mpi4py: Regression in spawn tests

[dalcinl]

There is a new mpi4py regression with current main branch [link], the automated build that ran last week was OK.

Output from one of the failing tests:

testArgsOnlyAtRoot (test_spawn.TestSpawnMultipleSelf) ... [fv-az741-240:130284] PMIX ERROR: NOT_AVAILABLE in file pmix_shmem.c at line 124
[fv-az741-240:130284] PMIX ERROR: ERROR in file gds_shmem.c at line 730
[fv-az741-240:130284] PMIX ERROR: ERROR in file gds_shmem.c at line 802
[fv-az741-240:130284] PMIX ERROR: ERROR in file gds_shmem.c at line 1589
[fv-az741-240:130284] PMIX ERROR: ERROR in file gds_shmem.c at line 1829
[fv-az741-240:130284] PMIX ERROR: UNPACK-FAILURE in file gds_shmem.c at line 1848
[fv-az741-240:130284] PMIX ERROR: UNPACK-FAILURE in file client/pmix_client_fence.c at line 206
[fv-az741-240:130283] PMIX ERROR: NOT_AVAILABLE in file pmix_shmem.c at line 124
[fv-az741-240:130283] PMIX ERROR: ERROR in file gds_shmem.c at line 730
[fv-az741-240:130283] PMIX ERROR: ERROR in file gds_shmem.c at line 802
[fv-az741-240:130283] PMIX ERROR: ERROR in file gds_shmem.c at line 1589
[fv-az741-240:130283] PMIX ERROR: ERROR in file gds_shmem.c at line 1829
[fv-az741-240:130283] PMIX ERROR: UNPACK-FAILURE in file gds_shmem.c at line 1848
[fv-az741-240:130283] PMIX ERROR: UNPACK-FAILURE in file client/pmix_client_fence.c at line 206
[fv-az741-240:130282] PMIX ERROR: NOT_AVAILABLE in file pmix_shmem.c at line 124
[fv-az741-240:130282] PMIX ERROR: ERROR in file gds_shmem.c at line 730
[fv-az741-240:130282] PMIX ERROR: ERROR in file gds_shmem.c at line 802
[fv-az741-240:130282] PMIX ERROR: ERROR in file gds_shmem.c at line 1589
[fv-az741-240:130282] PMIX ERROR: ERROR in file gds_shmem.c at line 1829
[fv-az741-240:130282] PMIX ERROR: UNPACK-FAILURE in file gds_shmem.c at line 1848
[fv-az741-240:130282] PMIX ERROR: UNPACK-FAILURE in file client/pmix_client_fence.c at line 206
[fv-az741-240:130284] OPAL ERROR: File write failure in file dpm/dpm.c at line 652
Traceback (most recent call last):
  File "/home/runner/work/mpi4py-testing/mpi4py-testing/mpi4py/test/spawn_child.py", line 7, in <module>
    parent.Disconnect()
  File "mpi4py/MPI/Comm.pyx", line 1619, in mpi4py.MPI.Comm.Disconnect
mpi4py.MPI.Exception: MPI_ERR_COMM: invalid communicator

[samuelkgutierrez]

That problem should be addressed by openpmix/openpmix@3811907. We enabled by default a new shared-memory component, but found that it still needed work.

[rhc54]

Should resolve once #11379 gets committed.

[dalcinl]

Fixed via #11379.