App goes in core dump if the physics = true is istantiated at startup in heavy scenes

rpadovani commented

2015-06-30 18:25:34 +00:00

(Migrated from github.com)

In very heavy scenes (sorry, not able to provide a useful code right now) if physics: true the app produces a core dump.

The same code works if I use Component.onCompleted: physics = true.

Here the backtrack:

Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fc3f68d7230 in QList<ContactEvent>::QList(QList<ContactEvent> const&) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
(gdb) bt
#0  0x00007fc3f68d7230 in QList<ContactEvent>::QList(QList<ContactEvent> const&) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#1  0x00007fc3f68d7013 in Box2DWorld::SayGoodbye(b2Fixture*) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#2  0x00007fc3f68bf851 in b2World::DestroyBody(b2Body*) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#3  0x00007fc3f68d8f2d in Box2DBody::setWorld(Box2DWorld*) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#4  0x00007fc3f68f5f3c in Box2DBody::qt_metacall(QMetaObject::Call, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#5  0x00007fc40e526944 in QQmlVMEMetaObject::metaCall(QMetaObject::Call, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fc40e541b7f in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fc40e5435fb in QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fc40e543d31 in QQmlPropertyPrivate::writeBinding(QObject*, QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*, QV4::ValueRef, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fc40e5b851c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007fc40e5b8c7e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007fc40e592497 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007fc40e52f10c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007fc40f324141 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fc3f68e238b in Scene::initializeEntities(QQuickItem*) ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#15 0x00007fc3f68e2604 in Scene::componentComplete() ()
   from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so
#16 0x00007fc40e5c19c7 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007fc40e545bab in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00007fc40e545c67 in QQmlComponentPrivate::completeCreate() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007fc40e547d70 in QQmlComponent::create(QQmlContext*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007fc40fcf51ab in QQuickView::continueExecute() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#21 0x00007fc40fcf55fd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#22 0x0000000000400d2f in main ()

I'll try to provide other useful informations asap

In very heavy scenes (sorry, not able to provide a useful code right now) if `physics: true` the app produces a core dump. The same code works if I use `Component.onCompleted: physics = true`. Here the backtrack: ``` Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007fc3f68d7230 in QList<ContactEvent>::QList(QList<ContactEvent> const&) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so (gdb) bt #0 0x00007fc3f68d7230 in QList<ContactEvent>::QList(QList<ContactEvent> const&) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #1 0x00007fc3f68d7013 in Box2DWorld::SayGoodbye(b2Fixture*) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #2 0x00007fc3f68bf851 in b2World::DestroyBody(b2Body*) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #3 0x00007fc3f68d8f2d in Box2DBody::setWorld(Box2DWorld*) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #4 0x00007fc3f68f5f3c in Box2DBody::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #5 0x00007fc40e526944 in QQmlVMEMetaObject::metaCall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #6 0x00007fc40e541b7f in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #7 0x00007fc40e5435fb in QQmlPropertyPrivate::writeValueProperty(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #8 0x00007fc40e543d31 in QQmlPropertyPrivate::writeBinding(QObject*, QQmlPropertyData const&, QQmlContextData*, QQmlJavaScriptExpression*, QV4::ValueRef, bool, QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #9 0x00007fc40e5b851c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #10 0x00007fc40e5b8c7e in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #11 0x00007fc40e592497 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #12 0x00007fc40e52f10c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #13 0x00007fc40f324141 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 #14 0x00007fc3f68e238b in Scene::initializeEntities(QQuickItem*) () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #15 0x00007fc3f68e2604 in Scene::componentComplete() () from /usr/lib/x86_64-linux-gnu/qt5/qml/Bacon2D.1.0/libbacon2dplugin.so #16 0x00007fc40e5c19c7 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #17 0x00007fc40e545bab in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #18 0x00007fc40e545c67 in QQmlComponentPrivate::completeCreate() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #19 0x00007fc40e547d70 in QQmlComponent::create(QQmlContext*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5 #20 0x00007fc40fcf51ab in QQuickView::continueExecute() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #21 0x00007fc40fcf55fd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5 #22 0x0000000000400d2f in main () ``` I'll try to provide other useful informations asap

mdkcore0 commented

2015-07-01 01:33:47 +00:00

(Migrated from github.com)

happen on which platform? desktop? mobile?

can you provide a minimal code that the problem occurs with you??

thanks

happen on which platform? desktop? mobile? can you provide a minimal code that the problem occurs with you?? thanks

kenvandine commented

2015-07-01 02:15:00 +00:00

(Migrated from github.com)

Looks like amd64 Ubuntu. Are you using the Ubuntu packages or built from
git? Code sample would be helpful.
On Jun 30, 2015 9:33 PM, "Rodrigo Oliveira" notifications@github.com
wrote:

happen on which platform? desktop? mobile?

can you provide a minimal code that the problem occurs with you??

thanks

—
Reply to this email directly or view it on GitHub
https://github.com/Bacon2D/Bacon2D/issues/114#issuecomment-117387193.

