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Dear Petsc users/developers,</div>
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<br>
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I'm experiencing a bug when using petsc4py with GPU support. It may be my mistake in how I set up a AIJCUSPARSE matrix.</div>
<div class="elementToProof"><span style="letter-spacing: normal; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-weight: 400;">For
larger matrices, I sometimes encounter a error in assigning matrix values; the error is thrown in PetscHMapIJVQuerySet().</span></div>
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Here is a minimum snippet that populates a sparse tridiagonal matrix. </div>
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<br>
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```</div>
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from petsc4py import PETSc</div>
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from scipy.sparse import diags</div>
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import numpy as np</div>
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<br>
</div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">n = int(5e5); </span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"><br>
</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">nnz = 3 * np.ones(n, dtype=np.int32); nnz[0] = nnz[-1] = 2</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A = PETSc.Mat(comm=PETSc.COMM_WORLD)</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A.createAIJ(size=[n,n],comm=PETSc.COMM_WORLD,nnz=nnz)</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A.setType('aijcusparse')</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">tmp = diags([-1,2,-1],[-1,0,+1],shape=(n,n)).tocsr()</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A.setValuesCSR(tmp.indptr,tmp.indices,tmp.data) ####### this
is the line where the error is thrown.</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">A.assemble()</span></div>
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```</div>
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<br>
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The error trace is below:</div>
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```</div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">File "petsc4py/PETSc/Mat.pyx", line 2603, in petsc4py.PETSc.Mat.setValuesCSR</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> File "petsc4py/PETSc/petscmat.pxi", line 1039, in petsc4py.PETSc.matsetvalues_csr</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> File "petsc4py/PETSc/petscmat.pxi", line 1032, in petsc4py.PETSc.matsetvalues_ijv</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">petsc4py.PETSc.Error: error code 76</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">[0] MatSetValues() at /work/06368/annayesy/ls6/petsc/src/mat/interface/matrix.c:1497</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">[0] MatSetValues_Seq_Hash() at /work/06368/annayesy/ls6/petsc/include/../src/mat/impls/aij/seq/seqhashmatsetvalues.h:52</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">[0] PetscHMapIJVQuerySet() at /work/06368/annayesy/ls6/petsc/include/petsc/private/hashmapijv.h:10</span></div>
<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">[0] Error in external library</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">[0] [khash] Assertion: `ret >= 0' failed.</span></div>
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```</div>
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<br>
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If I run the same script a handful of times, it will run without errors eventually.</div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Does anyone have insight on why it is behaving this way? I'm running on a node with
3x NVIDIA A100 PCIE 40GB.</span></div>
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</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Thank you!</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Anna</span></div>
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