[Webkit-unassigned] [Bug 167946] New: [GStreamer] ASSERTION FAILED: m_boundThread == currentThread() in _WebKitWebSrcPrivate::~_WebKitWebSrcPrivate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167946

            Bug ID: 167946
           Summary: [GStreamer] ASSERTION FAILED: m_boundThread ==
                    currentThread() in
                    _WebKitWebSrcPrivate::~_WebKitWebSrcPrivate
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 300825
  --> https://bugs.webkit.org/attachment.cgi?id=300825&action=review
Full backtrace

This is probably a follow-up bug to bug #167003:

 * Load http://www.riverfronttimes.com/newsblog/2017/02/07/unions-seek-to-block-missouri-right-to-work-referendum-vote-likely-this-fall
 * Scroll down
 * Crash

Full backtrace attached. Truncated:

Thread 1 (Thread 0x7fb124c12ac0 (LWP 20285)):
#0  0x00007fb1164565ec in WTFCrash ()
    at ../../Source/WTF/wtf/Assertions.cpp:323
No locals.
#1  0x00007fb11ff37828 in WTF::WeakReference<WebCore::MainThreadNotifier<MainThreadSourceNotification> >::clear (this=0x7fb0aa3d4210)
    at ../../Source/WTF/wtf/WeakPtr.h:65
        __PRETTY_FUNCTION__ = "void WTF::WeakReference<T>::clear() [with T = WebCore::MainThreadNotifier<MainThreadSourceNotification>]"
#2  0x00007fb11ff369c8 in WTF::WeakPtrFactory<WebCore::MainThreadNotifier<MainThreadSourceNotification> >::~WeakPtrFactory (this=0xd0a00c8, 
    __in_chrg=<optimized out>) at ../../Source/WTF/wtf/WeakPtr.h:122
No locals.
#3  0x00007fb11ff3653a in (anonymous namespace)::MainThreadNotifier<MainThreadSourceNotification>::~MainThreadNotifier (this=0xd0a00c8, 
    __in_chrg=<optimized out>)
    at ../../Source/WebCore/platform/graphics/gstreamer/MainThreadNotifier.h:30
No locals.
#4  0x00007fb11ff365f2 in _WebKitWebSrcPrivate::~_WebKitWebSrcPrivate (
    this=0xd0a0040, __in_chrg=<optimized out>)
    at ../../Source/WebCore/platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:132
No locals.
#5  0x00007fb11ff2cc16 in webKitWebSrcFinalize (object=0xd0a0100)
    at ../../Source/WebCore/platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:331
        src = 0xd0a0100
        priv = 0xd0a0040

Looks like another thread-safety bug in the _WebKitWebSrcPrivate destructor. Note: bug #152043 looks related.

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