, model_name, has_local_code, has
                     f"load the model. You can inspect the repository content at https://hf.co/{model_name}.\n"
                     f"Please pass the argument `trust_remote_code=True` to allow custom code to be run."
                 )
+            finally:
+                if prev_sig_handler is not None:
+                    signal.signal(signal.SIGALRM, prev_sig_handler)
+                    signal.alarm(0)
         elif has_remote_code:
             # For the CI which puts the timeout at 0
             _raise_timeout_error(None, None)