Ubuntu
gnome-settings-daemon package

gnome-settings-daemon crashed with SIGSEGV in cairo_set_source_surface()

Bug #661283 reported by Matt Zimmerman on 2010-10-15

This bug affects 5 people

Affects		Status	Importance	Assigned to	Milestone
	gnome-settings-daemon (Ubuntu)	Fix Released	Medium	Robert Ancell

Bug Description

Binary package hint: gnome-settings-daemon

This is a different system from my bug 660063, which is also a gnome-settings-daemon crash

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: gnome-settings-daemon 2.32.0-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-22.34-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Fri Oct 15 11:36:19 2010
EcryptfsInUse: Yes
ExecutablePath: /usr/lib/gnome-settings-daemon/gnome-settings-daemon
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Alpha i386 (20100315)
ProcCmdline: /usr/lib/gnome-settings-daemon/gnome-settings-daemon
ProcEnviron:
PATH=(custom, user)
LANG=en_GB.utf8
SHELL=/bin/zsh
SegvAnalysis:
Segfault happened at: 0xb78b96 <cairo_set_source_surface+38>: mov 0x4(%esi),%ecx
PC (0x00b78b96) ok
source "0x4(%esi)" (0x00000004) not located in a known VMA region (needed readable region)!
destination "%ecx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-settings-daemon
StacktraceTop:
cairo_set_source_surface () from /usr/lib/libcairo.so.2
gdk_cairo_set_source_pixbuf () from /usr/lib/libgdk-x11-2.0.so.0
gnome_bg_create_pixmap () from /usr/lib/libgnome-desktop-2.so.17
?? () from /usr/lib/gnome-settings-daemon-2.0/libbackground.so
g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
Title: gnome-settings-daemon crashed with SIGSEGV in cairo_set_source_surface()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

Tags:

Related branches

lp:~ubuntu-desktop/gnome-desktop/ubuntu

lp:ubuntu/natty/gnome-desktop

Revision history for this message

Matt Zimmerman (mdz) wrote on 2010-10-15:

Dependencies.txt Edit (5.1 KiB, text/plain; charset="utf-8")
Disassembly.txt Edit (1.0 KiB, text/plain; charset="utf-8")
ProcMaps.txt Edit (33.9 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (784 bytes, text/plain; charset="utf-8")
Registers.txt Edit (475 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (1.7 KiB, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (2.5 KiB, text/plain; charset="utf-8")
XsessionErrors.txt Edit (7.9 KiB, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2010-10-15:

StacktraceTop:
*INT_cairo_set_source_surface (cr=0x0, surface=0x83f6800, x=0, y=0)
IA__gdk_cairo_set_source_pixbuf (cr=0x0, pixbuf=0x82d6848,
gnome_bg_create_pixmap (bg=0x82a7818, window=0x822c050,
draw_background (manager=<value optimized out>,
g_cclosure_marshal_VOID__VOID ()

Revision history for this message

Apport retracing service (apport) wrote on 2010-10-15: Stacktrace.txt

Stacktrace.txt Edit (9.6 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2010-10-15: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (10.5 KiB, text/plain)

Changed in gnome-settings-daemon (Ubuntu):
importance:	Undecided → Medium
tags:	removed: need-i386-retrace

Matt Zimmerman (mdz) on 2010-10-15

visibility:

private → public

Revision history for this message

Martin Pitt (pitti) wrote on 2010-12-03:

Robert, do you have some time to look into this? Looks like it's stumbling over the NULL pointer here, so I guess some allocation failed earlier on?

Rick Spencer (rick-rickspencer3) on 2010-12-20

Changed in gnome-settings-daemon (Ubuntu):
assignee:	nobody → Robert Ancell (robert-ancell)

Revision history for this message

Robert Ancell (robert-ancell) wrote on 2010-12-20:

Matt, how reproducible is this? What steps can I take to reproduce it?

Looking through the stack trace shows:
- The Cairo context is NULL
- This only seems possible if the background pixmap is NULL
- The background pixmap only seems to be able to be NULL if a connection to the X server was not possible (in gnome-desktop-2.32.1/libgnome-desktop/gnome-bg.c:make_root_pixmap()).

These event should have triggered some g_warnings, which I would have expected to show in ~/.xsession-errors and maybe /var/log/Xorg.0.log.

Matt, could you reproduce and attach the above two logs?

Revision history for this message

Matt Zimmerman (mdz) wrote on 2010-12-21:

I've had gnome-settings-daemon continue to crash on me regularly in 10.10 (bug 685785), but haven't seen this particular trace recur and I don't have any way to reproduce it. I filed this over two months ago, so to be honest I'm having trouble remembering the exact circumstances which surrounded the crash.

It looks as if another possible NULL return is if gdk_pixmap_foreign_new_for_screen fails. In any case, someone should be checking for an error return and not dereferencing the null pointer, right?

I'm surprised that ~/.xsession-errors wasn't automatically attached by apport; if it's routinely useful for diagnosing crashes like this one, that should probably be changed.

Revision history for this message

Robert Ancell (robert-ancell) wrote on 2010-12-23:

There was an attached log but it didn't contain anything useful. It might have been from the session after the crash however.

Revision history for this message

Robert Ancell (robert-ancell) wrote on 2011-01-07:

Was fixed in gnome-desktop 2.32.1-0ubuntu2

Changed in gnome-settings-daemon (Ubuntu):
status:	New → Fix Released

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gnome-settings-daemon crashed with SIGSEGV in cairo_set_source_surface()

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Ubuntu
gnome-settings-daemon package