Xorg Program received signal SIGSEGV, Segmentation fault, xubuntu 8.04 and wine 0.9.59-0ubuntu5 crashs the xserver

Thanks for the backtrace, this seems to indicate that the fault is something like this:

    pScrn = xf86Screens[scrnIndex]; // does bad data get in here?
    pVidMode = VMPTR(pScrn->pScreen);
    pVidMode->First = pScrn->modes; // First set to Invalid pointer?
    pVidMode->Next = pVidMode->First->next; // Crash

My guess is that adding a check for pVidMode->First would eliminate the crash.

Hi Bryce,

thanks for look in to it,
is somehing what i cann help you to work on it?

best wisches
bofh

-------- Original-Nachricht --------
> Datum: Thu, 03 Jul 2008 19:20:43 -0000
> Von: Bryce Harrington <email address hidden>
> An: <email address hidden>
> Betreff: [Bug 237993] Re: Xorg Program received signal SIGSEGV, Segmentation fault, xubuntu 8.04 and wine 0.9.59-0ubuntu5 crashs the xserver

> Thanks for the backtrace, this seems to indicate that the fault is
> something like this:
>
> pScrn = xf86Screens[scrnIndex]; // does bad data get in here?
> pVidMode = VMPTR(pScrn->pScreen);
> pVidMode->First = pScrn->modes; // First set to Invalid pointer?
> pVidMode->Next = pVidMode->First->next; // Crash
>
> My guess is that adding a check for pVidMode->First would eliminate the
> crash.
>
> ** Changed in: xorg (Ubuntu)
> Importance: Undecided => High
> Assignee: (unassigned) => Bryce Harrington (bryceharrington)
> Status: New => Triaged
>
> --
> Xorg Program received signal SIGSEGV, Segmentation fault, xubuntu 8.04 and
> wine 0.9.59-0ubuntu5 crashs the xserver
> https://bugs.launchpad.net/bugs/237993
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in “xorg” source package in Ubuntu: Triaged
>
> Bug description:
> Binary package hint: xorg
>
> xubuntu 8.04 and wine 0.9.59-0ubuntu5 crashs the xserver, Xorg Program
> received signal SIGSEGV, Segmentation fault.
>
> bofh@xbox:# wine
> preloader: Warning: failed to reserve range 00000000-60000000
> preloader: Warning: failed to reserve range 00000000-60000000
> err:dosmem:setup_dos_mem Cannot use first megabyte for DOS address space,
> please report
> preloader: Warning: failed to reserve range 00000000-60000000
> err:dosmem:setup_dos_mem Cannot use first megabyte for DOS address space,
> please report
> err:dosmem:setup_dos_mem Cannot use first megabyte for DOS address space,
> please report
> XIO: fatal IO error 11 (Resource temporarily unavailable) on X server
> ":0.0"
> after 76 requests (74 known processed) with 0 events remaining.
>
>
> root@xbox:/var/log# cat /etc/lsb-release
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=8.04
> DISTRIB_CODENAME=hardy
> DISTRIB_DESCRIPTION="Ubuntu 8.04"
> root@xbox:/var/log#
>
> root@xbox:/var/log# uname -a
> Linux xbox 2.6.24-18-generic #1 SMP Wed May 28 19:28:38 UTC 2008 x86_64
> GNU/Linux
> root@xbox:/var/log#
>
> root@xbox:/var/log# grep -i WARNING daemon.log | tail -1
> Jun 6 22:27:15 xbox gdm[7215]: WARNING: gdm_slave_xioerror_handler:
> Schwerwiegender X-Fehler - :0 wird neu gestartet
> root@xbox:/var/log#
>
> Attachmt files backtrace full form xorg, Xorg.0.log, and dmesg
>
> Memtest86 and burnK7 done with out errors.

Sorry, I've been busy and out of town most of July.
The next step for this bug probably is to report it upstream, or to rig up a patch to check for the invalid value. If you're feeling ambitious, feel free to do either; if not, I'll hopefully get time to work on it within the next couple weeks.

I took the freedom to report this upstream here: http://bugs.freedesktop.org/show_bug.cgi?id=17431

Great, thanks for taking the initiative on that.

Looks like I fixed this one already for bug 300310, uploaded as version 2:1.5.99.902-0ubuntu2

    pScrn = xf86Screens[scrnIndex];
    pVidMode = VMPTR(pScrn->pScreen);
    if (pScrn->modes == NULL)
        return FALSE;

    pVidMode->First = pScrn->modes;
    pVidMode->Next = pVidMode->First->next;