User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:13.0) Gecko/20100101 Firefox/13.0.1 Build ID: 20120615040358 Steps to reproduce: Start up Firefox, even in safe-mode Actual results: Already immediately from the start, CPU consumption jumped at over 50%. If I actually do stuff, it goes over 100% Expected results: An idle Firefox, with no tabs should consume next to nothing. And even with Facebook open, it definitely should consume less than 5% on this 2600 Mhz AMD CPU. Opera can do it, why not firefox?
Oddly enough, after restarting my whole system, firefox is fast again. Just restarting only firefox was not enough to achieve this. Weird.
I got the same behavior. Only reboot helped. Matti thinks related to the kernel leap second issue, which would explain the need to reboot.
Status: UNCONFIRMED → NEW
Ever confirmed: true
We had a leap second from June 30 to July 1 ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.43 That the lap second could be responsible for this is really just a guess from my side. The guess is based on articles like this http://pedroalves-bi.blogspot.de/2012/07/java-leap-second-bug-how-to-fix-your.html and 2 unique reports from Firefox linux users. Reproducing and fixing this could be impossible due to rare occurrence of leap seconds.
Component: Untriaged → General
Product: Firefox → Core
QA Contact: untriaged → general
Summary: Firefox 13.0.1. consumes huge amounts of CPU → Firefox 13.0.1. consumes huge amounts of CPU (due to leap second ?)
This seems to be a bug in the kernel: http://thread.gmane.org/gmane.linux.kernel/1321255/
(In reply to Matthias Versen (Matti) from comment #4) > This seems to be a bug in the kernel: > http://thread.gmane.org/gmane.linux.kernel/1321255/ so not solvable by Firefox?
Should be solved by bug fixes ion the kernel. Mozilla wasn't the only software affected by this bug
Status: NEW → RESOLVED
Last Resolved: 6 years ago
Resolution: --- → INVALID
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