Bug#500214: xorg: X freezes on high load (kernel seems to enter in deadlock)

[BERTRAND Joel <joel.bertrand@systella.fr>]

Brice Goglin a écrit :
> reassign 500214 xserver-xorg-video-radeonhd
> thank you
>
> On Fri, Sep 26, 2008 at 11:35:17AM +0200, BERTRAND Joel wrote:
> > X randomly freezes system. Bug is reproductible. I have written a  
> > program that
> > does some fork(), each process using 1,7 GB. I have 4 GB of RAM and 6 GB for
> > swap. If I run this program under X, system quickly freezes (load average :
> > 10). I don't see anything in log or in console. If I try to run the same
> > program without X, system does not freeze anymore (load average : greater
> > than 30).
>
> Can you reproduce with latest radeonhd driver and xserver-xorg-core
> from experimental?
>
> We need send your config and log anyway (the log from after the
> freeze would be the best).
>
> Also, when the freeze occurs, can you ping the machine? If so,
> can you ssh and run gdb to find out what the server is doing?

	I use for a long time a driver built from xorg CVS. I have done some 
tests with and without X. Trouble come from VM kernel subsystem. If I 
force overcommit_memory = 2, I cannot reproduce this bug. Anyway, bug 
occurs _without_ any running xserver. Thus, I think there is one or more 
bugs in couple kernel/glibc and they have to be fixed before. I have 
made a bug report on kml without any answer (Kernel Bug Tracker Bug 
11671). Today, I cannot try to reproduce it...

	That being said, when system freezed, kernel was dead and I was unable 
to ping this workstation.

	Regards,

	JKB