X Segmentation fault with new sapphire HD7850

Question

Hi,
randomly my X server crash and reboot (like 1 time at day, while surfing the net. No problem while playing under wine/steam)
i attach the xorg log, but it doesn't say very much to me.
can you find out what is going on or what i have to do to get a better stack trace/error log?
interesting part:
[  6057.946] (EE)
[  6057.946] (EE) Backtrace:
[  6057.981] (EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x58a416]
[  6057.981] (EE) 1: /usr/bin/X (0x400000+0x18e269) [0x58e269]
[  6057.981] (EE) 2: /usr/lib/libpthread.so.0 (0x7fd7ffa22000+0xf1e0) [0x7fd7ffa311e0]
[  6057.981] (EE) 3: /usr/lib/libpixman-1.so.0 (0x7fd7ff57e000+0x82a7d) [0x7fd7ff600a7d]
[  6057.981] (EE) 4: /usr/lib/libpixman-1.so.0 (0x7fd7ff57e000+0x50c7b) [0x7fd7ff5cec7b]
[  6057.981] (EE) 5: /usr/lib/libpixman-1.so.0 (pixman_blt+0x52) [0x7fd7ff5894b2]
[  6057.981] (EE) 6: /usr/lib/xorg/modules/libfb.so (fbCopyNtoN+0x343) [0x7fd7fbf0c453]
[  6057.981] (EE) 7: /usr/lib/xorg/modules/glesx.so (0x7fd7f9f8d000+0x8d491) [0x7fd7fa01a491]
[  6057.981] (EE) 8: /usr/lib/xorg/modules/glesx.so (0x7fd7f9f8d000+0x8f62b) [0x7fd7fa01c62b]
[  6057.981] (EE) 9: /usr/bin/X (0x400000+0x1141f9) [0x5141f9]
[  6057.981] (EE) 10: /usr/bin/X (0x400000+0xc7315) [0x4c7315]
[  6057.981] (EE) 11: /usr/bin/X (0x400000+0xc8136) [0x4c8136]
[  6057.981] (EE) 12: /usr/bin/X (0x400000+0xc6b9c) [0x4c6b9c]
[  6057.981] (EE) 13: /usr/bin/X (0x400000+0x60d86) [0x460d86]
[  6057.981] (EE) 14: /usr/bin/X (MapWindow+0x1a2) [0x463b22]
[  6057.981] (EE) 15: /usr/bin/X (0x400000+0x32690) [0x432690]
[  6057.981] (EE) 16: /usr/bin/X (0x400000+0x37e51) [0x437e51]
[  6057.981] (EE) 17: /usr/bin/X (0x400000+0x2695a) [0x42695a]
[  6057.981] (EE) 18: /usr/lib/libc.so.6 (__libc_start_main+0xf5) [0x7fd7fe8aea15]
[  6057.982] (EE) 19: /usr/bin/X (0x400000+0x26c9d) [0x426c9d]
[  6057.982] (EE)
[  6057.982] (EE) Segmentation fault at address 0x7fd7eac0b000
[  6057.982]
Fatal server error:
[  6057.982] Caught signal 11 (Segmentation fault). Server aborting
[  6057.982]
[  6057.982] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
for help.
[  6057.982] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  6057.982] (EE)
full xorg log: http://snipt.org/zJhd9

Answer 1

Here is some additional information that may or may not be of any relevance. I do not know.
On the old server, I compiled the code with the compilation commands: f95 program.for
I was able to compile and execute code with small, medium size or large arrays (with or without the additional -openmp flag).
If I repeat the same command: f95 program.for
on the new server, I get the following compilation error message for programs with medium size and large arrays:
In function `newmaxmalecor':
/mnt/ide0/home/gustaf/education/programming/cesprod100//chicago.for:4340: relocation truncated to fit: R_X86_64_32 against symbol
If I compile with the additional flags: f95 -xmodel=medium -m64 program.for
on the new server, there are no compilation errors and I can run the code in sequence.
However, when I compile with
f95 -xmodel=medim -m64 -openmp program.for
on the new server, compilation works, but I cannot execute the code with medium size and large arrays.
The programs for which I have to add the "-xmodel=medium" flag on the new server to be able to compile the code and run it in sequence, are exactly the ones for which I get segmentation faults when I introduce the openmp flag and try to execute the code in parallel fashion.
Is this just a coincidence?
Lage