Connection closed before finish processing an URL

We are developing an application with QT 4.7.4 that is working as expected, but when making the switch to 4.8.1 we are seeing some static content not loading anymore.

We tough that it was QTBUG-2092427 but using 4.8.2 from git our problem still occurs.

Notes: We've only seen it on SSL and with content that it is present in the disk cache.

With the following image, if you reload some times the bug appear

https://www.itau.cl/personas/images_login/btn-ingresar.jpg

To test it we are using the Browser app that comes with the 4.7 Demos.

This is the console output with the network debug macros enabled:

QNetworkDiskCache::metaData() QUrl( "https://www.itau.cl/personas/images_login/btn-ingresar.jpg" )
QSslSocket::connectToHostImplementation( "www.itau.cl" , 443 , OpenMode( "ReadOnly|WriteOnly" ) )
QAbstractSocket::connectToHost("www.itau.cl", 443, 3)...
QSslSocket::_q_stateChangedSlot( QAbstractSocket::HostLookupState )
QHostInfo::lookupHost("www.itau.cl", 0x102f773a0, _q_startConnecting(QHostInfo))
QAbstractSocket::connectToHost("www.itau.cl", 443) == false (connection in progress)
QHostInfoAgent::fromName(www.itau.cl) looking up...
getaddrinfo node: flags: 0 family: 2 ai_socktype: 2 ai_protocol: 17 ai_addrlen: 16
getaddrinfo node: flags: 0 family: 2 ai_socktype: 1 ai_protocol: 6 ai_addrlen: 16
QHostInfoAgent::fromName(): found 1 entries for "www.itau.cl":

{200.54.67.180}
QAbstractSocketPrivate::_q_startConnecting(hostInfo == {200.54.67.180}

