https://tbpl.mozilla.org/php/getParsedLog.php?id=17540754&tree=Mozilla-Inbound Rev3 Fedora 12x64 mozilla-inbound pgo test mochitest-browser-chrome on 2012-12-02 13:25:29 PST for push 2b4151d4d695 slave: talos-r3-fed64-048 TEST-START | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js TEST-INFO | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | Makes sure the progress bar appears if firstSync pref is set TEST-PASS | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | progress bar should be visible TEST-INFO | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | Makes sure the progress bar is hidden if firstSync pref is not set TEST-PASS | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | pref DNE TEST-UNEXPECTED-FAIL | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | an unexpected uncaught JS exception reported through window.onerror - TypeError: progressBar is null at chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js:33 Stack trace: JS frame :: chrome://mochikit/content/tests/SimpleTest/SimpleTest.js :: simpletestOnerror :: line 1066 native frame :: <unknown filename> :: <TOP_LEVEL> :: line 0 TEST-INFO | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | Console message: [JavaScript Error: "TypeError: progressBar is null" {file: "chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js" line: 33}] TEST-UNEXPECTED-FAIL | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | Test timed out args: ['/home/cltbld/talos-slave/test/build/bin/screentopng'] SCREENSHOT: <see log> INFO TEST-END | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | finished in 30017ms TEST-UNEXPECTED-FAIL | chrome://mochitests/content/browser/browser/base/content/test/browser_aboutSyncProgress.js | Found a tab after previous test timed out: about:blank

1.) This appears to have been PGO-only. I retriggered the job two more times on that push and it continued to fail. 2.) This went away when bug 760036 was backed out.