Version:            (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc 3.3.5 Debian 1:3.3.5-2
OS:                Linux

Best symptom: sfgate.com takes AGES to load, because it blocks while trying to load ad.doubleclick.net


While it's waiting, the stack is as such:
#0  0x4123c115 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/libpthread.so.0
#1  0x40f31498 in QWaitCondition::wait () from /opt/qt-copy/lib/libqt-mt.so.3
#2  0x408efb5c in KNetwork::KResolver::wait (this=0x80b3864, msec=0) at kresolver.cpp:496
#3  0x408952f2 in KExtendedSocket::lookup (this=0xbfffd3b0) at kextsock.cpp:745
#4  0x40896011 in KExtendedSocket::connect (this=0xbfffd3b0) at kextsock.cpp:976
#5  0x401d5914 in KIO::TCPSlaveBase::connectToHost () from /opt/kdecvs/lib/libkio.so.4
#6  0x4183a92f in HTTPProtocol::httpOpenConnection (this=0xbfffdad0) at http.cc:1972
#7  0x4183d2b1 in HTTPProtocol::httpOpen (this=0xbfffdad0) at http.cc:2474
#8  0x418329b0 in HTTPProtocol::retrieveHeader (this=0xbfffdad0, close_connection=false)
    at http.cc:498
#9  0x41832844 in HTTPProtocol::retrieveContent (this=0xbfffdad0, dataInternal=false)
    at http.cc:468
#10 0x41836bc4 in HTTPProtocol::get (this=0xbfffdad0, url=@0xbfffd890) at http.cc:1212
#11 0x401e5402 in KIO::SlaveBase::dispatch () from /opt/kdecvs/lib/libkio.so.4
#12 0x401dfa11 in KIO::SlaveBase::dispatchLoop () from /opt/kdecvs/lib/libkio.so.4
#13 0x4182fe08 in kdemain (argc=4, argv=0x8089d60) at http.cc:108
#14 0x0804ccee in launch ()
#15 0x0804e351 in handle_launcher_request ()
#16 0x0804e89d in handle_requests ()
#17 0x0804fa02 in main ()

At stack level #6:
(gdb) print m_state.hostname.ascii()
$4 = 0x80af828 "ad.doubleclick.net"

And, if this helps:
#2  0x408efb5c in KNetwork::KResolver::wait (this=0x80b3864, msec=0) at kresolver.cpp:496
496     KResolverManager::manager()->notifyWaiters.wait(&d->mutex);


Curiously, the only other thread is the linux pthread administrative thread:
(gdb) info thr
  2 Thread 1117186992 (LWP 19003)  0x414e8d25 in poll () from /lib/tls/libc.so.6
  1 Thread 1098325536 (LWP 18989)  0x4123c115 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/tls/libpthread.so.0


As a workaround, I tried to add the following to my /etc/hosts:
216.73.87.20 ad.doubleclick.net

Which made no difference, thus making me think that bug #57754 is still unfixed.

Please do ask me for any further info you'd like, as this problem has been bothering me for a long time and I'd really like it fixed!