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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Possible access to freed stack memory in __kmpc_omp_wait_deps"
href="https://bugs.llvm.org/show_bug.cgi?id=49723">49723</a>
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<th>Summary</th>
<td>Possible access to freed stack memory in __kmpc_omp_wait_deps
</td>
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<th>Product</th>
<td>OpenMP
</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>
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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>Runtime Library
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>protze@itc.rwth-aachen.de
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>As reported in <a href="https://reviews.llvm.org/D96893">https://reviews.llvm.org/D96893</a>, the test
openmp/runtime/test/ompt/tasks/task_if0-depend.c leads to an assertion, when
the runtime is built in debug mode (the test triggers a KMP_DEBUG_ASSERT).
Adding `KMP_ASSERT(node.dn.nrefs==1);` at the end of the `__kmpc_omp_wait_deps`
function reveals, that some depnodes still have references to the depnode
representing the task if0 dependency node. These depnodes will try to release
the stack-allocated depnode object, after it was destroyed by returning from
`__kmpc_omp_wait_deps`.
It might be necessary to replace the stack allocation by heap allocation.</pre>
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