Skype bi-directional video call crashes X server (xserver, mesa, drm, kernel from git, r600g+glamor)

[Alex Deucher]

On Tue, Oct 28, 2014 at 8:13 AM, Laszlo Kertesz
<laszlo.kertesz at gmail.com> wrote:
> Hello,
> i have an issue with Skype lately (i compile mesa, kernel, drm, xserver from
> git periodically and i use a A8-6500 with its IGP with r600g and glamor).
> It crashes the x server if i use bi directional video call. It seems to work
> in one-way video.
> The x server restarts, but skype  continues to work for about half a minute
> more, including sending video.
> One problem is that i dont see any errors in any logs, not dmesg or xorg log
> so i cant say which component is the culprit.
>
> Now it seems that a similar issue existed in the past and it was related to
> some drivers that couldnt handle multiple xv instances (one for the received
> video, the other for the local video thumbnail). And there was a workaround
> of disabling the local video thumbnail which cant be done on the current
> Skype (4.3). The glamor xv reports 16 available ports though.
>
> Is there any other way of diagnosing this error? Maybe i have some issue
> with the 32 bit driver installation?
> Although i had no problems whatsoever (gaming on Steam, vdpau etc works well
> for example) other than this.
>

Attach gdb to the xserver and get a backtrace when it crashes.  Make
sure you install the debug symbols for the xserver, etc.
http://www.x.org/wiki/Development/Documentation/ServerDebugging/

Alex