Bug: Intermittent newtab/test/browser/abouthomecache/browser_disabled.js | Cleanup function threw an exception - undefined - threw exception: [Exception... "Component returned failure code: 0x80470002 (NS_BASE_STREAM_CLOSED) [nsIInputStream.available]"  nsresu
Status: RESOLVED
Priority: P5
Resolution: DUPLICATE
Created: 2020-12-02 06:49:19+00:00
Resolved: 2022-04-09 15:00:24+00:00

**Filed by:** malexandru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=323264450&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Ny5vVVI6Stay_Bb1o9C4QQ/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2020-12-02T05:43:32.508Z] 05:43:32     INFO - TEST-OK | browser/components/newtab/test/browser/abouthomecache/browser_bump_version.js | took 2139ms
[task 2020-12-02T05:43:32.556Z] 05:43:32     INFO - checking window state
[task 2020-12-02T05:43:32.572Z] 05:43:32     INFO - GECKO(4314) | JavaScript error: resource://gre/modules/remotepagemanager/MessagePort.jsm, line 236: Error: Message port has been destroyed
[task 2020-12-02T05:43:32.572Z] 05:43:32     INFO - GECKO(4314) | JavaScript error: resource://activity-stream/data/content/activity-stream.bundle.js, line 10931: InvalidStateError: An exception was thrown
[task 2020-12-02T05:43:32.592Z] 05:43:32     INFO - TEST-START | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js
[task 2020-12-02T05:43:33.929Z] 05:43:33     INFO - GECKO(4314) | console.warn: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAA/UlEQVR4nO3RMQ0AMAzAsPIn3d5DsBw2gkiZJWV+B/AyJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQGENiDIkxJMaQmAP4K6zWNUjE4wAAAABJRU5ErkJggg== is not allowed for anchor targets."
[task 2020-12-02T05:43:34.038Z] 05:43:34     INFO - GECKO(4314) | JavaScript error: resource://gre/modules/PromiseWorker.jsm, line 413: Error: Internal error: worker terminated
[task 2020-12-02T05:43:34.571Z] 05:43:34     INFO - GECKO(4314) | JavaScript error: resource://gre/modules/remotepagemanager/MessagePort.jsm, line 236: Error: Message port has been destroyed
[task 2020-12-02T05:43:34.572Z] 05:43:34     INFO - GECKO(4314) | JavaScript error: resource://activity-stream/data/content/activity-stream.bundle.js, line 10931: InvalidStateError: An exception was thrown
[task 2020-12-02T05:43:35.401Z] 05:43:35     INFO - GECKO(4314) | JavaScript error: resource://gre/modules/remotepagemanager/MessagePort.jsm, line 236: Error: Message port has been destroyed
[task 2020-12-02T05:43:35.401Z] 05:43:35     INFO - GECKO(4314) | JavaScript error: resource://activity-stream/data/content/activity-stream.bundle.js, line 10931: InvalidStateError: An exception was thrown
[task 2020-12-02T05:43:37.966Z] 05:43:37     INFO - TEST-INFO | started process screentopng
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - TEST-INFO | screentopng: exit 0
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Buffered messages logged at 05:43:32
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Entering test bound test_cache_disabled
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: [JavaScript Error: "Error: Message port has been destroyed" {file: "resource://gre/modules/remotepagemanager/MessagePort.jsm" line: 236}]
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - sendAsyncMessage@resource://gre/modules/remotepagemanager/MessagePort.jsm:236:13
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - NewtabRenderUtils</</messageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10931:24
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - NewtabRenderUtils</</rehydrationMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10954:14
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - NewtabRenderUtils</</queueEarlyMessageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:11004:11
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - _dispatchImpressionStats@resource://activity-stream/data/content/activity-stream.bundle.js:5371:13
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - NewtabRenderUtils</</setImpressionObserver/this._handleIntersect@resource://activity-stream/data/content/activity-stream.bundle.js:5474:14
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - 
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: [JavaScript Error: "InvalidStateError: An exception was thrown" {file: "resource://activity-stream/data/content/activity-stream.bundle.js" line: 10931}]
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Buffered messages logged at 05:43:33
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Simulating restart of the browser
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Simulating shutdown write
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: 1606887813000	AboutHomeStartupCache	TRACE	Never wrote a cache this session. Arming cache task.
