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

[Alex Deucher]

On Thu, Dec 18, 2014 at 5:03 PM, Kertesz Laszlo
<laszlo.kertesz at gmail.com> wrote:
> On Tue, 2014-10-28 at 09:41 -0400, Alex Deucher wrote:
>> 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
>
> I idd a bdb trace a while back and it does seem incomplete probably
> because something wasnt compiled with debug on.
>
> Program received signal SIGABRT, Aborted.
> 0x00007f530e3d5077 in __GI_raise (sig=sig at entry=6)
>     at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
> 56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
> Continuing.
> [Thread 0x7f53083d7700 (LWP 32676) exited]
>
> Program terminated with signal SIGABRT, Aborted.
> The program no longer exists.
>
> Anyway, the cause is clearly glamor on r600g related as i have disabled
> glamor and on exa i did not have any such issues.
> Even with the newest xserver git build it does crash nonetheless.
>

The question is whether the issue is in glamor or r600g or mesa.

Alex