439214 - [FIX]Lockup in nsXMLHttpRequest::Send() before any data is sent over the network.

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect)

Description

[Vesselin]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.14) Gecko/20080416 Fedora/2.0.0.14-1.fc8 Firefox/2.0.0.14
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.14) Gecko/20080416 Fedora/2.0.0.14-1.fc8 Firefox/2.0.0.14

Firefox 2.0.0.14 locks in when making synchronous requests. I know that the UI should be frozen while FF performs synchronous requests until the request is complete. However in this case the lock-up occurs before Firefox even tries to send any traffic over the network - I am watching the network with tcpdump, so Firefox does not send anything ove the network. I waited for 15-20 minutes for FF to recover but it just stayed frozen.

It seems that the lock-up occurs when XMLHttpRequest.send() is called from inside a Comet handler for server-side events. The lock-up only occurs when re-using the XMLHttpRequest object. If a new XMLHttpRequest object is created for each AJAX request, then the lock-up does not occur.

In the additional information section I attach a GDB session for the locked-up browser.

As it can be seen from debug.txt, the lockup occurs in:
nsXMLHttpRequest::Send (this=0xc4438e0, aBody=0xcd3bea0) in nsXMLHttpRequest.cpp:1725

The source code for nsXMLHttpRequest.cpp is available at:
http://mxr.mozilla.org/mozilla1.8/source/content/base/src/nsXMLHttpRequest.cpp

The lock-up occurs in the following piece of code:

1718   // If we're synchronous, spin an event loop here and wait
1719   if (!(mState & XML_HTTP_REQUEST_ASYNC)) {
1720     while (mState & XML_HTTP_REQUEST_SYNCLOOPING) {
1721       modalEventQueue->ProcessPendingEvents();
1722
1723       // Be sure not to busy wait! (see bug 273578)
1724       if (mState & XML_HTTP_REQUEST_SYNCLOOPING)
1725         PR_Sleep(PR_MillisecondsToInterval(10));
1726     }
1727
1728     mEventQService->PopThreadEventQueue(modalEventQueue);
1729   } else {

When the lockup occurs mState has the value 2177 (0x0881)
which is effectively:

XML_HTTP_REQUEST_UNINITIALIZED |
XML_HTTP_REQUEST_ABORTED |
XML_HTTP_REQUEST_SYNCLOOPING

It seems that while performing the call to
nsXMLHttpRequest::Send(nsIVariant *aBody)

somehow
NS_IMETHODIMP nsXMLHttpRequest::Abort()
has been invoked, and since that method does not clear the:
XML_HTTP_REQUEST_SYNCLOOPING flag, the code loops forever.

The lockup does not occur always. It often occurs after 2-3 synchronous requests  re-using the same XmlHttpRequest object. Sometimes it takes 10-15 requestsfor the lockup to occur. Each XmlHttpRequest must be performed from within the Comet handler.

Reproducible: Sometimes

Steps to Reproduce:
1. Create a Comet (HTTP streaming handler for server-side events).
2. Using the Comet connection send some javascript code from the server to the browser.
3. In that js code make a synchronous XmlHttpRquest to the same server.

Actual Results:  
The Firefox browser locks up forever.

Expected Results:  
The synchronous request should be completed successfully or an error event should be fired

