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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segfault when running nested parallels"
href="https://bugs.llvm.org/show_bug.cgi?id=50519">50519</a>
</td>
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<tr>
<th>Summary</th>
<td>Segfault when running nested parallels
</td>
</tr>
<tr>
<th>Product</th>
<td>OpenMP
</td>
</tr>
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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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Runtime Library
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rpenacob@bsc.es
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I've got a segfault when running the following code. It does not always fail
though.
int main() {
int j_size = 20;
int k_size = 20;
#pragma omp parallel num_threads(4)
{
#pragma omp parallel num_threads(2)
for(int j=0; j<j_size; j++){
#pragma omp task
for(int k=0; k<k_size; k++){
}
}
}
}
I've compiled with 59a4ee97288b commit with Debug.
To compile: clang -fopenmp t1.c -o t1
To execute:
export OMP_MAX_ACTIVE_LEVELS=2
for i in {0..100}; do ./t1 ; done
And I see one thread is freeing a team in
<a href="https://github.com/llvm/llvm-project/blob/main/openmp/runtime/src/kmp_runtime.cpp#L2496">https://github.com/llvm/llvm-project/blob/main/openmp/runtime/src/kmp_runtime.cpp#L2496</a>
that is being used by other thread in
<a href="https://github.com/llvm/llvm-project/blob/main/openmp/runtime/src/kmp_tasking.cpp#L2788">https://github.com/llvm/llvm-project/blob/main/openmp/runtime/src/kmp_tasking.cpp#L2788</a></pre>
</div>
</p>
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