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Subject: Re: [OMPI users] Deadlock with mpi_init_thread + mpi_file_set_view
From: Pascal Deveze (Pascal.Deveze_at_[hidden])
Date: 2011-04-04 02:40:30


Could you check that your programm closes all MPI-IO files before
calling MPI_Finalize ?

fah10_at_[hidden] a écrit :
> > Even inside MPICH2, I have given little attention to threadsafety and
> > the MPI-IO routines. In MPICH2, each MPI_File* function grabs the big
> > critical section lock -- not pretty but it gets the job done.
> > When ported to OpenMPI, I don't know how the locking works.
> > Furthermore, the MPI-IO library inside OpenMPI-1.4.3 is pretty old. I
> > wonder if the locking we added over the years will help? Can you try
> > openmpi-1.5.3 and report what happens?
>
> In Openmpi-1.5.3 with enabled threading support, the MPI-IO routines work
> without any problems. However, the dead lock now occurs when calling
> mpi_finalize with the backtrace given below. This deadlock is independent
> of the number of mpi tasks.
> However, the deadlock during mpi_finalize does not occur when no MPI-IO
> routines where called before. Unfortunately, the program terminates with a
> segfault in this case, after returning from mpi_finalize (at the end
> of the program)
>
> Fabian
>
>
> opal_mutex_lock(): Resource deadlock avoided
> #0 0x0012e416 in __kernel_vsyscall ()
> #1 0x01035941 in raise (sig=6) at
> ../nptl/sysdeps/unix/sysv/linux/raise.c:64
> #2 0x01038e42 in abort () at abort.c:92
> #3 0x00d9da68 in ompi_attr_free_keyval (type=COMM_ATTR,
> key=0xbffda0e4, predefined=0 '\000') at attribute/attribute.c:656
> #4 0x00dd8aa2 in PMPI_Keyval_free (keyval=0xbffda0e4) at
> pkeyval_free.c:52
> #5 0x01bf3e6a in ADIOI_End_call (comm=0xf1c0c0, keyval=10,
> attribute_val=0x0, extra_state=0x0) at ad_end.c:82
> #6 0x00da01bb in ompi_attr_delete. (type=UNUSED_ATTR, object=0x6,
> attr_hash=0x2c64, key=14285602, predefined=232 '\350', need_lock=128
> '\200')
> at attribute/attribute.c:726
> #7 0x00d9fb22 in ompi_attr_delete_all (type=COMM_ATTR,
> object=0xf1c0c0, attr_hash=0x8d0fee8) at attribute/attribute.c:1043
> #8 0x00dbda65 in ompi_mpi_finalize () at runtime/ompi_mpi_finalize.c:133
> #9 0x00dd12c2 in PMPI_Finalize () at pfinalize.c:46
> #10 0x00d6b515 in mpi_finalize_f (ierr=0xbffda2b8) at pfinalize_f.c:62
>
>
>
> .
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