gnome-control-center crashed with SIGSEGV in gnome_rr_config_load_current()

[André Gondim]

I just input a HDMI monitor

[Next Action]
* Determine reproducibility of the bug (and test case)
* [Engineering] Investigate why screens was 0x0 in this case
* [Engineering] Determine if bailing early is the proper way to handle this error condition

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gnome-control-center 1:3.1.3-0ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-5.6-generic 3.0.0-rc7
Uname: Linux 3.0.0-5-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Fri Jul 15 21:55:10 2011
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110705.1)
ProcCmdline: gnome-control-center --overview
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=pt_BR:pt:en
 LANG=pt_BR.UTF-8
SegvAnalysis:
 Segfault happened at: 0xb40b112 <gnome_rr_config_load_current+146>: mov (%eax),%edi
 PC (0x0b40b112) ok
 source "(%eax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%edi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
 gnome_rr_config_load_current () from /usr/lib/libgnome-desktop-3.so.2
 gnome_rr_config_new_current () from /usr/lib/libgnome-desktop-3.so.2
 ?? () from /usr/lib/control-center-1/panels/libdisplay.so
 g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: gnome-control-center crashed with SIGSEGV in gnome_rr_config_load_current()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 gnome_rr_config_load_current (config=0x2130fb28, error=0x0) at gnome-rr-config.c:509
 gnome_rr_config_new_current (screen=0x0, error=0x0) at gnome-rr-config.c:735
 on_screen_changed (scr=0x21195e40, data=0x212d1670) at xrandr-capplet.c:159
 g_cclosure_marshal_VOID__VOID (closure=0x212b6958, return_value=0x0, n_param_values=1, param_values=0x2133ed90, invocation_hint=0xbfe19130, marshal_data=0x0) at /build/buildd/glib2.0-2.29.10/./gobject/gmarshal.c:85
 g_closure_invoke (closure=0x212b6958, return_value=0x0, n_param_values=1, param_values=0x2133ed90, invocation_hint=0xbfe19130) at /build/buildd/glib2.0-2.29.10/./gobject/gclosure.c:773

[Pedro Villavicencio (pedro)]

Thank you for your bug report. This bug has been reported to the developers of the software. You can track it and make comments at:
https://bugzilla.gnome.org/show_bug.cgi?id=655003

[Bryce Harrington (bryce)]

[The Design Team has identified this as a blocker issue for precise, so setting the Importance to Critical. This may be adjusted down once the bug has received further design and engineering analysis, if appropriate.]

[Bryce Harrington (bryce)]

Looks like in the recent refactoring work they forgot to check the rr_outputs pointer before dereferencing it.

Easy enough to check for this situation and bail, but not 100% this is the right way to solve this bug.

The real question is why screens was undefined to begin with.

[Bryce Harrington (bryce)]

Andrè, are you able to reproduce this bug fairly easily? Can you describe the steps that lead to this crash?

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "bail_if_no_screens.patch" of this bug report has been identified as being a patch. The ubuntu-reviewers team has been subscribed to the bug report so that they can review the patch. In the event that this is in fact not a patch you can resolve this situation by removing the tag 'patch' from the bug report and editing the attachment so that it is not flagged as a patch. Additionally, if you are member of the ubuntu-sponsors please also unsubscribe the team from this bug report.

[This is an automated message performed by a Launchpad user owned by Brian Murray. Please contact him regarding any issues with the action taken in this bug report.]

[Bryce Harrington (bryce)]

@Andrè, ping?

[Bryce Harrington (bryce)]

[Expired]