Re: GL-related crash w/ X 4.3 & kernel 2.6

From: Matthew Wilcox <>
Date: 2003-12-30 07:51:20
On Mon, Dec 29, 2003 at 11:57:32AM -0800, David Mosberger wrote:
> >>>>> On Mon, 29 Dec 2003 19:41:44 +0000, Matthew Wilcox <> said:
>   Matthew> The machine is a zx2000 workstation with a Radeon 7000/VE
>   Matthew> card.  Kernel is 2.6.0 plus some additional changes (mostly
>   Matthew> jgarzik's latest netdrivers patch) [but it's happened with
>   Matthew> other 2.6 kernels].  The X server is Debian's 4.3.0-0pre1v5
>   Matthew> [but it's happened with other 4.3.0 releases].
> Do you have DRI enabled?  I pretty much had given up on Radeon hw
> accelleration, because if failed for me in the same manner on both x86
> and ia64.  Perhaps things have improved in the meantime?

Yes, I do have hardware acceleration turned on.  It's just not practical
to try playing a 3d game without it.  As a metric, ISTR glxgears going
from something like 80 to 600 frames per second from software to hardware

>   Matthew> Second, since neither strace nor gdb is willing to
>   Matthew> cooperate in helping to track this down, can anyone more
>   Matthew> knowledgable than I about the ways of GL suggest how to
>   Matthew> start debugging this?
> You mean you can't use gdb to attach to the CPU-hogging processes?  My
> guess would be that the server and the app get stuck trying to acquire
> a lock, which is incidentally an area that the Radeon DRI driver had
> problems with in the past.

It's certainly consistent with their behaviour -- spinning waiting for
a lock.  I guess the next step is to try a 2.4 kernel so I can see if
the kernel is failing to release a lock or if the X server/application
is the one doing the Bad Thing.

"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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Received on Mon Dec 29 15:52:43 2003

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