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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 - Thread Safety Analysis: false positive on const auto scoped_lock variable"
href="https://bugs.llvm.org/show_bug.cgi?id=43826">43826</a>
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<th>Summary</th>
<td>Thread Safety Analysis: false positive on const auto scoped_lock variable
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</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>
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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>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>adi@thingdust.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
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<pre>$ cat main.cpp
#include <mutex>
static std::mutex guard;
int main() { const auto lock = std::scoped_lock{guard}; }
$ clang++ -std=c++17 -D_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS -Wthread-safety
main.cpp
main.cpp:5:57: warning: releasing mutex 'lock' that was not held
[-Wthread-safety-analysis]
int main() { const auto lock = std::scoped_lock{guard}; }
^
1 warning generated.
when the variable is "auto lock" instead of "const auto lock", then no warning
is generated.</pre>
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