This is not enough information to do anything about the problem. We need at least a backtrace with debugging symbols available for /usr/lib/xorg/Xorg, ideally captured with gdb.

Also please attach the full Xorg log file.

(In reply to Michel Dänzer from comment #2)
> Also please attach the full Xorg log file.

This file is huge, the latest one is 1.6GB and the latest old one with a crash is 756Mb.

(In reply to Michel Dänzer from comment #1)
> This is not enough information to do anything about the problem. We need at
> least a backtrace with debugging symbols available for /usr/lib/xorg/Xorg,
> ideally captured with gdb.

It seems the xserver-xorg-core-dbg package isn't available on my release I'll have to look up how to build it.

(In reply to renari from comment #3)
> (In reply to Michel Dänzer from comment #2)
> > Also please attach the full Xorg log file.
> 
> This file is huge, the latest one is 1.6GB and the latest old one with a
> crash is 756Mb.

Attach the first 100K or so then.

(Why does it grow that large though? Sounds like something's wrong)


> It seems the xserver-xorg-core-dbg package isn't available on my release

Debugging symbol packages are now auto-generated and available in a separate repository. Add

deb http://debug.mirrors.debian.org/debian-debug/ <suite>-debug main #contrib non-free

to /etc/apt/sources.list(.d/*) and install xserver-xorg-core-dbgsym.

Created attachment 131103 [details]
Xorg.0.log trimmed to roughly first 1000 lines.

Thread 1 "Xorg" received signal SIGPIPE, Broken pipe.
0x00007feefb484cfd in writev () at ../sysdeps/unix/syscall-template.S:84
84      ../sysdeps/unix/syscall-template.S: No such file or directory.


This is one issue that popped up, this didn't terminate the xsession though.

Yeah, SIGPIPE is normal during X server operation. Run

 handle SIGPIPE nostop noprint

at the gdb prompt to have it ignore SIGPIPE.

Once gdb stops for SIGSEGV, run

 bt full

and attach the output of that.

Thread 1 "Xorg" received signal SIGSEGV, Segmentation fault.
ProcXFixesGetCursorImageAndName (client=0x5579051bbe90)
    at ../../../../xfixes/cursor.c:510
510     ../../../../xfixes/cursor.c: No such file or directory.


bt full:
#0  ProcXFixesGetCursorImageAndName (client=0x5579051bbe90)
    at ../../../../xfixes/cursor.c:510
        rep = <optimized out>
        pCursor = 0x5579df0bb110
        image = <optimized out>
        npixels = <optimized out>
        name = <optimized out>
        width = <optimized out>
        height = <optimized out>
        rc = 0
        x = 449
        y = 40
#1  0x00005577f95955e5 in Dispatch () at ../../../../dix/dispatch.c:479
        result = <optimized out>
        start_tick = 12452280
#2  0x00005577f9599568 in dix_main (argc=10, argv=0x7ffec2a1bcc8,
    envp=<optimized out>) at ../../../../dix/main.c:287
        i = <optimized out>
        alwaysCheckForInput = {0, 1}
#3  0x00007feefb3c42b1 in __libc_start_main (main=0x5577f95831e0 <main>,
    argc=10, argv=0x7ffec2a1bcc8, init=<optimized out>, fini=<optimized out>,
    rtld_fini=<optimized out>, stack_end=0x7ffec2a1bcb8)
    at ../csu/libc-start.c:291
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 259158344007019244,
                93973772775920, 140732163800256, 0, 0, 6236008318421035756,
                6245001459393358572}, mask_was_saved = 0}}, priv = {pad = {
              0x0, 0x0, 0x7ffec2a1bd20, 0x7feefdb4c168}, data = {prev = 0x0,
              cleanup = 0x0, canceltype = -1029587680}}}
        not_first_call = <optimized out>
#4  0x00005577f958321a in _start ()
No symbol table info available.

*** This bug has been marked as a duplicate of bug 100721 ***