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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Tasking: assertion failure in kmp_runtime.c"
href="https://bugs.llvm.org/show_bug.cgi?id=36720">36720</a>
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<th>Summary</th>
<td>Tasking: assertion failure in kmp_runtime.c
</td>
</tr>
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<th>Product</th>
<td>OpenMP
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</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>
<tr>
<th>Reporter</th>
<td>grokos@us.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Tested on x86_64 and ppc64le, RHEL.
The following code triggers an assertion failure:
#define N 1024
int main()
{
#pragma omp task
{
#pragma omp parallel for
for (int i=0; i<N; i++)
(void) 0;
}
#pragma omp task
{
#pragma omp parallel for
for(int i=0; i<N; ++i)
(void) 0;
}
#pragma omp taskwait
return 0;
}
Assertion failure at kmp_runtime.cpp(1715): nthreads > 0.
OMP: Error #13: Assertion failure at kmp_runtime.cpp(1715).
The assertion fails even with OMP_NUM_THREADS=1. If I remove the second task,
everything runs to completion. If I remove the "omp parallel for" directives
from inside the tasks, once again everything runs fine.</pre>
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