[?1034hGNU gdb Red Hat Linux (6.6-45.fc8rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
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Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
Attaching to program: /usr/lib/firefox-2.0.0.14/firefox-bin, process 22152
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Reading symbols from /usr/lib/libavahi-client.so.3...done.
Loaded symbols for /usr/lib/libavahi-client.so.3
Reading symbols from /lib/libresolv.so.2...Reading symbols from /usr/lib/debug/lib/libresolv-2.7.so.debug...done.
done.
Loaded symbols for /lib/libresolv.so.2
Reading symbols from /lib/libselinux.so.1...done.
Loaded symbols for /lib/libselinux.so.1
Reading symbols from /lib/libutil.so.1...Reading symbols from /usr/lib/debug/lib/libutil-2.7.so.debug...done.
done.
Loaded symbols for /lib/libutil.so.1
Reading symbols from /usr/lib/libORBitCosNaming-2.so.0...Reading symbols from /usr/lib/debug/usr/lib/libORBitCosNaming-2.so.0.1.0.debug...done.
done.
Loaded symbols for /usr/lib/libORBitCosNaming-2.so.0
Reading symbols from /lib/libasound.so.2...done.
Loaded symbols for /lib/libasound.so.2
Reading symbols from /lib/libnsl.so.1...Reading symbols from /usr/lib/debug/lib/libnsl-2.7.so.debug...done.
done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libcap.so.1...done.
Loaded symbols for /lib/libcap.so.1
Reading symbols from /usr/lib/libgssapi_krb5.so.2...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.2
Reading symbols from /usr/lib/libkrb5.so.3...done.
Loaded symbols for /usr/lib/libkrb5.so.3
Reading symbols from /lib/libcom_err.so.2...done.
Loaded symbols for /lib/libcom_err.so.2
Reading symbols from /usr/lib/libk5crypto.so.3...done.
Loaded symbols for /usr/lib/libk5crypto.so.3
Reading symbols from /usr/lib/libkrb5support.so.0...done.
Loaded symbols for /usr/lib/libkrb5support.so.0
Reading symbols from /lib/libkeyutils.so.1...done.
Loaded symbols for /lib/libkeyutils.so.1
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libwebbrwsr.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libwebbrwsr.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libwebbrwsr.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libpermissions.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libpermissions.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libpermissions.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libcookie.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libcookie.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libcookie.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libpipboot.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libpipboot.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libpipboot.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/liboji.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/liboji.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/liboji.so
Reading symbols from /usr/lib/firefox-2.0.0.14/libjsj.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/libjsj.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/libjsj.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libuconv.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libuconv.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libuconv.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libremoteservice.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libremoteservice.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libremoteservice.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libhtmlpars.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libhtmlpars.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libhtmlpars.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libbrowsercomps.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libbrowsercomps.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libbrowsercomps.so
Reading symbols from /usr/lib/firefox-2.0.0.14/libxpcom_compat.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/libxpcom_compat.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/libxpcom_compat.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libuniversalchardet.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libuniversalchardet.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libuniversalchardet.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libpipnss.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libpipnss.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libpipnss.so
