GNOME Tweak Tool crashes when enabling 'Activities configurator' extension [gnome-tweak-tool crashed with SIGSEGV in sem_post()]

[Elias Psallidas]

GNOME Tweak Tool crashes when enabling the 'Activities configurator' extension in Ubuntu GNOME 13.10, using GNOME 3.10.1, installed from the following PPAs:
   - https://launchpad.net/~gnome3-team/+archive/gnome3-staging
   - https://launchpad.net/~gnome3-team/+archive/gnome3-next

This problem is probably caused as a result of the bug #1236749 . After every reboot all pre-enabled GNOME Shell extensions are disabled, so one must enable them manually at every startup (if not using the workarounds).

Having installed a number of extensions including the 'Activities Configurator', every time I try to enable the installed extensions after a reboot using gnome-tweak-tool, it crashes when I turn the 'Activities Configurator' ON. This doesn't happen with any other extention, but the Activities Configurator. The 'Activities Configurator' turns ON normally as it should, but gnome-tweak-tool crashes instantly afterwards.

The strange thing is that the crash occurs only the first time I try to enable this extension. After gnome-tweak-tool crashes I launch it again and turn the 'Activities Configurator' ON & OFF (enabling/disabling multiple times) and gnome-tweak-tool doesn't crash, but works as it supposed to.

How to reproduce:
   1) In Ubuntu GNOME add the above PPAs to the Software Sources.
   2) Update and upgrade using: sudo apt-get update && sudo apt-get dist-upgrade
   3) After rebooting install the Activities Configurator extension from https://extensions.gnome.org/
   4) Reboot - The extension(s) now should be disabled because of bug #1236749.
   5) Launch gnome-tweak-tool and turn on the 'Activities Configurator' extension.

What happens:
   1) The extension turns ON, as it should.
   2) gnome-tweak-tool crashes (that's the problem)

What should happen:
   1) gnome-tweak-tool should stay open and functional after enabling the extension.

I repeat that this happens only the first time that I enable the extension after a reboot. If I disable it and re-enable it during the same session, gnome-tweak-tool won't crash.

The information collected by apport are attached to the report.

Thanks.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: gnome-tweak-tool 3.10.0-0ubuntu1~saucy1 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CrashCounter: 1
Date: Fri Nov 1 22:49:34 2013
ExecutablePath: /usr/bin/gnome-tweak-tool
InstallationDate: Installed on 2013-10-17 (15 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Release amd64 (20131017)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gnome-tweak-tool
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f3c108341c0 <sem_post>: mov (%rdi),%eax
 PC (0x7f3c108341c0) ok
 source "(%rdi)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-tweak-tool
StacktraceTop:
 sem_post () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S:33
 PyThread_release_lock ()
 g_object_ref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 g_settings_backend_changed () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
Title: gnome-tweak-tool crashed with SIGSEGV in sem_post()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo

[Launchpad Janitor (janitor)]

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

[Elias Psallidas (eliasps)]

This didn't happen on the last two reboots.
Tweak Tool worked properly.
I update my system regularly.
Did something change?

[obarisk (royobarisk)]

ubuntu gnome 13.10
3.10.1-0ubuntu1~saucy1 0 gnome3-staging without bug

[Bruce Pieterse (octoquad)]

This doesn't seem to be a problem any more in Vivid. Bug #1236749 (parent bug #1385572) was fixed which fixes extensions from being disabled every time after rebooting.

Activities configuration is now enabled and working after a reboot.

Saucy is also now EOL.