1720070 - Permanent Talos RemoteAgent ERROR unable to stop listener: TypeError: can't access property "destructor", this.targetList is null(chrome://remote/content/cdp/CDP.jsm:92:5) JS Stack trace: [e-mail]:92:5 - DO NOT USE FOR CLASSIFICATION

Status: VERIFIED FIXED

(Remote Protocol :: CDP, defect, P2)

Description

[Treeherder Bug Filer]

Filed by: archaeopteryx [at] coole-files.de
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=344769982&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/RKQxQ3hhRtCaAlJCOFtLMA/runs/0/artifacts/public/logs/live_backing.log

---

This failure is not fatal (test still runs successfully) but gets picked up by Treeherder as failure line for every talos task.

[task 2021-07-09T09:19:28.396Z] 09:19:28     INFO -  TEST-INFO | started process 7860 (C:\Users\task_1625809681\build\application\firefox\firefox -wait-for-browser -no-deelevate http://127.0.0.1:49906/getInfo.html)
[task 2021-07-09T09:19:29.829Z] 09:19:29     INFO -  console.warn: SearchSettings: "get: No settings file exists, new profile?" (new NotFoundError("Could not open the file at C:\\Users\\task_1625809681\\AppData\\Local\\Temp\\tmpxw5yn4wl\\profile\\search.json.mozlz4", (void 0)))
[task 2021-07-09T09:19:30.147Z] 09:19:30     INFO -  __metrics
[task 2021-07-09T09:19:30.148Z] 09:19:30     INFO -  	Screen width/height: 1024/768
[task 2021-07-09T09:19:30.148Z] 09:19:30     INFO -  	colorDepth: 24
[task 2021-07-09T09:19:30.148Z] 09:19:30     INFO -  	Browser inner width/height: 1024/682
[task 2021-07-09T09:19:30.148Z] 09:19:30     INFO -  __metrics
[task 2021-07-09T09:19:30.273Z] 09:19:30     INFO -  JavaScript warning: resource://gre/modules/Troubleshoot.jsm, line 691: WebGL context was lost.
[task 2021-07-09T09:19:30.288Z] 09:19:30     INFO -  JavaScript warning: resource://gre/modules/Troubleshoot.jsm, line 691: WebGL context was lost.
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[task 2021-07-09T09:19:31.024Z] 09:19:31     INFO -  JavaScript error: resource:///modules/Interactions.jsm, line 209: NS_ERROR_FAILURE: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIUserIdleService.removeIdleObserver]
[task 2021-07-09T09:19:31.067Z] 09:19:31     INFO -  [Parent 6832, IPC I/O Parent] WARNING: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_win.cc:167
[task 2021-07-09T09:19:31.146Z] 09:19:31     INFO -  *** UTM:SVC TimerManager:registerTimer called after profile-before-change notification. Ignoring timer registration for id: recipe-client-addon-run
[task 2021-07-09T09:19:31.165Z] 09:19:31     INFO -  JavaScript error: resource:///modules/Discovery.jsm, line 104: NS_ERROR_NOT_AVAILABLE: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsICookieManager.remove]
[task 2021-07-09T09:19:31.305Z] 09:19:31     INFO -  ###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost
[task 2021-07-09T09:19:31.524Z] 09:19:31    ERROR -  1625822371524	RemoteAgent	ERROR	unable to stop listener: TypeError: can't access property "destructor", this.targetList is null(chrome://remote/content/cdp/CDP.jsm:92:5) JS Stack trace: [e-mail]:92:5
[task 2021-07-09T09:19:31.525Z] 09:19:31     INFO -  [e-mail]:138:21
[task 2021-07-09T09:19:31.579Z] 09:19:31     INFO -  TEST-INFO | 7860: exit 0

Comment 1

[Julian Descottes [:jdescottes]]

We now create cdp earlier RemoteAgent.jsm, even if we don't actually start to listen https://searchfox.org/mozilla-central/rev/5227b2bd674d49c0eba365a709d3fb341534f361/remote/components/RemoteAgent.jsm#53

Then when we close() RemoteAgent, we will always call this.cdp?.stop which will attempt to destroy this.targetList. However targetList is only created when you start to listen.

