v5.0.x: file.c: fix uninitialized mutex in MPI_File handle

[jsquyres]

We were initializing the mutex in file_open, but that didn't handle MPI_FILE_NULL. So we move it to the constructor, and therefore it's always initialized for all file handles -- even MPI_FILE_NULL.

Signed-off-by: George Bosilca bosilca@icl.utk.edu
Signed-off-by: Jeff Squyres jeff@squyres.com
(cherry picked from commit 2118615)

This is the v5.0.x PR corresponding to main PR #12416

[wenduwan]

mpi4py failed for the (apparently) same reason as before

 [fv-az1530-442:142574] [[61101,1],1] selected pml ob1, but peer [[61101,1],0] on unknown selected pml 
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[fv-az1530-442:142574] OPAL ERROR: Unreachable in file communicator/comm.c at line 2385
[fv-az1530-442:142574] 0: Error in ompi_get_rprocs
[fv-az1530-442:142575] [[61101,1],2] selected pml ob1, but peer [[61101,1],0] on unknown selected pml 
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[fv-az1530-442:142575] OPAL ERROR: Unreachable in file communicator/comm.c at line 2385
[fv-az1530-442:142575] 1: Error in ompi_get_rprocs
setUpClass (test_ulfm.TestULFMInter) ... ERROR
setUpClass (test_ulfm.TestULFMInter) ... ERROR

======================================================================
ERROR: setUpClass (test_ulfm.TestULFMInter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/ompi/ompi/test/test_ulfm.py", line 196, in setUpClass
    INTERCOMM = MPI.Intracomm.Create_intercomm(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "src/mpi4py/MPI/Comm.pyx", line 2336, in mpi4py.MPI.Intracomm.Create_intercomm
    with nogil: CHKERR( MPI_Intercomm_create(
mpi4py.MPI.Exception: MPI_ERR_INTERN: internal error

----------------------------------------------------------------------
Ran 1667 tests in 78.168s

FAILED (errors=1, skipped=78)

======================================================================
ERROR: setUpClass (test_ulfm.TestULFMInter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/runner/work/ompi/ompi/test/test_ulfm.py", line 196, in setUpClass
    INTERCOMM = MPI.Intracomm.Create_intercomm(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "src/mpi4py/MPI/Comm.pyx", line 2336, in mpi4py.MPI.Intracomm.Create_intercomm
    with nogil: CHKERR( MPI_Intercomm_create(
mpi4py.MPI.Exception: MPI_ERR_INTERN: internal error

----------------------------------------------------------------------
Ran 1667 tests in 78.168s

FAILED (errors=1, skipped=78)
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 1 in communicator MPI_COMM_WORLD
  Proc: [[61101,1],1]
  Errorcode: 1

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.