Flake in gcsio.py / filesystemio.py - NotImplementedError: offset: 0, whence: 0

Traceback (most recent call last):
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/sdks/python/apache_beam/io/gcp/gcsio.py", line 583, in _start_upload
08:42:57     self._client.objects.Insert(self._insert_request, upload=self._upload)
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/sdks/python/apache_beam/io/gcp/internal/clients/storage/storage_v1_client.py", line 1154, in Insert
08:42:57     upload=upload, upload_config=upload_config)
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/build/gradleenv/1327086738/local/lib/python2.7/site-packages/apitools/base/py/base_api.py", line 715, in _RunMethod
08:42:57     http_request, client=self.client)
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/build/gradleenv/1327086738/local/lib/python2.7/site-packages/apitools/base/py/transfer.py", line 885, in InitializeUpload
08:42:57     return self.StreamInChunks()
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/build/gradleenv/1327086738/local/lib/python2.7/site-packages/apitools/base/py/transfer.py", line 997, in StreamInChunks
08:42:57     additional_headers=additional_headers)
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/build/gradleenv/1327086738/local/lib/python2.7/site-packages/apitools/base/py/transfer.py", line 948, in __StreamMedia
08:42:57     self.RefreshResumableUploadState()
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/build/gradleenv/1327086738/local/lib/python2.7/site-packages/apitools/base/py/transfer.py", line 850, in RefreshResumableUploadState
08:42:57     self.stream.seek(self.progress)
08:42:57   File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_Python_Verify_PR/src/sdks/python/apache_beam/io/filesystemio.py", line 269, in seek
08:42:57     offset, whence, self.position, self.last_position))
08:42:57 NotImplementedError: offset: 0, whence: 0, position: 48944, last: 0