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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ThreadSanitizer: Data race and thread leak in WebCore::ScrollingThread::createThreadIfNeeded"
href="https://bugs.webkit.org/show_bug.cgi?id=157462">157462</a>
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<th>Summary</th>
<td>ThreadSanitizer: Data race and thread leak in WebCore::ScrollingThread::createThreadIfNeeded
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Nightly Build
</td>
</tr>
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<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
</tr>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>WebCore Misc.
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ddkilzer@webkit.org
</td>
</tr>
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<th>CC</th>
<td>ap@webkit.org, koivisto@iki.fi, simon.fraser@apple.com
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</tr></table>
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<pre>ThreadSanitizer has found a data race and thread leak in WebCore::ScrollingThread::createThreadIfNeeded while running layout tests:
CRASHING TEST: compositing/layer-creation/translate-scale-animation-overlap.html
==65095==
==================
WARNING: ThreadSanitizer: data race (pid=65095)
Write of size 8 at 0x000110863150 by thread T12:
#0 WebCore::ScrollingThread::initializeRunLoop() <null> (WebCore+0x00000174e78e)
#1 WebCore::ScrollingThread::threadCallback(void*) <null> (WebCore+0x00000174e0f0)
#2 WTF::threadEntryPoint(void*) <null> (JavaScriptCore+0x000000a06801)
Previous read of size 8 at 0x000110863150 by main thread:
#0 WebCore::ScrollingThread::createThreadIfNeeded() <null> (WebCore+0x00000174de3b)
#1 WebCore::ScrollingThread::dispatch(std::__1::function<void ()>) <null> (WebCore+0x00000174dc2a)
#2 WebCore::MemoryPressureHandler::releaseMemory(WebCore::Critical, WebCore::Synchronous) <null> (WebCore+0x0000012d3c93)
#3 std::__1::__function::__func<WebCore::MemoryPressureHandler::MemoryPressureHandler()::$_0, std::__1::allocator<WebCore::MemoryPressureHandler::MemoryPressureHandler()::$_0>, void (WebCore::Critical, WebCore::Synchronous)>::operator()(WebCore::Critical&&, WebCore::Synchronous&&) <null> (WebCore+0x0000012d40a9)
#4 WebCore::MemoryPressureHandler::respondToMemoryPressure(WebCore::Critical, WebCore::Synchronous) <null> (WebCore+0x0000012d4c26)
#5 invocation function for block in WebCore::MemoryPressureHandler::install() <null> (WebCore+0x0000012d4b60)
#6 __wrap_dispatch_source_set_event_handler_block_invoke <null> (libclang_rt.tsan_osx_dynamic.dylib+0x00000005c7e2)
Location is global 'WebCore::ScrollingThread::singleton()::scrollingThread' at 0x000110863138 (WebCore+0x0000020d1150)
Thread T12 (tid=1603665, running) created by main thread at:
#0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib+0x0000000230c1)
#1 WTF::createThreadInternal(void (*)(void*), void*, char const*) <null> (JavaScriptCore+0x000000a06b4d)
#2 WebCore::ScrollingThread::dispatch(std::__1::function<void ()>) <null> (WebCore+0x00000174dc2a)
#3 WebCore::MemoryPressureHandler::releaseMemory(WebCore::Critical, WebCore::Synchronous) <null> (WebCore+0x0000012d3c93)
#4 std::__1::__function::__func<WebCore::MemoryPressureHandler::MemoryPressureHandler()::$_0, std::__1::allocator<WebCore::MemoryPressureHandler::MemoryPressureHandler()::$_0>, void (WebCore::Critical, WebCore::Synchronous)>::operator()(WebCore::Critical&&, WebCore::Synchronous&&) <null> (WebCore+0x0000012d40a9)
#5 WebCore::MemoryPressureHandler::respondToMemoryPressure(WebCore::Critical, WebCore::Synchronous) <null> (WebCore+0x0000012d4c26)
#6 invocation function for block in WebCore::MemoryPressureHandler::install() <null> (WebCore+0x0000012d4b60)
#7 __wrap_dispatch_source_set_event_handler_block_invoke <null> (libclang_rt.tsan_osx_dynamic.dylib+0x00000005c7e2)
SUMMARY: ThreadSanitizer: data race (OpenSource/WebKitBuild/Release/WebCore.framework/Versions/A/WebCore+0x174e78e) in WebCore::ScrollingThread::initializeRunLoop()
==================
==================
WARNING: ThreadSanitizer: thread leak (pid=65095)
Thread T10 (tid=1603424, finished) created by main thread at:
#0 pthread_create <null> (libclang_rt.tsan_osx_dynamic.dylib+0x0000000230c1)
#1 WTF::createThreadInternal(void (*)(void*), void*, char const*) <null> (JavaScriptCore+0x000000a06b4d)
SUMMARY: ThreadSanitizer: thread leak (OpenSource/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore+0xa06b4d) in WTF::createThreadInternal(void (*)(void*), void*, char const*)
==================
ThreadSanitizer: reported 2 warnings</pre>
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