Crash when using a ValueAxis in a ChartView. Why?

[igor_stravinsky]

@ambershark Mixed versions is a thought I had as well. I just did an update to 5.11, and am testing that out. I'll try to get a simple example that crashes for me posted shortly.

@6thC I just installed 5.11, and updated headers, so hopefully the project is now current. I'm compiling on MacOS, and the example you posted worked without a problem for me.

The first crash comes when a ChartView is in a Popup, and the second happens when a ChartView is in a ToolTip, and the crash only happens when the app is quitting, so I'm wondering if the fact that the chart isn't part of a standard qml page (i.e. it's only shown sometimes) has to do with the crash on in the destructor. When I show a chart on a page not on a Popup or ToolTip, it works without a problem.

[6thC]

Are you on a commercial license. That sounds the sort of thing I'd touch base for confirming / getting a bug raised. I think you can directly, I just have a commercial so use the support first, they confirm or deny and even raise bugs for me. It's very much appreciated for a small project (sole developer) as myself.

I'm sorry I have no mac / ios equipment / dev env here to reproduce for you. I think this has narrowed the situation down (potentially) to limited to this system or your specific environment. Hopefully another qt dev using IOS can help? If you have a standalone project with working and broken examples I'd suggest that always helps.

We're lazy (try to be efficient) and time limited so if you already have something others can just hit F5 and confirm or deny expectations and behavior - it'd only be appreciated.

[igor_stravinsky]

@6thC Sadly, I'm working under a free, not commercial license. No support for me...

I have replicated one of my bugs. I'll post that code.

[igor_stravinsky]

Here's a simple example of a chart causing a crash on quit. In this case the chart is inside of a ToolTip

main.qml:

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 1.4

Window {
    visible: true
    width: 1200
    height: 800
    title: qsTr("Hello World")

    Button{
        id:testButton
        text:"test"
        anchors.centerIn:parent
        height:parent.height/8
        width:parent.width/8

        CustomToolTip{
            visible: testButton.hovered
        }
    }
}

CustomToolTip:

import QtQuick 2.11
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.4
import QtCharts 2.2

ToolTip{
    delay: 0

    Rectangle{
        id:tooltipBackgound
        width:400
        height:300
        radius:10
        border.color:"black"

        ChartView {
            title: "Memory"
            antialiasing: true

            PieSeries {
                    id: pieSeries
                    PieSlice { label: "eaten"; value: 94.9 }
                    PieSlice { label: "not yet eaten"; value: 5.1 }
                }
        }
    }   //background rectangle
}

I don't think the crash actually requires a series of any sort. Simply having a chart view in the tool tip seem to be sufficient.

Crash stack trace:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   org.qt-project.QtQml          	0x0000000106033ccb QQmlContextData::ContextGuard::objectDestroyed(QObject*) + 43
1   org.qt-project.QtQml          	0x00000001060161c9 QQmlData::destroyed(QObject*) + 489
2   org.qt-project.QtCore         	0x000000010656924f QObject::~QObject() + 319
3   libqtchartsqml2.dylib         	0x000000010d010b48 QQmlPrivate::QQmlElement<QtCharts::DeclarativePieSeries>::~QQmlElement() + 56
4   org.qt-project.QtQml          	0x0000000105ea8bf8 QV4::MemoryManager::sweep(bool, void (*)(char const*)) + 296
5   org.qt-project.QtQml          	0x0000000105ea9b62 QV4::MemoryManager::~MemoryManager() + 66
6   org.qt-project.QtQml          	0x0000000105f2eb57 QV4::ExecutionEngine::~ExecutionEngine() + 87
7   org.qt-project.QtQml          	0x0000000105f25057 QJSEngine::~QJSEngine() + 103
8   org.qt-project.QtQml          	0x0000000106017572 QQmlEngine::~QQmlEngine() + 370
9   com.onsemi.ToolTipCrashTest   	0x0000000105ab5033 main + 339 (main.cpp:17)
10  libdyld.dylib                 	0x00007fff6383b015 start + 1

[igor_stravinsky]

Here's a simple example of a chart in a popup which causes a crash on quit on my system (MacOS, running Qt 5.11)

main.qml

import QtQuick 2.11
import QtQuick.Window 2.11
import QtQuick.Controls 1.4

Window {
    id:mainWindow
    visible: true
    width: 1200
    height: 800
    title: qsTr("Hello World")

