Created attachment 119007 [details]
Two files: 'kmsg' and 'Xorg.0.log.old'

When I visit any WebGL site, after it's done loading everything on screen
freezes except mouse cursor. Keyboard not responding too, so only hard reset
helps :)

Kernel messages and Xorg log are in attachment.

I have already posted a topic at
https://bbs.archlinux.org/viewtopic.php?id=203765 There are some other kernel
messages.

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$ pacman -Qi mesa libdrm xf86-video-nouveau xorg-server firefox | egrep
"Name|Version" 

    Name           : mesa
    Version        : 11.0.3-1

    Name           : libdrm
    Version        : 2.4.65-1

    Name           : xf86-video-nouveau
    Version        : 1.0.11-3

    Name           : xorg-server
    Version        : 1.17.2-4

    Name           : firefox
    Version        : 41.0.2-1

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Maybe it somewhat related to https://bugs.freedesktop.org/show_bug.cgi?id=89985