Last Comment Bug 718340 - Don't traverse black windows
: Don't traverse black windows
Product: Core
Classification: Components
Component: DOM (show other bugs)
: 12 Branch
: All All
: -- normal (vote)
: ---
Assigned To: Olli Pettay [:smaug]
: Andrew Overholt [:overholt]
Depends on:
Blocks: 716598
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Reported: 2012-01-15 14:52 PST by Olli Pettay [:smaug]
Modified: 2012-01-17 23:30 PST (History)
5 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

patch (999 bytes, patch)
2012-01-15 14:52 PST, Olli Pettay [:smaug]
continuation: review+
jst: review+
Details | Diff | Splinter Review

Description Olli Pettay [:smaug] 2012-01-15 14:52:50 PST
Created attachment 588779 [details] [diff] [review]

There are cases when window is still black, but document isn't in CC generation.

I think this would be the fix for jst's Google Reader problem.

I'd like to land this small patch separately so that possible regressions are easier
to find.
Comment 1 Olli Pettay [:smaug] 2012-01-15 14:57:09 PST
The patch has been part of my bigger patch for ~two weeks now, and so far everything looks ok.
Comment 2 Andrew McCreight [:mccr8] 2012-01-15 16:04:27 PST
Comment on attachment 588779 [details] [diff] [review]

Makes sense.  The wrapper will always keep the window alive, so this makes sense to me.  Just out of curiousity, have you looked at doing this for nsGenericElements with wrappers?
Comment 3 Olli Pettay [:smaug] 2012-01-15 16:10:45 PST
Yes, nodes do check blackness already. It is just that any changes to window's CC handling *may*
have more dramatic effects than changing just node/element/document handling - that is why
I want to land this small patch separately.
Comment 4 Olli Pettay [:smaug] 2012-01-16 03:14:02 PST
Comment 5 Olli Pettay [:smaug] 2012-01-16 08:34:10 PST
Some unknown orange. filed bug 716598
Comment 6 Olli Pettay [:smaug] 2012-01-16 08:34:54 PST
(In reply to Olli Pettay [:smaug] from comment #5)
> Some unknown orange. filed bug 716598
er, bug 718411
Comment 7 Olli Pettay [:smaug] 2012-01-16 08:39:15 PST
I haven't seen the error on tryserver. Is it required to traverse timeouts even when
the window is black. But if so, why not when the document is in cc generation.
Comment 8 Olli Pettay [:smaug] 2012-01-16 12:14:39 PST
I don't understand it. Timeouts should be traversed anyway, since they are stored in mJSHolders
and XPConnect should add that stuff to CC.
Comment 9 Andrew McCreight [:mccr8] 2012-01-16 12:49:43 PST
Have you tried turning on CC logging and seeing what they look like with and without this turned optimization?
Comment 10 Olli Pettay [:smaug] 2012-01-16 12:56:28 PST
Well, there is certainly a bug in videocontrols.xml.

But no, I haven't checked the CC logs, since I can't reproduce the problem.
Comment 11 Olli Pettay [:smaug] 2012-01-16 14:17:06 PST
And looks like the failure isn't caused by this. It happened even after backout.
Comment 12 Andrew McCreight [:mccr8] 2012-01-16 14:37:42 PST
Well, at least that means we still probably understand what is happening.
Comment 13 Olli Pettay [:smaug] 2012-01-17 02:50:39 PST

The problem ended up being a regression from another patch which landed just before this one.

Hopefully better luck this time.

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