Re: new xorg segfault 11 with KMS


On 12/13/12 22:48, Johannes Dieterich wrote:
> On 12/13/12 16:36, Dimitry Andric wrote:
>> On 2012-12-13 21:49, Johannes Dieterich wrote:
>>> I lately see xorg segfault 11s with CURRENT, WITH_NEW_XORG=yes and
>>> WITH_KMS=yes. Interestingly, gdm loads fine but xfce4 at login directly
>>> causes the segfault (log attached), gnome survives a bit longer but
>>> starting any bigger application (e.g. firefox) causes it to crash with
>>> the
>>> same log.
>>>
>>> I have a Xorg.core file, but since it is without debug symbols the
>>> backtrace makes little sense to me.
>>
>> Please post the backtrace anyway. :-)  Or recompile xorg-server with
>> WITH_DEBUG=yes in your environment, and reproduce the crash.
> Here we go:
> 
> I also rebuild xorg with debug enabled. Interestingly, I cannot
> reproduce the crash anymore. Either I forgot to rebuild something (seems
> unlikely) or the crash has to do with optimizations or flags not present
> in a debug build.

This is not unlikely.  There are probably places in the X codebase which
depends on gcc specific behavior, or undefined behavior, by accident or
by chance.
Regards
-- 
Niclas Zeising
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