)
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ConnectingState )
QSslSocket::_q_hostFoundSlot()
state = QAbstractSocket::ConnectingState
QAbstractSocketPrivate::_q_connectToNextAddress(), connecting to 200.54.67.180:443, 1 left to try
QAbstractSocketPrivate::resetSocketLayer()
QAbstractSocketPrivate::initSocketLayer(TcpSocket, IPv4Protocol) success
QNativeSocketEnginePrivate::nativeConnect() : 21
QNativeSocketEnginePrivate::nativeConnect(200.54.67.180, 443) == false (Connection in progress)
QNativeSocketEnginePrivate::nativeConnect() : 21
QNativeSocketEnginePrivate::nativeConnect(200.54.67.180, 443) == true
QNativeSocketEnginePrivate::fetchConnectionParameters() local == 192.168.1.100:60362, peer == 200.54.67.180:443, socket == TcpSocket - IPv4Protocol
QAbstractSocketPrivate::connectionNotification() testing connection
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ConnectedState )
QSslSocket::_q_connectedSlot()
state = QAbstractSocket::ConnectedState
peer = "www.itau.cl" QHostAddress( "200.54.67.180" ) 443
QHostInfo::fromName("192.168.1.100")
QHostInfoAgent::fromName(192.168.1.100) looking up...
local = "192.168.1.100" QHostAddress( "192.168.1.100" ) 60362
QSslSocket::startClientEncryption()
QAbstractSocket::writeData(0x10abfc1e0 "\26\3\1\0t\1\0\0p\3\1O\37777777647\37777777745\37777777652\37777777674\37777777716\377777776567\37777777765\377777776542\13\37777777717\37777777634\37777777611\37777777664udq\37777777743\35...", 121) == 121
QSslSocketBackendPrivate::transmit: wrote 121 encrypted bytes to the socket 121 actual.
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocketPrivate::fetchConnectionParameters() connection to 200.54.67.180:443 established
QAbstractSocketPrivate::canWriteNotification() flushing
QNativeSocketEnginePrivate::nativeWrite(0x10426e218 "\26\3\1\0t\1\0\0p\3\1O\37777777647\37777777745\37777777652\37777777674...", 121) == 121
QAbstractSocketPrivate::flush() 121 bytes written to the network
QSslSocket::_q_bytesWrittenSlot( 121 )
QAbstractSocketPrivate::canReadNotification()
QNativeSocketEnginePrivate::nativeBytesAvailable() == 1448
QAbstractSocketPrivate::readFromSocket() about to read 1448 bytes
QNativeSocketEnginePrivate::nativeRead(0x103118018 "\26\3\1\20\37777777762\2\0\0F\3\1O\37777777647\37777777744c^...", 1448) == 1448
QAbstractSocketPrivate::readFromSocket() got 1448 bytes, buffer size = 1448
QAbstractSocket::bytesAvailable() == 1448
QSslSocket::_q_readyReadSlot() - 1448 bytes available
QAbstractSocket::bytesAvailable() == 1448
QAbstractSocket::readData(0x1040e9600 '? (0x16)', 16384) == 1448 [buffer]
QSslSocketBackendPrivate::transmit: read 1448 encrypted bytes from the socket
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocketPrivate::canReadNotification()
QNativeSocketEnginePrivate::nativeBytesAvailable() == 1448
QAbstractSocketPrivate::readFromSocket() about to read 1448 bytes
QNativeSocketEnginePrivate::nativeRead(0x103118018 "\37777777763>\37777777707\37777777722d\37777777720\7\37777777723\37777777762\37777777712\37777777633\377777776700Pe\0...", 1448) == 1448
QAbstractSocketPrivate::readFromSocket() got 1448 bytes, buffer size = 1448
QAbstractSocket::bytesAvailable() == 1448
QSslSocket::_q_readyReadSlot() - 1448 bytes available
QAbstractSocket::bytesAvailable() == 1448
QAbstractSocket::readData(0x1040e9600 '? (0xfffffff3)', 16384) == 1448 [buffer]
QSslSocketBackendPrivate::transmit: read 1448 encrypted bytes from the socket
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocketPrivate::canReadNotification()
QNativeSocketEnginePrivate::nativeBytesAvailable() == 1447
QAbstractSocketPrivate::readFromSocket() about to read 1447 bytes
QNativeSocketEnginePrivate::nativeRead(0x10426e218 "\37777777614b\25E`\27!\37777777742\37777777725B\37777777650w\37777777641U\37777777730C...", 1447) == 1447
QAbstractSocketPrivate::readFromSocket() got 1447 bytes, buffer size = 1447
QAbstractSocket::bytesAvailable() == 1447
QSslSocket::_q_readyReadSlot() - 1447 bytes available
QAbstractSocket::bytesAvailable() == 1447
QAbstractSocket::readData(0x1040e9600 '? (0xffffff8c)', 16384) == 1447 [buffer]
QSslSocketBackendPrivate::transmit: read 1447 encrypted bytes from the socket
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocket::writeData(0x10abfc350 "\26\3\1\1\6\20\0\1\2\1\0%\37777777755\37777777752&\13\13O\16\37777777666\37777777722#P\37777777653u\37777777617\37777777751?\22v\37777777775\37777777772...", 310) == 310
