[mvapich-discuss] MPI_Win_flush_all() crashes on shared memory

[Hajime Fujita]

Hello,

I have found a crash issue in MVAPICH2-2.1a.

When I launch the attached program (even with one process), it crashes 
with SIGSEGV. However if I specify MV2_USE_SHARED_MEM=0, it runs correctly.

I think I encountered a similar problem at the beginning of April this 
year. MV2_USE_SHARED_MEM=0 was given from Mingzhe at that moment for a 
workaround. However I'm curious if there is a way to fix this 
completely, as now I have a simpler reproducer.

MVAPICH version is MVAPICH2-2.1a, also includes a patch given by 
Mingzhe. I don't know how to identify the patch, but I believe it 
corresponds to this in 2.0.1.
 >    - Add check for pending operations in one-sided channel in flush_all

Hardware platform:
   UChicago RCC Midway
   http://rcc.uchicago.edu/resources/midway_specs.html


The following is the log taken on the Midway system. I had one node, one 
process allocation, so just typing "mpiexec" implies "mpiexec -n 1".
----

[hfujita at midway070 rma_winflush_test]$ mpiexec 
./rma_winflush_testProcess 0: going to issue Win_flush_all()
[midway070:mpi_rank_0][error_sighandler] Caught error: Segmentation 
fault (signal 11)

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   PID 9363 RUNNING AT midway070
=   EXIT CODE: 11
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
===================================================================================
YOUR APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault 
(signal 11)
This typically refers to a problem with your application.
Please see the FAQ page for debugging suggestions
[hfujita at midway070 rma_winflush_test]$ MV2_USE_SHARED_MEM=0 mpiexec 
./rma_winflush_test
Process 0: going to issue Win_flush_all()
Process 0: after Win_flush_all()



[hfujita at midway070 rma_winflush_test]$ mpichversion
MVAPICH2 Version:       2.1a
MVAPICH2 Release date:  Sun Sep 21 12:00:00 EDT 2014
MVAPICH2 Device:        ch3:mrail
MVAPICH2 configure: 
--prefix=/project/aachien/local/mvapich2-2.1a-gcc-4.8-rma-patch 
--enable-shared --no-create --no-recursion
MVAPICH2 CC:    gcc    -DNDEBUG -DNVALGRIND -O2
MVAPICH2 CXX:   g++   -DNDEBUG -DNVALGRIND -O2
MVAPICH2 F77:   gfortran -L/lib -L/lib   -O2
MVAPICH2 FC:    gfortran   -O2
----


Thank you,
Hajime

-- 
Hajime Fujita
Postdoctoral Scholar, Large-Scale Systems Group
Department of Computer Science, The University of Chicago
http://www.cs.uchicago.edu/people/hfujita
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