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: 1606887813004	AboutHomeStartupCache	TRACE	Finalizing cache task on shutdown
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: 1606887813006	AboutHomeStartupCache	TRACE	Caching now.
[task 2020-12-02T05:43:38.426Z] 05:43:38     INFO - Console message: 1606887813006	AboutHomeStartupCache	TRACE	Parent is requesting Activity Stream state object.
[task 2020-12-02T05:43:38.428Z] 05:43:38     INFO - Console message: 1606887813006	AboutHomeStartupCache	TRACE	Parent is requesting cache streams.
[task 2020-12-02T05:43:38.428Z] 05:43:38     INFO - Buffered messages logged at 05:43:34
[task 2020-12-02T05:43:38.430Z] 05:43:38     INFO - Shutdown write done
[task 2020-12-02T05:43:38.431Z] 05:43:38     INFO - Waiting for AboutHomeStartupCacheChild to uninit
[task 2020-12-02T05:43:38.434Z] 05:43:38     INFO - Console message: [JavaScript Error: "1606887814012	AboutHomeStartupCache	ERROR	Timed out getting cache streams. Skipping cache task." {file: "resource://gre/modules/Log.jsm" line: 723}]
[task 2020-12-02T05:43:38.434Z] 05:43:38     INFO - append@resource://gre/modules/Log.jsm:723:12
[task 2020-12-02T05:43:38.435Z] 05:43:38     INFO - log@resource://gre/modules/Log.jsm:379:16
[task 2020-12-02T05:43:38.436Z] 05:43:38     INFO - error@resource://gre/modules/Log.jsm:387:10
[task 2020-12-02T05:43:38.436Z] 05:43:38     INFO - cacheNow@resource:///modules/BrowserGlue.jsm:5105:18
[task 2020-12-02T05:43:38.437Z] 05:43:38     INFO - 
[task 2020-12-02T05:43:38.437Z] 05:43:38     INFO - Console message: 1606887814012	AboutHomeStartupCache	TRACE	Uninitialized.
[task 2020-12-02T05:43:38.438Z] 05:43:38     INFO - AboutHomeStartupCacheChild uninitted
[task 2020-12-02T05:43:38.440Z] 05:43:38     INFO - Waiting for about:home to load
[task 2020-12-02T05:43:38.441Z] 05:43:38     INFO - Console message: [JavaScript Error: "Error: Internal error: worker terminated" {file: "resource://gre/modules/PromiseWorker.jsm" line: 413}]
[task 2020-12-02T05:43:38.441Z] 05:43:38     INFO - about:home loaded
[task 2020-12-02T05:43:38.442Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | There should be no page scripts. - 0 == 0 - 
[task 2020-12-02T05:43:38.443Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should not have found window.__FROM_STARTUP_CACHE__ - "undefined" == "undefined" - 
[task 2020-12-02T05:43:38.443Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found activity-stream class on <body> element - true == true - 
[task 2020-12-02T05:43:38.444Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found the Discovery Stream top sites. - {} == true - 
[task 2020-12-02T05:43:38.444Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Expected the right value set to browser.startup.abouthome_cache_result scalar. - 7 == 7 - 
[task 2020-12-02T05:43:38.444Z] 05:43:38     INFO - Leaving test bound test_cache_disabled
[task 2020-12-02T05:43:38.447Z] 05:43:38     INFO - Entering test bound test_cache_custom_homepage
[task 2020-12-02T05:43:38.448Z] 05:43:38     INFO - Console message: [JavaScript Error: "Error: Message port has been destroyed" {file: "resource://gre/modules/remotepagemanager/MessagePort.jsm" line: 236}]
[task 2020-12-02T05:43:38.449Z] 05:43:38     INFO - sendAsyncMessage@resource://gre/modules/remotepagemanager/MessagePort.jsm:236:13
[task 2020-12-02T05:43:38.453Z] 05:43:38     INFO - NewtabRenderUtils</</messageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10931:24
[task 2020-12-02T05:43:38.454Z] 05:43:38     INFO - NewtabRenderUtils</</rehydrationMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10954:14
[task 2020-12-02T05:43:38.454Z] 05:43:38     INFO - NewtabRenderUtils</</queueEarlyMessageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:11004:11
[task 2020-12-02T05:43:38.455Z] 05:43:38     INFO - _dispatchImpressionStats@resource://activity-stream/data/content/activity-stream.bundle.js:5371:13
[task 2020-12-02T05:43:38.455Z] 05:43:38     INFO - NewtabRenderUtils</</setImpressionObserver/this._handleIntersect@resource://activity-stream/data/content/activity-stream.bundle.js:5474:14
