[Interest] Qt Android 9 bug?

[Alexander Dyagilev]

1. It does, according to docs.

2. I never subclass QThread and thus never override its run method.


On 11/26/2019 7:53 AM, Vlad Stelmahovsky wrote:
> QThread::quit and QThread::wait  doesn't guarantee that the thread 
> will be finished in time. First of all it depends on your thread 
> architecture: event loop or loop in run()
> easiest way to check this: put qWarning() at the end of run() method
>
> On Tue, Nov 26, 2019 at 3:05 AM Alexander Dyagilev 
> <alervdvcw at gmail.com <mailto:alervdvcw at gmail.com>> 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...
>
>
>     _______________________________________________
>     Interest mailing list
>     Interest at qt-project.org <mailto:Interest at qt-project.org>
>     https://lists.qt-project.org/listinfo/interest
>
>
>
> -- 
> Best regards,
> Vlad
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