Looks like amd64 Ubuntu. Are you using the Ubuntu packages or built from git? Code sample would be helpful. On Jun 30, 2015 9:33 PM, "Rodrigo Oliveira" notifications@github.com wrote: > happen on which platform? desktop? mobile? > > can you provide a minimal code that the problem occurs with you?? > > thanks > > — > Reply to this email directly or view it on GitHub > https://github.com/Bacon2D/Bacon2D/issues/114#issuecomment-117387193.

rpadovani commented

2015-07-01 12:48:14 +00:00

(Migrated from github.com)

Sorry for missing details.

I'm on Ubuntu 15.04 and I installed the package from the repo.

I created a little demo of the bug, but I'm not sure it's the same, because also with Component.oCompleted trick it crashes.

Also, it requires two scenes, one with physics: true and the other with an entity.

Just using qmlscene bug.qml it crashes

import QtQuick 2.3
import Bacon2D 1.0

Game {
    gameName: "bug.rpadovani"
    height: 100
    width: 100

    Scene {
        anchors.fill: parent
        physics: true
    }

    Scene {
        anchors.fill: parent
        PhysicsEntity {
            fixtures: [
                Edge {
                    vertices: [
                        Qt.point(0, 0),
                        Qt.point(2, 1)
                    ]
                }
            ]
        }
    }
}

Unfortunately for this example gdb is useless 'cause doesn't give informations.
Anyway, the app where first I found the problem is hosted here: https://launchpad.net/falldown
You need to edit falldown/scenes/MainScene.qml to reproduce it

Sorry for missing details. I'm on Ubuntu 15.04 and I installed the package from the repo. I created a little demo of the bug, but I'm not sure it's the same, because also with Component.oCompleted trick it crashes. Also, it requires two scenes, one with physics: true and the other with an entity. Just using `qmlscene bug.qml` it crashes ``` import QtQuick 2.3 import Bacon2D 1.0 Game { gameName: "bug.rpadovani" height: 100 width: 100 Scene { anchors.fill: parent physics: true } Scene { anchors.fill: parent PhysicsEntity { fixtures: [ Edge { vertices: [ Qt.point(0, 0), Qt.point(2, 1) ] } ] } } } ``` Unfortunately for this example gdb is useless 'cause doesn't give informations. Anyway, the app where first I found the problem is hosted here: https://launchpad.net/falldown You need to edit `falldown/scenes/MainScene.qml` to reproduce it

mdkcore0 commented

2015-07-07 14:15:06 +00:00

(Migrated from github.com)

I reproduced it here, pretty strange. Will try to analyze it soon, thanks!

mdkcore0 commented

2015-07-07 14:20:48 +00:00

(Migrated from github.com)

Just a quick check, maybe this problem occur because there are no currentScene being set on Game, changing bug.qml to the below ran without problems:

import QtQuick 2.3
import Bacon2D 1.0

Game {
    gameName: "bug.rpadovani"
    height: 100
    width: 100
    currentScene: Scene {
        anchors.fill: parent
        physics: true
    }

    Scene {
        anchors.fill: parent
        PhysicsEntity {
            fixtures: [
                Edge {
                    vertices: [
                        Qt.point(0, 0),
                        Qt.point(2, 1)
                    ]
                }
            ]
        }
    }
}

can you test with your game to check if it works?

Anyway we should do some verification on it while initializing Game.

Just a quick check, maybe this problem occur because there are no currentScene being set on Game, changing bug.qml to the below ran without problems: ``` import QtQuick 2.3 import Bacon2D 1.0 Game { gameName: "bug.rpadovani" height: 100 width: 100 currentScene: Scene { anchors.fill: parent physics: true } Scene { anchors.fill: parent PhysicsEntity { fixtures: [ Edge { vertices: [ Qt.point(0, 0), Qt.point(2, 1) ] } ] } } } ``` can you test with your game to check if it works? Anyway we should do some verification on it while initializing Game.

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App goes in core dump if the physics = true is istantiated at startup in heavy scenes #114