Bug 2216932

Summary:	Firefox gets into a status where all keystrokes are delayed by 20+ seconds in all windows
Product:	[Fedora] Fedora	Reporter:	Albert Flügel <af>
Component:	firefox	Assignee:	Gecko Maintainer <gecko-bugs-nobody>
Status:	CLOSED WORKSFORME	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	38	CC:	erack, gecko-bugs-nobody, jhorak, klaas, rstrode, stransky
Target Milestone:	---	Keywords:	Desktop, Regression, Upgrades
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-07-18 08:29:44 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Albert Flügel 2023-06-23 09:56:26 UTC

When i use firefox, after a while, any key typing (not mouse moving or clicking) gets delayed by 20 seconds or more. No other running program is affected meanwhile (e.g. thunderbird, shell window). The issue can only be fixed by restarting firefox

Reproducible: Always

Steps to Reproduce:
1. start firefox
2. use it for some time, usually longer than 10 minutes

Actual Results:  
For typing, firefox is hardly usable anymore e.g. while reporting a bug in this bugzilla

Expected Results:  
firefox remains usable

firefox-114.0.2-1.fc38.x86_64

Comment 1 Albert Flügel 2023-06-23 09:58:13 UTC

Additional info: firefox' CPU utilization looks normal while the problem is visible. So it should not be busy i guess. Pasting text with the middle mouse button works normally as well. Just typing does not.

Comment 2 Martin Stransky 2023-06-26 08:59:51 UTC

Can you please run on terminal with MOZ_LOG="Widget:5" env variable like:

MOZ_LOG="Widget:5" firefox 2>&1 | grep Key

and check if key events are logged in time or are delayed?
Thanks.

Comment 3 Albert Flügel 2023-07-07 13:41:29 UTC

Cannot reproduce it currently. I have wrapped the firefox program, so i always get key events logged, when firefox is started.
Please feel free to close this issue for now. When it comes back, i'll reopen.

Comment 4 Martin Stransky 2023-07-18 08:29:44 UTC

Okay, Thanks.

Comment 5 Albert Flügel 2023-09-09 13:26:16 UTC

Recently i had seen that again, but due to whatever changes in updates of Fedora my wrapper was not active anymore, so i don't have any captured typing.

Instead, i have observed this absurd phenomenon on thunderbird as well. Assuming, the code base is to some degree common, i have wrapped thunderbird the same way. Can anyone confirm, that the environment setting MOZ_LOG="Widget:5" is effective with thunderbird, too ?

Comment 6 Martin Stransky 2023-09-11 09:06:50 UTC

(In reply to Albert Flügel from comment #5)
> Recently i had seen that again, but due to whatever changes in updates of
> Fedora my wrapper was not active anymore, so i don't have any captured
> typing.
> 
> Instead, i have observed this absurd phenomenon on thunderbird as well.
> Assuming, the code base is to some degree common, i have wrapped thunderbird
> the same way. Can anyone confirm, that the environment setting
> MOZ_LOG="Widget:5" is effective with thunderbird, too ?

Yes, it's the same codebase. Please check if the delay is on TB side.
Thanks.