Ubuntu
ubiquity package

Calls Xkl.Engine() gobject constructor which is invalid; needs to use Xkl.Engine.get_instance

Bug #950087 reported by Stéphane Graber
12
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ubiquity (Ubuntu)
Fix Released
High
Stéphane Graber
Precise
Fix Released
High
Stéphane Graber

Bug Description

stgraber@castiana:~/data/code/ubiquity/ubiquity$ python
Python 2.7.2+ (default, Feb 16 2012, 18:47:58)
[GCC 4.6.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from gi.repository import Xkl
>>> test = Xkl.Engine()
Segmentation fault (core dumped)

Mostly annoying as it's blocking the bugfix for bug 800561

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: python2.7-minimal 2.7.2-13ubuntu5
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
ApportVersion: 1.94.1-0ubuntu1
Architecture: amd64
Date: Thu Mar 8 12:04:58 2012
ExecutablePath: /usr/bin/python2.7
ProcCmdline: python
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 LANG=en_US.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7f6446e98bef: movslq 0xe0(%r12),%rax
 PC (0x7f6446e98bef) ok
 source "0xe0(%r12)" (0x000000e0) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: python2.7
StacktraceTop:
 ?? () from /usr/lib/libxklavier.so.16
 g_object_newv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
 ?? ()
Title: python2.7 crashed with SIGSEGV in g_object_newv()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: pkcs11

Related branches

lp:ubuntu/precise/ubiquity
Revision history for this message
Stéphane Graber (stgraber) wrote :
affects: python2.7 (Ubuntu) → libxklavier (Ubuntu)
visibility: private → public
Revision history for this message
Apport retracing service (apport) wrote :

Stacktrace:
 #0 0x00007f6446e98bef in ?? ()
 No symbol table info available.
 #1 0x0000000000000000 in ?? ()
 No symbol table info available.
StacktraceTop:
 ?? ()
 ?? ()

Revision history for this message
Apport retracing service (apport) wrote : ThreadStacktrace.txt
tags: added: apport-failed-retrace
tags: removed: need-amd64-retrace
Stéphane Graber (stgraber)
Changed in libxklavier (Ubuntu):
importance: Undecided → High
assignee: nobody → Canonical Desktop Team (canonical-desktop-team)
Martin Pitt (pitti)
tags: added: rls-p-tracking
Changed in libxklavier (Ubuntu Precise):
status: New → In Progress
assignee: Canonical Desktop Team (canonical-desktop-team) → Martin Pitt (pitti)
Revision history for this message
Martin Pitt (pitti) wrote : Re: python2.7 crashed with SIGSEGV in g_object_newv() when using gi binding for xklavier (gir1.2-xkl-1.0)

This is not a bug. The API does not publicly expose the constructor, i. e. Xkl.Engine.new() does not exist. Xkl.Engine() invokes the GObject constructor on it, which we cannot hide unfortunately.

The API documentation [1] shows that you need to use the singleton function Xkl.Engine.get_instance(display) for this. This works fine, the upstream code has a test script for all this, which you might steal from [2].

[1] http://xlibs.freedesktop.org/xkbdesc/doc/libxklavier-xkl-engine.html#xkl-engine-get-instance
[2] http://cgit.freedesktop.org/libxklavier/tree/tests/test_gi.py

Changed in libxklavier (Ubuntu Precise):
status: In Progress → Triaged
affects: libxklavier (Ubuntu Precise) → ubiquity (Ubuntu Precise)
Changed in ubiquity (Ubuntu Precise):
assignee: Martin Pitt (pitti) → Stéphane Graber (stgraber)
summary: - python2.7 crashed with SIGSEGV in g_object_newv() when using gi binding
- for xklavier (gir1.2-xkl-1.0)
+ Calls Xkl.Engine() gobject constructor which is invalid; needs to use
+ Xkl.Engine.get_instance
Revision history for this message
Stéphane Graber (stgraber) wrote :

Fixed in trunk, thanks Martin for the help.

Changed in ubiquity (Ubuntu Precise):
status: Triaged → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package ubiquity - 2.9.27

---------------
ubiquity (2.9.27) precise; urgency=low

  * Port keyboard indicator from xklavier to Xkl and from gconf to gsettings.
    Update the test accordingly. (LP: #950087, LP: #800561)
  * Add bin/ubiquity-bluetooth-agent, a bluetooth agent allowing any HID
    bluetooth device for 5 minutes, then spawning bluetooth-applet if
    available, otherwise simply dies.
  * Start bluetooth-applet from ubiquity-dm (LP: #644198)
  * Copy /var/lib/bluetooth to /target/var/lib/bluetooth to keep the list
    of trusted devices on the target system. (LP: #644198)
  * Update PO template and translations for new bluetooth string.
  * Automatic update of included source packages: netcfg 1.68ubuntu14,
    partman-auto 93ubuntu20, partman-auto-loop 0ubuntu21.
 -- Stephane Graber <email address hidden> Fri, 09 Mar 2012 12:11:19 -0500

Changed in ubiquity (Ubuntu Precise):
status: Fix Committed → Fix Released
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