Last Comment Bug 646157 - Stops responding when selecting a checkbox on the Netapp admin page inside deeply nested <label>s
: Stops responding when selecting a checkbox on the Netapp admin page inside de...
: dev-doc-complete, hang, testcase
Product: Core
Classification: Components
Component: DOM (show other bugs)
: Trunk
: All All
: -- normal with 1 vote (vote)
: mozilla8
Assigned To: Kyle Huey [:khuey] (
: 579352 667005 668534 (view as bug list)
Depends on: 673859
  Show dependency treegraph
Reported: 2011-03-29 11:53 PDT by jason
Modified: 2011-12-28 09:31 PST (History)
16 users (show)
khuey: in‑testsuite+
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

Mini Dumpfile from Firefox (1.69 MB, application/octet-stream)
2011-03-29 12:01 PDT, jason
no flags Details
Stack Dump (159.98 KB, text/plain)
2011-03-30 10:23 PDT, jason
no flags Details
html causing problems (35.11 KB, text/html)
2011-03-30 11:28 PDT, jason
no flags Details
Patch v1 (3.43 KB, patch)
2011-04-07 13:31 PDT, Mounir Lamouri (:mounir)
bugs: review-
Details | Diff | Splinter Review
testcase (1.01 KB, text/html)
2011-04-07 13:36 PDT, Mounir Lamouri (:mounir)
no flags Details
testcase2 (1.07 KB, text/html)
2011-04-19 06:50 PDT, Olli Pettay [:smaug]
no flags Details
First half (10.86 KB, patch)
2011-07-18 16:45 PDT, Kyle Huey [:khuey] (
bugs: review+
Details | Diff | Splinter Review
Second half (6.77 KB, patch)
2011-07-18 17:16 PDT, Kyle Huey [:khuey] (
bugs: review+
Details | Diff | Splinter Review

Description jason 2011-03-29 11:53:37 PDT
User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0

It seems when selecting checkboxes on the Netapp Admin pages, seems to cause Firefox 4 to go into an infinity loop, where it refuses to respond.  This also occurs in Safemode, and in a new profile in Safe Mode.

In Process Explorer, it seems to run the CPU to 100% (of at least 1 processor), and the memory will climb for a few minutes upto around 300Mb then it will drop by around 100Mb and this will repeat.

Reproducible: Always

Steps to Reproduce:
1. Load Page to Manage Quotas
2. Click on Checkbox
3. Wait for a long time, it doesn't seem to crash or anything.
Actual Results:  
Locks up Firefox

Expected Results:  
It should check the box

I don't think there is anything at the moment.  Though limits the usefulness
Comment 1 jason 2011-03-29 12:01:05 PDT
Created attachment 522757 [details]
Mini Dumpfile from Firefox
Comment 2 jason 2011-03-29 12:03:13 PDT
I have also seen this in the netapp communities as well
Comment 3 Matthias Versen [:Matti] 2011-03-29 14:46:38 PDT
Please create a stack trace with Windbg
Comment 4 XtC4UaLL [:xtc4uall] 2011-03-30 08:58:28 PDT
Does it work in Fx 3.6? Does it work in one of the past Fx4 Betas?
Comment 5 jason 2011-03-30 09:47:46 PDT
it did work in 3.6, but I never tried in the Betas if I recall, as I had not required to manage the device in question, while I was using the Betas
Comment 6 jason 2011-03-30 10:23:26 PDT
Created attachment 523045 [details]
Stack Dump
Comment 7 Matthias Versen [:Matti] 2011-03-30 10:54:15 PDT
This seems to be the loop:

This will be still difficult without a testcase and I'm really lost if it comes to select a component for this. Can you help here Boris ?
Comment 8 Boris Zbarsky [:bz] 2011-03-30 11:02:10 PDT
CCing some more folks.

The description doesn't sound like infinite recursion (e.g. no crash).  So what's really going on?

Reporter, are you able to attach the relevant HTML to this bug?
Comment 9 jason 2011-03-30 11:05:39 PDT
possibly but it does have to get sanitized heavily, since it deals with production stuff.   You may be able to contact netapp, and ask for their Simulator.
Comment 10 Boris Zbarsky [:bz] 2011-03-30 11:13:06 PDT
jason, is the concern about making the HTML completely public, or about anyone at all being able to see it?

