[mvapich-discuss] Spawned Process cannot access shared memory

[Jannek Squar]

Hello everybody,

I encountered a problem regarding MVAPICH2 2.2 and gcc 6.3.0 while using 
MPI-3 shared memory with dynamically spawned processes in Fortran on a 
single node with shared memory. See simplified example files attached.

My master-process spawns one slave-process and both try to create shared 
memory. Since the slave shall access the shared memory created by the 
master it calls mpi_win_shared_query, but cPtr, which should hold the 
process-local address, has not been associated. Therefore the execution 
fails with "Program received signal SIGSEGV: Segmentation fault - 
invalid memory reference".

If I build those files with IntelMPI2017 everything runs fine. Since I'm 
still new to MPI-3 I hope that I did not only introduce some bug into 
the example code.


Greetings
Jannek
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OBJS =  Master.o Slave.o
FFLAG = -Wall -g
FC = mpif90#
#FC = /home/squar/bin/mpif90
INCLUDE =
LIBS =
PROGRAMS = Master.x Slave.x

all: $(PROGRAMS)

intel: FC = mpiifort 
intel: all
	@echo "Use Intel-Compiler"
	

$(PROGRAMS): $(OBJS)
	@echo "Create Binaries"
	${FC} ${LIBS} -o $@ $(basename $@).o

%.o: %.f90
	@echo "Create Object-File"
	${FC} ${FFLAG} ${INCLUDE} -c $<

clean:
	rm -f $(OBJS) $(PROGRAMS)

run: $(PROGRAMS)
	mpirun -np 1 ./Master.x
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