[petsc-users] HashMap Error when populating AIJCUSPARSE matrix

[Yesypenko, Anna]

Dear Petsc users/developers,

I'm experiencing a bug when using petsc4py with GPU support. It may be my mistake in how I set up a AIJCUSPARSE matrix.
For larger matrices, I sometimes encounter a error in assigning matrix values; the error is thrown in PetscHMapIJVQuerySet().
Here is a minimum snippet that populates a sparse tridiagonal matrix.

```
from petsc4py import PETSc
from scipy.sparse import diags
import numpy as np

n = int(5e5);

nnz = 3 * np.ones(n, dtype=np.int32); nnz[0] = nnz[-1] = 2
A = PETSc.Mat(comm=PETSc.COMM_WORLD)
A.createAIJ(size=[n,n],comm=PETSc.COMM_WORLD,nnz=nnz)
A.setType('aijcusparse')
tmp = diags([-1,2,-1],[-1,0,+1],shape=(n,n)).tocsr()
A.setValuesCSR(tmp.indptr,tmp.indices,tmp.data)                            ####### this is the line where the error is thrown.
A.assemble()
```

The error trace is below:
```
File "petsc4py/PETSc/Mat.pyx", line 2603, in petsc4py.PETSc.Mat.setValuesCSR
  File "petsc4py/PETSc/petscmat.pxi", line 1039, in petsc4py.PETSc.matsetvalues_csr
  File "petsc4py/PETSc/petscmat.pxi", line 1032, in petsc4py.PETSc.matsetvalues_ijv
petsc4py.PETSc.Error: error code 76
[0] MatSetValues() at /work/06368/annayesy/ls6/petsc/src/mat/interface/matrix.c:1497
[0] MatSetValues_Seq_Hash() at /work/06368/annayesy/ls6/petsc/include/../src/mat/impls/aij/seq/seqhashmatsetvalues.h:52
[0] PetscHMapIJVQuerySet() at /work/06368/annayesy/ls6/petsc/include/petsc/private/hashmapijv.h:10
[0] Error in external library
[0] [khash] Assertion: `ret >= 0' failed.
```

If I run the same script a handful of times, it will run without errors eventually.
Does anyone have insight on why it is behaving this way? I'm running on a node with 3x NVIDIA A100 PCIE 40GB.

Thank you!
Anna
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