That is, are you happier sending the HTML to me by private mail, with the promise that I would not be posting it anywhere?

Chris, do we have contacts at netapp?
Comment 11 jason 2011-03-30 11:15:46 PDT
it seems that there are a large number of 
<label for="vol-1" /><input name="vol-13" type="hidden" value="V00067" title="vol-13" id="vol-1" />

type lines, at 10 it is very slow, at 20 it stops responding.
Comment 12 jason 2011-03-30 11:28:23 PDT
Created attachment 523068 [details]
html causing problems

it has been slightly santized.
Comment 13 jason 2011-03-30 11:30:08 PDT
Comment on attachment 523068 [details]
html causing problems

Even locally this still causes problems, and with javascript disabled as well.
Comment 14 jason 2011-03-30 11:47:47 PDT
At 20 <label> tags, it stops responding while it's processing, and takes around 5 minutes or more to start responding.

Doing some tests, it looks like the following
13 - 3 seconds
14 - 6 seconds
16 - 10 seconds or so
Comment 15 Boris Zbarsky [:bz] 2011-03-30 12:18:49 PDT
Ah, so tons of nested labels, and then you click something inside the innermost one.  I see.

In firefox 3.6 the labels do NOT nest.
Comment 16 Boris Zbarsky [:bz] 2011-03-30 12:20:47 PDT
They do nest in Opera and Webkit, though.

Are we ending up with something silly like activating labels exponentially many times in the depth of nesting?
Comment 17 Boris Zbarsky [:bz] 2011-03-30 12:21:11 PDT
Oh,!DOCTYPE%20html%3E%0A%3Clabel%2F%3E%0A%3Clabel%2F%3E for the testcase for parser behavior.
Comment 18 jason 2011-03-30 12:28:55 PDT
Actually even clicking on the first item in the list triggers this.
Comment 19 Mounir Lamouri (:mounir) 2011-04-07 13:31:02 PDT
Created attachment 524468 [details] [diff] [review]
Patch v1

Actually, label elements ignore click events coming from their descendants but the code doing that go from the target of the event to the label but doesn't check siblings, only parents.

The behavior we have with this patch seems to be the same on Opera. I do not have any webkit browser on this laptop.
Comment 20 Mounir Lamouri (:mounir) 2011-04-07 13:36:45 PDT
Created attachment 524470 [details]

If someone can give me the results when clicking on the rightest label (with various browsers): it should be 1/6.
Comment 21 Boris Zbarsky [:bz] 2011-04-07 14:10:26 PDT
It's 1/6 in Safari, Chrome, and Opera over here.
Comment 22 Mounir Lamouri (:mounir) 2011-04-07 14:52:25 PDT
Nice! Thanks for checking :)
Comment 23 Olli Pettay [:smaug] 2011-04-18 07:45:02 PDT
Comment on attachment 524468 [details] [diff] [review]
Patch v1

I don't understand why you check only previoussibling and not nextsibling.
Comment 24 Mounir Lamouri (:mounir) 2011-04-18 08:07:53 PDT
(In reply to comment #23)
> Comment on attachment 524468 [details] [diff] [review]
> Patch v1
> I don't understand why you check only previoussibling and not nextsibling.

This code tries to prevent sending a click event to the control element if it has been sent to it already. AFAIK, this can't happen if the element is after the target element in tree order. IOW, the method reproduces how the event bubbles and make sure that the control element isn't in the bubbling path.
Comment 25 Olli Pettay [:smaug] 2011-04-19 06:50:55 PDT
Created attachment 526976 [details]

