Thanks for that hint. I can reproduce the crash under GNOME shell and
Adwaita theme.

** Changed in: apport (Ubuntu)
       Status: Incomplete => In Progress

** Also affects: apport (Ubuntu Precise)
   Importance: High
     Assignee: Martin Pitt (pitti)
       Status: In Progress

** Description changed:

- Simple Scan application crashed in the middle of a multi-page scan job.
+ apport-gtk crashes when using the Adwaita theme.
+ 
+ TEST CASE:
+  - Install gnome-themes-standard
+  - Change theme to "Adwaita"
+  - generate a crash of an application with an icon, e. g.
+ 
+    gedit &
+    killall -SEGV gedit
+ 
+  - Wait for apport to pop up
+  - apport-gtk crashes.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: apport-gtk 1.92-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-17.26-generic-pae 3.2.6
  Uname: Linux 3.2.0-17-generic-pae i686
  ApportVersion: 1.92-0ubuntu1
  Architecture: i386
  CrashCounter: 1
  Date: Mon Feb 20 15:54:30 2012
  ExecutablePath: /usr/share/apport/apport-gtk
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120104)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/share/apport/apport-gtk
  ProcEnviron:
-  LANGUAGE=en_CA:en
-  PATH=(custom, no user)
-  LANG=en_CA.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_CA:en
+  PATH=(custom, no user)
+  LANG=en_CA.UTF-8
+  SHELL=/bin/bash
  SegvAnalysis:
-  Segfault happened at: 0xb624a4b8:    mov    %al,(%edi)
-  PC (0xb624a4b8) ok
-  source "%al" ok
-  destination "(%edi)" (0xb54ec21c) in non-writable VMA region: 
0xb5409000-0xb57f7000 r--p /usr/share/icons/gnome/icon-theme.cache
+  Segfault happened at: 0xb624a4b8:    mov    %al,(%edi)
+  PC (0xb624a4b8) ok
+  source "%al" ok
+  destination "(%edi)" (0xb54ec21c) in non-writable VMA region: 
0xb5409000-0xb57f7000 r--p /usr/share/icons/gnome/icon-theme.cache
  SegvReason: writing VMA /usr/share/icons/gnome/icon-theme.cache
  Signal: 11
  SourcePackage: apport
  StacktraceTop:
-  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
-  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
-  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
-  gdk_pixbuf_composite () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
-  ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
+  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
+  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
+  ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
+  gdk_pixbuf_composite () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
+  ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
  Title: apport-gtk crashed with SIGSEGV in gdk_pixbuf_composite()
  UpgradeStatus: Upgraded to precise on 2012-02-14 (6 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

** Description changed:

- apport-gtk crashes when using the Adwaita theme.
+ apport-gtk crashes when using the Adwaita theme. I also see this
+ assertion:
+ 
+ (test_ui_gtk.py:3438): GdkPixbuf-CRITICAL **: gdk_pixbuf_composite:
+ assertion `dest_x >= 0 && dest_x + dest_width <= dest->width' failed
+ 
  
  TEST CASE:
-  - Install gnome-themes-standard
-  - Change theme to "Adwaita"
-  - generate a crash of an application with an icon, e. g.
+  - Install gnome-themes-standard
+  - Change theme to "Adwaita"
+  - generate a crash of an application with an icon, e. g.
  
-    gedit &
-    killall -SEGV gedit
+    gedit &
+    killall -SEGV gedit
  
-  - Wait for apport to pop up
-  - apport-gtk crashes.
+  - Wait for apport to pop up
+  - apport-gtk crashes.
+ 
+ Alternatively you can also run the apport test suite (test/run ui_gtk),
+ which reproduces this as well under the Adwaita theme.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: apport-gtk 1.92-0ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-17.26-generic-pae 3.2.6
  Uname: Linux 3.2.0-17-generic-pae i686
  ApportVersion: 1.92-0ubuntu1
  Architecture: i386
  CrashCounter: 1
  Date: Mon Feb 20 15:54:30 2012
  ExecutablePath: /usr/share/apport/apport-gtk
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120104)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python /usr/share/apport/apport-gtk
  ProcEnviron:
   LANGUAGE=en_CA:en
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0xb624a4b8:    mov    %al,(%edi)
   PC (0xb624a4b8) ok
   source "%al" ok
   destination "(%edi)" (0xb54ec21c) in non-writable VMA region: 
0xb5409000-0xb57f7000 r--p /usr/share/icons/gnome/icon-theme.cache
  SegvReason: writing VMA /usr/share/icons/gnome/icon-theme.cache
  Signal: 11
  SourcePackage: apport
  StacktraceTop:
   ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
   ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
   ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
   gdk_pixbuf_composite () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
   ffi_call_SYSV () from /usr/lib/i386-linux-gnu/libffi.so.6
  Title: apport-gtk crashed with SIGSEGV in gdk_pixbuf_composite()
  UpgradeStatus: Upgraded to precise on 2012-02-14 (6 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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Title:
  apport-gtk crashed with SIGSEGV in composite_line()

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