diagnosing what is actually happening seems non trivial. networks are hard. regardless, we maybe we should catch exceptions like this and retry.. 02:06:54 INFO - retry: Giving up on <bound method Key.get_contents_to_filename of <Key: net-mozaws-prod-delivery-firefox,pub/firefox/candidates/43.0-candidates/build1/update/linux-x86_64/bn-IN/firefox-40.0.3-43.0.partial.mar>> 02:06:54 INFO - Downloading pub/firefox/candidates/43.0-candidates/build1/update/mac/hy-AM/firefox-43.0b9-43.0.partial.mar to cache/update/mac/hy-AM/firefox-43.0b9-43.0.partial.mar 02:06:54 FATAL - Uncaught exception: Traceback (most recent call last): 02:06:54 FATAL - File "/builds/slave/rel-m-rel-av-00000000000000000/scripts/mozharness/base/script.py", line 1698, in run 02:06:54 FATAL - self.run_action(action) 02:06:54 FATAL - File "/builds/slave/rel-m-rel-av-00000000000000000/scripts/mozharness/base/script.py", line 1640, in run_action 02:06:54 FATAL - self._possibly_run_method(method_name, error_if_missing=True) 02:06:54 FATAL - File "/builds/slave/rel-m-rel-av-00000000000000000/scripts/mozharness/base/script.py", line 1581, in _possibly_run_method 02:06:54 FATAL - return getattr(self, method_name)() 02:06:54 FATAL - File "scripts/scripts/release/antivirus.py", line 177, in get_files 02:06:54 FATAL - pool.map(worker, find_release_files()) 02:06:54 FATAL - File "/tools/python27/lib/python2.7/multiprocessing/pool.py", line 227, in map 02:06:54 FATAL - return self.map_async(func, iterable, chunksize).get() 02:06:54 FATAL - File "/tools/python27/lib/python2.7/multiprocessing/pool.py", line 528, in get 02:06:54 FATAL - raise self._value 02:06:54 FATAL - IncompleteRead: IncompleteRead(0 bytes read, 12154953 more expected) 02:06:54 FATAL - Running post_fatal callback... 02:06:54 FATAL - Exiting -1 program finished with exit code 255