With or without the patch our behavior when clicking the last checkbox is different than on Opera or Chromium
Comment 26 Olli Pettay [:smaug] 2011-04-19 06:57:13 PDT
Though, actually, I didn't check that Opera or Chromium parse the testcase
the same way as gecko.
Comment 27 Luis 2011-05-06 00:22:02 PDT
Setting "html5.parse.enable" to false seems to solve the problem. See bug 579352.
Comment 28 Henri Sivonen (:hsivonen) (Not doing reviews or reading bugmail until 2016-08-01) 2011-05-15 06:32:43 PDT
*** Bug 579352 has been marked as a duplicate of this bug. ***
Comment 29 jason 2011-06-17 07:46:27 PDT
is there any update for when this patch will be included?
Comment 30 Matthias Versen [:Matti] 2011-06-17 11:01:43 PDT
The patch got a negative review and it will be not included in any Firefox release. When the next patch gets a positive review it will get checked into the trunk and that's currently FF7.
Comment 31 Boris Zbarsky [:bz] 2011-06-27 13:04:07 PDT
*** Bug 667005 has been marked as a duplicate of this bug. ***
Comment 32 Kyle Huey [:khuey] ( 2011-06-27 13:08:09 PDT
Mounir, what is the status here?
Comment 33 Boris Zbarsky [:bz] 2011-06-30 10:49:07 PDT
*** Bug 668534 has been marked as a duplicate of this bug. ***
Comment 34 Kyle Huey [:khuey] ( 2011-07-12 17:36:38 PDT
I investigated this a bit.  The behaviors in various browsers are:

 Engine |  A bubbling click can trigger  |  A label-generated click can
        |  multiple <labels>             |  trigger additional labels
 Gecko  |           Yes                  |              Yes
 Webkit |                                |
 / IE   |           No                   |              No
 Opera  |           No                   |              Yes

Note that Opera and Webkit agree on Mounir's testcase if you click on the checkbox, but disagree if you click on the text, because of their differences here.
Comment 35 Kyle Huey [:khuey] ( 2011-07-12 18:00:48 PDT
In fact, no other browser propagates a click event beyond the first label it encounters.
Comment 36 Kyle Huey [:khuey] ( 2011-07-18 09:44:07 PDT
So the spec doesn't really say what to do here.

"The label element's exact default presentation and behavior, in particular what its activation behavior might be, if anything, should match the platform's label behavior."

As far as I know, platforms don't really have the concept of "bubbling" events ...
Comment 37 Kyle Huey [:khuey] ( 2011-07-18 10:42:16 PDT
Olli says we should copy the WebKit/IE behavior here.
Comment 38 Kyle Huey [:khuey] ( 2011-07-18 14:36:51 PDT
(In reply to comment #37)
> Olli says we should copy the WebKit/IE behavior here.

except that we're going to let the original click continue to bubble.
Comment 39 Kyle Huey [:khuey] ( 2011-07-18 16:45:33 PDT
Created attachment 546668 [details] [diff] [review]
First half

This is the first half.  This patch stops a bubbling click from triggering multiple <label>s.  This is enough to fix the hang.
Comment 40 Kyle Huey [:khuey] ( 2011-07-18 17:16:01 PDT
Created attachment 546683 [details] [diff] [review]
Second half

Propagate the "I've trigger a label" flag to the synthetic click event.

I'm going to throw this whole thing at try to see if anything depends on our existing behavior.
Comment 41 Kyle Huey [:khuey] ( 2011-07-18 17:35:01 PDT
After applying these two patches we should behave like WebKit and IE except that we will allow the original click event to continue to bubble.
Comment 42 Mozilla RelEng Bot 2011-07-18 22:41:00 PDT
Try run for e094d7112f16 is complete.
Detailed breakdown of the results available here:
    success: 146
    warnings: 15
    failure: 2
Total buildrequests: 163
Comment 43 Kyle Huey [:khuey] ( 2011-07-22 06:58:24 PDT

The behaviors that I describe in the commit message are worth documenting on MDC, I think.
Comment 44 Jake Maul [:jakem] 2011-07-22 11:47:54 PDT
Pressing my luck here, but any chance this could land in Aurora (Fx7) as well? :)
Comment 45 Kyle Huey [:khuey] ( 2011-07-25 13:54:43 PDT
(In reply to comment #44)
> Pressing my luck here, but any chance this could land in Aurora (Fx7) as
> well? :)

Don't think so, sorry :-(
Comment 46 Kyle Huey [:khuey] ( 2011-07-25 13:55:55 PDT
If you wanted to verify that this is fixed on Nightlies, that would be awesome :-)
Comment 47 Jake Maul [:jakem] 2011-07-25 15:16:48 PDT
The NetApp FilerView hang is indeed fixed in the 7/25 nightly build. :) :) :)
Comment 48 Shyam Mani [:fox2mike] 2011-07-25 16:59:53 PDT

Just a note of thanks from both myself and Jake, for working on this, pushing this to the right component and getting it looked at, testing, working on patches etc.

Thanks again!

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