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.
Created attachment 113362 [details] dmesg right after the second freeze
The only suspect thing I saw was: http://patchwork.freedesktop.org/patch/42367/
(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.
(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.
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.
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.
I am now running 3.19 with the patch. So far so good.
Just upgraded to 3.19.1 with the patch. I had no problems with 3.19.
*** Bug 88338 has been marked as a duplicate of this bug. ***
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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