It is a strange bug. I am able to reproduce it again and again only while browsing wikipedia site and only if I have set the following debug info: debug_options 26,9 85,9 33,9 87,9 44,9 If I change something in this line the bug disappeared. I can not get good debug info :-(
Here are some logs and a backtrace: 2008/04/07 22:34:30.502| clientWriteComplete: FD 31 Keeping Alive 2008/04/07 22:34:30.502| ClientSocketContext::keepaliveNextRequest: FD 31 2008/04/07 22:34:30.502| clientStreamDetach: Detaching node 0x85c5a30 2008/04/07 22:34:30.502| Freeing clientStreamNode 0x85c5a30 2008/04/07 22:34:30.502| httpRequestFree: http://en.wikipedia.org/images/wikimedia-button.png 2008/04/07 22:34:30.502| clientLogRequest: al.url='http://en.wikipedia.org/images/wikimedia-button.png' 2008/04/07 22:34:30.502| clientLogRequest: http.code='304' 2008/04/07 22:34:30.502| clientStreamAbort: Aborting stream with tail 0x85c59e8 2008/04/07 22:34:30.502| clientStreamDetach: Detaching node 0x85c59e8 2008/04/07 22:34:30.502| clientStreamDetach: Calling 1 with cbdata 0xb77c6174 2008/04/07 22:34:30.502| Freeing clientStreamNode 0x85c59e8 2008/04/07 22:34:30.502| clientParseRequest: FD 31: attempting to parse 2008/04/07 22:34:30.502| ClientSocketContext:: FD 31: calling conn->readNextRequest() 2008/04/07 22:34:30.502| ConnStateData::readNextRequest: FD 31 reading next req 2008/04/07 22:34:30.502| The AsyncCall ConnStateData::requestTimeout constructed, this=0x86305e0 [call13713] 2008/04/07 22:34:30.502| leaving clientWriteComplete(FD 31, data=0xb7ee30c0) 2008/04/07 22:35:10| assertion failed: pconn.cc:89: "index >= 0" Program received signal SIGABRT, Aborted. 0xb7f03410 in ?? () (gdb) backtrace #0 0xb7f03410 in ?? () #1 0xbfe9bfbc in ?? () #2 0x00000006 in ?? () #3 0x00001435 in ?? () #4 0xb7c67060 in raise () from /lib/libc.so.6 #5 0xb7c68801 in abort () from /lib/libc.so.6 #6 0x0808f0a0 in xassert (msg=0x817ec96 "index >= 0", file=0x817ec83 "pconn.cc", line=89) at debug.cc:578 #7 0x080e5c96 in IdleConnList::removeFD (this=0xb7694068, fd=17) at pconn.cc:89 #8 0x080e6075 in IdleConnList::read (fd=17, buf=0xb7694080 "", len=0, flag=COMM_OK, xerrno=0, data=0xb7694068) at pconn.cc:162 #9 0x08125d65 in CommIoCbPtrFun::dial (this=0x865f5b4) at CommCalls.cc:150 #10 0x08062e73 in AsyncCallQueue::fireNext (this=0x836d2d8) at AsyncCallQueue.cc:53 #11 0x08062f59 in AsyncCallQueue::fire (this=0x836d2d8) at AsyncCallQueue.cc:39 #12 0x08097943 in EventLoop::dispatchCalls (this=0xbfe9c250) at EventLoop.cc:154 #13 0x08097b47 in EventLoop::runOnce (this=0xbfe9c250) at EventLoop.cc:131 #14 0x08097c0a in EventLoop::run (this=0xbfe9c250) at EventLoop.cc:95 #15 0x080db042 in main (argc=5, argv=0xbfe9c334) at main.cc:1361 (gdb) >From linux proc stats (/proc/net/tcp) I can see that it is a client-side socket ...