Details
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Bug
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Resolution: Done
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P1: Critical
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None
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5.7.1, 5.8.0
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None
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Archlinux
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254f35ce98bebd8f4446fec66bb50f2126b61c28
Description
I haven't been able to write an example using QNetworkDiskCache directly which reproduces this, but with this example using QtWebKit (either the reloaded fork or the 5.8 community release) I get a segfault after the page is loaded:
#include <QApplication> #include <QNetworkDiskCache> #include <QNetworkAccessManager> #include <QWebView> int main(int argc, char *argv[]) { QApplication app(argc, argv); QNetworkDiskCache cache; cache.setCacheDirectory("cache_test"); QNetworkAccessManager nam; nam.setCache(&cache); QWebView webview; webview.page()->setNetworkAccessManager(&nam); webview.load(QUrl("http://seriouseats.com")); webview.show(); return app.exec(); }
.pro file:
TEMPLATE = app QT += network widgets webkitwidgets TARGET = cache SOURCES += cache.cpp
As far as I'm aware, this is a Qt 5.8 regression. When not using a cache, the page loads fine. This happens on various other websites too.
Stack (note the this=0x0):
#0 0x00007ffff69f4cf7 in QRingBuffer::append(QByteArray const&) (this=0x0, qba=...) at tools/qringbuffer.cpp:339 #1 0x00007ffff70321ee in QIODevicePrivate::QRingBufferRef::append(QByteArray const&) (qba=..., this=0x555555fca070) at ../../include/QtCore/5.8.0/QtCore/private/../../../../../src/corelib/io/qiodevice_p.h:117 #2 0x00007ffff70321ee in QNetworkReplyHttpImplPrivate::_q_cacheLoadReadyRead() (this=0x555555fc9fe0) at access/qnetworkreplyhttpimpl.cpp:1813 #3 0x00007ffff70de3e9 in QNetworkReplyHttpImpl::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qnetworkreplyhttpimpl_p.cpp:246 #4 0x00007ffff6b83c49 in QObject::event(QEvent*) (this=0x555555fc9f90, e=<optimized out>) at kernel/qobject.cpp:1263 #5 0x00007ffff748e3dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x555555fc9f90, e=0x555555fe0450) at kernel/qapplication.cpp:3745 #6 0x00007ffff7495bf1 in QApplication::notify(QObject*, QEvent*) (this=0x7fffffffdf10, receiver=0x555555fc9f90, e=0x555555fe0450) at kernel/qapplication.cpp:3502 #7 0x00007ffff6b574e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x555555fc9f90, event=event@entry=0x555555fe0450) at kernel/qcoreapplication.cpp:988 #8 0x00007ffff6b59c6d in QCoreApplication::sendEvent(QObject*, QEvent*) (event=0x555555fe0450, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231 #9 0x00007ffff6b59c6d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x5555557772d0) at kernel/qcoreapplication.cpp:1648 #10 0x00007ffff6b5a0d8 in QCoreApplication::sendPostedEvents(QObject*, int) (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1502 #11 0x00007ffff6babce3 in postEventSourceDispatch(GSource*, GSourceFunc, gpointer) (s=0x555555848110) at kernel/qeventdispatcher_glib.cpp:276 #12 0x00007fffeebf25a7 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0 #13 0x00007fffeebf2810 in () at /usr/lib/libglib-2.0.so.0 #14 0x00007fffeebf28bc in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0 #15 0x00007ffff6bac0ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x555555848000, flags=...) at kernel/qeventdispatcher_glib.cpp:423 #16 0x00007ffff6b5593a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fffffffde80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #17 0x00007ffff6b5de84 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1261 #18 0x0000555555555107 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at cache.cpp:22
valgrind:
==6714== Invalid read of size 4 ==6714== at 0x5D8DCF7: QRingBuffer::append(QByteArray const&) (qringbuffer.cpp:339) ==6714== by 0x59621ED: append (qiodevice_p.h:117) ==6714== by 0x59621ED: QNetworkReplyHttpImplPrivate::_q_cacheLoadReadyRead() (qnetworkreplyhttpimpl.cpp:1813) ==6714== by 0x5A0E3E8: QNetworkReplyHttpImpl::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (moc_qnetworkreplyhttpimpl_p.cpp:246) ==6714== by 0x5F1CC48: QObject::event(QEvent*) (qobject.cpp:1263) ==6714== by 0x51D43DB: QApplicationPrivate::notify_helper(QObject*, QEvent*) (qapplication.cpp:3745) ==6714== by 0x51DBBF0: QApplication::notify(QObject*, QEvent*) (qapplication.cpp:3502) ==6714== by 0x5EF04DF: QCoreApplication::notifyInternal2(QObject*, QEvent*) (qcoreapplication.cpp:988) ==6714== by 0x5EF2C6C: sendEvent (qcoreapplication.h:231) ==6714== by 0x5EF2C6C: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (qcoreapplication.cpp:1648) ==6714== by 0x5F44CE2: postEventSourceDispatch(_GSource*, int (*)(void*), void*) (qeventdispatcher_glib.cpp:276) ==6714== by 0xDDA05A6: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5000.3) ==6714== by 0xDDA080F: ??? (in /usr/lib/libglib-2.0.so.0.5000.3) ==6714== by 0xDDA08BB: g_main_context_iteration (in /usr/lib/libglib-2.0.so.0.5000.3) ==6714== Address 0xc is not stack'd, malloc'd or (recently) free'd ==6714== ==6714== ==6714== Process terminating with default action of signal 11 (SIGSEGV): dumping core ==6714== Access not within mapped region at address 0xC ==6714== at 0x5D8DCF7: QRingBuffer::append(QByteArray const&) (qringbuffer.cpp:339) ==6714== by 0x59621ED: append (qiodevice_p.h:117) ==6714== by 0x59621ED: QNetworkReplyHttpImplPrivate::_q_cacheLoadReadyRead() (qnetworkreplyhttpimpl.cpp:1813) ==6714== by 0x5A0E3E8: QNetworkReplyHttpImpl::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (moc_qnetworkreplyhttpimpl_p.cpp:246) ==6714== by 0x5F1CC48: QObject::event(QEvent*) (qobject.cpp:1263) ==6714== by 0x51D43DB: QApplicationPrivate::notify_helper(QObject*, QEvent*) (qapplication.cpp:3745) ==6714== by 0x51DBBF0: QApplication::notify(QObject*, QEvent*) (qapplication.cpp:3502) ==6714== by 0x5EF04DF: QCoreApplication::notifyInternal2(QObject*, QEvent*) (qcoreapplication.cpp:988) ==6714== by 0x5EF2C6C: sendEvent (qcoreapplication.h:231) ==6714== by 0x5EF2C6C: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (qcoreapplication.cpp:1648) ==6714== by 0x5F44CE2: postEventSourceDispatch(_GSource*, int (*)(void*), void*) (qeventdispatcher_glib.cpp:276) ==6714== by 0xDDA05A6: g_main_context_dispatch (in /usr/lib/libglib-2.0.so.0.5000.3) ==6714== by 0xDDA080F: ??? (in /usr/lib/libglib-2.0.so.0.5000.3) ==6714== by 0xDDA08BB: g_main_context_iteration (in /usr/lib/libglib-2.0.so.0.5000.3)