Bug#757982: xserver segmentation fault

[Julien Cristau]

On Thu, Sep 11, 2014 at 21:17:34 +0200, repron wrote:

> Dnia 9 września 2014 5:13 Michel Dänzer <michel at daenzer.net> napisał(a):
> 
> > On 08.09.2014 20:32, repron wrote:
> > > > Last several freezes of Xorg, coused that Xorg.o.log file ended suddenly,> without SIGSEGV.
> > > I am still trying to reproduce exactly the same state of "freeze" as> mentioned in the bug.
> > > Of course it can be a bug in kernel or somewhere else but if I had> uninstalled packages
> > > xserver-xorg-video-radeon, xserver-xorg-video-iti
> > > and installed in that place packages:
> > > fglrx-modules-dkms and firmware-linux-nonfree
> > > the error of  "freezing" did not appeared.
> > >
> > (Note that the firmware-linux-nonfree package is required for the radeon 
> > driver, not for fglrx, but the information you've provided shows that it 
> > was installed)
> > 
> > 
> > It seems like the crashes you're experiencing are more or less random 
> > and all over the place. I can think of two basic explanations for that: 
> > Either the GPU is scribbling over random system memory locations, or 
> > there is a problem with the RAM or some other hardware component in the 
> > system.
> > 
> > You can test for the latter with the memtest86(+) or memtester package.
> > 
> > 
> > -- 
> > Earthling Michel Dänzer            |                  http://www.amd.com
> > Libre software enthusiast          |                Mesa and X developer
> > 
> 
> Thanks much for suggestions concerning memtest.
> In both cases (radeon or fglrx)  I had firmware-linux-nonfree
> package installed.
> The last freeze was coused by "SIGPIPE broken" and I was able
> to get a full backtrace with gdb - enclosed here as a txt file: sigpipe_backtrace.txt.
> Could you have a look at it and say somthing about it. ? 

SIGPIPE in the X server is not an issue, it's expected whenever a client
goes away.  You should continue past that signal, or tell gdb not to
stop on it.

Cheers,
Julien
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