[Bug 1802961] [NEW] sddm crashed with SIGABRT in qt_message_fatal()

[Olivier Hallot]

Public bug reported:

Cannot open a VT2, sddm crashes

***@olivier-ntbk:/var/crash# lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04


***@olivier-ntbk:/var/crash# apt-cache policy sddm
sddm:
Instalado: 0.17.0-1ubuntu7
Candidato: 0.17.0-1ubuntu7
Tabela de versão:
*** 0.17.0-1ubuntu7 500
500 http://br.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
100 /var/lib/dpkg/status

Expected results: open a new session with different user in VT2, keep VT1 with current user, switch between VT1 and VT2 with Ctrl+alt+F1 and Ctrl+Alt+F2.
Actually cannot open more than one user, it should let me open VT2, Vt3... VTn.

What happened instead: sddm crashes, Xorg restart on VT1, previous
session is killed, all unsaved data is lost.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: sddm 0.17.0-1ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CrashCounter: 1
Date: Mon Nov 12 15:06:27 2018
ExecutablePath: /usr/bin/sddm
ExecutableTimestamp: 1524229926
InstallationDate: Installed on 2018-05-10 (185 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcCmdline: /usr/bin/sddm
ProcCwd: /
ProcEnviron:
LANG=pt_BR.UTF-8
LANGUAGE=pt_BR:pt:en
PATH=(custom, no user)
Signal: 6
SourcePackage: sddm
StacktraceTop:
QMessageLogger::fatal(char const*, ...) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
SDDM::Display::start() ()
SDDM::Seat::createDisplay(int) ()
?? ()
SeatAdaptor::qt_metacall(QMetaObject::Call, int, void**) ()
Title: sddm crashed with SIGABRT in QMessageLogger::fatal()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

** Affects: sddm (Ubuntu)
Importance: Medium
Status: New


** Tags: amd64 apport-crash bionic

** Information type changed from Private to Public
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https://bugs.launchpad.net/bugs/1802961

Title:
sddm crashed with SIGABRT in qt_message_fatal()

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[Apport retracing service]

StacktraceTop:
qt_message_fatal (context=..., message=<synthetic pointer>...) at global/qlogging.cpp:1690
QMessageLogger::fatal (this=***@entry=0x7ffe8f77b4c0, msg=***@entry=0x55d5aacdcdf0 "Display server failed to start. Exiting") at global/qlogging.cpp:796
SDDM::Display::start (this=***@entry=0x55d5ab686620) at ./src/daemon/Display.cpp:112
SDDM::Seat::createDisplay (this=0x55d5ab6815b0, terminalId=2) at ./src/daemon/Seat.cpp:81
SeatAdaptor::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at ./obj-x86_64-linux-gnu/src/daemon/seatadaptor.moc:116
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https://bugs.launchpad.net/bugs/1802961

Title:
sddm crashed with SIGABRT in qt_message_fatal()

To manage notifications about this bug go to:
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[Apport retracing service]

** Attachment added: "Stacktrace.txt"
https://bugs.launchpad.net/bugs/1802961/+attachment/5211969/+files/Stacktrace.txt
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You received this bug notification because you are a member of Kubuntu
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https://bugs.launchpad.net/bugs/1802961

Title:
sddm crashed with SIGABRT in qt_message_fatal()

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1802961/+subscriptions

[Apport retracing service]

** Attachment added: "StacktraceSource.txt"
https://bugs.launchpad.net/bugs/1802961/+attachment/5211970/+files/StacktraceSource.txt
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You received this bug notification because you are a member of Kubuntu
Bugs, which is subscribed to sddm in Ubuntu.
https://bugs.launchpad.net/bugs/1802961

Title:
sddm crashed with SIGABRT in qt_message_fatal()

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1802961/+subscriptions

[Apport retracing service]

** Attachment added: "ThreadStacktrace.txt"
https://bugs.launchpad.net/bugs/1802961/+attachment/5211971/+files/ThreadStacktrace.txt

** Attachment removed: "CoreDump.gz"
https://bugs.launchpad.net/bugs/1802961/+attachment/5211959/+files/CoreDump.gz

** Changed in: sddm (Ubuntu)
Importance: Undecided => Medium

** Summary changed:

- sddm crashed with SIGABRT in QMessageLogger::fatal()
+ sddm crashed with SIGABRT in qt_message_fatal()

** Tags removed: need-amd64-retrace
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You received this bug notification because you are a member of Kubuntu
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https://bugs.launchpad.net/bugs/1802961

Title:
sddm crashed with SIGABRT in qt_message_fatal()

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1802961/+subscriptions