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List:       kde-devel
Subject:    KExtendedSocket::startAsyncConnect() freezes application (KDE 3)
From:       Diederik van der Boor <vdboor () codingdomain ! com>
Date:       2007-12-24 19:17:15
Message-ID: 200712242017.15784.vdboor () codingdomain ! com
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Hi,

My application uses a KExtendedSocket::startAsyncConnect() call, but this 
freezes the application for ~2 minutes if the host does not respond.

Can anyone point out a known problem here, or is this a genuine bug? Below 
this e-mail you'll find the backtrace, I've stripped it a bit to make it more 
readable.

Note I'm using KDE 3.5.7, and Qt 3.3.8.

Thanks in advice,

Diederik


--> freeze ends here...

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb667d2c8 in connect () from /lib/libpthread.so.0
#2  0xb4c60a0d in Rconnect () from /usr/lib/libsocks.so
#3  0xb719baab in KSocks::connect () from libkdecore.so.4
#4  0xb72655fb in KExtendedSocket::connectionEvent () from libkdecore.so.4
#5  0xb72665e9 in KExtendedSocket::startAsyncConnect () from libkdecore.so.4
#6  0xb719805b in KExtendedSocket::startAsyncConnectSlot () from 
libkdecore.so.4
#7  0xb726638e in KExtendedSocket::qt_invoke () from libkdecore.so.4
#8  0xb6b8c8ad in QObject::activate_signal () from libqt-mt.so.3
#9  0xb6b8d350 in QObject::activate_signal () from libqt-mt.so.3
#10 0xb71a4140 in KExtendedSocket::lookupFinished () from libkdecore.so.4
#11 0xb71b61f0 in KExtendedSocket::startAsyncLookup () from libkdecore.so.4
#12 0xb72665b6 in KExtendedSocket::startAsyncConnect () from libkdecore.so.4

--> based on the received message, a connection is initiated with the remote 
system:

#13 0x081624b3 in DirectConnectionBase::openConnection (this=0x8690c08, 
ipAddress=@0x869dd10, port=1241, async=true) at 
kmess/network/extra/directconnectionbase.cpp:367
#14 0x08165008 in DirectConnectionPool::addConnection (this=0x86924a0, 
connection=0x8690c08, ipAddress=@0x869dd10, port=1241) at 
kmess/network/extra/directconnectionpool.cpp:94

...

--> entering the application at the readyRead() signal handler.

#28 0x081148a7 in MsnConnection::dataReceived (this=0x8430bf8)
    at kmess/network/msnconnection.cpp:330
#29 0x081150c9 in MsnConnection::qt_invoke (this=0x8430bf8, _id=4, 
_o=0xbf939394) at ./msnconnection.moc:136
#30 0x0812c535 in MsnSwitchboardConnection::qt_invoke (this=0x8430bf8, _id=4,
    _o=0xbf939394) at ./msnswitchboardconnection.moc:325
#31 0xb6b8c8ad in QObject::activate_signal () from libqt-mt.so.3
#32 0xb6b8d44d in QObject::activate_signal () from libqt-mt.so.3
#33 0xb71a3c69 in KAsyncIO::readyRead () from libkdecore.so.4
#34 0xb7265f89 in KExtendedSocket::socketActivityRead () from libkdecore.so.4
#35 0xb7266340 in KExtendedSocket::qt_invoke () from libkdecore.so.4
#36 0xb6b8c8ad in QObject::activate_signal () from libqt-mt.so.3
#37 0xb6b8d350 in QObject::activate_signal () from libqt-mt.so.3
#38 0xb6ec14a0 in QSocketNotifier::activated () from libqt-mt.so.3
#39 0xb6baa3f0 in QSocketNotifier::event () from libqt-mt.so.3
#40 0xb6b2e0ac in QApplication::internalNotify () from libqt-mt.so.3
#41 0xb6b2ee96 in QApplication::notify () from libqt-mt.so.3
#42 0xb728aee2 in KApplication::notify () from libkdecore.so.4
#43 0xb6b22521 in QEventLoop::activateSocketNotifiers () from libqt-mt.so.3
#44 0xb6add236 in QEventLoop::processEvents () from libqt-mt.so.3
#45 0xb6b44c30 in QEventLoop::enterLoop () from libqt-mt.so.3
#46 0xb6b44ac6 in QEventLoop::exec () from libqt-mt.so.3
#47 0xb6b2dc1f in QApplication::exec () from libqt-mt.so.3
#48 0x08095ba9 in main (argc=135760396, argv=0x22) at kmess/main.cpp:223


-- 
Peace cannot be kept by force; it can only be
achieved by understanding.  -- A. Einstein
 
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