Bug 1630184

Created attachment 1484256 [details]
Full backtrace exported from gdb

Description of problem:
I am running a custom build of QuiteRSS which is built against Qt5 instead of Qt4. You can see the changes at [1]

Version-Release number of selected component (if applicable):
qt5-qtbase-5.11.1-7.fc28.x86_64
qtsingleapplication-qt5-2.6.1-32.fc28.x86_64
qt5-qtwebkit-5.212.0-0.27.alpha2.fc28.x86_64
qt5-qtwebengine-5.11.1-4.fc28.x86_64

How reproducible:
always with this application

Steps to Reproduce:
1. update qt5 to 5.11.1-7
2. start quiterss

Actual results:
Quiterss fails to start. The backtrace is deep in Qt code so I think that QuiteRSS code is not to blame. This is the truncated backtrace (full backtrace attached):

#0  0x00007ffff2722edf in memcpy.5 ()
    at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:141
#1  0x00007ffff39627c9 in memcpy (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>)
    at /usr/include/bits/string_fortified.h:34
#2  0x00007ffff39627c9 in QString::append(QString const&) (this=this@entry=0x7fffffffccf8, str=...)
    at tools/qstring.cpp:2444
#3  0x00005555556795fe in QString::operator+=(QString const&) (s=..., this=0x7fffffffccf8)
    at /usr/include/qt5/QtCore/qstring.h:474
#4  0x00005555556795fe in operator+(QString const&, char const*) (s2=0x555555729f59 "/debug.log", s1=...) at /usr/include/qt5/QtCore/qstring.h:1341
#5  0x00005555556795fe in LogFile::msgHandler(QtMsgType, QMessageLogContext const&, QString const&) (type=QtInfoMsg, msg=...) at src/application/logfile.cpp:40
#6  0x00007ffff38e1955 in qt_message_print(QtMsgType, QMessageLogContext const&, QString const&) (msgType=QtInfoMsg, context=..., message=...) at /usr/include/c++/8/bits/atomic_base.h:82
#7  0x00007ffff38e319c in qt_message_output(QtMsgType, QMessageLogContext const&, QString const&) (msgType=QtInfoMsg, context=..., message=...) at global/qlogging.cpp:1851
#8  0x00007ffff39cb658 in QDebug::~QDebug() (this=0x7fffffffcee8, __in_chrg=<optimized out>)
    at io/qdebug.cpp:154
#9  0x00007ffff3fd03e2 in QGuiApplicationPrivate::createPlatformIntegration() (this=0x5555559fb070)
    at kernel/qguiapplication.cpp:1306
#10 0x00007ffff3fd0595 in QGuiApplicationPrivate::createEventDispatcher() (this=<optimized out>)
    at kernel/qguiapplication.cpp:1389
#11 0x00007ffff3a8b5f5 in QCoreApplicationPrivate::init() (this=<optimized out>)
    at kernel/qcoreapplication.cpp:845
#12 0x00007ffff3fd2463 in QGuiApplicationPrivate::init() (this=0x5555559fb070)
    at kernel/qguiapplication.cpp:1418
#13 0x00007ffff73be10d in QApplicationPrivate::init() (this=0x5555559fb070)
    at kernel/qapplication.cpp:565
#14 0x00007ffff78cf235 in QtSingleApplication::QtSingleApplication(int&, char**, bool) (this=0x7fffffffd210, argc=<optimized out>, argv=<optimized out>, GUIenabled=<optimized out>)
    at ../../src/qtsingleapplication.cpp:154

Expected results:
QuiteRSS should start just fine.

Additional info:
with Qt 5.10.1, anything worked fine.

"Good" Qt versions:
qt5-qtbase-5.10.1-6
qt5-qtwebkit-5.10.1-4
qt5-qtwebkit-5.212.0-0.20.alpha2.fc28.x86_64
same version of qtsingleapplication-qt5

[1] https://src.fedoraproject.org/rpms/quiterss/pull-request/2

PS: Does anyone know why this pull request is not being merged? It seems like it is completely ignored. The previous version (pull #1) has been open unanswered for a year.