Bug 18621 – GtkLauncher calls g_object_unref() on NULL pointers

• Status: RESOLVED
• Resolution: INVALID
• Component: WebKitGTK

[Sebastian Dröge (slomo)]

Hi,
when changing the currently displayed page to another one by entering a new URL one gets assertions like:

GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed


Backtrace is:

Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb5a6a740 (LWP 11791)]
0xffffe410 in __kernel_vsyscall ()
(gdb) bt
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb762def5 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb762f871 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb71e1ab9 in IA__g_logv (log_domain=0xb728306b "GLib-GObject", log_level=G_LOG_LEVEL_CRITICAL, 
    format=0xb7216f08 "%s: assertion `%s' failed", args1=0xbfdfa21c "�H(��;(�P
    at /build/buildd/glib2.0-2.16.3/glib/gmessages.c:497
#4  0xb71e1ae9 in IA__g_log (log_domain=0xb728306b "GLib-GObject", log_level=G_LOG_LEVEL_CRITICAL, 
    format=0xb7216f08 "%s: assertion `%s' failed") at /build/buildd/glib2.0-2.16.3/glib/gmessages.c:517
#5  0xb71e1d2b in IA__g_return_if_fail_warning (log_domain=0xb728306b "GLib-GObject", 
    pretty_function=0xb72848ca "g_object_unref", expression=0xb7283bd1 "G_IS_OBJECT (object)")
    at /build/buildd/glib2.0-2.16.3/glib/gmessages.c:532
#6  0xb725d7ca in IA__g_object_unref (_object=0x0) at /build/buildd/glib2.0-2.16.3/gobject/gobject.c:1742
#7  0xb7841575 in WebKit::FrameLoaderClient::detachedFromParent4 (this=0xb5768438)
    at ../WebKit/gtk/WebCoreSupport/FrameLoaderClientGtk.cpp:461
#8  0xb7b342bf in WebCore::FrameLoader::detachFromParent (this=0xb51e4c80)
    at ../WebCore/loader/FrameLoader.cpp:3302
#9  0xb7acaddc in WebCore::HTMLFrameOwnerElement::willRemove (this=0xb55b2750)
    at ../WebCore/html/HTMLFrameOwnerElement.cpp:46
#10 0xb79f3d4b in WebCore::ContainerNode::willRemove (this=0xb51e15e8)
    at ../WebCore/dom/ContainerNode.cpp:347
#11 0xb79f3d4b in WebCore::ContainerNode::willRemove (this=0xb53a7990)
    at ../WebCore/dom/ContainerNode.cpp:347
#12 0xb79f3d4b in WebCore::ContainerNode::willRemove (this=0xb577d5e8)
    at ../WebCore/dom/ContainerNode.cpp:347
#13 0xb79f3d4b in WebCore::ContainerNode::willRemove (this=0xb5783700)
    at ../WebCore/dom/ContainerNode.cpp:347
#14 0xb7b2446a in WebCore::FrameLoader::clear (this=0xb5769a00, clearWindowProperties=true, 
    clearScriptObjects=true) at ../WebCore/loader/FrameLoader.cpp:816
#15 0xb7b2457e in WebCore::FrameLoader::begin (this=0xb5769a00, url=@0xb5769b28, dispatch=false, 
    origin=0x0) at ../WebCore/loader/FrameLoader.cpp:911
#16 0xb7b31e5c in WebCore::FrameLoader::receivedFirstData (this=0xb5769a00)
    at ../WebCore/loader/FrameLoader.cpp:861
#17 0xb7b3226d in WebCore::FrameLoader::setEncoding (this=0xb5769a00, name=@0xbfdfa578, userChosen=false)
    at ../WebCore/loader/FrameLoader.cpp:1831
---Type <return> to continue, or q <return> to quit---
#18 0xb78428b6 in WebKit::FrameLoaderClient::finishedLoading (this=0xb5768e88, documentLoader=0xb5269000)
    at ../WebKit/gtk/WebCoreSupport/FrameLoaderClientGtk.cpp:609
#19 0xb7b353f3 in WebCore::FrameLoader::finishedLoadingDocument (this=0xb5769a00, loader=0xb5269000)
    at ../WebCore/loader/FrameLoader.cpp:2939
#20 0xb7b174c6 in WebCore::DocumentLoader::finishedLoading (this=0xb5269000)
    at ../WebCore/loader/DocumentLoader.cpp:317
#21 0xb7b2b3f4 in WebCore::FrameLoader::finishedLoading (this=0xb5769a00)
    at ../WebCore/loader/FrameLoader.cpp:2874
#22 0xb7b46df2 in WebCore::MainResourceLoader::didFinishLoading (this=0xb5251000)
    at ../WebCore/loader/MainResourceLoader.cpp:307
#23 0xb7b4d091 in WebCore::ResourceLoader::didFinishLoading (this=0xb5251000)
    at ../WebCore/loader/ResourceLoader.cpp:370
#24 0xb7c7428a in WebCore::ResourceHandleManager::downloadTimerCallback (this=0xb579bc60, 
    timer=0xb579bc60) at ../WebCore/platform/network/curl/ResourceHandleManager.cpp:340
#25 0xb7c749eb in WebCore::Timer<WebCore::ResourceHandleManager>::fired (this=0xb579bc60)
    at ../WebCore/platform/Timer.h:99
#26 0xb7bc9a4b in WebCore::TimerBase::fireTimers (fireTime=1208612341.6659219, firingTimers=@0xbfdfa8d4)
    at ../WebCore/platform/Timer.cpp:347
#27 0xb7bc9b47 in WebCore::TimerBase::sharedTimerFired () at ../WebCore/platform/Timer.cpp:368
#28 0xb785effe in timeout_cb () at ../WebCore/platform/gtk/SharedTimerGtk.cpp:48
#29 0xb71d6e01 in g_idle_dispatch (source=0x8215a58, callback=0, user_data=0x0)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:4087
#30 0xb71d8978 in IA__g_main_context_dispatch (context=0x806aa38)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2009
#31 0xb71dbbce in g_main_context_iterate (context=0x806aa38, block=1, dispatch=1, self=0x805ba00)
    at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2642
#32 0xb71dbf57 in IA__g_main_loop_run (loop=0x81f2810) at /build/buildd/glib2.0-2.16.3/glib/gmain.c:2850
#33 0xb73d3d04 in IA__gtk_main () at /tmp/buildd/gtk+2.0-2.12.9/gtk/gtkmain.c:1163
#34 0x08049a68 in main (argc=Cannot access memory at address 0x6
) at ../WebKitTools/GtkLauncher/main.c:200

[Alp Toker]

Which revision are you seeing this with? Any pages in particular, or any unusual configuration?

[Alp Toker]

This was fixed a couple of weeks ago in r31841. It'd be useful to mention the SVN revision next in future.

Cheers