1265549 - E10s & HWA Slow & Crashes Firefox on Low End Systems

Status: RESOLVED WORKSFORME

(Core :: Graphics, defect)

Description

[Michelle Funches - QA]

Acer Switch 10E (Touch Tablet Laptop)
PROCESSOR:  Z3735F@1.33GHz		
RAM: 	    2GB		
GRAPHICS:   Intel HD Graphics Direct 3D11		
BUILD ARCH: Version 10.0 - 10240
Access youtube.com and watch a couple videos
Switch between Full Screen as you watch
E10s is applied via pref browser.tabs.remote.force-enable;true
HWA is checked
Observe: Firefox Crashed
Consistent: No
Occurred only when E10s & HWA were enabled
https://crash-stats.mozilla.com/report/index/bp-fee1468e-82e3-41b1-9e74-5e20b2160413

Comment 1

[Michelle Funches - QA]

Additional errors seen
Facebook [https://crash-stats.mozilla.com/report/index/bp-6478c7fd-304f-4644-8d5e-750a12160413]
  E10s & HWA both On, crash occurred
  E10s/HWA both off, play is fine
  E10s On HWA off play is fine
  E10s Off HWA on play is choppy/lags

Yahoo/Movies due to Throttling [https://crash-stats.mozilla.com/report/index/bp-38cf1d84-6885-4470-980b-c97332160418] 
  E10s & HWA both On, crash occurred
  E10s/HWA both off, play is fine
  E10s On HWA off play is fine
  E10s Off HWA on play is choppy/lags

Comment 2

[Chris Pearce [:cpearce (Not reading bugmail)]]

Looks like a graphics problem based on the stack.

Comment 3

[Jim Mathies [:jimm]]

(In reply to Michelle Funches - QA from comment #0)
> Acer Switch 10E (Touch Tablet Laptop)
> PROCESSOR:  Z3735F@1.33GHz		
> RAM: 	    2GB		
> GRAPHICS:   Intel HD Graphics Direct 3D11		
> BUILD ARCH: Version 10.0 - 10240
> Access youtube.com and watch a couple videos
> Switch between Full Screen as you watch
> E10s is applied via pref browser.tabs.remote.force-enable;true
> HWA is checked
> Observe: Firefox Crashed
> Consistent: No
> Occurred only when E10s & HWA were enabled
> https://crash-stats.mozilla.com/report/index/bp-fee1468e-82e3-41b1-9e74-
> 5e20b2160413

accessibility is active here, and there's an a11y failure in the ipc error notes - 

(msgtype=0x2C0004,name=PBrowser::Msg_PDocAccessibleConstructor) Processing error: message was deserialized, but the handler returned false (indicating failure)

Michelle, are you sure you had a11y forced off? Your crash reports indicate it was active.

Comment 4

[Michelle Funches - QA]

Confirming: I rechecked the settings i applied: 
browser.tabs.remote.force-enable; true
HWA = checked
accessibility.force_disabled; 1 ( presume it is set correct as I see 1/1 enabled by user vs. disabled by accessibility.
I accessed Youtube,Facebook, and Yahoo but while I still see lagging and slow response, I have not seen a crash;
The Yahoo movie trailer London has fallen is the best at displaying the slowness, it often pauses for long intervals before continuing to play however it still has not crashed.

Comment 5

[Jim Mathies [:jimm]]

I've confirmed that if the crash report says Accessibility is active, it is active even when using accessibility.force_disabled. So these crashes were in fact accessibility relate.

Comment 6

[Ryan VanderMeulen [:RyanVM]]

(In reply to Michelle Funches - QA from comment #4)
> Confirming: I rechecked the settings i applied: 
> browser.tabs.remote.force-enable; true
> HWA = checked
> accessibility.force_disabled; 1 ( presume it is set correct as I see 1/1
> enabled by user vs. disabled by accessibility.
> I accessed Youtube,Facebook, and Yahoo but while I still see lagging and
> slow response, I have not seen a crash;
> The Yahoo movie trailer London has fallen is the best at displaying the
> slowness, it often pauses for long intervals before continuing to play
> however it still has not crashed.

Is it possible to disable the touchscreen at the Windows or BIOS level? Ideally we'd like Firefox to not even know it's running on a touchscreen system.

Comment 7

[Michelle Funches - QA]

Yes, I will investigating as Tablet PC Settings and the  Pen & Touch options don't allow immediate disabling.

Comment 8

[Michelle Funches - QA]

Disable touch in Windows; performed on Aspire Switch 10E 
Device Manager > Human Interface Devices > HID-compliant touch screen (Disable)
Confirming: touch has no effect and Firefox startup is 
Multi-process = 1/1 (Enabled by default)
accessibility.loadedInLastSession = false

Comment 9

[Michelle Funches - QA]

Youtube, Yahoo Movies, Facebook E10s & HWA enabled = all is well. The general lagging and pausing observed earlier is greatly reduced. Closing this issue WFM.
Version 	49.0a1
Build ID 	20160426044609
User Agent 	Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0