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9230c978a1
```c
_Pragma( "omp parallel num_threads(n_threads)" )
{
// ... thread work ...
// Free the current thread's thrinfo_t structure.
bli_l3_thrinfo_free( rntm_p, thread ); // Line 183
}
// *** MISSING BARRIER HERE! ***
// Check the array_t back into the small block allocator...
bli_sba_checkin_array( array ); // Line 200
```
```c
// DANGEROUS execution timeline:
Thread 0 (chief):
completes func()
calls bli_l3_cntl_free()
calls bli_l3_thrinfo_free() → frees gl_comm ✓
exits OpenMP parallel region
calls bli_sba_checkin_array(array) → frees array ✗
Thread 1,2,3 (still executing):
still in func() or bli_l3_cntl_free()
trying to access freed gl_comm → CRASH!
trying to access freed array pools → CRASH!
```
This is **exactly the same issue** that PR #702 fixed in other files! The function needs a barrier before threads exit the parallel region to ensure:
1. **All threads complete their work** before any cleanup starts
2. **Global communicator isn't freed** while other threads are using it
3. **Array pools aren't freed** while other threads are accessing them