Reading symbols from /usr/lib/libssl3.so...Reading symbols from /usr/lib/debug/usr/lib/libssl3.so.debug...done.
done.
Loaded symbols for /usr/lib/libssl3.so
Reading symbols from /usr/lib/libsmime3.so...Reading symbols from /usr/lib/debug/usr/lib/libsmime3.so.debug...done.
done.
Loaded symbols for /usr/lib/libsmime3.so
Reading symbols from /usr/lib/libnss3.so...Reading symbols from /usr/lib/debug/usr/lib/libnss3.so.debug...done.
done.
Loaded symbols for /usr/lib/libnss3.so
Reading symbols from /usr/lib/libsoftokn3.so...Reading symbols from /usr/lib/debug/usr/lib/libsoftokn3.so.debug...done.
done.
Loaded symbols for /usr/lib/libsoftokn3.so
Reading symbols from /usr/lib/libfreebl3.so...Reading symbols from /usr/lib/debug/usr/lib/libfreebl3.so.debug...done.
done.
Loaded symbols for /usr/lib/libfreebl3.so
Reading symbols from /usr/lib/libnssckbi.so...Reading symbols from /usr/lib/debug/usr/lib/libnssckbi.so.debug...done.
done.
Loaded symbols for /usr/lib/libnssckbi.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libeditor.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libeditor.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libeditor.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libtxmgr.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libtxmgr.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libtxmgr.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libspellchecker.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libspellchecker.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libspellchecker.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libcomposer.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libcomposer.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libcomposer.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libimgicon.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libimgicon.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libimgicon.so
Reading symbols from /usr/lib/libgnomeui-2.so.0...Reading symbols from /usr/lib/debug/usr/lib/libgnomeui-2.so.0.2000.1.debug...done.
done.
Loaded symbols for /usr/lib/libgnomeui-2.so.0
Reading symbols from /usr/lib/libbonoboui-2.so.0...Reading symbols from /usr/lib/debug/usr/lib/libbonoboui-2.so.0.0.0.debug...done.
done.
Loaded symbols for /usr/lib/libbonoboui-2.so.0
Reading symbols from /usr/lib/libgnomecanvas-2.so.0...Reading symbols from /usr/lib/debug/usr/lib/libgnomecanvas-2.so.0.1998.3.debug...done.
done.
Loaded symbols for /usr/lib/libgnomecanvas-2.so.0
Reading symbols from /usr/lib/libart_lgpl_2.so.2...Reading symbols from /usr/lib/debug/usr/lib/libart_lgpl_2.so.2.3.19.debug...done.
done.
Loaded symbols for /usr/lib/libart_lgpl_2.so.2
Reading symbols from /usr/lib/libgnome-keyring.so.0...done.
Loaded symbols for /usr/lib/libgnome-keyring.so.0
Reading symbols from /usr/lib/libgailutil.so.18...done.
Loaded symbols for /usr/lib/libgailutil.so.18
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libstoragecomps.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libstoragecomps.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libstoragecomps.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libnecko2.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libnecko2.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libnecko2.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libmozgnome.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libmozgnome.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libmozgnome.so
Reading symbols from /usr/lib/firefox-2.0.0.14/components/libmork.so...Reading symbols from /usr/lib/debug/usr/lib/firefox-2.0.0.14/components/libmork.so.debug...done.
done.
Loaded symbols for /usr/lib/firefox-2.0.0.14/components/libmork.so
Reading symbols from /lib/libnss_dns.so.2...Reading symbols from /usr/lib/debug/lib/libnss_dns-2.7.so.debug...done.
done.
Loaded symbols for /lib/libnss_dns.so.2
0x00110416 in __kernel_vsyscall ()
(gdb) bt
#0  0x00110416 in __kernel_vsyscall ()
#1  0x006c9902 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x004a0336 in pt_TimedWait (cv=0xcb4932c, ml=0x947a448, timeout=10) at ../../../mozilla/nsprpub/pr/src/pthreads/ptsynch.c:280
#3  0x004a1174 in PR_WaitCondVar (cvar=0xcb49328, timeout=10) at ../../../mozilla/nsprpub/pr/src/pthreads/ptsynch.c:407
#4  0x004a6cdf in PR_Sleep (ticks=10) at ../../../mozilla/nsprpub/pr/src/pthreads/ptthread.c:791