[task 2020-12-02T05:43:38.456Z] 05:43:38     INFO - 
[task 2020-12-02T05:43:38.456Z] 05:43:38     INFO - Console message: [JavaScript Error: "InvalidStateError: An exception was thrown" {file: "resource://activity-stream/data/content/activity-stream.bundle.js" line: 10931}]
[task 2020-12-02T05:43:38.458Z] 05:43:38     INFO - Simulating restart of the browser
[task 2020-12-02T05:43:38.458Z] 05:43:38     INFO - Intentionally skipping shutdown write
[task 2020-12-02T05:43:38.459Z] 05:43:38     INFO - Waiting for AboutHomeStartupCacheChild to uninit
[task 2020-12-02T05:43:38.460Z] 05:43:38     INFO - AboutHomeStartupCacheChild uninitted
[task 2020-12-02T05:43:38.462Z] 05:43:38     INFO - Waiting for about:home to load
[task 2020-12-02T05:43:38.462Z] 05:43:38     INFO - Console message: 1606887814943	AboutHomeStartupCache	TRACE	Initting.
[task 2020-12-02T05:43:38.463Z] 05:43:38     INFO - Console message: 1606887814943	AboutHomeStartupCache	TRACE	Not configured to load about:home by default.
[task 2020-12-02T05:43:38.464Z] 05:43:38     INFO - Buffered messages logged at 05:43:35
[task 2020-12-02T05:43:38.465Z] 05:43:38     INFO - about:home loaded
[task 2020-12-02T05:43:38.465Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | There should be no page scripts. - 0 == 0 - 
[task 2020-12-02T05:43:38.466Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should not have found window.__FROM_STARTUP_CACHE__ - "undefined" == "undefined" - 
[task 2020-12-02T05:43:38.466Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found activity-stream class on <body> element - true == true - 
[task 2020-12-02T05:43:38.467Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found the Discovery Stream top sites. - {} == true - 
[task 2020-12-02T05:43:38.467Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Expected the right value set to browser.startup.abouthome_cache_result scalar. - 8 == 8 - 
[task 2020-12-02T05:43:38.472Z] 05:43:38     INFO - Leaving test bound test_cache_custom_homepage
[task 2020-12-02T05:43:38.473Z] 05:43:38     INFO - Entering test bound test_cache_restore_session
[task 2020-12-02T05:43:38.473Z] 05:43:38     INFO - Console message: [JavaScript Error: "Error: Message port has been destroyed" {file: "resource://gre/modules/remotepagemanager/MessagePort.jsm" line: 236}]
[task 2020-12-02T05:43:38.474Z] 05:43:38     INFO - sendAsyncMessage@resource://gre/modules/remotepagemanager/MessagePort.jsm:236:13
[task 2020-12-02T05:43:38.474Z] 05:43:38     INFO - NewtabRenderUtils</</messageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10931:24
[task 2020-12-02T05:43:38.475Z] 05:43:38     INFO - NewtabRenderUtils</</rehydrationMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:10954:14
[task 2020-12-02T05:43:38.476Z] 05:43:38     INFO - NewtabRenderUtils</</queueEarlyMessageMiddleware/</<@resource://activity-stream/data/content/activity-stream.bundle.js:11004:11
[task 2020-12-02T05:43:38.476Z] 05:43:38     INFO - _dispatchImpressionStats@resource://activity-stream/data/content/activity-stream.bundle.js:5371:13
[task 2020-12-02T05:43:38.476Z] 05:43:38     INFO - NewtabRenderUtils</</setImpressionObserver/this._handleIntersect@resource://activity-stream/data/content/activity-stream.bundle.js:5474:14
[task 2020-12-02T05:43:38.476Z] 05:43:38     INFO - 
[task 2020-12-02T05:43:38.477Z] 05:43:38     INFO - Console message: [JavaScript Error: "InvalidStateError: An exception was thrown" {file: "resource://activity-stream/data/content/activity-stream.bundle.js" line: 10931}]
[task 2020-12-02T05:43:38.477Z] 05:43:38     INFO - Simulating restart of the browser
[task 2020-12-02T05:43:38.478Z] 05:43:38     INFO - Intentionally skipping shutdown write
[task 2020-12-02T05:43:38.480Z] 05:43:38     INFO - Waiting for AboutHomeStartupCacheChild to uninit
[task 2020-12-02T05:43:38.481Z] 05:43:38     INFO - Console message: 1606887815682	AboutHomeStartupCache	TRACE	Uninitialized.
