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[Matthew Roughan <805346@xxxxxxxxxxxxxxxxxx>]

Seems to have something to do with fglrx_drv. I guess more than two 
monitors pushes the envelope a bit.

Its beyond my skills to debug, but I can now replicate the bug. All I 
have to do is start acroread or gnumeric, and move it between screens. 
I'd be interested to know if this same thing kills your X. Acroread 
spouts a bunch of warnings when it starts, so I guess there is something 
unusual in the way it approaches the window manager.

Since I stopped using those two, I have only had one crash.

Cheers,
Matt

On 13/07/11 04:37, Justin Cherniak wrote:
> I am also seeing this bug crop up for me.  In my case, I have a 2-card,
> 3-monitor system using xinerama.
>
> Here is the backtrace from an attached gdb session:
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007fdc0ef5beff in ?? () from /usr/lib/xorg/extra-modules/modules/drivers/fglrx_drv.so
> (gdb) bt
> #0  0x00007fdc0ef5beff in ?? () from /usr/lib/xorg/extra-modules/modules/drivers/fglrx_drv.so
> #1  0x00007fdc0ef5ba5d in ?? () from /usr/lib/xorg/extra-modules/modules/drivers/fglrx_drv.so
> #2  0x0000000000545212 in xf86RecolorCursor (pScreen=<value optimized out>, pCurs=0x2ee7d10,
>      displayed=<value optimized out>) at ../../../../hw/xfree86/ramdac/xf86HWCurs.c:225
> #3  0x0000000000545361 in xf86SetCursor (pScreen=0x26dc8b0, pCurs=0x2ee7d10, x=<value optimized out>,
>      y=<value optimized out>) at ../../../../hw/xfree86/ramdac/xf86HWCurs.c:150
> #4  0x0000000000543db8 in xf86CursorSetCursor (pDev=0x2ea9490, pScreen=0x26dc8b0, pCurs=0x2ee7d10, x=5,
>      y=239) at ../../../../hw/xfree86/ramdac/xf86Cursor.c:350
> #5  0x000000000045b60c in miPointerUpdateSprite (pDev=0x2ea9490) at ../../mi/mipointer.c:386
> #6  0x00000000004a2039 in mieqProcessInputEvents () at ../../mi/mieq.c:527
> #7  0x000000000046c709 in ProcessInputEvents () at ../../../../hw/xfree86/common/xf86Events.c:165
> #8  0x000000000042e023 in Dispatch () at ../../dix/dispatch.c:363
> #9  0x0000000000421a7e in main (argc=8, argv=<value optimized out>, envp=<value optimized out>)
>      at ../../dix/main.c:287
>
>
> ** Changed in: xorg-server (Ubuntu)
>         Status: New =>  Confirmed
>

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https://bugs.launchpad.net/bugs/805346

Title:
  Xorg crashed with SIGSEGV.

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