[pkg-x2go-devel] Bug#766299: nxproxy: BIG-REQUESTS patch builds but fails at runtime

[Mike Gabriel]

Hi Paul,

On  Mi 05 Nov 2014 21:43:15 CET, paul.szabo wrote:

> I just wrote:
>   Further testing suggests that as nautilus is about to die, it gets a
>   GenericEvent opcode=35 and then an event with opcode=0, then it dies.
> Maybe the issue is
>   X Generic Event Extension
>   http://www.x.org/releases/X11R7.7/doc/xextproto/geproto.html
> of variable length, as yet un-supported by nxproxy?

the question here again is if nautilus crashes

   (a) in nxagent scenarios
   (b) in nxproxy -S + Xvfb/Xephyr scenarios

While writing the above... Does nautilus directly bind to nxproxy -S  
or do you have a Xephyr (or Xvfb) xserver instance that nautilus then  
runs in / crashes in?

Do you test nautilus in some desktop shell (e.g. GNOMEv3) or do you  
launch nautilus as a standalone (aka rootless, seamless) application?

If server-side applications bind to nxproxy -S directly, then the code  
path (very roughly speaking) should be:

   (1) nautilus
   (1.1) libcairo
   (1.2) lib-X.Org's client extensions (e.g. libXext, libXrandr, etc.)
   (2) nxproxy -S
   (3) nxproxy -C
   (4) X.org server on client-side

So, basically, nxproxy should allow pass-through of everything that  
libx11-*  produces and it should be proxies through to the client side  
X.org. On the other hand, when Debian wheezy was in its final testing  
phase, we had loads of NX breakage (nxagent, that was) by libcairo.

Do you see anything in the session logs of nxproxy (or in the debug  
output if enabled at build time) that alludes to nxproxy being the  
cause of those crashes?

Also, nautilus may request some extension not supported on our  
client-side system. Or request an extension version that's not  
available. (This is more likely, when nautilus runs on top of nxagent,  
though).

Can you detect where in nautilus the crash occurs? It may be helpful  
looking at the nautilus / libcairo code that causes the crash.

Greets,
Mike


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