[task 2020-12-02T05:43:38.482Z] 05:43:38     INFO - AboutHomeStartupCacheChild uninitted
[task 2020-12-02T05:43:38.483Z] 05:43:38     INFO - Waiting for about:home to load
[task 2020-12-02T05:43:38.483Z] 05:43:38     INFO - Console message: 1606887815747	AboutHomeStartupCache	TRACE	Initting.
[task 2020-12-02T05:43:38.483Z] 05:43:38     INFO - Console message: 1606887815747	AboutHomeStartupCache	TRACE	Not configured to load about:home by default.
[task 2020-12-02T05:43:38.483Z] 05:43:38     INFO - about:home loaded
[task 2020-12-02T05:43:38.483Z] 05:43:38     INFO - Buffered messages logged at 05:43:36
[task 2020-12-02T05:43:38.484Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | There should be no page scripts. - 0 == 0 - 
[task 2020-12-02T05:43:38.484Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should not have found window.__FROM_STARTUP_CACHE__ - "undefined" == "undefined" - 
[task 2020-12-02T05:43:38.485Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found activity-stream class on <body> element - true == true - 
[task 2020-12-02T05:43:38.485Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found the Discovery Stream top sites. - {} == true - 
[task 2020-12-02T05:43:38.486Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Expected the right value set to browser.startup.abouthome_cache_result scalar. - 8 == 8 - 
[task 2020-12-02T05:43:38.486Z] 05:43:38     INFO - Leaving test bound test_cache_restore_session
[task 2020-12-02T05:43:38.487Z] 05:43:38     INFO - Entering test bound test_cache_no_preloading
[task 2020-12-02T05:43:38.488Z] 05:43:38     INFO - Simulating restart of the browser
[task 2020-12-02T05:43:38.491Z] 05:43:38     INFO - Intentionally skipping shutdown write
[task 2020-12-02T05:43:38.491Z] 05:43:38     INFO - Waiting for AboutHomeStartupCacheChild to uninit
[task 2020-12-02T05:43:38.491Z] 05:43:38     INFO - Console message: 1606887816486	AboutHomeStartupCache	TRACE	Uninitialized.
[task 2020-12-02T05:43:38.493Z] 05:43:38     INFO - AboutHomeStartupCacheChild uninitted
[task 2020-12-02T05:43:38.494Z] 05:43:38     INFO - Waiting for about:home to load
[task 2020-12-02T05:43:38.494Z] 05:43:38     INFO - Console message: 1606887816562	AboutHomeStartupCache	TRACE	Initting.
[task 2020-12-02T05:43:38.495Z] 05:43:38     INFO - Console message: 1606887816562	AboutHomeStartupCache	TRACE	Preloaded about:newtab disabled.
[task 2020-12-02T05:43:38.496Z] 05:43:38     INFO - about:home loaded
[task 2020-12-02T05:43:38.496Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | There should be no page scripts. - 0 == 0 - 
[task 2020-12-02T05:43:38.497Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should not have found window.__FROM_STARTUP_CACHE__ - "undefined" == "undefined" - 
[task 2020-12-02T05:43:38.498Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found activity-stream class on <body> element - true == true - 
[task 2020-12-02T05:43:38.498Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Should have found the Discovery Stream top sites. - {} == true - 
[task 2020-12-02T05:43:38.499Z] 05:43:38     INFO - TEST-PASS | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Expected the right value set to browser.startup.abouthome_cache_result scalar. - 9 == 9 - 
[task 2020-12-02T05:43:38.499Z] 05:43:38     INFO - Buffered messages logged at 05:43:37
[task 2020-12-02T05:43:38.500Z] 05:43:38     INFO - Leaving test bound test_cache_no_preloading
[task 2020-12-02T05:43:38.501Z] 05:43:38     INFO - Simulating restart of the browser
[task 2020-12-02T05:43:38.501Z] 05:43:38     INFO - Intentionally skipping shutdown write
[task 2020-12-02T05:43:38.502Z] 05:43:38     INFO - Waiting for AboutHomeStartupCacheChild to uninit
[task 2020-12-02T05:43:38.504Z] 05:43:38     INFO - Console message: 1606887817420	AboutHomeStartupCache	TRACE	Uninitialized.
