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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Threaded Compositor] ASSERTION FAILED: isMainThread() when ThreadedCompositor is destroyed since r203718"
href="https://bugs.webkit.org/show_bug.cgi?id=160197">160197</a>
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<tr>
<th>Summary</th>
<td>[Threaded Compositor] ASSERTION FAILED: isMainThread() when ThreadedCompositor is destroyed since r203718
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Local Build
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>Gtk
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
</tr>
<tr>
<th>Component</th>
<td>WebKit2
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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</tr>
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<th>Reporter</th>
<td>cgarcia@igalia.com
</td>
</tr>
<tr>
<th>CC</th>
<td>bugs-noreply@webkitgtk.org
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</tr></table>
<p>
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<pre>ThreadedCompositor can be destroyed from a secondary thread, for example, when a task takes a reference and the main threads derefs it, when the task finishes in the secondary thread the lambda ends up deleting the threaded compositor. This is ok for the Threaded compositor but not for the CompositingRunLoop class. this was not a problem before r203718 because the CompositingRunLoop object was created and destroyed in the same thread always, but now it's part of the ThreadedCompositor class. This makes me think whether we really want this to happen, maybe instead of taking references, we should use weak pointers, but for now let's make sure the CompositingRunLoop is always created and destroyed in the main thread.
STDERR: ASSERTION FAILED: isMainThread()
STDERR: ../../Source/WebKit2/Shared/CoordinatedGraphics/threadedcompositor/CompositingRunLoop.cpp(44) : static WebKit::WorkQueuePool& WebKit::WorkQueuePool::singleton()
STDERR: 1 0x7fb8ba53ec2f /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(WTFCrash+0x1e) [0x7fb8ba53ec2f]
STDERR: 2 0x7fb8c104ce67 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::WorkQueuePool::singleton()+0x37) [0x7fb8c104ce67]
STDERR: 3 0x7fb8c104c37b /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::CompositingRunLoop::~CompositingRunLoop()+0x11) [0x7fb8c104c37b]
STDERR: 4 0x7fb8c10503ae /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::ThreadedCompositor::~ThreadedCompositor()+0x72) [0x7fb8c10503ae]
STDERR: 5 0x7fb8c1050426 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebKit::ThreadedCompositor::~ThreadedCompositor()+0x18) [0x7fb8c1050426]
STDERR: 6 0x7fb8c1058d90 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WTF::ThreadSafeRefCounted<WebKit::ThreadedCompositor>::deref()+0x48) [0x7fb8c1058d90]
STDERR: 7 0x7fb8c1057f79 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WTF::Ref<WebKit::ThreadedCompositor>::~Ref()+0x2b) [0x7fb8c1057f79]
STDERR: 8 0x7fb8c10504ac /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x58664ac) [0x7fb8c10504ac]
STDERR: 9 0x7fb8c1054baa /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x586abaa) [0x7fb8c1054baa]
STDERR: 10 0x7fb8c1054be6 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x586abe6) [0x7fb8c1054be6]
STDERR: 11 0x7fb8c0a44b38 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::default_delete<WTF::Function<void ()>::CallableWrapperBase>::operator()(WTF::Function<void ()>::CallableWrapperBase*) const+0x2e) [0x7fb8c0a44b38]
STDERR: 12 0x7fb8c0a42ab9 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::unique_ptr<WTF::Function<void ()>::CallableWrapperBase, std::default_delete<WTF::Function<void ()>::CallableWrapperBase> >::~unique_ptr()+0x47) [0x7fb8c0a42ab9]
STDERR: 13 0x7fb8c0a41a3c /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WTF::Function<void ()>::~Function()+0x18) [0x7fb8c0a41a3c]
STDERR: 14 0x7fb8c104c4b4 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x58624b4) [0x7fb8c104c4b4]
STDERR: 15 0x7fb8c104cca0 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x5862ca0) [0x7fb8c104cca0]
STDERR: 16 0x7fb8c104ccdc /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x5862cdc) [0x7fb8c104ccdc]
STDERR: 17 0x7fb8c0a44b38 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::default_delete<WTF::Function<void ()>::CallableWrapperBase>::operator()(WTF::Function<void ()>::CallableWrapperBase*) const+0x2e) [0x7fb8c0a44b38]
STDERR: 18 0x7fb8c0a42ab9 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::unique_ptr<WTF::Function<void ()>::CallableWrapperBase, std::default_delete<WTF::Function<void ()>::CallableWrapperBase> >::~unique_ptr()+0x47) [0x7fb8c0a42ab9]
STDERR: 19 0x7fb8c0a41a3c /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WTF::Function<void ()>::~Function()+0x18) [0x7fb8c0a41a3c]
STDERR: 20 0x7fb8ba59af24 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x227ef24) [0x7fb8ba59af24]
STDERR: 21 0x7fb8ba59bd9c /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x227fd9c) [0x7fb8ba59bd9c]
STDERR: 22 0x7fb8ba59bdd8 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x227fdd8) [0x7fb8ba59bdd8]
STDERR: 23 0x7fb8c0a44b38 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::default_delete<WTF::Function<void ()>::CallableWrapperBase>::operator()(WTF::Function<void ()>::CallableWrapperBase*) const+0x2e) [0x7fb8c0a44b38]
STDERR: 24 0x7fb8c0a42ab9 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(std::unique_ptr<WTF::Function<void ()>::CallableWrapperBase, std::default_delete<WTF::Function<void ()>::CallableWrapperBase> >::~unique_ptr()+0x47) [0x7fb8c0a42ab9]
STDERR: 25 0x7fb8c0a41a3c /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WTF::Function<void ()>::~Function()+0x18) [0x7fb8c0a41a3c]
STDERR: 26 0x7fb8ba55a49e /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(WTF::RunLoop::performWork()+0xe8) [0x7fb8ba55a49e]
STDERR: 27 0x7fb8ba59d2be /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x22812be) [0x7fb8ba59d2be]
STDERR: 28 0x7fb8ba59d2e3 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x22812e3) [0x7fb8ba59d2e3]
STDERR: 29 0x7fb8ba59d25e /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x228125e) [0x7fb8ba59d25e]
STDERR: 30 0x7fb8ba59d28d /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(+0x228128d) [0x7fb8ba59d28d]
STDERR: 31 0x7fb8b6001a26 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/DependenciesGTK/Root/lib/libglib-2.0.so.0(+0x53a26) [0x7fb8b6001a26]</pre>
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