https://treeherder.mozilla.org/logviewer.html#?job_id=76367588&repo=autoland [task 2017-02-10T16:48:41.417208Z] 16:48:41 INFO - TEST-START | dom/xhr/tests/browser_blobFromFile.js [task 2017-02-10T16:48:42.420044Z] 16:48:42 INFO - TEST-INFO | started process screentopng [task 2017-02-10T16:48:44.225315Z] 16:48:44 INFO - TEST-INFO | screentopng: exit 0 [task 2017-02-10T16:48:44.225728Z] 16:48:44 INFO - Buffered messages logged at 16:48:41 [task 2017-02-10T16:48:44.225936Z] 16:48:44 INFO - Entering test bound test [task 2017-02-10T16:48:44.229301Z] 16:48:44 INFO - Opening url: file:///tmp/tmp8EncaJ.mozrunner/ [task 2017-02-10T16:48:44.231211Z] 16:48:44 INFO - Buffered messages finished [task 2017-02-10T16:48:44.232995Z] 16:48:44 INFO - TEST-UNEXPECTED-FAIL | dom/xhr/tests/browser_blobFromFile.js | We have a file - [task 2017-02-10T16:48:44.234522Z] 16:48:44 INFO - Stack trace: [task 2017-02-10T16:48:44.238396Z] 16:48:44 INFO - chrome://mochitests/content/browser/dom/xhr/tests/browser_blobFromFile.js:test:34 [task 2017-02-10T16:48:44.240175Z] 16:48:44 INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:735:9 [task 2017-02-10T16:48:44.242012Z] 16:48:44 INFO - Tester.prototype.nextTest</<@chrome://mochikit/content/browser-test.js:655:7 [task 2017-02-10T16:48:44.243697Z] 16:48:44 INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:744:59 [task 2017-02-10T16:48:44.245519Z] 16:48:44 INFO - TEST-PASS | dom/xhr/tests/browser_blobFromFile.js | The size matches - [task 2017-02-10T16:48:44.247347Z] 16:48:44 INFO - Not taking screenshot here: see the one that was previously logged [task 2017-02-10T16:48:44.250269Z] 16:48:44 INFO - TEST-UNEXPECTED-FAIL | dom/xhr/tests/browser_blobFromFile.js | The name is correct - Got undefined, expected prefs.js [task 2017-02-10T16:48:44.252362Z] 16:48:44 INFO - Stack trace: [task 2017-02-10T16:48:44.256122Z] 16:48:44 INFO - chrome://mochikit/content/browser-test.js:test_is:911 [task 2017-02-10T16:48:44.258089Z] 16:48:44 INFO - chrome://mochitests/content/browser/dom/xhr/tests/browser_blobFromFile.js:test:38 [task 2017-02-10T16:48:44.259809Z] 16:48:44 INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:735:9 [task 2017-02-10T16:48:44.261529Z] 16:48:44 INFO - Tester.prototype.nextTest</<@chrome://mochikit/content/browser-test.js:655:7 [task 2017-02-10T16:48:44.263473Z] 16:48:44 INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:744:59 [task 2017-02-10T16:48:44.265541Z] 16:48:44 INFO - Leaving test bound test

Failure frequency has increased a lot in the last few days. :baku - Can you make this test more reliable?

