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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Race condition in ASAN with detached threads."
href="http://llvm.org/bugs/show_bug.cgi?id=21621">21621</a>
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<th>Summary</th>
<td>Race condition in ASAN with detached threads.
</td>
</tr>
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<th>Product</th>
<td>compiler-rt
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>compiler-rt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>eric@efcs.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>There seems to be a race condition between when ASAN checks for leaks and when
detached threads exit and free their resources. For example the below test
detects a leak with both libc++ and libstdc++. However when the main thread
waits for the spawned thread to exit no leak is detected.
// clang++ -std=c++11 -fsanitize=address -lpthread test.cpp
#include <thread>
#include <chrono>
void func()
{
std::this_thread::sleep_for(std::chrono::milliseconds(500));
}
int main() {
std::thread(func).detach();
// Enable to see ASAN pass.
//std::this_thread::sleep_for(std::chrono::milliseconds(600));
}</pre>
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</p>
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