bpo-44472: Fix ltrace functionality when exceptions are raised (GH-26822)

Author: pablogsal

Misc/NEWS.d/next/Core and Builtins/2021-06-21-11-19-54.bpo-44472.Vvm1yn.rst

@@ -0,0 +1 @@
+Fix ltrace functionality when exceptions are raised. Patch by Pablo Galindo

Python/ceval.c

@@ -5325,11 +5325,14 @@ static int
 prtrace(PyThreadState *tstate, PyObject *v, const char *str)
 {
     printf("%s ", str);
+    PyObject *type, *value, *traceback;
+    PyErr_Fetch(&type, &value, &traceback);
     if (PyObject_Print(v, stdout, 0) != 0) {
         /* Don't know what else to do */
         _PyErr_Clear(tstate);
     }
     printf("\n");
+    PyErr_Restore(type, value, traceback);
     return 1;
 }
 #endif