    Button{
        id:testButton
        text:"test"
        anchors.centerIn:parent
        height:parent.height/8
        width:parent.width/8

        onClicked: { customGraph.open() }
    }

    CustomPopup{
        id:customGraph
        width: mainWindow.width/2
        height: mainWindow.height/2
        leftMargin: mainWindow.width/4
        topMargin: mainWindow.height/4
    }
}

CustomPopup.qml:

import QtQuick 2.11
import QtQuick.Controls 2.4
import QtCharts 2.2

Popup {
    id: customPopup

    modal: true
    focus: false
    dim: true

    ChartView {
        id: chartView
        title: "Custom Chart"
        height: parent.height
        antialiasing: true
        theme: ChartView.ChartThemeDark

        ValueAxis {
            id: valueAxisX
        }

        ValueAxis{
            id: valueAxisY
        }

        LineSeries {
            id: powerSeries
            axisX: valueAxisX
            axisY: valueAxisY
            name: "Series"
        }

    }   //chartView

}

And the stack trace from the crash:

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   org.qt-project.QtQml          	0x0000000104be9ccb QQmlContextData::ContextGuard::objectDestroyed(QObject*) + 43
1   org.qt-project.QtQml          	0x0000000104bcc1c9 QQmlData::destroyed(QObject*) + 489
2   org.qt-project.QtCore         	0x000000010512324f QObject::~QObject() + 319
3   libqtchartsqml2.dylib         	0x000000010bae06f0 QQmlPrivate::QQmlElement<QtCharts::QValueAxis>::~QQmlElement() + 32
4   org.qt-project.QtQml          	0x0000000104a5ebf8 QV4::MemoryManager::sweep(bool, void (*)(char const*)) + 296
5   org.qt-project.QtQml          	0x0000000104a5fb62 QV4::MemoryManager::~MemoryManager() + 66
6   org.qt-project.QtQml          	0x0000000104ae4b57 QV4::ExecutionEngine::~ExecutionEngine() + 87
7   org.qt-project.QtQml          	0x0000000104adb057 QJSEngine::~QJSEngine() + 103
8   org.qt-project.QtQml          	0x0000000104bcd572 QQmlEngine::~QQmlEngine() + 370
9   com.onsemi.ToolTipCrashTest   	0x000000010466aca3 main + 339 (main.cpp:17)
10  libdyld.dylib                 	0x00007fff6383b015 start + 1

Any idea why this is happening?

[ambershark]

@igor_stravinsky I will try to get some time to update to 5.11 on my mac and test for you to see if it happens on my system too.

In this case though it really is looking more and more like a bug in Qt. I would try reporting it with that code that makes it reproducible.

If you link the bug report here I will try to upvote it if I can reproduce it when I get time/updates to my mac.

Sadly, I'm working under a free, not commercial license.

Since you are using Qt Charts, just be careful with licensing. Qt Charts is only available under commerical and GPL licenses. You can't make a closed source (LGPL) product with Qt Charts unless you have a commercial license. Just wanted to warn you in case you weren't aware so you didn't end up in trouble later. :)

[igor_stravinsky]

@ambershark Thanks for the reminder about QtCharts being under GPL. I've noted that, and alerted the powers that be above me. I'm not sure if they realize the ramifications right now, but they will...

And I don't think this issue requires an update to 5.11. I was having the problem under 5.10, but upgraded to test if this was still an issue under the new version.

[6thC]

I'd encourage your "higher ups" that commercial is affordable and very worth it.

[ambershark]

@igor_stravinsky said in Crash when using a ValueAxis in a ChartView. Why?:

And I don't think this issue requires an update to 5.11

My mac is on like 5.2 though, so I'd definitely update it before messing around. I haven't written any commercial software for the mac in a while so I haven't updated it recently. I've been busy the last week and haven't had time to even answer questions on the forums much less delve into problems like this. So I never got around to testing it.

Did you ever file a bug?

[igor_stravinsky]

@ambershark QTBUG-68483 has been filed.

[terma.aba]

I get the same thing: Qt 5.12.0, my ChartView with ValueAxis is in a Page in a StackView, crashes on exit.
Noticeable is that if I unwind the StackView before exiting, the application doesn't crash.