1176643 - Computer restarts when going to Defcon website

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[stephwag]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36

Steps to reproduce:

Used Firefox 38.0.5 on Mac

1) Go to https://www.defcon.org/
2) Open console app
3) Notice that there are periods of freezing and problems rending the site.
4) Refresh the page or click a link until crash happens (if it didn't crash from just going to the site initially)


Actual results:

Various error messages, then finally computer crashed.

Error message after the crash:
6/21/15 5:50:16.000 PM kernel[0]: process firefox[6152] caught causing excessive wakeups. Observed wakeups rate (per sec): 1622; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 51045

This error message also seems to show up when it's having problems rending the site:
6/21/15 5:50:17.201 PM firefox[6152]: AVF warning: PPDithering unsupported pixel type, ditherEnable:1, destination 420f



Expected results:

Site renders fine, Firefox is fine, and computer doesn't restart.

Comment 1

[:Gijs (he/him)]

(In reply to stephwag from comment #0)
> 3) Notice that there are periods of freezing and problems rending the site.

Can you elaborate on "problems rendering the site" ?

> 6/21/15 5:50:16.000 PM kernel[0]: process firefox[6152] caught causing
> excessive wakeups. Observed wakeups rate (per sec): 1622; Maximum permitted
> wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime
> number of wakeups: 51045
> 
> This error message also seems to show up when it's having problems rending
> the site:
> 6/21/15 5:50:17.201 PM firefox[6152]: AVF warning: PPDithering unsupported
> pixel type, ditherEnable:1, destination 420f

Markus, do you know anything about this and/or do you know who would?

Comment 2

[Markus Stange [:mstange]]

I don't know what the cause of the wakeups is. Somebody will have to figure this out as part of the power usage reduction effort.
The other error message looks like something related to video decoding.

Comment 3

[jmmyjhn007]

I'd like to second this, and I can submit any log files requested, though I'm not sure where to do so where they won't be publicly displayed.  I've experienced a crash and machine shutdown after visiting the DefCon 23 website specifically.  Sometimes the page will display without any of the CSS elements or images rendering (IE plain text).  Sometimes the banner will render, but not correctly.  Pieces of previous images will appear (past page images), along with what is supposed to be rendered, and it will all appear in a weird scrambled grid (think about squares on a chess board being mixed up).  Other times the page may not load at all, and it will crash the machine.  

I'm running OSX 10.10.4, with Firefox 39.0.  Not to be overly paranoid, but this seems a little concerning.  I'd love to have someone say this isn't an issue, or look into it, but if rendering a page has the potential to shutdown a machine, this seems like it could be a potentially big security issue.

Comment 4

[:Gijs (he/him)]

(In reply to jmmyjhn007 from comment #3)
> I'd like to second this, and I can submit any log files requested, though
> I'm not sure where to do so where they won't be publicly displayed.  I've
> experienced a crash and machine shutdown after visiting the DefCon 23
> website specifically.  Sometimes the page will display without any of the
> CSS elements or images rendering (IE plain text).  Sometimes the banner will
> render, but not correctly.  Pieces of previous images will appear (past page
> images), along with what is supposed to be rendered, and it will all appear
> in a weird scrambled grid (think about squares on a chess board being mixed
> up).  Other times the page may not load at all, and it will crash the
> machine.  
> 
> I'm running OSX 10.10.4, with Firefox 39.0.  Not to be overly paranoid, but
> this seems a little concerning.  I'd love to have someone say this isn't an
> issue, or look into it, but if rendering a page has the potential to
> shutdown a machine, this seems like it could be a potentially big security
> issue.

Can you reproduce these issues in Firefox's safe mode? (help > restart with add-ons disabled --- it does a bit more than what it says on the tin...)

Comment 5

[:Gijs (he/him)]

(In reply to :Gijs Kruitbosch from comment #4)
> (In reply to jmmyjhn007 from comment #3)
> > I'd like to second this, and I can submit any log files requested, though
> > I'm not sure where to do so where they won't be publicly displayed.  I've
> > experienced a crash and machine shutdown after visiting the DefCon 23
> > website specifically.  Sometimes the page will display without any of the
> > CSS elements or images rendering (IE plain text).  Sometimes the banner will
> > render, but not correctly.  Pieces of previous images will appear (past page
> > images), along with what is supposed to be rendered, and it will all appear
> > in a weird scrambled grid (think about squares on a chess board being mixed
> > up).  Other times the page may not load at all, and it will crash the
> > machine.  
> > 
> > I'm running OSX 10.10.4, with Firefox 39.0.  Not to be overly paranoid, but
> > this seems a little concerning.  I'd love to have someone say this isn't an
> > issue, or look into it, but if rendering a page has the potential to
> > shutdown a machine, this seems like it could be a potentially big security
> > issue.
> 
> Can you reproduce these issues in Firefox's safe mode? (help > restart with
> add-ons disabled --- it does a bit more than what it says on the tin...)

Comment 6

[Yury Delendik (:yury)]

> Can you reproduce these issues in Firefox's safe mode? (help > restart with
> add-ons disabled --- it does a bit more than what it says on the tin...)

Yes, even in safe mode, going to https://defcon.org might hangs the entire machine or ff fails with the system crash dialog box.

Comment 7

[jmmyjhn007]

I do want to mention that after discovering this issue, I reported it to the site admins.  For me at least, the site appeared function the next day and I was not able to reproduce the issue on OSX 10.10.x with Firefox 39.x, however I haven't tried recently.  And for me, it was only the DEFCON 23 site specifically that cause the issue, not the main site.  The machine I used to test this issue has since been reloaded, but most of the logs (perhaps all of the relevant logs) were preserved.  If any of that information would be useful, let me know.

Comment 8

[Liviu Cirdei]

User Agent 	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:47.0) Gecko/20100101 Firefox/47.0
Build ID 	20160126030244

Hi, 

Is this issue still reproducible on your side on latest Firefox builds? e.g.Firefox 43  Nightly 47. 
I tried on both and no crash happened on https://www.defcon.org/ .

Comment 9

[Liviu Cirdei]

Marking this as Resolved: Incomplete due to the lack of response from the reporter.
If anyone can still reproduce it on latest versions, feel free to reopen the issue and provide more information.