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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - False Positive PthreadLockChecker Use destroyed lock"
href="https://bugs.llvm.org/show_bug.cgi?id=32455">32455</a>
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<th>Summary</th>
<td>False Positive PthreadLockChecker Use destroyed lock
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
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<th>Reporter</th>
<td>xiangzhai83@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hi LLVM developers,
Testcase: libburn
<a href="https://dev.lovelyhq.com/libburnia/libburn/blob/master/libburn/libdax_msgs.c#L209">https://dev.lovelyhq.com/libburnia/libburn/blob/master/libburn/libdax_msgs.c#L209</a>
208 #ifndef LIBDAX_MSGS_SINGLE_THREADED
209 if(pthread_mutex_destroy(&(o->lock_mutex))!=0) {
^
Assuming the condition is true
^
Taking true branch
210 pthread_mutex_unlock(&(o->lock_mutex));
^
This lock has already been destroyed
211 pthread_mutex_destroy(&(o->lock_mutex));
212 }
213 #endif
But if the return value of pthread_mutex_destroy is NOT 0
<a href="https://github.molgen.mpg.de/git-mirror/glibc/blob/master/nptl/pthread_mutex_destroy.c#L32">https://github.molgen.mpg.de/git-mirror/glibc/blob/master/nptl/pthread_mutex_destroy.c#L32</a>
then mutex->__data.__kind will not be set! so it might be still able to use
pthread_mutex_unlock to set mutex object's members
<a href="https://github.molgen.mpg.de/git-mirror/glibc/blob/master/nptl/pthread_mutex_unlock.c#L49">https://github.molgen.mpg.de/git-mirror/glibc/blob/master/nptl/pthread_mutex_unlock.c#L49</a>
Regards,
Leslie Zhai</pre>
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