compiz crashed with SIGSEGV in nux::NTextureData::GetSurface()

[Chris Johnston]

Happened after first upgrade to 12.04

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: libnux-2.0-0 2.0.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-10.17-generic 3.2.1
Uname: Linux 3.2.0-10-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Tue Jan 24 12:25:11 2012
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f1685a081e7 <_ZNK3nux12NTextureData10GetSurfaceEi+7>: mov (%rax,%rsi,8),%rax
 PC (0x7f1685a081e7) ok
 source "(%rax,%rsi,8)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 nux::NTextureData::GetSurface(int) const () from /usr/lib/libnux-image-2.0.so.0
 nux::CreateTexture2DFromPixbuf(_GdkPixbuf*, bool) () from /usr/lib/libnux-graphics-2.0.so.0
 WindowButton::WindowButton(unity::panel::WindowButtonType) () from /usr/lib/compiz/libunityshell.so
 unity::WindowButtons::WindowButtons() () from /usr/lib/compiz/libunityshell.so
 unity::PanelMenuView::PanelMenuView(int) () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in nux::NTextureData::GetSurface()
UpgradeStatus: Upgraded to precise on 2012-01-24 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 nux::NTextureData::GetSurface (this=0x21fa200, MipLevel=<optimized out>) at ./ImageSurface.h:239
 nux::CreateTexture2DFromPixbuf (pixbuf=0x0, premultiply=true) at ./GLTextureResourceManager.cpp:80
 GetDashWindowButton (state=unity::panel::NORMAL, type=unity::panel::CLOSE, this=0x21f95b0) at /build/buildd/unity-5.0.0/plugins/unityshell/src/WindowButtons.cpp:286
 LoadImages (this=0x21f95b0) at /build/buildd/unity-5.0.0/plugins/unityshell/src/WindowButtons.cpp:162
 WindowButton::WindowButton (this=0x21f95b0, type=<optimized out>) at /build/buildd/unity-5.0.0/plugins/unityshell/src/WindowButtons.cpp:63

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Chris Johnston (cjohnston)]

This has now happened to me on two different machines.

[Tim Penhey (thumper)]

Andy, this bug directly relates to the following lines in WindowButton.cpp:

    glib::Object<GdkPixbuf> pixbuf(gdk_pixbuf_new_from_file(filename.Value(), &error));
    // not handling broken texture or missing files
    return nux::CreateTexture2DFromPixbuf(pixbuf, true);

Now obviously the pixbuf is null in this case.

Can we have a sensible default instead of seg-faulting?

[Marco Trevisan (Treviño) (3v1n0)]

Fixing the Unity part, by the way Nux shouldn't crash when CreateTexture2DFromPixbuf has the pixbuf parameter set to NULL