#5  0x01194ae7 in nsXMLHttpRequest::Send (this=0xc4438e0, aBody=0xcd3bea0) at nsXMLHttpRequest.cpp:1725
#6  0x0208e829 in XPTC_InvokeByIndex () at xptcinvoke_gcc_x86_unix.cpp:50
#7  0x003ace04 in XPCWrappedNative::CallMethod (ccx=@0xbff74a1c, mode=XPCWrappedNative::CALL_METHOD) at xpcwrappednative.cpp:2169
#8  0x003b3bce in XPC_WN_CallMethod (cx=0xbd381c8, obj=0xb030170, argc=1, argv=0xcc37df4, vp=0xbff74b40) at xpcwrappednativejsops.cpp:1455
#9  0x0018f215 in js_Invoke (cx=0xbd381c8, argc=1, flags=0) at jsinterp.c:1384
#10 0x00191307 in js_Interpret (cx=0xbd381c8, pc=0xbce022b "=", result=0xbff74eb8) at jsinterp.c:3953
#11 0x0018f970 in js_Invoke (cx=0xbd381c8, argc=3, flags=6) at jsinterp.c:1403
#12 0x001890dd in fun_call (cx=0xbd381c8, obj=0xcca36d0, argc=3, argv=0xcc37c70, rval=0xbff74fb0) at jsfun.c:1609
#13 0x0018f215 in js_Invoke (cx=0xbd381c8, argc=4, flags=0) at jsinterp.c:1384
#14 0x00191307 in js_Interpret (cx=0xbd381c8, pc=0xc747cf6 "<", result=0xbff75328) at jsinterp.c:3953
#15 0x0018f970 in js_Invoke (cx=0xbd381c8, argc=1, flags=2) at jsinterp.c:1403
#16 0x003a969d in nsXPCWrappedJSClass::CallMethod (this=0x9a7e0a0, wrapper=0xc76e810, methodIndex=3, info=0x97bca48, nativeParams=0xbff7563c)
    at xpcwrappedjsclass.cpp:1453
#17 0x003a3fe3 in nsXPCWrappedJS::CallMethod (this=0xc76e810, methodIndex=3, info=0x97bca48, params=0xbff7563c) at xpcwrappedjs.cpp:467
#18 0x0208f3f1 in PrepareAndDispatch (methodIndex=<value optimized out>, self=0xc76e810, args=<value optimized out>) at xptcstubs_gcc_x86_unix.cpp:100
#19 0x011a1de2 in nsEventListenerManager::HandleEventSubType (this=0xc76e840, aListenerStruct=0xc69d868, aListener=0xc76e810, aDOMEvent=0xccc3b90,
    aCurrentTarget=0xc672b10, aSubType=4, aPhaseFlags=2) at nsEventListenerManager.cpp:1655
#20 0x011a23f1 in nsEventListenerManager::HandleEvent (this=0xc76e840, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aCurrentTarget=0xc672b10, aFlags=2, aEventStatus=0xbff764d0) at nsEventListenerManager.cpp:1759
#21 0x01167595 in nsGenericElement::HandleDOMEvent (this=0xc629778, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4, aFlags=2,
    aEventStatus=0xbff764d0) at nsGenericElement.cpp:2232
#22 0x0116779d in nsGenericElement::HandleDOMEvent (this=0xcdd2610, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aFlags=<value optimized out>, aEventStatus=0xbff764d0) at nsGenericElement.cpp:2261
#23 0x0116779d in nsGenericElement::HandleDOMEvent (this=0xc737f78, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aFlags=<value optimized out>, aEventStatus=0xbff764d0) at nsGenericElement.cpp:2261
#24 0x0116779d in nsGenericElement::HandleDOMEvent (this=0xc69d010, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aFlags=<value optimized out>, aEventStatus=0xbff764d0) at nsGenericElement.cpp:2261
#25 0x0116779d in nsGenericElement::HandleDOMEvent (this=0xc69cfa0, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aFlags=<value optimized out>, aEventStatus=0xbff764d0) at nsGenericElement.cpp:2261
#26 0x0116779d in nsGenericElement::HandleDOMEvent (this=0xc69d3c0, aPresContext=0xb00ee10, aEvent=0xbff7602c, aDOMEvent=0xbff75ed4,
    aFlags=<value optimized out>, aEventStatus=0xbff764d0) at nsGenericElement.cpp:2261
#27 0x00f977f1 in PresShell::HandleEventInternal (this=0xb3274b0, aEvent=0xbff7602c, aView=0x0, aFlags=1, aStatus=0xbff764d0) at nsPresShell.cpp:6523
#28 0x00f97d85 in PresShell::HandleEventWithTarget (this=0xb3274b0, aEvent=0xbff7602c, aFrame=0xc734568, aContent=0xc69d3c0, aFlags=1, aStatus=0xbff764d0)
    at nsPresShell.cpp:6419
#29 0x011a6332 in nsEventStateManager::CheckForAndDispatchClick (this=0xb00f0e0, aPresContext=0xb00ee10, aEvent=0xbff76670, aStatus=0xbff764d0)
    at nsEventStateManager.cpp:3206
#30 0x011ad169 in nsEventStateManager::PostHandleEvent (this=0xb00f0e0, aPresContext=0xb00ee10, aEvent=0xbff76670, aTargetFrame=0xc734568,
    aStatus=0xbff764d0, aView=0xc8610f8) at nsEventStateManager.cpp:2169
#31 0x00f97967 in PresShell::HandleEventInternal (this=0xb3274b0, aEvent=0xbff76670, aView=0xc8610f8, aFlags=513, aStatus=0xbff764d0)
    at nsPresShell.cpp:6595
#32 0x00f99d13 in PresShell::HandleEvent (this=0xb3274b0, aView=0xc8610f8, aEvent=0xbff76670, aEventStatus=0xbff764d0, aForceHandle=1,
    aHandled=@0xbff764c8) at nsPresShell.cpp:6358
#33 0x012b2029 in nsViewManager::HandleEvent (this=0xb00f6d0, aView=0xc8610f8, aEvent=0xbff76670, aCaptured=1) at nsViewManager.cpp:2564
