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Bug#500281: xserver-xorg-video-savage: freezes the entire system with some OpenGL screensavers



On Fri, 26 Sep 2008 23:14:55 +0200 Francesco Poli wrote:

[...]
> I left my laptop alone for a while, then I came back and found it
> with its cooling fan rotating at full speed, and the image on the
> screen completely still (a frame from the screenhack that was
> running before the lock up, that is to say
> /usr/lib/xscreensaver/atunnel).
> The system was completely unresponsive: keyboard/touchpad/mouse
> input was completely ignored.
> Even the ethernet connection to my LAN was shut down: I had an
> SSH session open from another box, but I found the connection
> reset!

I've been trying to reproduce this bug with
xserver-xorg-video-savage/1:2.3.0-1
libc6/2.9-25
xserver-xorg-core/2:1.6.3.901-1

I kept /usr/lib/xscreensaver/atunnel running for quite a while, without
any lockup at all.  I tested atunnel both in a standalone window
(started as /usr/lib/xscreensaver/atunnel from a terminal) and in the
xscreensaver-demo preview mode.

It seems that atunnel is no longer able to freeze my system.

Nonetheless, the test was not completely error free.  Indeed, some
worrying entries were logged to /var/log/kern.log:


[  582.975686] Xorg:5396 conflicting memory types 90000000-95000000 uncached-minus<->write-combining
[  582.975700] reserve_memtype failed 0x90000000-0x95000000, track uncached-minus, req uncached-minus
[  643.989097] atunnel:5735 conflicting memory types 90000000-95000000 uncached-minus<->write-combining
[  643.989123] reserve_memtype failed 0x90000000-0x95000000, track uncached-minus, req uncached-minus
[  653.768420] atunnel:5737 conflicting memory types 90000000-95000000 uncached-minus<->write-combining
[  653.768446] reserve_memtype failed 0x90000000-0x95000000, track uncached-minus, req uncached-minus
[  686.813969] atunnel:5756 conflicting memory types 90000000-95000000 uncached-minus<->write-combining
[  686.813997] reserve_memtype failed 0x90000000-0x95000000, track uncached-minus, req uncached-minus


As a consequence, I am *not* sure that the bug can be safely considered
as fixed...


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..................................................... Francesco Poli .
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