Central as Beta simulation:https://treeherder.mozilla.org/#/jobs?repo=try&revision=97f33898085bd142cde60eb97907e461f59a8d9a&selectedJob=234804995

Failure log: https://treeherder.mozilla.org/logviewer.html#?job_id=234804995&repo=try

3819 15:44:36 INFO - TEST-UNEXPECTED-FAIL | browser/components/urlbar/tests/browser/browser_UrlbarInput_tooltip.js | Test timed out -
4010 15:44:56 INFO - TEST-UNEXPECTED-FAIL | browser/components/urlbar/tests/browser/browser_UrlbarInput_tooltip.js | Uncaught exception received from previously timed out test - at chrome://mochitests/content/browser/browser/components/urlbar/tests/browser/browser_UrlbarInput_tooltip.js:7 - TypeError: BrowserTestUtils is null
6222 15:56:46 ERROR - Return code: 1
6223 15:56:46 ERROR - Got 2 unexpected statuses

Might be related to bug 1536069.

Daniel, can you confirm this only seems to affect Firefox built in DevEdition on Linux? I think I'm reading the results right...

Hi Mark, It seems so. Do you want me to run it on all platforms?

sigh

I'm seeing if I can get at least some more info on what's happening here.

Initial results from try are that this is hanging on the initial await synthesizeMouseOut(gURLBar.inputField); - so the mouseout isn't always generating an event.

I'm wondering if in this case the mouse isn't always over the input field, so it won't generate that event... though I'd have expected that to cause more issues.

I'll think more about the options in the morning.

Daniel, please could you give the attached patch a run with the central as beta simulation?

It works for me on my Linux setup, so I'd like to see how it works there as well.

Mark, this is the run: https://treeherder.mozilla.org/#/jobs?repo=try&revision=a9ca30bbf464631b45bf0f45d251f8f35c2f86d2&selectedJob=238828416

Thanks, that looks good. Here's a try push for latest master with test-verify on as well:

https://treeherder.mozilla.org/#/jobs?repo=try&revision=c0f39bc30dcd47259e7f59d01b5489019e5eaab0

https://hg.mozilla.org/mozilla-central/rev/6efaae3bcd67

This issue got observed once today in beta simulations on Linux32 shippable: https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel%2Crunnable&revision=01e5e0117ed0144266135ae84ea07bc0322aef07&selectedJob=239108329

(In reply to Sebastian Hengst [:aryx] (needinfo on intermittent or backout) from comment #15)

This issue got observed once today in beta simulations on Linux32 shippable: https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel%2Crunnable&revision=01e5e0117ed0144266135ae84ea07bc0322aef07&selectedJob=239108329

That's a non-devedition build, so we might still have issues with it being occasionally intermittent.

Mark, this is not intermittently failing, this is still perma-failing:

https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=c8d5ba6a676bbe975c184717a68e5ccdd6e558b7&selectedJob=239350893

(In reply to Andreea Pavel [:apavel] from comment #17)

Mark, this is not intermittently failing, this is still perma-failing:

https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=c8d5ba6a676bbe975c184717a68e5ccdd6e558b7&selectedJob=239350893

That looks different as this bug was happening on DevEdition only. This bug was also verified before pushing in comment 11.

Could you try it again with bug 1540861 backed out, and then file a new bug please?

(In reply to Mark Banner (:standard8) from comment #18)

(In reply to Andreea Pavel [:apavel] from comment #17)

Mark, this is not intermittently failing, this is still perma-failing:

https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=c8d5ba6a676bbe975c184717a68e5ccdd6e558b7&selectedJob=239350893

That looks different as this bug was happening on DevEdition only. This bug was also verified before pushing in comment 11.

Could you try it again with bug 1540861 backed out, and then file a new bug please?

yes Mark, we'll do that. thank you.

I actually pushed bug 1540861 with beta simulation patch and it didn't fail https://treeherder.mozilla.org/#/jobs?repo=try&revision=06f17c72e146ed3d16ffaa764d29fb6c8cd57325

I suspect you may have run the simulation while the first version of bug 1540861 was in the tree, that version was indeed permanently failing on linux x64 shippable.
I'd suggest to try with current mozilla-central first.

Not observed with today's beta simulations: https://treeherder.mozilla.org/#/jobs?repo=try&resultStatus=pending%2Crunning%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&revision=1759078ce933515cd0c6bcb8f40d855c4ccd92b8&searchStr=browser-chrome&selectedJob=239909878