ALex,

On Wed, 6 Jul 2005, Alex Finch wrote:

>   We have noticed severe problems with X11 under SL 4.0 here. The problems 
> mostly occur when we open windows on a remote machine and display them on a 
> machine running SL 4.0. The remote machine can be both another 4.0 machine or an 
> SL 3.03 machine, the problems are the same, suggesting it is a feature of the 
> X11 server. I note that the X11 system is now xorg-x11, not xfree86 as before, 
> and I can't help but suspect this is the culprit. Here is a list of the problems 
> we have encountered:
> 
> 1) Complete system hangs when closing windows. These are rather random and hard 
> to reproduce, but we have definitely seen them. ( No remote machine involved in 
> this case)
> 
> 2) secure shell to a remote machine with x forwarding enabled:
> 
>   emacs - click in the window to edit, sooner or later it crashes saying:
> =======
>      X protocol error: BadWindow ( invalid window parameter ) on protocol request 38
> 
>   root
> ======
> 
>      opens up, and throws up the splash window ok, but gets an error
> Error in <RootX11ErrorHandler>: BadAtom (invalid Atom parameter) (XID: 39, XREQ: 18)
> 
>   then when trying to create a browser it says
> 
> TBrowser a;
> Error in <RootX11ErrorHandler>: BadAccess (attempt to access private resource 
> denied) (XID: 64, XREQ: 102)
> 
>   we posted a message to the root people and got a suggested solution but it did 
> not work.
> 
> 3) Trying to avoid the ssh tunneling route does not work at all:
> 
>     export DISPLAY=blah:0.0
> 
>     on blah: xhost +
> 
>    just does not work.

I think that is a feature, they took it out on purpose.  If you need this
I think you have change the startup scripts for X to re-enable this.

Or use the Update 1 version which seems to have put it back.

> 
> 
> 
>   I realise these problems can not be solved by the Scientific Linux community 
> as they are not the authors, but I suspect our community may do this sort of 
> thing more often and so be more aware of it. Have other people seen it? Can it 
> be fixed?
> 
>              Alex Finch
> 

I have no idea if this will help the issues other than xhost , there is a
newer version of X with Update 1.  This is available now for testing in

ftp://ftp.scientificlinux.org/linux/scientific/40rolling/i386/

-Connie Sieh