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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - interceptors for __pthread_mutex_(un)lock should wrap __pthread_mutex_lock but actually call pthread_mutex_lock"
href="https://bugs.llvm.org/show_bug.cgi?id=41095">41095</a>
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<th>Summary</th>
<td>interceptors for __pthread_mutex_(un)lock should wrap __pthread_mutex_lock but actually call pthread_mutex_lock
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>asan
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>roc@ocallahan.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre><a href="https://github.com/llvm-project/llvm-project-20170507/commit/0a6efb6b61cba4040646e634c89c81ce38512d4d#diff-84c56a2db2415e80a9250fcf8679f462R4057">https://github.com/llvm-project/llvm-project-20170507/commit/0a6efb6b61cba4040646e634c89c81ce38512d4d#diff-84c56a2db2415e80a9250fcf8679f462R4057</a>
#if SANITIZER_INTERCEPT___PTHREAD_MUTEX
INTERCEPTOR(int, __pthread_mutex_lock, void *m) {
return WRAP(pthread_mutex_lock)(m);
}
This doesn't look right to me. I think it should call
WRAP(__pthread_mutex_lock).
This matters in practice because rr wraps pthread_mutex_lock to modify mutex
state and then call __pthread_mutex_lock. When recording an ASAN application,
ASAN intercepts __pthread_mutex_lock to delegate to pthread_mutex_lock, which
ends up back at rr's override. So we're in an infinite loop.</pre>
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