unity-panel-service crashed with SIGSEGV in g_variant_unref()

[Eliah Kagan]

On an Oneiric i386 system in a 3D Unity session with unity-services 4.16.0-0ubuntu2, unity-panel-service crashed shortly after I had adjusted the sound volume. That may have been a coincidence though, especially considering that I had adjusted the sound volume several times earlier during the same session, without problems, and the crash did not appear to occur *while* the sound volume was being adjusted. (The volume changed successfully, and then about a second later the crash happened.)

This was also shortly (probably a couple of minutes) after I experienced bug 839286 and bug 839828 (see duplicate bug 858887), but I suspect, even more strongly, that is a coincidence as well.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-services 4.16.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic i686
ApportVersion: 1.23-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,regex,mousepoll,vpswitch,gnomecompat,place,session,imgpng,animation,snap,resize,workarounds,move,grid,wall,unitymtgrabhandles,expo,ezoom,fade,scale,unityshell]
Date: Sun Sep 25 09:22:43 2011
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SegvAnalysis:
 Segfault happened at: 0x9084e3 <g_variant_unref+35>: lock xadd %eax,0x14(%esi)
 PC (0x009084e3) ok
 source "%eax" ok
 destination "0x14(%esi)" (0x00000014) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 g_variant_unref (value=0x0) at /build/buildd/glib2.0-2.29.92/./glib/gvariant-core.c:617
 g_settings_get_boolean (settings=0x9f7f318, key=0x96971bf "show-seconds") at /build/buildd/glib2.0-2.29.92/./gio/gsettings.c:1988
 generate_format_string_full (show_day=0, show_date=0) at /build/buildd/indicator-datetime-0.2.95/./src/utils.c:188
 generate_format_string_now (self=<optimized out>) at /build/buildd/indicator-datetime-0.2.95/./src/indicator-datetime.c:1150
 indicator_datetime_init (self=0x9e84690) at /build/buildd/indicator-datetime-0.2.95/./src/indicator-datetime.c:309
Title: unity-panel-service crashed with SIGSEGV in g_variant_unref()
UpgradeStatus: Upgraded to oneiric on 2011-06-18 (98 days ago)
UserGroups: adm admin dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 g_variant_unref (value=0x0) at /build/buildd/glib2.0-2.29.92/./glib/gvariant-core.c:617
 g_settings_get_boolean (settings=0x9f7f318, key=0x96971bf "show-seconds") at /build/buildd/glib2.0-2.29.92/./gio/gsettings.c:1988
 generate_format_string_full (show_day=0, show_date=0) at /build/buildd/indicator-datetime-0.2.95/./src/utils.c:188
 generate_format_string_now (self=<optimized out>) at /build/buildd/indicator-datetime-0.2.95/./src/indicator-datetime.c:1150
 indicator_datetime_init (self=0x9e84690) at /build/buildd/indicator-datetime-0.2.95/./src/indicator-datetime.c:309

[Launchpad Janitor (janitor)]

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

[Javier Jardón (jjardon)]

Hello Eliah Kagan,

Are you using a custom string to show the date?

[Javier Jardón (jjardon)]

After more investigation, Seems a problem with the instalation of the schema file.

Upgrade to the latest indicator-datetime version and check that /usr/share/glib-2.0/schemas/com.canonical.indicator.datetime.gschema.xml exist

[Eliah Kagan (degeneracypressure)]

This bug's statuses suggest to me that the issue is now fixed. Should I still try to provide the information that was requested?

[Javier Jardón (jjardon)]

@Eliah: no, Its not needed as the bug was in glib, not in indicator-datetime

[Eliah Kagan (degeneracypressure)]

Should a task be added to this bug for glib2.0 in Ubuntu?

[Javier Jardón (jjardon)]

Eliah: branch is already ready for review: https://code.launchpad.net/~dobey/ubuntu/oneiric/glib2.0/fix-804946

Thanks for you interest!