Ubuntu
xorg-server package

Xorg crashed with SIGSEGV in DamageUnregister() / VAuditF()

Bug #506977 reported by Kristóf Kiszel on 2010-01-13

This bug affects 8 people

Affects		Status	Importance	Assigned to	Milestone
	xorg-server (Ubuntu)	Fix Released	High	Unassigned

Bug Description

Installation media: latest Lucid mini.iso
Architecture: i386

root@arrakis:~# lsb_release -rd
Description: Ubuntu lucid (development branch)
Release: 10.04

root@arrakis:~# apt-cache policy xserver-xorg
xserver-xorg:
  Installed: 1:7.5+1ubuntu1
  Candidate: 1:7.5+1ubuntu1
  Version table:
*** 1:7.5+1ubuntu1 0
        500 http://hu.archive.ubuntu.com lucid/main Packages
        100 /var/lib/dpkg/status

I started the X server as root from the recovery console, because as normal user I couldn't login. (See https://bugs.launchpad.net/ubuntu/+bug/506902) Then I got a crash report from PolicyKit1-Kde and xserver-xorg.

ProblemType: Crash
Architecture: i386
CrashCounter: 1
Date: Wed Jan 13 11:37:16 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/Xorg
Lsusb:
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: innotek GmbH VirtualBox
Package: xserver-xorg-core 2:1.7.3.902-1ubuntu5
ProcAttrCurrent: unconfined (enforce)
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-10-generic root=UUID=dd20b96a-8496-4fe1-9735-08d8d3489cf1 ro single
ProcCmdline: /usr/bin/X -br -nolisten tcp :0 vt8 -auth /var/run/xauth/A:0-bu0xPc
ProcEnviron:
PATH=(custom, no user)
LANG=hu_HU.UTF-8
ProcVersionSignature: Ubuntu 2.6.32-10.14-generic
RelatedPackageVersions:
xserver-xorg 1:7.5+1ubuntu1
libgl1-mesa-glx 7.7-0ubuntu4
libdrm2 2.4.17-0ubuntu1
xserver-xorg-video-intel 2:2.9.1-1ubuntu1
xserver-xorg-video-ati 1:6.12.99+git20091125.0061c4db-0ubuntu2
SegvAnalysis:
Segfault happened at: 0x1bf0f7 <strchrnul+23>: mov (%eax),%cl
PC (0x001bf0f7) ok
source "(%eax)" (0x0000000b) not located in a known VMA region (needed readable region)!
destination "%cl" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
DamageUnregister ()
shadowRemove () from /usr/lib/xorg/modules/libshadow.so
?? () from /usr/lib/xorg/modules/libshadow.so
?? ()
?? ()
Tags: lucid
Title: Xorg crashed with SIGSEGV in DamageUnregister()
Uname: Linux 2.6.32-10-generic i686
UserGroups:

XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH
fglrx: Not loaded
glxinfo: Error: [Errno 2] No such file or directory
system:
distro: Ubuntu
architecture: i686kernel: 2.6.32-10-generic

Tags:

Related branches

lp:ubuntu/lucid/xorg-server

Revision history for this message

Kristóf Kiszel (ulysses) wrote on 2010-01-13:

BootDmesg.txt Edit (23.2 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (17.7 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (3.5 KiB, text/plain; charset="utf-8")
Disassembly.txt Edit (741 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (4.8 KiB, text/plain; charset="utf-8")
PciDisplay.txt Edit (425 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (548 bytes, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.1 KiB, text/plain; charset="utf-8")
ProcMaps.txt Edit (9.0 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (1.6 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (715 bytes, text/plain; charset="utf-8")
Registers.txt Edit (499 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (1.7 KiB, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (1.7 KiB, text/plain; charset="utf-8")
UdevDb.txt Edit (59.9 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (132.8 KiB, text/plain; charset="utf-8")
XorgLog.txt Edit (40.9 KiB, text/plain; charset="utf-8")
XorgLogOld.txt Edit (42.8 KiB, text/plain; charset="utf-8")
Xrandr.txt Edit (756 bytes, text/plain; charset="utf-8")
setxkbmap.txt Edit (253 bytes, text/plain; charset="utf-8")
xdpyinfo.txt Edit (17.2 KiB, text/plain; charset="utf-8")
xkbcomp.txt Edit (44.1 KiB, text/plain; charset="utf-8")

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-13:

StacktraceTop:
DamageUnregister ()
shadowRemove () from /usr/lib/xorg/modules/libshadow.so
?? () from /usr/lib/xorg/modules/libshadow.so
?? ()
?? ()

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-13: Stacktrace.txt

Stacktrace.txt Edit (4.2 KiB, text/plain)

Revision history for this message

Apport retracing service (apport) wrote on 2010-01-13: ThreadStacktrace.txt

ThreadStacktrace.txt Edit (4.2 KiB, text/plain)

tags:	added: apport-failed-retrace
tags:	removed: need-i386-retrace

Ubuntu QA Website (ubuntuqa) on 2010-01-13

tags:

added: iso-testing

Bryce Harrington (bryce) on 2010-01-15

visibility:

private → public

Bryce Harrington (bryce) on 2010-01-15

summary:

- Xorg crashed with SIGSEGV in DamageUnregister()
+ Xorg crashed with SIGSEGV in DamageUnregister() / VAuditF()

Revision history for this message

Bryce Harrington (bryce) wrote on 2010-01-15:

I'm not 100% certain, but this bug report looks a heck of a lot like bug #506510, and I think it shares the same root cause. The problem is that error messages were being written to the log after the log file was closed, which causes a segfault in the signal handling code.

I've corrected the specific error message print which causes 506510, and am going to assume that covers this crash as well. Because of the signal handling logic, it hides the clues I'd need to be absolutely certain that fix fixes this one as well. So please test version xorg-server 2:1.7.3.902-1ubuntu7, and if you still get a crash please reopen this bug (or file a new bug, esp. if apport captures it, and reference this bug report so we know the background).

Changed in xorg-server (Ubuntu):
importance:	Undecided → High
status:	New → In Progress

Revision history for this message

Launchpad Janitor (janitor) wrote on 2010-01-16:

This bug was fixed in the package xorg-server - 2:1.7.3.902-1ubuntu7

---------------
xorg-server (2:1.7.3.902-1ubuntu7) lucid; urgency=low

  * Update 100_rethrow_signals.patch: Don't log more error messages after
    the log has been closed, else it causes a SIGSEGV (signal 11) crash
    under several different conditions, including on even ordinary error
    exits.
    (LP: #506510, #507345, #506977, #504497, #507083)
-- Bryce Harrington <email address hidden> Fri, 15 Jan 2010 15:22:34 -0800

Changed in xorg-server (Ubuntu):
status:	In Progress → Fix Released

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Xorg crashed with SIGSEGV in DamageUnregister() / VAuditF()

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xorg-server package