1130394 - Firefox hangs when loading a page with flash content

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Plug-ins, defect)

Description

[Bogdan Maris, Desktop QA]

Affected OS`s:
- Ubuntu 14.04 64-bit

Affected builds:
- Firefox 36 beta 7 to 36 beta 1 (Firefox 35.0.1 not affected)

STR:
1. Open Firefox
2. Load a flash content, any Youtube video would do. (eg: https://www.youtube.com/watch?v=LtOGa5M8AuU)
3. Scroll a bit on the page.

Expected results: The video is played with no issues.

Actual results: Video area is blank and Firefox hangs.

Notes:
1. I tested on other Ubuntu versions, 14.04 32bit, 12.04 64bit and another 14.04 64bit from a different machine and I could not reproduce the issue.
2. Did not see this issue on Mac or Windows.
3. 
Graphics
AMD Radeon™ HD 6450 Video Card

Adapter Description	X.Org -- Gallium 0.4 on AMD CAICOS
Device ID	Gallium 0.4 on AMD CAICOS
Driver Version	3.0 Mesa 10.1.3
GPU Accelerated Windows	0/1 Basic
Vendor ID	X.Org
WebGL Renderer	X.Org -- Gallium 0.4 on AMD CAICOS
windowLayerManagerRemote	false
AzureCanvasBackend	cairo
AzureContentBackend	cairo
AzureFallbackCanvasBackend	none
AzureSkiaAccelerated	0


Shockwave Flash

    File: libflashplayer.so,libflashplayer.so
    Path: /usr/lib/mozilla/plugins/libflashplayer.so,/usr/lib/flashplugin-installer/libflashplayer.so
    Version: 11.2.202.442
    State: Enabled
    Shockwave Flash 11.2 r202

MIME Type	Description	Suffixes
application/x-shockwave-flash	Shockwave Flash	swf
application/futuresplash	FutureSplash Player	spl
application/x-shockwave-flash	Shockwave Flash	swf
application/futuresplash	FutureSplash Player	spl

Comment 1

[Benjamin Smedberg]

When you say "Firefox hangs" what are the exact symptoms? Does it stop responding for a while but come back after 45 seconds, or does it stop responding completely/forever?

https://developer.mozilla.org/en-US/docs/How_to_Report_a_Hung_Firefox has tips for collecting useful hang data.

Comment 2

[Bogdan Maris, Desktop QA]

(In reply to Benjamin Smedberg  [:bsmedberg] from comment #1)
> When you say "Firefox hangs" what are the exact symptoms? Does it stop
> responding for a while but come back after 45 seconds, or does it stop
> responding completely/forever?
> 
> https://developer.mozilla.org/en-US/docs/How_to_Report_a_Hung_Firefox has
> tips for collecting useful hang data.

Firefox stops responding for ~20 seconds then it`s back up. Scrolling again will make Firefox stop again and so on. I saw that Firefox will hang only if the mouse cursor is on top of the video area and I attempt to scroll from mouse wheel. If the cursor is anywhere else on the page scrolling works as expected.

I forced two crashes while FF was hanging, here are the crash stats:
bp-20c09cc7-b973-4023-b913-400f22150209
bp-60231a81-ca76-4d86-b164-6b0292150209

Comment 3

[Benjamin Smedberg]

We're stuck in mozilla::plugins::PluginProcessParent::Launch and hitting the launch timeout, I'd expect: dom.ipc.plugins.processLaunchTimeoutSecs;45

Comment 4

[Benjamin Smedberg]

Resolving old bugs which are likely not relevant any more, since NPAPI plugins are deprecated.