Note you can reproduce this by simply starting and quitting Firefox, you will get the following error logged RemoteAgent ERROR unable to stop listener: TypeError: can't access property "destructor", this.targetList is null(chrome://remote/content/cdp/CDP.jsm:92:5) JS Stack trace: [e-mail]:92:

Also note, that this is simply an error log, as we catch all exceptions in RemoteAgent.close (https://searchfox.org/mozilla-central/rev/5227b2bd674d49c0eba365a709d3fb341534f361/remote/components/RemoteAgent.jsm#144-147)

Comment 2

[Julian Descottes [:jdescottes]]

Attachment: Bug 1720070 - [remote] Only call TargetList::destructor if TargetList was created earlier

targetList might be undefined if we call CDP::stop without having called CDP::start earlier

Comment 3

[Julian Descottes [:jdescottes]]

Attachment: Bug 1720070 - [remote] Only apply common preferences on the first call to applyPreferences

Depends on D119610. After fixing the error with targetList.destructor, calling CDP::stop() without having called CDP::start() before will trigger another failure.
This is because it will trigger a late load of RecommendedPreferences which will try to automatically initialize preferences
As we discussed about moving the init to be only performed during a call to applyPreferences, I am doing this change here to avoid the error.
This will not yet allow to call this from BiDi, or it would have to call it with an empty preferences map.

Comment 4

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Given that this is not only an issue in CI for various test suites but also locally when normally exiting Firefox with the Remote Agent enabled, the priority of the bug needs to be bumped up. A fix will also have to be uplifted to beta.

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7c8b59b8c9fb
[remote] Only call TargetList::destructor if TargetList was created earlier r=webdriver-reviewers,jgraham,whimboo
https://hg.mozilla.org/integration/autoland/rev/a37ae1e32765
[remote] Only apply common preferences on the first call to applyPreferences r=webdriver-reviewers,whimboo

Comment 6

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/7c8b59b8c9fb
https://hg.mozilla.org/mozilla-central/rev/a37ae1e32765

Comment 7

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Beta checkin needs approval first because it's code living in Firefox. Julian, can you please request? Thanks.

Comment 8

[Julian Descottes [:jdescottes]]

(In reply to Henrik Skupin (:whimboo) [⌚️UTC+1] from comment #7)

Beta checkin needs approval first because it's code living in Firefox. Julian, can you please request? Thanks.

So I just retested the initial STRs, and I still get an error message for Remote Agent on shutdown. This seems solely related to loading RecommendedPreferences late. That's strange because I am quite sure this was fixed on an earlier central with the patches here. In any case, uplifting the 2 patches here will not be enough.

I prefer to reopen and quickly add a follow-up patch rather than filing a new bug. It will be easier to track for bidi-m1-mvp as well as for the uplift.

Comment 9

[Henrik Skupin [:whimboo][⌚️UTC+2]]

Note that I don't see a problem with this patch, and the failure you are seeing is a long-known issue and handled via bug 1602365. Or do you see something else?

Comment 10

[Julian Descottes [:jdescottes]]

Attachment: Bug 1720070 - [remote] Avoid calling CDP::start/stop when unnecessary

It seems that lazy loading RecommendedPreferences.jsm too late still triggers an error if invoked in CDP::stop
This doesn't relate to a specific code in RecommendedPreferences as even an empty module still triggers the problem.
Therefore it seems mandatory to ensure we don't call stop in CDP.jsm (or WebDriverBiDi.jsm, when implementation will be added there) unless start() was previously called.

Comment 11

[Julian Descottes [:jdescottes]]

(In reply to Henrik Skupin (:whimboo) [⌚️UTC+1] from comment #9)

Note that I don't see a problem with this patch, and the failure you are seeing is a long-known issue and handled via bug 1602365. Or do you see something else?

