Xorg crashed with SIGSEGV in xf86XVRegetVideo

[Tormod Volden]

(Gutsy up to date, ~triibe-3)
I had switched to a console, and then back to X. The screen was not properly refreshed and seemed to hang. I switched back to the console again, but then the X server restarted.

ProblemType: Crash
Architecture: i386
Date: Wed Jul 18 20:42:40 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/Xorg
NonfreeKernelModules: cdrom
Package: xserver-xorg-core 2:1.3.0.0.dfsg-6ubuntu2
PackageArchitecture: i386
ProcCmdline: /usr/bin/X :0 -br -audit 0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
ProcCwd: /etc/X11
ProcEnviron:
 LANGUAGE=
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 LANG=en_US.UTF-8
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ?? ()
 ?? ()
 ?? () from /lib/ld-linux.so.2
 ?? ()
 ?? ()
Title: Xorg crashed with SIGSEGV
Uname: Linux viki 2.6.22-8-generic #1 SMP Thu Jul 12 15:59:45 GMT 2007 i686 GNU/Linux
UserGroups:

[Bugzi09-fdo-tormod (bugzi09-fdo-tormod)]

Created an attachment (id=10794)
my xorg.conf

(BusType is PCI and BCIforXv is disabled)

[Bugzi09-fdo-tormod (bugzi09-fdo-tormod)]

Created an attachment (id=10795)
my Xorg log

[Bugzi09-fdo-tormod (bugzi09-fdo-tormod)]

Created an attachment (id=10796)
debug stacktrace

I guess it crashed here (line 712 in xf86xv.c):
  pScreen = portPriv->pDraw->pScreen;

since portPriv->pDraw is 0.

(gdb) print *portPriv
$2 = {pScrn = 0x8211430, pDraw = 0x0, type = 0 '\0', subWindowMode = 0, clipOrg = {x = 0, y = 0}, clientClip = 0x0, pCompositeClip = 0x2c, FreeCompositeClip = 0, AdaptorRec = 0x82583d0, isOn = XV_OFF, moved = 0, vid_x = 0, vid_y = 0, vid_w = 0, vid_h = 0, drw_x = 0, drw_y = 0, drw_w = 0, drw_h = 0, DevPriv = {ptr = 0x82584bc, val = 136676540, uval = 136676540, fptr = 0x82584bc}}

I don't know if this is useful:
Before xf86XVEnterVT calls WalkTree, it calls ScreenPriv->EnterVT which is CMapEnterVT:

(gdb) print *(XF86XVScreenPtr) ((XvScreenPtr) pScreen->devPrivates[XF86XvScreenIndex].ptr)->devPriv.ptr
$24 = {DestroyWindow = 0xb7ce4a00 <XvDestroyWindow>, ClipNotify = 0xb7c73a60 <DRIClipNotify>, WindowExposures = 0xb7c72a30 <DRIWindowExposures>, AdjustFrame = 0xb7c73200 <DRIAdjustFrame>, EnterVT = 0x80d08d0 <CMapEnterVT>, LeaveVT = 0xaf99b480 <XAALeaveVT>, videoGC = 0x0}

[Bugzi09-fdo-tormod (bugzi09-fdo-tormod)]

To see if it was a regression in the new savage driver, I went back to 2.1.2-5 (git from some months ago) but I could still reproduce. I also disabled DRI but no change.

After logging in, it seems that I can switch back and forth without problem for a while. But if I start Rhythmbox and start playing, the album cover is displayed - which I guess uses xv - and then X will crash if I switch to a console and back.

[Tormod Volden (tormodvolden)]

(Gutsy up to date, ~triibe-3)
I had switched to a console, and then back to X. The screen was not properly refreshed and seemed to hang. I switched back to the console again, but then the X server restarted.

ProblemType: Crash
Architecture: i386
Date: Wed Jul 18 20:42:40 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/Xorg
NonfreeKernelModules: cdrom
Package: xserver-xorg-core 2:1.3.0.0.dfsg-6ubuntu2
PackageArchitecture: i386
ProcCmdline: /usr/bin/X :0 -br -audit 0 -auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
ProcCwd: /etc/X11
ProcEnviron:
 LANGUAGE=
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 LANG=en_US.UTF-8
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ?? ()
 ?? ()
 ?? () from /lib/ld-linux.so.2
 ?? ()
 ?? ()
Title: Xorg crashed with SIGSEGV
Uname: Linux viki 2.6.22-8-generic #1 SMP Thu Jul 12 15:59:45 GMT 2007 i686 GNU/Linux
UserGroups:

[Tormod Volden (tormodvolden)]

I installed xserver-xorg-core-dbg and got this backtrace. Interesting that it crashes in an xv function: I recently had to disable BCIforXv since it would totally hang the computer.

[Apport retracing service (apport)]

StacktraceTop:?? ()
?? ()
?? ()
?? ()
?? ()

[Tormod Volden (tormodvolden)]

Wow, that apport retracing was useful, not :)

I guess it crashed here (line 712 in xf86xv.c):
  pScreen = portPriv->pDraw->pScreen;

since portPriv->pDraw is 0.

(gdb) print *portPriv
$2 = {pScrn = 0x8211430, pDraw = 0x0, type = 0 '\0', subWindowMode = 0, clipOrg = {x = 0, y = 0}, clientClip = 0x0, pCompositeClip = 0x2c, FreeCompositeClip = 0, AdaptorRec = 0x82583d0, isOn = XV_OFF, moved = 0, vid_x = 0, vid_y = 0, vid_w = 0, vid_h = 0, drw_x = 0, drw_y = 0, drw_w = 0, drw_h = 0, DevPriv = {ptr = 0x82584bc, val = 136676540, uval = 136676540, fptr = 0x82584bc}}

[Tormod Volden (tormodvolden)]

Just making some notes here: Before xf86XVEnterVT calls WalkTree, it calls ScreenPriv->EnterVT which is CMapEnterVT:

(gdb) print *(XF86XVScreenPtr) ((XvScreenPtr) pScreen->devPrivates[XF86XvScreenIndex].ptr)->devPriv.ptr
$24 = {DestroyWindow = 0xb7ce4a00 <XvDestroyWindow>, ClipNotify = 0xb7c73a60 <DRIClipNotify>, WindowExposures = 0xb7c72a30 <DRIWindowExposures>, AdjustFrame = 0xb7c73200 <DRIAdjustFrame>, EnterVT = 0x80d08d0 <CMapEnterVT>, LeaveVT = 0xaf99b480 <XAALeaveVT>, videoGC = 0x0}

[Bugzi09-fdo-tormod (bugzi09-fdo-tormod)]

I am not able to reproduce any longer, using xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu2 and xserver-xorg-video-savage 1:2.1.2-6, no options in xorg.conf.

[Tormod Volden (tormodvolden)]

I am not able to reproduce any longer, using xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu2 and xserver-xorg-video-savage 1:2.1.2-6, no options in
xorg.conf.

Some time after doing all the switching tests, I got a solid system freeze. But that can be something completely different.