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            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - void ThreadTimers::sharedTimerFiredInternal() is not thread safe...."
   href="https://bugs.webkit.org/show_bug.cgi?id=164442#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED INVALID - void ThreadTimers::sharedTimerFiredInternal() is not thread safe...."
   href="https://bugs.webkit.org/show_bug.cgi?id=164442">bug 164442</a>
              from <span class="vcard"><a class="email" href="mailto:milarson&#64;nvidia.com" title="milarson&#64;nvidia.com">milarson&#64;nvidia.com</a>
</span></b>
        <pre>Yes that is the radar, we are seeing a double release coming up from webkit, but its now more likely from QuartzCore over releasing a metal context

==&gt; 50 GeForceMTLDriver: -[NVMTLRenderPipelineState dealloc] &lt;==
          50 QuartzCore: CA::OGL::metal_delete_state(CA::OGL::MetalPipeState*, CA::OGL::MetalPipeState*, void*)
            50 QuartzCore: x_hash_table_foreach
              50 QuartzCore: CA::OGL::MetalContext::purge_shaders()
                50 QuartzCore: CA::OGL::MetalContext::purge(bool)
                  50 QuartzCore: CA::CG::Renderer::invalidate_context()
                    50 QuartzCore: CA::CG::IOSurfaceRenderer::~IOSurfaceRenderer()
                      50 QuartzCore: CA::CG::IOSurfaceRenderer::~IOSurfaceRenderer()
                        50 QuartzCore: CA::CG::IOSurfaceRenderer::will_suspend_callback(void*)
                          50 libdispatch.dylib: _dispatch_client_callout
                            50 libdispatch.dylib: _dispatch_barrier_sync_f_invoke
                              34 QuartzCore: CA::Render::post_notification(CA::Render::NotificationName, CA::Render::Object*, void*, bool)
                              | 34 QuartzCore: CABackingStoreCollectBlocking
                              |   34 WebCore: WebCore::ThreadTimers::sharedTimerFiredInternal()
                              |     34 WebCore: WebCore::timerFired(__CFRunLoopTimer*, void*)
                              |       34 CoreFoundation: __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__</pre>
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