diff --git a/Tools/gdb/libpython.py b/Tools/gdb/libpython.py
--- a/Tools/gdb/libpython.py
+++ b/Tools/gdb/libpython.py
@@ -1462,7 +1462,8 @@
         # This assumes the _POSIX_THREADS version of Python/ceval_gil.h:
         name = self._gdbframe.name()
         if name:
-            return name.startswith('pthread_cond_timedwait')
+            return name.startswith('pthread_cond_timedwait') \
+                or name.startswith('__pthread_cond_timedwait') # issue 17833
 
     def is_gc_collect(self):
         '''Is this frame "collect" within the garbage-collector?'''