1089842 - Firefox is refusing to close and takes a lot of CPU until I kill the process.

Status: RESOLVED WORKSFORME

(Firefox :: Untriaged, defect)

Description

[Allard]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:33.0) Gecko/20100101 Firefox/33.0
Build ID: 20141013200257

Steps to reproduce:

I watched a couple of video's on YouTube with the HTML5 player on.


Actual results:

For some reason the browser wouldn't load anymore video's and I had to quit Firefox. I soon discovered that Firefox still was running in the background and taking a lot of CPU, probably max. 70%.

As I can tell, this only happens to me when I play random video's on YouTube, It's not always happens tough.


Expected results:

The browser should have been closed when I clicked the quit button.

Comment 1

[Nickolay_Ponomarev]

Thanks for the report.

Some thing you could try to narrow down the problem:
1) Test in a clean profile https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
2) Make sure you disabled all plugins in the new profile (such as flash and java)
3) Disable hardware acceleration https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#w_turn-off-hardware-acceleration
4) Test with the latest development version (still using the test profile): http://nightly.mozilla.org/
5) If the problem still persists, obtaining the debugging symbols <https://developer.mozilla.org/en/docs/Using_the_Mozilla_symbol_server#Downloading_symbols_on_Linux_Mac_OS_X> and trying to figure out what's happening during shutdown with gdb might be the way to figure this out.

Comment 2

[Allard]

Ok I'm a little bit further now. Seems like it really is something with HTML5 because Flash works absolutely fine on YouTube. As soon as I enable the HTML5 player in YouTube the problem seems to be back. However it doesn't always happens and it worked fine until Firefox 33 came out.

A new profile doesn't work, I tried that several times. I also disabled all my plugins and that doesn't solve the problem as well. I haven't tried to disable hardware acceleration yet, so I will leave that as last.

Comment 3

[Rubén]

I'm experiencing more or less the same issue with Firefox 36.0.1 on Xubuntu 14.10 x86_64 after visiting certain websites (phoronix.com is one of the triggers) the CPU usage will go op to 12% and remain at that level constantly. 
Closing Firefox the normal way doesn't kill the process, it will remain active and consume 12% of CPU resources, i have to manually kill the process to completely shutdown Firefox.

Comment 4

[Nickolay_Ponomarev]

Turns out we have a simpler way to get a stack trace from hung Firefox on Linux: https://developer.mozilla.org/en-US/docs/How_to_Report_a_Hung_Firefox

I don't know of a way to get troubleshooting info about videos, so this seems like the best chance to get additional information that might shed some light on the source of the problem.

Comment 5

[Allard]

Strange, as today in Firefox 36 and foreword this doesn't seem to be happening anymore.

Comment 6

[YF (Yang)]

Based on comment 5. REOPEN this bug if it happened again.