Closing because Bionic is no longer supported, feel free to re-open if
still reproducible in a supported release.
** Changed in: firefox (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1856624
Title:
Firefox freezes temporarily at 100% CPU when Chromium is opened
Status in Mozilla Firefox:
Invalid
Status in firefox package in Ubuntu:
Won't Fix
Bug description:
When Firefox is open, and I open Chromium, many features of Firefox
fail to work for several seconds. (To reproduce, start with neither
Firefox nor Chromium open; open Firefox, and allow one or more web
pages to load; then open Chromium; the issue starts a second or two
after Chromium is opened.) This is a temporary issue, lasting for
several seconds; the length of time it lasts appears to depend on how
many open tabs have been viewed since Firefox opened (on my computer,
around 10 seconds with 1 tab having been viewed, around a minute with
10 tabs having been viewed). This reproduces even when running Firefox
as `firefox -safe-mode`.
While the issue is ongoing (i.e. starting around a second after Chromium is
open, and persisting for typically tens of seconds), some features of Firefox
work, but most do not:
- Scrolling the current tab short distances succeeds, showing the expected
text on the page.
- Scrolling the current tab long distances (several screeenfuls) causes the
page to be "cut off" past a certain point, with only a blank background
rendering.
- Moving the mouse cursor over a link does not change the mouse cursor
(expected behaviour, and behaviour while the issue is not ongoing, is for it to
change to a hand shape).
- Changing tab causes the resulting page not to display: rather, a grey
background is displayed, and sometimes a loading spinner.
- Changing tab back then causes the original page not to render, as if it
were new, despite the fact it was correctly displayed earlier.
- The address bar functions as normal; the issue does not appear to affect
address bar functionality.
Additionally, while the issue is ongoing, Firefox uses 100% CPU.
At some point after the issue in question starts, it stops, and all
Firefox features return to normal (including any missing or
incorrectly rendered page content, which renders again when the issue
ends).
The trigger is specifically the act of opening Chromium: Firefox can
function just fine once the issue ends, even if Chromium is still
open, and functions just fine if Chromium is opened first.
I have an (unconfirmed) theory that opening Chromium is causing some
operation within Firefox to become very slow, using up all the CPU
time, and the other observed misbehaviours within Firefox are a
consequence of how slowly it is running; however, I've listed them all
anyway in case it provides clarity into what the specific nature of
the bug is.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: firefox 71.0+build5-0ubuntu0.18.04.1
ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-37-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ais523 1800 F.... pulseaudio
BuildID: 20191205184924
Channel: Unavailable
CurrentDesktop: X-Cinnamon
Date: Tue Dec 17 00:29:10 2019
ExecutablePath: /usr/lib/firefox/firefox
ForcedLayersAccel: False
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
IncompatibleExtensions:
English (South Africa) Language Pack - [email protected]
Français Language Pack - [email protected]
English (GB) Language Pack - [email protected]
Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2019-11-11 (35 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64
(20190805)
IpRoute:
default via 192.168.1.1 dev wlp2s0 proto dhcp metric 600
169.254.0.0/16 dev wlp2s0 scope link metric 1000
192.168.1.0/24 dev wlp2s0 proto kernel scope link src 192.168.1.101 metric
600
MostRecentCrashID: bp-935fd166-3720-454f-8fe5-0a1752140227
PrefErrors: Unexpected character ',' before close parenthesis @
/usr/lib/firefox/omni.ja:greprefs.js:722
PrefSources: prefs.js
ProcEnviron:
LANGUAGE=en_GB:en
PATH=(custom, user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=71.0/20191205184924 (In use)
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/30/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.5.1
dmi.board.name: 0DDKKC
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.5.1:bd05/30/2019:svnDellInc.:pnInspiron3583:pvr:rvnDellInc.:rn0DDKKC:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 3583
dmi.product.sku: 08CA
dmi.sys.vendor: Dell Inc.
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