(we discussed this on Element, summarizing here for clarity)

Testing by starting Firefox with --remote-ebugging-port hides the problem since it will lead to call CDP.jsm's start() method.
The error here is logged when CDP::stop() is called without having called start() earlier, which is the case when starting Firefox without --remote-ebugging-port.

The error I see in that case is

1626348583490	RemoteAgent	ERROR	unable to stop listener: [Exception... "<no message>"  nsresult: "0x8046001e (<unknown>)"  location: "JS frame :: chrome://remote/content/cdp/CDP.jsm :: stop :: line 95"  data: no] Stack trace: stop()@CDP.jsm:95
close()@RemoteAgent.jsm:138

Comment 12

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/5cdd27feea5b
[remote] Avoid calling CDP::start/stop when unnecessary r=webdriver-reviewers,whimboo

Comment 13

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/5cdd27feea5b

Comment 14

[Julian Descottes [:jdescottes]]

Comment on attachment 9231326 [details]
Bug 1720070 - [remote] Avoid calling CDP::start/stop when unnecessary

Beta/Release Uplift Approval Request

• User impact if declined: A confusing error message is logged in stdout when quitting Firefox
• Is this code covered by automated tests?: Yes
• Has the fix been verified in Nightly?: No
• Needs manual test from QE?: Yes
• If yes, steps to reproduce: Part of the changes here are covered by automated tests, but the initial symptoms (error message in stdout) are not. It could be nice to check this with a manual test. STRs:

• start Firefox from a commandline/terminal (so that you can see the stdout output)
• quit Firefox
• check that there is no "RemoteAgent ERROR" logged

• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Minor javascript changes
• String changes made/needed:

Comment 15

[Pascal Chevrel:pascalc]

Comment on attachment 9231326 [details]
Bug 1720070 - [remote] Avoid calling CDP::start/stop when unnecessary

Low risk in early betas, approved for uplift in 91 beta 4, thanks

Comment 16

[Pascal Chevrel:pascalc]

https://hg.mozilla.org/releases/mozilla-beta/rev/bba12103259f
https://hg.mozilla.org/releases/mozilla-beta/rev/8765e1f4c98f
https://hg.mozilla.org/releases/mozilla-beta/rev/55009a7535be

Comment 17

[Catalin Sasca, Desktop Test Engineering [:csasca]]

Hey Julian, tried reproducing the issue with 91.0a1 (2021-07-12) but had no luck, the single messages I get are (###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost - on mac, ubuntu and win 10) and ([2021-07-20T06:55:26Z ERROR xulstore::persist] removeDocument error: unavailable - this appears only on macOS).

Do you have any additional info which can help in reproducing this issue ? Thank you!

Comment 18

[Henrik Skupin [:whimboo][⌚️UTC+2]]

I can verify that this works fine now and the error is no longer visible with Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:92.0) Gecko/20100101 Firefox/92.0 ID:20210719093934.

I think that's all what we had to do here for verification. So not more feedback from Julian is required.

Comment 19

[Julian Descottes [:jdescottes]]

(In reply to Catalin Sasca, QA [:csasca] from comment #17)

Hey Julian, tried reproducing the issue with 91.0a1 (2021-07-12) but had no luck, the single messages I get are (###!!! [Parent][RunMessage] Error: Channel closing: too late to send/recv, messages will be lost - on mac, ubuntu and win 10) and ([2021-07-20T06:55:26Z ERROR xulstore::persist] removeDocument error: unavailable - this appears only on macOS).

Do you have any additional info which can help in reproducing this issue ? Thank you!

Hi,

I forgot that some logs are only visible by default on non-official builds. This is because of the preference browser.dom.window.dump.enabled which is always false by default except on non-offical builds. That's why we could always see the problem on our local builds, but you could not reproduce it on a regular Nightly.

If you want to reproduce the bug, you can just flip this browser.dom.window.dump.enabled pref to true before quitting the application.

Comment 20

[Catalin Sasca, Desktop Test Engineering [:csasca]]

Thanks Julian for providing the dump pref, I was able to reproduce and verify that the issue is no longer reproducible on 91.0b4. Thanks to Henrik too for verifying on 92.0a1.