[Core] Failure in test_sparse_matrices.py

[jrubiogonzalez]

I'm finding a very strange error inside test_sparse_matrices.test_matrix_assembly. It only fails inside my WSL, on Windows it is ok, in our CI it runs ok. It is only failing in this machine.

`

FAIL: test_matrix_assembly (main.TestSparseMatrixInterface)

Traceback (most recent call last):
File "/home/jrubio/dev/Poesis/kratos/kratos/tests/test_sparse_matrices.py", line 97, in test_matrix_assembly
self.assertEqual(B.value_data()[i], validation_data[i])
AssertionError: np.float64(2.0) != -3.0

---

`

This is the error I get for this modified code to write the outputs:

And this is the output.
`
This is B:----------------------------------
CsrMatrix
size1 : 3
size2 : 3
nnz : 9
index1_data :
0,3,6,9,
index2_data :
0,1,2,0,1,2,0,1,2,
value_data :
2,-3,1,-3,6,-3,1,-3,2,

size1 : 3
size2 : 3
nnz : 9
index1_data :
0,3,6,9,
index2_data :
0,1,2,0,1,2,0,1,2,
value_data :
2,-3,1,-3,6,-3,1,-3,2,

This is B.value_data():----------------------------------
[2. 2. 2. 2. 2. 2. 2. 2. 2.]
%i : 0
[2. 2. 2. 2. 2. 2. 2. 2. 2.]
[2.0, -3.0, 1.0, -3.0, 6.0, -3.0, 1.0, -3.0, 2.0]
[0 0 0 0 0 0 0 0 0]
[0, 1, 2, 0, 1, 2, 0, 1, 2]
%i : 1
[2. 2. 2. 2. 2. 2. 2. 2. 2.]
[2.0, -3.0, 1.0, -3.0, 6.0, -3.0, 1.0, -3.0, 2.0]
[0 0 0 0 0 0 0 0 0]
[0, 1, 2, 0, 1, 2, 0, 1, 2]
F.
`

For some reason when you access through value_data() the output is not right.

As I said in other machines with different version it works OK, so it looks like some library bug. I'm adding it here for the record just in case somebody finds a similar issue.

[matekelemen]

sounds similar to what @roigcarlo has been hunting

[roigcarlo]

yep, its suspiciously similar to what we are facing in our CI. I link the PR for reference #12528

[RiccardoRossi]

do you have access to the machine? If so, could you give us debug access?? we are very lost at why this happens

[roigcarlo]

Also, worth to mention that I faced a similar issue in the past when trying to run tests with mismatching versions of the core and applications (in my partiuclar case was Kratos core + Linear Solvers application). so maybe its worth a check.