QSslSocketBackendPrivate::transmit: wrote 310 encrypted bytes to the socket 310 actual.
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocketBackendPrivate::transmit: encryption not done yet
QAbstractSocketPrivate::canWriteNotification() flushing
QNativeSocketEnginePrivate::nativeWrite(0x10426e218 "\26\3\1\1\6\20\0\1\2\1\0%\37777777755\37777777752&\13...", 310) == 310
QAbstractSocketPrivate::flush() 310 bytes written to the network
QSslSocket::_q_bytesWrittenSlot( 310 )
QAbstractSocketPrivate::canReadNotification()
QNativeSocketEnginePrivate::nativeBytesAvailable() == 43
QAbstractSocketPrivate::readFromSocket() about to read 43 bytes
QNativeSocketEnginePrivate::nativeRead(0x10426e218 "\24\3\1\0\1\1\26\3\1\0 \37777777770z=\37777777642\37777777736...", 43) == 43
QAbstractSocketPrivate::readFromSocket() got 43 bytes, buffer size = 43
QAbstractSocket::bytesAvailable() == 43
QSslSocket::_q_readyReadSlot() - 43 bytes available
QAbstractSocket::bytesAvailable() == 43
QAbstractSocket::readData(0x1040e9600 '? (0x14)', 16384) == 43 [buffer]
QSslSocketBackendPrivate::transmit: read 43 encrypted bytes from the socket
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: testing encryption
QSslSocket::writeData( 0x1040d6a18 , 807 )
QSslSocketBackendPrivate::transmit: encryption established
QSslSocketBackendPrivate::transmit: encrypted 807 bytes
QAbstractSocket::writeData(0x10abfc350 "\27\3\1\37\37777777635\37777777741\37777777704}\37777777617\20\37777777601\25\37777777763\37777777773\37777777752\37777777761\37777777635[I\37777777747\37777777743T\37777777654bw}ch\37777777663\37777777721\37777777701...", 828) == 828
QSslSocketBackendPrivate::transmit: wrote 828 encrypted bytes to the socket 828 actual.
QAbstractSocket::bytesAvailable() == 0
QAbstractSocket::bytesAvailable() == 0
QAbstractSocketPrivate::canWriteNotification() flushing
QNativeSocketEnginePrivate::nativeWrite(0x10426e218 "\27\3\1\37\37777777635\37777777741\37777777704}\37777777617\20\37777777601\25\37777777763\37777777773\37777777752...", 828) == 828
QAbstractSocketPrivate::flush() 828 bytes written to the network
QSslSocket::_q_bytesWrittenSlot( 828 )
QAbstractSocketPrivate::canReadNotification()
QNativeSocketEnginePrivate::nativeBytesAvailable() == 154
QAbstractSocketPrivate::readFromSocket() about to read 154 bytes
QNativeSocketEnginePrivate::nativeRead(0x10426e218 "\27\3\1\0\34\2\37777777705Aw\37777777725\37777777757h\37777777607*\4\37777777620...", 154) == 154
QAbstractSocketPrivate::readFromSocket() got 154 bytes, buffer size = 154
QAbstractSocket::bytesAvailable() == 154
QSslSocket::_q_readyReadSlot() - 154 bytes available
QAbstractSocket::bytesAvailable() == 154
QAbstractSocket::readData(0x1040e9600 '? (0x17)', 16384) == 154 [buffer]
QSslSocketBackendPrivate::transmit: read 154 encrypted bytes from the socket
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: decrypted 12 bytes
QSslSocket::readData( 0x103252200 , 16384 ) == 12
QAbstractSocket::bytesAvailable() == 0
QSslSocket::readData( 0x103252200 , 16384 ) == 0
QAbstractSocket::bytesAvailable() == 0
QSslSocket::readData( 0x10abfc177 , 1 ) == 0
QAbstractSocket::bytesAvailable() == 0
QSslSocket::readData( 0x103252200 , 16384 ) == 0
QAbstractSocket::bytesAvailable() == 0
QSslSocket::readData( 0x10abfc177 , 1 ) == 0
QAbstractSocket::bytesAvailable() == 0
QSslSocketBackendPrivate::transmit: decrypted 100 bytes
QSslSocket::readData( 0x103252200 , 16384 ) == 100
QAbstractSocket::bytesAvailable() == 0
QSslSocket::close()
QAbstractSocket::close()
QAbstractSocket::disconnectFromHost()
QAbstractSocket::disconnectFromHost() emits stateChanged()(ClosingState)
QSslSocket::_q_stateChangedSlot( QAbstractSocket::ClosingState )
QAbstractSocket::disconnectFromHost() disconnecting immediately
QAbstractSocketPrivate::resetSocketLayer()
QNativeSocketEngine::nativeClose()
QSslSocket::_q_stateChangedSlot( QAbstractSocket::UnconnectedState )
QSslSocket::_q_disconnectedSlot()
state = QAbstractSocket::UnconnectedState
QAbstractSocket::bytesAvailable() == 0
QAbstractSocket::disconnectFromHost() disconnected!
QAbstractSocket::disconnectFromHost() closed!
QAbstractSocket::close()
QAbstractSocketPrivate::canReadNotification() socket is closing - returning
QSslSocket::close()
QAbstractSocket::close()
QAbstractSocket::close()
Received finished signal while progress is still: 10 Url: QUrl( "https://www.itau.cl/personas/images_login/btn-ingresar.jpg" )