[Interest] Qt Android 9 bug?

[Tony Rietwyk]

Hi Alex,

That Armv7 trace looks really weird - the QThread destructor is calling 
the derived QDaemonThread one?

Regards, Tony


On 26/11/2019 1:02 pm, Alexander Dyagilev wrote:
>
> Hello,
>
> We're getting strange crashes in our Google Console. All of them are 
> from Android 9.
>
> We use Qt 5.12.5.
>
> Armv7 reports are all as the following:
>
> *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** pid: 
> 0, tid: 0 >>> org.freedownloadmanager.fdm <<< backtrace:
> #00 pc 000000000001cf76 /system/lib/libc.so (abort+58)
> #01 pc 00000000000834dd 
> /data/app/org.freedownloadmanager.fdm--OVRDQQmEuXHU_lSXwlfxA==/lib/arm/libQt5Core.so
> #02 pc 0000000000083bc7 
> /data/app/org.freedownloadmanager.fdm--OVRDQQmEuXHU_lSXwlfxA==/lib/arm/libQt5Core.so 
> (QMessageLogger::fatal(char const*, ...) const+58)
> #03 pc 00000000000868df 
> /data/app/org.freedownloadmanager.fdm--OVRDQQmEuXHU_lSXwlfxA==/lib/arm/libQt5Core.so 
> (QDaemonThread::~QDaemonThread()+174)
> #04 pc 0000000000086a8d 
> /data/app/org.freedownloadmanager.fdm--OVRDQQmEuXHU_lSXwlfxA==/lib/arm/libQt5Core.so 
> (QThread::~QThread()+4)
>
> Armv8 reports are even less informative:
>
> *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** pid: 
> 0, tid: 0 >>> org.freedownloadmanager.fdm <<< backtrace:
> #00 pc 0000000000022988 /system/lib64/libc.so (abort+116)
> #01 pc 00000000000ad994 
> /data/app/org.freedownloadmanager.fdm-oQm9cQzA_x7sVQd81KmLCw==/lib/arm64/libQt5Core.so
> #02 pc 00000000000af078 
> /data/app/org.freedownloadmanager.fdm-oQm9cQzA_x7sVQd81KmLCw==/lib/arm64/libQt5Core.so 
> (QMessageLogger::fatal(char const*, ...) const+208)
>
> The only qFatal call in the destructor is see in QThread source 
> (https://code.woboq.org/qt5/qtbase/src/corelib/thread/qthread.cpp.html) 
> is this:
>
> qFatal("QThread: Destroyed while thread is still running");
>
> But I'm pretty sure we call QThread::quit and QThread::wait before 
> deleting all QThread objects we create. So it should not be possible 
> that the problem resides on our side.
>
> Any suggestions? Can this be the bug of qt android core? We can't 
> reproduce it and this bug is NOT happening under Windows platform...
>
>
>
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> Interest at qt-project.org
> https://lists.qt-project.org/listinfo/interest
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