gdm-session-worker assert failure: *** Error in `gdm-session-worker [pam/gdm-password]': free(): invalid pointer: 0x0000000002223b20 ***

[cariboo]

I'm running Ubuntu Gnome in Virtualbox, after todays update, I get this error

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: gdm 3.12.2-0ubuntu1~utopic2 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 3.16.0-14.20-generic 3.16.2
Uname: Linux 3.16.0-10-generic x86_64
ApportVersion: 2.14.7-0ubuntu2
Architecture: amd64
AssertionMessage: *** Error in `gdm-session-worker [pam/gdm-password]': free(): invalid pointer: 0x0000000002223b20 ***
Date: Tue Sep 16 12:53:34 2014
ExecutablePath: /usr/lib/gdm/gdm-session-worker
InstallationDate: Installed on 2014-05-11 (128 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140510)
ProcCmdline: gdm-session-worker\ [pam/gdm-password]
ProcEnviron:
 LANG=en_CA.UTF-8
 TERM=linux
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
Signal: 6
SourcePackage: gdm
StacktraceTop:
 __GI___isnan (x=-nan(0xfffff00000000)) at ../sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c:28
 __GI_sigfillset (set=0x917) at ../signal/sigfillset.c:33
 ?? ()
 ?? ()
Title: gdm-session-worker assert failure: *** Error in `gdm-session-worker [pam/gdm-password]': free(): invalid pointer: 0x0000000002223b20 ***
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

mtime.conffile..etc.gdm.custom.conf: 2014-07-22T09:26:52.981240

[Ubuntu GNOME (ug-bot)]

StacktraceTop:
 __GI___isnan (x=-nan(0xfffff00000000)) at ../sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c:28
 __GI_sigfillset (set=0x917) at ../signal/sigfillset.c:33
 ?? ()
 ?? ()