In this log: https://tbpl.mozilla.org/php/getParsedLog.php?id=28054340&tree=B2g-Inbound We have: { 11:21:33 INFO - ##### 11:21:33 INFO - ##### Running update-source-manifest step. 11:21:33 INFO - ##### 11:21:33 INFO - Running main action method: update_source_manifest 11:21:33 INFO - Reading from file /builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml.original 11:21:33 INFO - Found git_base_url of https://git.mozilla.org/releases/ in manifest. 11:21:33 INFO - Writing to file /builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml 11:21:33 INFO - Running command: ['diff', '-u', '/builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml.original', '/builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml'] 11:21:33 INFO - Copy/paste: diff -u /builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml.original /builds/slave/b2g_b2g-in_nexus-4_dep-0000000/build/sources.xml 11:21:33 ERROR - Return code: 0 } 11:21:33 ERROR - Return code: 0 -> either there was an error or there wasn't. This line should either be "INFO - ..." or "ERROR - Return code <non_zero>".