[task 2020-12-02T05:43:38.504Z] 05:43:38     INFO - AboutHomeStartupCacheChild uninitted
[task 2020-12-02T05:43:38.505Z] 05:43:38     INFO - Waiting for AboutHomeStartupCache cache entry
[task 2020-12-02T05:43:38.505Z] 05:43:38     INFO - Console message: 1606887817470	AboutHomeStartupCache	TRACE	Initting.
[task 2020-12-02T05:43:38.506Z] 05:43:38     INFO - Console message: 1606887817478	AboutHomeStartupCache	TRACE	Constructing pipes.
[task 2020-12-02T05:43:38.507Z] 05:43:38     INFO - Console message: 1606887817478	AboutHomeStartupCache	TRACE	Initialized.
[task 2020-12-02T05:43:38.511Z] 05:43:38     INFO - Console message: 1606887817479	AboutHomeStartupCache	TRACE	A privileged about content process is launching with ID 1.
[task 2020-12-02T05:43:38.512Z] 05:43:38     INFO - Console message: 1606887817479	AboutHomeStartupCache	INFO	Sending input streams down to content process.
[task 2020-12-02T05:43:38.512Z] 05:43:38     INFO - Got AboutHomeStartupCache cache entry
[task 2020-12-02T05:43:38.513Z] 05:43:38     INFO - Ensuring cache bytes are available
[task 2020-12-02T05:43:38.514Z] 05:43:38     INFO - Console message: 1606887817854	AboutHomeStartupCache	TRACE	Cache entry is available.
[task 2020-12-02T05:43:38.514Z] 05:43:38     INFO - Console message: 1606887817855	AboutHomeStartupCache	TRACE	Connecting nsICacheEntry to pipes.
[task 2020-12-02T05:43:38.515Z] 05:43:38     INFO - Console message: 1606887817855	AboutHomeStartupCache	TRACE	
[task 2020-12-02T05:43:38.516Z] 05:43:38     INFO - Console message: 1606887817855	AboutHomeStartupCache	DEBUG	Cache meta data does not exist. Closing streams.
[task 2020-12-02T05:43:38.516Z] 05:43:38     INFO - Buffered messages finished
[task 2020-12-02T05:43:38.517Z] 05:43:38     INFO - TEST-UNEXPECTED-FAIL | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Cleanup function threw an exception - undefined - threw exception: [Exception... "Component returned failure code: 0x80470002 (NS_BASE_STREAM_CLOSED) [nsIInputStream.available]"  nsresult: "0x80470002 (NS_BASE_STREAM_CLOSED)"  location: "JS frame :: chrome://mochitests/content/browser/browser/components/newtab/test/browser/abouthomecache/head.js :: <TOP_LEVEL> :: line 130"  data: no]
[task 2020-12-02T05:43:38.517Z] 05:43:38     INFO - GECKO(4314) | MEMORY STAT | vsize 20975172MB | residentFast 1076MB
[task 2020-12-02T05:43:38.518Z] 05:43:38     INFO - TEST-OK | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | took 5394ms
[task 2020-12-02T05:43:38.519Z] 05:43:38     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-12-02T05:43:38.519Z] 05:43:38     INFO - TEST-UNEXPECTED-FAIL | browser/components/newtab/test/browser/abouthomecache/browser_disabled.js | Found an unexpected tab at the end of test run: about:home - 
[task 2020-12-02T05:43:38.520Z] 05:43:38     INFO - checking window state
[task 2020-12-02T05:43:38.520Z] 05:43:38     INFO - TEST-START | browser/components/newtab/test/browser/abouthomecache/browser_locale_change.js```