gedit crashed with SIGSEGV in instance_get_window()

[Bruno Girin]

Going through the Checkbox Unity Tests for Unity 5.4, got to test #120 and tried on gedit. When right-clicking on the gedit title bar and selecting close, the first time nothing happens, when doing it a second time, gedit crashes.

Steps to reproduce:
1. Start gedit
2. Right-click on the title bar
3. Select "Close": nothing happen
4. Right-click on the title bar again
5. Select "Close": gedit crashes

Expected behaviour
gedit closes on step 3

Actual behaviour
gedit crashes on step 5

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gedit 3.3.3-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Uname: Linux 3.2.0-16-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Tue Feb 14 22:06:21 2012
ExecutablePath: /usr/bin/gedit
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
ProcCmdline: gedit
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f9f15a300fb <instance_get_window+58>: mov (%rax),%rax
 PC (0x7f9f15a300fb) ok
 source "(%rax)" (0x00000001) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gedit
StacktraceTop:
 instance_get_window () from /usr/lib/gedit/plugins/libvalencia.so
 instance_active_filename () from /usr/lib/gedit/plugins/libvalencia.so
 instance_active_document_is_vala_file () from /usr/lib/gedit/plugins/libvalencia.so
 ?? () from /usr/lib/gedit/plugins/libvalencia.so
 ?? () from /usr/lib/gedit/plugins/libvalencia.so
Title: gedit crashed with SIGSEGV in instance_get_window()
UpgradeStatus: Upgraded to precise on 2012-02-11 (3 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 instance_get_window () from /tmp/tmpd_yah4/usr/lib/gedit/plugins/libvalencia.so
 instance_active_filename () from /tmp/tmpd_yah4/usr/lib/gedit/plugins/libvalencia.so
 instance_active_document_is_vala_file () from /tmp/tmpd_yah4/usr/lib/gedit/plugins/libvalencia.so
 ?? () from /tmp/tmpd_yah4/usr/lib/gedit/plugins/libvalencia.so
 ?? () from /tmp/tmpd_yah4/usr/lib/gedit/plugins/libvalencia.so

[Bruno Girin (brunogirin)]

I added the gedit-valencia-plugin package as the retrace shows it crashed in libvalencia. In addition, the fact that it crashed in instance_active_document_is_vala_file() may be a hint: as far as I remember I did not have any document open when the crash occured.

[Bruno Girin (brunogirin)]

Reported in the Yorba redmine bug tracker: http://redmine.yorba.org/issues/4751