gnome-tweak-tool crashed with SIGSEGV in sem_post@@GLIBC_2.1()

[john h]

Crashes all the time. Usually after a few minutes.

You can reproduce the crash by changing keys entries in dconf-editor or installing extensions from the web interface while gnome-tweak-tool is running.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: gnome-tweak-tool 3.8.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-7.13-generic 3.11.0
Uname: Linux 3.11.0-7-generic i686
ApportVersion: 2.12.4-0ubuntu1
Architecture: i386
Date: Sat Sep 21 13:26:36 2013
ExecutablePath: /usr/bin/gnome-tweak-tool
InstallationDate: Installed on 2013-07-25 (58 days ago)
InstallationMedia: Ubuntu-GNOME 13.10 "Saucy Salamander" - Alpha i386 (20130626)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gnome-tweak-tool
SegvAnalysis:
 Segfault happened at: 0xb7757e15 <sem_post@@GLIBC_2.1+5>: mov (%ebx),%eax
 PC (0xb7757e15) ok
 source "(%ebx)" (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@@GLIBC_2.1 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/sem_post.S:41
 PyThread_release_lock ()
 PyEval_ReleaseLock ()
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gobject/_gobject.so
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: gnome-tweak-tool crashed with SIGSEGV in sem_post@@GLIBC_2.1()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm lpadmin sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 sem_post@@GLIBC_2.1 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/sem_post.S:41
 PyThread_release_lock (lock=0x0) at ../Python/thread_pthread.h:350
 PyEval_ReleaseLock () at ../Python/ceval.c:265
 pyg_toggle_notify (data=data@entry=0x9167c5c, object=object@entry=0x94aefd0, is_last_ref=is_last_ref@entry=0) at ../../../gi/_gobject/pygobject.c:605
 toggle_refs_notify (object=<optimized out>, is_last_ref=0) at /build/buildd/glib2.0-2.37.93/./gobject/gobject.c:2906

[Launchpad Janitor (janitor)]

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

[Romano Giannetti (romano-giannetti)]

In bug #1245304 you can find a stacktrace (from @szx) and a way to reproduce it easily... I copy that here:

To reproduce the bug, do the following:

1) open gnome-tweak-tool and don't do anything with it
2) open dconf-editor
3) go to org.gnome.desktop.wm.preferences
4) change the value of a key (for example, click on titlebar-use-system-font

-> gnome-tweak-tool crashes immediately.

[Lockal (lockal)]

Another way to reproduce (from bug #1235902):
1) Open gnome-tweak-tool on extensions tab
2) Go to https://extensions.gnome.org/ and enable any extension there (gnome-tweak-tool should be opened)

[Romano Giannetti (romano-giannetti)]

Any new on this bug? Makes almost impossible to use gnome-tweak-tools...

[Romano Giannetti (romano-giannetti)]

I suspect the upstream is https://bugzilla.gnome.org/show_bug.cgi?id=710530. Asked there, will check back.

[Romano Giannetti (romano-giannetti)]

Seems the same, and it seems fixed upstream. The problem is that I tested he fix (and the workaround) and it doesn't run on 13.10 --- it needs to be backported by someone with more knowledge than me.

[Romano Giannetti (romano-giannetti)]

I had found the patch that fix the crash --- it's here. https://git.gnome.org/browse/gnome-tweak-tool/commit/?h=gnome-3-10&id=757c4e1eb06031cf1d066047a8032dc071a8843c.

It applies (almost) cleanly to the Ubuntu 3.10 version and works for me; at least you can use g-t-t with it.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Backported patch from 3.10 upstream branch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Romano Giannetti (romano-giannetti)]

Just adding that the patched gnome-tweak-tool (see post #12) is working for me with no problem since more than one month. The patch seems safe, too, and easily applied by hand.

[Romano Giannetti (romano-giannetti)]

Anything new here? I do not know if it has been shipped...

[Jeremy Bícha (jbicha)]

This bug was fixed in gnome-tweak-tool 3.10, available in Ubuntu 14.04 LTS.