gdm-simple-chooser segfault in libX11.so.6.3.0

[orondo jones]

(1) lsb_release-rd output
==============================
Description: Ubuntu 18.04 LTS
Release: 18.04

(2) apt-cache-policy output
==============================gdm3:
  Installed: 3.28.0-0ubuntu1
  Candidate: 3.28.0-0ubuntu1
  Version table:
 *** 3.28.0-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

(3) I expected to be able login using X

(4) What happened:
Looking in syslog, I see the following message:
May 22 16:47:33 Paradise kernel: [ 5793.249149] gdm-simple-choo[25864]: segfault at 1 ip 00007fb0267de4b9 sp 00007fff46d5e0d0 error 6 in libX11.so.6.3.0[7fb0267b6000+134000]

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. However, your bug report is missing crash details. In order to debug a crash we will need a crash report. To create one, please follow these steps:

1. If you are not running a future development release of Ubuntu then apply the workaround from bug 994921.
2. If you are running the Ubuntu Stable Release you might need to enable apport in /etc/default/apport.
3. If the crash is in Xorg then uncomment this option from /etc/gdm3/custom.conf:
   # Additionally lets the X server dump core if it crashes
   #Enable=true
4. Reboot.
5. Reproduce the crash.
6. Look in /var/crash for crash files and when found, run:
   ubuntu-bug /var/crash/YOURFILE.crash
7. Add a comment here telling us the ID of the new bug that was created in step 6.

Please take care to avoid attaching .crash files to bugs as we are unable to process them as file attachments, and doing so is also a security risk for yourself.

[orondo jones (ojones)]

I can run the ubuntu-bug program but it indicates that I am to fill out a form in my web browser. The problem is that I can't get a graphical interface even at the console so I cannot complete the form. I did run ubuntu-bug. The following is what I see when I choose the view report option.

*** Collecting problem information

The collected information can be sent to the developers to improve the
application. This might take a few minutes.
................................
*** The crashed program seems to use third-party or local libraries:

/usr/local/lib/libz.so.1.2.11

It is highly recommended to check if the problem persists without those first.

Do you want to continue the report process anyway?

What would you like to do? Your options are:
  Y: Yes
  N: No
  C: Cancel

[orondo jones (ojones)]

I think the following is what you may want. I removed the version of libz that I compiled in /usr/local/lib and I am using the version that comes with ubuntu. I still get the same error in syslog.

===============================

*** Send problem report to the developers?

After the problem report has been sent, please fill out the form in the
automatically opened web browser.

What would you like to do? Your options are:
  S: Send report (892.1 KB)
  V: View report
  K: Keep report file for sending later or copying to somewhere else
  I: Cancel and ignore future crashes of this program version
  C: Cancel
Please choose (S/V/K/I/C): == ApportVersion =================================
2.20.9-0ubuntu7

== Architecture =================================
amd64

== CoreDump =================================
(28344320 bytes)

== CurrentDesktop =================================
GNOME-Greeter:GNOME

== Date =================================
Wed May 23 12:56:51 2018

== Dependencies =================================
accountsservice 0.6.45-1ubuntu1
acl 2.2.52-3build1
adduser 3.116ubuntu1
adwaita-icon-theme 3.28.0-1ubuntu1
adwaita-icon-theme-full 3.28.0-1ubuntu1
apg 2.2.3.dfsg.1-5
apparmor 2.12-4ubuntu5
apport 2.20.9-0ubuntu7
apport-symptoms 0.20
apt 1.6.1
apt-utils 1.6.1
aptdaemon 1.1.1+bzr982-0ubuntu19
aptdaemon-data 1.1.1+bzr982-0ubuntu19
aspell 0.60.7~20110707-4
aspell-en 2017.08.24-0-0.1
at-spi2-core 2.28.0-1
avahi-daemon 0.7-3.1ubuntu1
base-files 10.1ubuntu2
bash 4.4.18-2ubuntu1
bash-completion 1:2.8-1ubuntu1
bind9-host 1:9.11.3+dfsg-1ubuntu1
binutils 2.30-15ubuntu1
binutils-common 2.30-15ubuntu1
binutils-x86-64-linux-gnu 2.30-15ubuntu1
bluez 5.48-0ubuntu3
bolt 0.2-0ubuntu1
bsdmainutils 11.1.2ubuntu1
bsdutils 1:2.31.1-0.4ubuntu3
bzip2 1.0.6-8.1
ca-certificates 20180409
cheese-common 3.28.0-1ubuntu1
colord 1.3.3-2build1
colord-data 1.3.3-2build1
coreutils 8.28-1ubuntu1
cpp 4:7.3.0-3ubuntu2
cpp-7 7.3.0-16ubuntu3
cracklib-runtime 2.9.2-5build1
crda 3.18-1build1
cups-pk-helper 0.2.6-1ubuntu1
curl 7.58.0-2ubuntu3.1
dbus 1.12.2-1ubuntu1
dbus-user-session 1.12.2-1ubuntu1
dbus-x11 1.12.2-1ubuntu1
dconf-cli 0.26.0-2ubuntu3
dconf-gsettings-backend 0.26.0-2ubuntu3
dconf-service 0.26.0-2ubuntu3
debconf 1.5.66
debconf-i18n 1.5.66
debianutils 4.8.4
desktop-file-utils 0.23-1ubuntu3
dictionaries-common 1.27.2
diffstat 1.61-1build1
dirmngr 2.2.4-1ubuntu1
distro-info-data 0.37ubuntu0.1
dmsetup 2:1.02.145-4.1ubuntu3
dns-root-data 2018013001
dnsmasq-base 2.79-1
dpkg 1.19.0.5ubuntu2
emacsen-common 2.0.8
enchant 1.6.0-11.1
evolution-data-server 3.28.1-1ubuntu1
evolution-data-server-common 3.28.1-1ubuntu1
fdisk 2.31.1-0.4ubuntu3
file 1:5.32-2
fontconfig 2.12.6-0ubuntu2
fontconfig-config 2.12.6-0ubuntu2
fonts-cantarell 0.0.25-4
fonts-dejavu-core 2.37-1
fonts-ubuntu 0.83-2
gcc-7-base 7.3.0-16ubuntu3
gcc-8-base 8-20180414-1ubuntu2
gcr 3.28.0-1
geoclue-2.0 2.4.7-1ubuntu1
geoip-database 20180315-1
gettext 0.19.8.1-6
gettext-base 0.19.8.1-6
gir1.2-accountsservice-1.0 0.6.45-1ubuntu1
gir1.2-atk-1.0 2.28.1-1
gir1.2-atspi-2.0 2.28.0-1
gir1.2-freedesktop 1.56.1-1
gir1.2-gck-1 3.28.0-1
gir1.2-gcr-3 3.28.0-1
gir1.2-gdesktopenums-3.0 3.28.0-1ubuntu1
gir1.2-gdkpixbuf-2.0 2.36.11-2
g...

[orondo jones (ojones)]

Sorry about the previous comment, I didn't know the output would be truncated. I have attached the output from ubuntu-bug.

[Daniel van Vugt (vanvugt)]

We will need a new bug to be created by that command. You will need to hit 'S' at the end to send the crash report and then it will tell you a web URL. You don't need to have a GUI at the time - just copy the URL and open it on a different machine to complete the bug report process.

When done, please let us know the new bug ID.

[orondo jones (ojones)]

The new bug ID is: Bug #1773159
Ignore the comment in the Note section about not getting a new bug id. I thought I would get the new bug ID after running ubuntu-bug.

[Daniel van Vugt (vanvugt)]

Great, thanks. Conversation continues in bug 1773159.