#34 0x012b25a4 in nsViewManager::DispatchEvent (this=0xb00f6d0, aEvent=0xbff76670, aStatus=0xbff76630) at nsViewManager.cpp:2253
#35 0x012a5fe6 in HandleEvent (aEvent=0xbff76670) at nsView.cpp:171
#36 0x00409cbe in nsCommonWidget::DispatchEvent (this=0xc43e500, aEvent=0xbff76670, aStatus=@0xbff766b8) at nsCommonWidget.cpp:219
#37 0x00406cf6 in nsWindow::OnButtonReleaseEvent (this=0xc43e500, aWidget=0x978a258, aEvent=0x9498780) at nsWindow.cpp:1724
#38 0x00406d5b in button_release_event_cb (widget=0x978a258, event=0x9498780) at nsWindow.cpp:3921
#39 0x05a43434 in _gtk_marshal_BOOLEAN__BOXED (closure=0x98912d8, return_value=0xbff76860, n_param_values=2, param_values=0xbff7693c,
    invocation_hint=0xbff7684c, marshal_data=0x0) at gtkmarshalers.c:84
#40 0x0099ff83 in IA__g_closure_invoke (closure=0x98912d8, return_value=0xbff76860, n_param_values=2, param_values=0xbff7693c, invocation_hint=0xbff7684c)
    at gclosure.c:490
#41 0x009b048d in signal_emit_unlocked_R (node=0x95ab4e8, detail=0, instance=0x978a258, emission_return=0xbff76afc, instance_and_params=0xbff7693c)
    at gsignal.c:2440
#42 0x009b175f in IA__g_signal_emit_valist (instance=0x978a258, signal_id=30, detail=0, var_args=<value optimized out>) at gsignal.c:2209
#43 0x009b1b59 in IA__g_signal_emit (instance=0x978a258, signal_id=30, detail=0) at gsignal.c:2243
#44 0x05bcf494 in gtk_widget_event_internal (widget=0x978a258, event=0x9498780) at gtkwidget.c:4678
#45 0x05bcef98 in IA__gtk_widget_event (widget=0x978a258, event=0x9498780) at gtkwidget.c:4478
#46 0x05a417cb in IA__gtk_propagate_event (widget=0x978a258, event=0x9498780) at gtkmain.c:2336
#47 0x05a4010a in IA__gtk_main_do_event (event=0x9498780) at gtkmain.c:1556
#48 0x05d4260a in gdk_event_dispatch (source=0x9498978, callback=0, user_data=0x0) at gdkevents-x11.c:2351
#49 0x022021ac in IA__g_main_context_dispatch (context=0x949c8d0) at gmain.c:2061
#50 0x022055ef in g_main_context_iterate (context=0x949c8d0, block=1, dispatch=1, self=0x947b578) at gmain.c:2694
#51 0x02205999 in IA__g_main_loop_run (loop=0x99a55a0) at gmain.c:2898
#52 0x05a3f7ee in IA__gtk_main () at gtkmain.c:1163
#53 0x00408462 in nsAppShell::Run (this=0x95dca48) at nsAppShell.cpp:139
#54 0x00bec3f2 in nsAppStartup::Run (this=0x95dca08) at nsAppStartup.cpp:151
#55 0x0804f23c in XRE_main (argc=1, argv=0xbff77334, aAppData=0x80615e0) at nsAppRunner.cpp:2817
#56 0x0804abff in main (argc=) at nsBrowserApp.cpp:61
#57 0x00549390 in __libc_start_main (main=0x804abc0 <main>, argc=1, ubp_av=0xbff77334, init=0x805a4d0 <__libc_csu_init>,
    fini=0x805a4c0 <__libc_csu_fini>, rtld_fini=0x522940 <_dl_fini>, stack_end=0xbff7732c) at libc-start.c:220
#58 0x0804ab01 in _start ()
Missing separate debuginfos, use: debuginfo-install alsa-lib.i386 audiofile.i386 avahi.i386 dbus-glib.i386 dbus.i386 e2fsprogs.i386 esound.i386 expat.i386 gail.i386 gnome-keyring.i386 gtk-nodoka-engine.i386 keyutils.i386 krb5.i386 libXau.i386 libXcomposite.i386 libXcursor.i386 libXdmcp.i386 libXext.i386 libXfixes.i386 libXi.i386 libXrandr.i386 libcap.i386 libselinux.i386 libxcb.i386 libxml2.i386 openssl.i686
(gdb) frame 5
#5  0x01194ae7 in nsXMLHttpRequest::Send (this=0xc4438e0, aBody=0xcd3bea0) at nsXMLHttpRequest.cpp:1725
1725	        PR_Sleep(PR_MillisecondsToInterval(10));
(gdb) print method
$1 = {<nsFixedCString> = {<nsCString> = {<nsCSubstring> = {<nsACString_internal> = {mVTable = 0x20d5c08, mData = 0xbff74714 "POST", mLength = 4,
          mFlags = 65553}, <No data fields>}, <No data fields>}, mFixedCapacity = 63, mFixedBuf = 0xbff74714 "POST"},
  mStorage = "POST\000G���\vJ\000\200v \000����XG��W6\026\0008�R\t\r\000\000\000\210I��PG��\020%^\t��R\t\000\000\000\000\200v \000�\201�\v"}
(gdb) print mState
$2 = 2177
(gdb) print this
$3 = (nsXMLHttpRequest * const) 0xc4438e0
(gdb) q
The program is running.  Quit anyway (and detach it)? (y or n) Detaching from program: /usr/lib/firefox-2.0.0.14/firefox-bin, process 22152

Comment 1

[Boris Zbarsky [:bzbarsky]]

Attachment: Should fix this

> somehow NS_IMETHODIMP nsXMLHttpRequest::Abort()
> has been invoked, and since that method does not clear the:
> XML_HTTP_REQUEST_SYNCLOOPING flag, the code loops forever.

Good catch!  That would indeed have just such an effect.

Attached patch should fix that problem.

Comment 2

[Boris Zbarsky [:bzbarsky]]

Pushed changeset 799c3c643db1.  Vesselin, thanks for the excellent bug report!