Bug 89085

Summary: [HSW] General protection fault and desktop freeze while browsing web
Product: DRI Reporter: Petteri Markkula <markkulapetteri>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs, mikhail.v.gavrilov, przanoni
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
URL: http://patchwork.freedesktop.org/patch/42367/
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
/var/log/kern.log of first freeze
none
dmesg right after the second freeze none

Description Petteri Markkula 2015-02-11 16:52:58 UTC 
Created attachment 113361 [details]
/var/log/kern.log of first freeze

I first reported this in kernel bugzilla before realizing that this is better place.

My Acer c720 chromebook running Ubuntu 14.04 with mainline kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-vivid/ has had desktop freezes about once per day after kernel upgrade.

First freeze happened couple hours after upgrade (yesterday). Laptop didn't react to keyboard or mouse anymore. I didn't try to take remote connection that time. Power off/on fixed problem and I had no more freezes during that day. I noticed in the evening that kern.log had trace in it.

Second freeze happened today again while browsing. This time I tried to take remote connection and succeeded. dmesg output just after the crash is as attachment. I tried to restart lightdm, but it got stuck after it said that it had stopped service. I killed it with ctrl-c and rebooted laptop succesfully.

3.18.[5,6] have worked fine for me.
Comment 1 Petteri Markkula 2015-02-11 16:53:57 UTC 
Created attachment 113362 [details]
dmesg right after the second freeze
Comment 2 Chris Wilson 2015-02-12 07:53:57 UTC 
The only suspect thing I saw was: http://patchwork.freedesktop.org/patch/42367/
Comment 3 Jani Nikula 2015-02-12 08:41:17 UTC 
(In reply to Chris Wilson from comment #2)
> The only suspect thing I saw was:
> http://patchwork.freedesktop.org/patch/42367/

Reporter says 3.18 worked fine, and Ben's patch was merged in v3.15. But worth a shot anyway, as the timing may have changed due to something else.
Comment 4 Jani Nikula 2015-02-23 13:04:06 UTC 
(In reply to Jani Nikula from comment #3)
> (In reply to Chris Wilson from comment #2)
> > The only suspect thing I saw was:
> > http://patchwork.freedesktop.org/patch/42367/
> 
> Reporter says 3.18 worked fine, and Ben's patch was merged in v3.15. But
> worth a shot anyway, as the timing may have changed due to something else.

Petteri, please try Chris' patch and report back.
Comment 5 Petteri Markkula 2015-02-23 18:01:59 UTC 
I'll try to test the patch tomorrow. It may take a while before anything conclusive can be said about it, because after the second freeze I have not experienced anything like them. I have now used 3.19 much longer than I ever used 3.18.6 and I think I am approaching the time I used 3.18.5.

I even tried to cause the freeze one evening by madly opening tabs in firefox, but system just slowed down and became unresponsive for a while.
Comment 6 Jani Nikula 2015-02-24 14:04:41 UTC 
Presumed fixed by

commit 6c31a614c43ae274546f736b2a33363e149c3dc2
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Feb 12 07:53:18 2015 +0000

    drm/i915: Check obj->vma_list under the struct_mutex

in drm-intel-fixes.
Comment 7 Petteri Markkula 2015-02-24 21:37:16 UTC 
I am now running 3.19 with the patch. So far so good.
Comment 8 Petteri Markkula 2015-03-09 14:32:31 UTC 
Just upgraded to 3.19.1 with the patch. I had no problems with 3.19.
Comment 9 Chris Wilson 2015-03-13 08:04:27 UTC 
*** Bug 88338 has been marked as a duplicate of this bug. ***
Comment 10 Petteri Markkula 2015-04-02 16:55:14 UTC 
I have been using 3.19.2, which has Chris' patch, from its release without problems. I think this bug can be closed.

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