[mvapich-discuss] Hang in MVAPICH2-2.2 in PSM with MPI_THREAD_MULTIPLE

[Hari Subramoni]

Hi Adam,

Thanks for the report. We will take a look at it and get back to you soon.

Do you happen to have any reproducer for this issue?

Regards,
Hari.

On Aug 3, 2017 9:32 PM, "Moody, Adam T." <moody20 at llnl.gov> wrote:

> Hello MVAPICH team,
> We've got a user reporting an hang in MPI_Test when using MVAPICH2-2.2 for
> PSM.  This only happens when using MPI_THREAD_MULTIPLE.  Although the app
> is using MPI_THREAD_MULTIPLE, they don't actually use threads in this
> case.  They do not hit the hang if they call MPI_Init instead.
>
> The stack trace on the main thread looks like the following:
>
> pthread_spin_lock
> psm_irecv
> MPID_Irecv
> MPIDU_Sched_continue
> MPIDU_Sched_progress
> psm_progress_wait
> MPIR_Test_impl
> PMPI_Test
>
> I think the main thread has perhaps deadlocked itself on the primary PSM
> lock, but I'm not entirely clear why.
>
> Can you see where the main thread might have grabbed the psm lock the
> first time based on this stack trace?
>
> Or perhaps it bailed out of a function w/o releasing the lock?
> Thanks,
> -Adam
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