Divide by 0 (dy is 0) unity-window-decorator crashed with SIGFPE in _decor_blend_horz_border_picture()

[Dave Gilbert]

Binary package hint: compiz

I'm not sure if this is related to the crash I'm seing in compiz #709906, but this one seems easier to diagnose.

I'm seeing:
unity-window-de[2095] trap divide error ip:7ff0ecb4d1f2 sp:7fffd910eef0 error:0 in libdecoration.so.0.0.0[7ff0ecb4b000+8000]

in the logs and from the core it looks like this is from:

            transform.matrix[1][1] = (left << 16) / dy;
in _decor_blend_horz_border_picture

why that's a zero - well I don't know, but it seems at worth checking rather than letting it crash.

Dave

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-gnome 1:0.9.2.1+glibmainloop4-0ubuntu7
ProcVersionSignature: Ubuntu 2.6.37-2.10-generic 2.6.37-rc1
Uname: Linux 2.6.37-2-generic x86_64
Architecture: amd64
CompisitorRunning: None
CompizPlugins: No value set for `/apps/compiz-1/general/allscreens/options/active_plugins'
CrashCounter: 1
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x800
 edid-base64: AP///////wBMozM2AAAAAAAPAQOAIRV4Cof1lFdPjCcnUFQAAAABAQEBAQEBAQEBAQEBAQEB7hoAgFAgEDAQMBMAS88QAAAZAAAADwAAAAAAAAAAACOHAmQCAAAA/gBTQU1TVU5HCiAgICAgAAAA/gBMVE4xNTRYMy1MMDYKAHA=
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: Off
 modes: 1024x768 800x600 800x600 848x480 640x480
 edid-base64:
Date: Sun Jan 30 14:28:10 2011
DistUpgraded: Yes, recently upgraded Log time: 2010-07-24 18:47:52.187518
DistroCodename: natty
DistroVariant: ubuntu
ExecutablePath: /usr/bin/unity-window-decorator
GraphicsCard:
 Subsystem: Toshiba America Info Systems Device [1179:ff10]
   Subsystem: Toshiba America Info Systems Device [1179:ff10]
Lsusb:
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: TOSHIBA Equium A100
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdline: /usr/bin/unity-window-decorator
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LC_MESSAGES=en_AG.utf8
 LANG=en_US.UTF-8
 LANGUAGE=en_GB.UTF-8:en
ProcKernelCmdLine: root=UUID=031a90fc-7cc9-4daf-bb3f-4bb3f68653ac ro quiet splash crashkernel=384M-2G:64M,2G-:128M
Renderer: Hardware acceleration
Signal: 8
SourcePackage: compiz
StacktraceTop:
 _decor_blend_horz_border_picture (xdisplay=0x2366760, src=100681866, xSrc=0, ySrc=0, dst=100681864, region=0x24e4b10, alpha=49151, shade_alpha=1, x1=6, y1=4, x2=1280, y2=4, dy=0, direction=-1, ignore_src_alpha=0, context=<value optimised out>, layout=<value optimised out>) at /build/buildd/compiz-0.9.2.1+glibmainloop4/libdecoration/decoration.c:2222
 decor_blend_border_picture (xdisplay=0x2366760, context=<value optimised out>, src=<value optimised out>, xSrc=<value optimised out>, ySrc=<value optimised out>, dst=100681864, layout=0x24e27d8, border=0, region=0x24e4b10, alpha=49151, shade_alpha=1, ignore_src_alpha=0) at /build/buildd/compiz-0.9.2.1+glibmainloop4/libdecoration/decoration.c:2542
 meta_draw_window_decoration ()
 ?? ()
 g_main_dispatch (context=0x237d0c0) at /build/buildd/glib2.0-2.27.92/glib/gmain.c:2440
Title: unity-window-decorator crashed with SIGFPE in _decor_blend_horz_border_picture()
UnitySupportTest:

UserGroups: adm admin audio cdrom dialout dip floppy libvirtd lpadmin plugdev scanner uml-net video
dmi.bios.date: 10/23/2006
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 2.10
dmi.board.name: MPAD-MSAE Customer Reference Boards
dmi.board.vendor: Intel Corporation
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr2.10:bd10/23/2006:svnTOSHIBA:pnEquiumA100:pvrPSAABE-00J008EN:rvnIntelCorporation:rnMPAD-MSAECustomerReferenceBoards:rvrNotApplicable:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: Equium A100
dmi.product.version: PSAABE-00J008EN
dmi.sys.vendor: TOSHIBA
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10-1ubuntu1
version.xserver-xorg: xserver-xorg 1:7.5+6ubuntu8
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2+git20110124.fadee040-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu1

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #708520, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.