gimp-2.6 segfault in g_variant_is_object_path()

[Moses Moore]

Binary package hint: gimp

$ lsb_release -rd
Description: Ubuntu Natty (development branch)
Release: 11.04
$ apt-cache policy gimp
gimp: Installed: 2.6.11-1ubuntu6

what I expected to happen: gimp would let me keep working on editing a palette.
what happened instead: any buttons would not receive mouse-click events. Text areas I could left-click to change focus to, and I could left-click to change focus to windows or raise them, and scrollbars were fine... but any buttons such as "okay", "cancel" or "edit" would not react at all. I gave up trying to edit a palette, closed it, opened the brush dialog... the edit button didn't work there either. Closed the brush dialog, and GIMP crashed with the sigsegv attached to this bug report.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: gimp 2.6.11-1ubuntu6
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic-pae 2.6.38
Uname: Linux 2.6.38-7-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Thu Apr 14 13:14:56 2011
ExecutablePath: /usr/bin/gimp-2.6
ProcCmdline: gimp-2.6
ProcEnviron:
 LANGUAGE=en_CA:en
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb6bb1706: movdqu (%edi),%xmm1
 PC (0xb6bb1706) ok
 source "(%edi)" (0x00000002) not located in a known VMA region (needed readable region)!
 destination "%xmm1" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gimp
StacktraceTop:
 ?? () from /lib/i386-linux-gnu/libc.so.6
 g_variant_is_object_path () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_dbus_connection_register_object () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/libdbusmenu-glib.so.3
 ?? () from /usr/lib/libdbusmenu-glib.so.3
Title: gimp-2.6 crashed with SIGSEGV in g_variant_is_object_path()
UpgradeStatus: Upgraded to natty on 2011-04-01 (13 days ago)
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev pulse pulse-access sambashare tape video www-data

[Apport retracing service (apport)]

StacktraceTop:
 __strlen_sse2_bsf () at ../sysdeps/i386/i686/multiarch/strlen-sse2-bsf.S:52
 g_variant_is_object_path (string=0x2 <Address 0x2 out of bounds>) at /build/buildd/glib2.0-2.28.5/./glib/gvariant.c:1180
 g_dbus_connection_register_object (connection=0x8d83a00, object_path=0x2 <Address 0x2 out of bounds>, interface_info=0x96ea648, vtable=0xb480ce60, user_data=0xa12da08, user_data_free_func=0, error=0xbfaf3fac) at /build/buildd/glib2.0-2.28.5/./gio/gdbusconnection.c:4698
 register_object (server=0xa12da08) at ../../libdbusmenu-glib/server.c:657
 bus_got_cb (obj=0x0, result=0xa105998, user_data=0xa12da08) at ../../libdbusmenu-glib/server.c:707