qmlscene crashed with SIGSEGV in QmlIR::QmlUnitGenerator::generate()

[James Hunt]

Running a project I hadn't touched in a while [1] caused the crash. However a basic "hello world" QML file [2] is fine.

[1] - https://github.com/jamesodhunt/qml-noughts-and-crosses
[2] - http://qt-project.org/doc/qt-5/qmlfirststeps.html

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: qmlscene 5.3.0-3ubuntu6
ProcVersionSignature: Ubuntu 3.15.0-6.11-generic 3.15.0
Uname: Linux 3.15.0-6-generic x86_64
ApportVersion: 2.14.4-0ubuntu1
Architecture: amd64
CrashCounter: 1
CurrentDesktop: Unity
Date: Thu Jul 3 09:30:26 2014
ExecutablePath: /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene
InstallationDate: Installed on 2014-04-11 (82 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140409)
ProcCmdline: /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene -I /home/username/src/qml/qml-noughts-and-crosses -I /usr/bin -I /usr/lib/i386-linux-gnu/qt5/qml /home/username/src/qml/qml-noughts-and-crosses/noughts-and-crosses.qml
SegvAnalysis:
 Segfault happened at: 0x7ff039273c89 <_ZN5QmlIR16QmlUnitGenerator8generateERNS_8DocumentE+41>: mov (%rax),%rax
 PC (0x7ff039273c89) ok
 source "(%rax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: qtdeclarative-opensource-src
StacktraceTop:
 QmlIR::QmlUnitGenerator::generate(QmlIR::Document&) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
 ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
Title: qmlscene crashed with SIGSEGV in QmlIR::QmlUnitGenerator::generate()
UpgradeStatus: Upgraded to utopic on 2014-05-08 (55 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sbuild sudo

[Apport retracing service (apport)]

StacktraceTop:
 QmlIR::QmlUnitGenerator::generate (this=this@entry=0x7ff005ee6d50, output=...) at compiler/qqmlirbuilder.cpp:1515
 QQmlScriptBlob::dataReceived (this=0x7ff0001386d0, data=...) at qml/qqmltypeloader.cpp:2711
 QQmlDataLoader::setData (this=this@entry=0xf78270, blob=blob@entry=0x7ff0001386d0, d=...) at qml/qqmltypeloader.cpp:1198
 QQmlDataLoader::setData (this=this@entry=0xf78270, blob=blob@entry=0x7ff0001386d0, file=file@entry=0x7ff005ee6fd0) at qml/qqmltypeloader.cpp:1190
 QQmlDataLoader::loadThread (this=this@entry=0xf78270, blob=blob@entry=0x7ff0001386d0) at qml/qqmltypeloader.cpp:1068

[Timo Jyrinki (timo-jyrinki)]

I can confirm a crash trying to run qml Game.qml.

[Timo Jyrinki (timo-jyrinki)]

And also with Qt 5.3.1.

It would be nice if there would be a smaller test case, something to submit to upstream bug reporting tool at: https://bugreports.qt-project.org/

More specifically, if one could make something that doesn't require Ubuntu.Components but still produces the crash, since that may not necessarily be easily available for Qt project developers.

[Launchpad Janitor (janitor)]

[Expired for qtdeclarative-opensource-src (Ubuntu) because there has been no activity for 60 days.]

[Timo Jyrinki (timo-jyrinki)]

Instead of expiring, this would be a useful bug to keep around since it has a test case. We'd just need a simpler test case to show to the upstream.

Confirmed happening with qtdeclarative-opensource-src 5.3.2-3ubuntu2 in vivid.

[Timo Jyrinki (timo-jyrinki)]

The game keeps on crashing on startup on Qt 5.4.1 too...

[Timo Jyrinki (timo-jyrinki)]

Wow, works on Ubuntu 16.04 LTS on Qt 5.5.1, finally! :)