this is primarily on opt but a few instances on asan/debug/pgo. here is a recent link from a debug log: https://treeherder.mozilla.org/logviewer.html#?repo=try&job_id=91975118&lineNumber=6159 in the log I see: [task 2017-04-16T19:41:28.022415Z] 19:41:28 INFO - TEST-START | dom/xhr/tests/browser_blobFromFile.js [task 2017-04-16T19:41:28.026743Z] 19:41:28 INFO - GECKO(2183) | Chrome file doesn't exist: /home/worker/workspace/build/tests/mochitest/browser/dom/xhr/tests/head.js [task 2017-04-16T19:41:28.164655Z] 19:41:28 INFO - GECKO(2183) | ++DOMWINDOW == 20 (0x7f20f7eca000) [pid = 2183] [serial = 20] [outer = 0x7f20f7eb4800] [task 2017-04-16T19:41:28.229364Z] 19:41:28 INFO - GECKO(2183) | ++DOCSHELL 0x7f20f6c19800 == 9 [pid = 2183] [id = {4591d590-e8f2-4beb-9f07-558ba603a306}] [task 2017-04-16T19:41:28.231268Z] 19:41:28 INFO - GECKO(2183) | ++DOMWINDOW == 21 (0x7f20f6c1a000) [pid = 2183] [serial = 21] [outer = (nil)] [task 2017-04-16T19:41:28.306872Z] 19:41:28 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:28.308852Z] 19:41:28 INFO - GECKO(2183) | ++DOMWINDOW == 22 (0x7f20f6c20800) [pid = 2183] [serial = 22] [outer = 0x7f20f6c1a000] [task 2017-04-16T19:41:28.310380Z] 19:41:28 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:28.326119Z] 19:41:28 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:28.677488Z] 19:41:28 INFO - GECKO(2183) | ++DOMWINDOW == 23 (0x7f20f6903000) [pid = 2183] [serial = 23] [outer = 0x7f20f6c1a000] [task 2017-04-16T19:41:28.725922Z] 19:41:28 INFO - GECKO(2183) | [2183] WARNING: Failed to retarget HTML data delivery to the parser thread.: file /home/worker/workspace/build/src/parser/html/nsHtml5StreamParser.cpp, line 985 [task 2017-04-16T19:41:29.333215Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.336318Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.338228Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.340090Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.341975Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.343834Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.354885Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.356218Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.357674Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.359043Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.361277Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.363543Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.366158Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.368602Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.370689Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.377278Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:29.966934Z] 19:41:29 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/dom/xhr/XMLHttpRequestMainThread.cpp, line 2000 [task 2017-04-16T19:41:30.270149Z] 19:41:30 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/dom/xhr/XMLHttpRequestMainThread.cpp, line 2000 [task 2017-04-16T19:41:30.635804Z] 19:41:30 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:30.643579Z] 19:41:30 INFO - GECKO(2183) | [2183] WARNING: 'NS_FAILED(rv)', file /home/worker/workspace/build/src/caps/BasePrincipal.cpp, line 380 [task 2017-04-16T19:41:32.364895Z] 19:41:32 INFO - TEST-INFO | started process screentopng [task 2017-04-16T19:41:33.721971Z] 19:41:33 INFO - TEST-INFO | screentopng: exit 0 [task 2017-04-16T19:41:33.723935Z] 19:41:33 INFO - Buffered messages logged at 19:41:28 [task 2017-04-16T19:41:33.726138Z] 19:41:33 INFO - Entering test bound test [task 2017-04-16T19:41:33.727932Z] 19:41:33 INFO - Opening url: file:///tmp/tmpnesJT0.mozrunner/ [task 2017-04-16T19:41:33.730172Z] 19:41:33 INFO - Buffered messages finished [task 2017-04-16T19:41:33.733608Z] 19:41:33 INFO - TEST-UNEXPECTED-FAIL | dom/xhr/tests/browser_blobFromFile.js | We have a file - [task 2017-04-16T19:41:33.735242Z] 19:41:33 INFO - Stack trace: [task 2017-04-16T19:41:33.737211Z] 19:41:33 INFO - chrome://mochitests/content/browser/dom/xhr/tests/browser_blobFromFile.js:test:38 [task 2017-04-16T19:41:33.739233Z] 19:41:33 INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:752:9 [task 2017-04-16T19:41:33.743646Z] 19:41:33 INFO - Tester.prototype.nextTest</<@chrome://mochikit/content/browser-test.js:672:7 [task 2017-04-16T19:41:33.748527Z] 19:41:33 INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:791:59 [task 2017-04-16T19:41:33.750542Z] 19:41:33 INFO - TEST-PASS | dom/xhr/tests/browser_blobFromFile.js | The size matches - [task 2017-04-16T19:41:33.752536Z] 19:41:33 INFO - Not taking screenshot here: see the one that was previously logged [task 2017-04-16T19:41:33.758152Z] 19:41:33 INFO - TEST-UNEXPECTED-FAIL | dom/xhr/tests/browser_blobFromFile.js | The name is correct - Got undefined, expected prefs.js [task 2017-04-16T19:41:33.759900Z] 19:41:33 INFO - Stack trace: [task 2017-04-16T19:41:33.761536Z] 19:41:33 INFO - chrome://mochikit/content/browser-test.js:test_is:928 [task 2017-04-16T19:41:33.764498Z] 19:41:33 INFO - chrome://mochitests/content/browser/dom/xhr/tests/browser_blobFromFile.js:test:42 [task 2017-04-16T19:41:33.766552Z] 19:41:33 INFO - Tester_execTest@chrome://mochikit/content/browser-test.js:752:9 [task 2017-04-16T19:41:33.768336Z] 19:41:33 INFO - Tester.prototype.nextTest</<@chrome://mochikit/content/browser-test.js:672:7 [task 2017-04-16T19:41:33.770123Z] 19:41:33 INFO - SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<@chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:791:59 [task 2017-04-16T19:41:33.772288Z] 19:41:33 INFO - Leaving test bound test [task 2017-04-16T19:41:33.774435Z] 19:41:33 INFO - GECKO(2183) | MEMORY STAT vsizeMaxContiguous not supported in this build configuration. [task 2017-04-16T19:41:33.776497Z] 19:41:33 INFO - GECKO(2183) | MEMORY STAT | vsize 1990MB | residentFast 290MB | heapAllocated 134MB [task 2017-04-16T19:41:33.778610Z] 19:41:33 INFO - TEST-OK | dom/xhr/tests/browser_blobFromFile.js | took 5448ms here is the screenshot: https://public-artifacts.taskcluster.net/C5CTPkiQT2-030hMVd40Ww/0/public/test_info//mozilla-test-fail-screenshot_ewtJcT.png I believe this test is failing here: https://dxr.mozilla.org/mozilla-central/source/dom/xhr/tests/browser_blobFromFile.js?q=path%3Abrowser_blobFromFile.js&redirect_type=single#38

this seems to be fixed as of april 24th, no specific reason that I know of.