X11 server lock-up and garbage on the screen

[Riccardo Mottola <riccardo.mottola%libero.it@localhost>]

Hi,

I am running 6.99.4 but I continue experience freezes where all the 
screen is filled of garbage (except the mouse pointer).

I am running on a laptop

To reproduce it, it is easy:
1) launch an imaging application written in GNUstep (PRICE, 
LaternaMagica) and open a very big image (35MPixel b&w images for example)
2) watch the screen go funky

dmesg says:
i915drm0 at vga1: Intel i915GM
i915drm0: AGP at 0xc0000000 256MB
i915drm0: Initialized i915 1.6.0 20080730


I reported this some time ago, sadly it didn't go away by itself.

I have little more information to add

1) if I try to attach a debugger, I get no fault! Instead the 
application gets killed. However, when I finally exist the debugger and 
X11, the screen goes funky afterwards! Like some erro gets "delayed"
2) the "freeze" is only local. I cannot switch consoles, no keyboard 
response, but telnet connection remain active and I can even restart X11 
and it will work.
3) with other images the applications run fine, other applications run 
fine too. I suppose that the X server gets stressed somehow.
4) if I export the display to another machine, all apps run fine and I 
can load all images I want, so it doesn't appear to be a program bug or 
at lest not an evident one.

Riccardo

PS: after the debug session I got this in dmesg

i915drm0: interrupting at ioapic0 pin 16
UVM: pid 907 (LaternaMagica), uid 1000 killed: out of swap
UVM: pid 290 (LaternaMagica), uid 1000 killed: out of swap
UVM: pid 1003 (LaternaMagica), uid 1000 killed: out of swap
UVM: pid 692 (PRICE), uid 1000 killed: out of swap
agpclose: mem 0 is bound
agpclose: mem 1 is bound
agpclose: mem 2 is bound
agpclose: mem 3 is bound
agpclose: mem 4 is bound
agpclose: mem 5 is bound
agpclose: mem 6 is bound

I wonder why the app gets killed for out of swap while the problem 
appears to be the X server! And if run with an exported display, nothing 
gets killed.

When run on an exported display, the top says for LaternaMagica:
  322 multix    85    0    68M   56M select     0:06  0.00%  0.00% 
LaternaMagic