signonpluginprocess crashed with SIGSEGV in QString::append()

[Achim Behrens]

fully uptodate 13.10
upgraded yesterday from 13.04 and had problems to login, the dsktop crashed several times

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: signond 8.52daily13.06.18-0ubuntu1
ProcVersionSignature: Ubuntu 3.9.0-7.15-generic 3.9.7
Uname: Linux 3.9.0-7-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.10.2-0ubuntu2
Architecture: amd64
Date: Sun Jun 23 03:58:37 2013
ExecutablePath: /usr/bin/signonpluginprocess
InstallationDate: Installed on 2011-10-29 (603 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
ProcCmdline: /usr/bin/signonpluginprocess oauth2
SegvAnalysis:
 Segfault happened at: 0x7f74fa4a4d60: mov -0x14(%rsi),%r11
 PC (0x7f74fa4a4d60) ok
 source "-0x14(%rsi)" (0x0167179a) not located in a known VMA region (needed readable region)!
 destination "%r11" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: signon
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libc.so.6
 QString::append(QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QTextStream::operator<<(QString const&) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
 QtMetaTypePrivate::QMetaTypeFunctionHelper<SignOn::UiSessionData, true>::Create(void const*) () from /usr/lib/signon/liboauth2plugin.so
 ?? ()
Title: signonpluginprocess crashed with SIGSEGV in QString::append()
UpgradeStatus: Upgraded to saucy on 2013-06-23 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1188477, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.