1552655 - Firefox gets sometimes 100% of CPU on my Dell PC

Status: RESOLVED INCOMPLETE

(Core :: General, defect, P3)

Description

[Marco Sulla]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

I use Firefox with my home PC, a Lenovo B590, and with my PC at work, a DELL Latitude 5480.

I use for both the same OS, Lubuntu 18.04.2, and the same Firefox prefs and extensions, since I have Sync enabled. The home pc is always on, the work computer is put under hibernation at work's end.

Actual results:

Sometimes the Firefox at work gets 100% of CPU. If I try to close it with CNTRL+Q, it does not stop. I have to do killall firefox on bash.
This never happened at my home PC, and I must say sometimes I run though VPN the work projects, and sometimes I worked at home through the VPN. So the home PC had the same tabs opened of the work PC, and even more.

Expected results:

I expect to not have a 100% CPU load. How can I debug it when it happens?

Comment 1

[Liviu Seplecan]

Hi @Marco Sulla, what could be done here is to capture a performance profile: access please this link: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem
If the problem couldn't be solved with this after this performance profile, some extra data is needed about the VPN connection; if you're using a router(with the LAN rules and this is overburdened) -> then you can get this high CPU range. So, the problem could be the VPN log.
Furhter, I will set a component to the issue and we ask Mike Coley to give us a hand interpreting the results of your performance profile.
Thanks for your contribution.

Comment 2

[Liviu Seplecan]

Hi @Mike Conley, could you please give us a hand with this issue? Thanks

Comment 3

[Mike Conley (:mconley) (:⚙️)]

Until there's a performance profile (as requested in comment 1), there's really not much I can help with. Feel free to needinfo me again when a profile is made available, and I'll happily analyze it.

Comment 4

[Marco Sulla]

(In reply to Liviu Seplecan from comment #1)

some extra data is needed about the VPN connection; if you're using a router(with the LAN rules and this is overburdened) -> then you can get this high CPU range.

I used the VPN with my home PC, that have no problem.

(In reply to Liviu Seplecan from comment #1)

Hi @Marco Sulla, what could be done here is to capture a performance profile: access please this link: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Reporting_a_Performance_Problem

Ok, I install the extension and the next time it happens, I'll give you the data. But must I use absolutely the Nightly build? I have the latest version of Firefox stable. Furthermore I use it at work, I need a stable version with my extensions (as Fake Data), bookmarks, saved logins, form and url history and personalizations.

Comment 5

[Marco Sulla]

PS: there's some particular settings I have to activate/disactivate for my case, or I leave the default settings of Gecko Profiler?

Comment 6

[Marco Sulla]

Excuse me..

Comment 7

[Mike Conley (:mconley) (:⚙️)]

A Nightly instance of the browser will reveal more, but you can try using it with your current version of Firefox and we'll see if there's anything useful we can derive out of it.

Comment 8

[Marco Sulla]

I had to remove the extension. It caused me an extreme slowdown of the entire application. Is there not another way to debug the problem?

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

A needinfo is requested from the reporter, however, the reporter is inactive on Bugzilla. Closing the bug as incomplete.

For more information, please visit BugBot documentation.