[OMPI users] Segfault in mpi-java

[Alexander Daryin]

Hi

I am using Java MPI bindings and periodically get fatal erros. This is 
illustrated by the following model Java program.

import mpi.MPI;
import mpi.MPIException;
import mpi.Prequest;
import mpi.Request;
import mpi.Status;

import java.nio.ByteBuffer;
import java.util.Random;

public class TestJavaMPI {

   private static final int NREQ = 16;
   private static final int BUFFSIZE = 0x2000;
   private static final int NSTEP = 1000000000;

   public static void main(String... args) throws MPIException {
       MPI.Init(args);
       Random random = new Random();
       Prequest[] receiveRequests = new Prequest[NREQ];
       Request[] sendRequests = new Request[NREQ];
       ByteBuffer[] receiveBuffers = new ByteBuffer[NREQ];
       ByteBuffer[] sendBuffers = new ByteBuffer[NREQ];
       for(int i = 0; i < NREQ; i++) {
           receiveBuffers[i] = MPI.newByteBuffer(BUFFSIZE);
           sendBuffers[i] = MPI.newByteBuffer(BUFFSIZE);
           receiveRequests[i] = MPI.COMM_WORLD.recvInit(receiveBuffers[i], 
BUFFSIZE, MPI.BYTE, MPI.ANY_SOURCE, MPI.ANY_TAG);
           receiveRequests[i].start();
           sendRequests[i] = MPI.COMM_WORLD.iSend(sendBuffers[i], 0, MPI.BYTE, 
MPI.PROC_NULL, 0);
       }
       for(int step = 0; step < NSTEP; step++) {
           if( step % 128 == 0 ) System.out.println(step);
           int index;
           do {
               Status status = Request.testAnyStatus(receiveRequests);
               if( status != null )
                   receiveRequests[status.getIndex()].start();
               index = Request.testAny(sendRequests);
           } while( index == MPI.UNDEFINED );
           sendRequests[index].free();
           sendRequests[index] = MPI.COMM_WORLD.iSend(sendBuffers[index], 
BUFFSIZE, MPI.BYTE,
                   random.nextInt(MPI.COMM_WORLD.getSize()), 0);
       }
       MPI.Finalize();
   }
}

On Linux, this produces a segfault after about a million steps. On OS X, 
instead of segfault it prints the following error message

java(64053,0x127e4d000) malloc: *** error for object 0x7f80eb828808: incorrect 
checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
[mbp:64053] *** Process received signal ***
[mbp:64053] Signal: Abort trap: 6 (6)
[mbp:64053] Signal code:  (0)
[mbp:64053] [ 0] 0   libsystem_platform.dylib            0x00007fff86b5ff1a 
_sigtramp + 26
[mbp:64053] [ 1] 0   ???                                 0x0000000000000000 0x0 
+ 0
[mbp:64053] [ 2] 0   libsystem_c.dylib                   0x00007fff80c7bb73 
abort + 129
[mbp:64053] [ 3] 0   libsystem_malloc.dylib              0x00007fff8c26ce06 
szone_error + 625
[mbp:64053] [ 4] 0   libsystem_malloc.dylib              0x00007fff8c2645c8 
small_free_list_remove_ptr + 154
[mbp:64053] [ 5] 0   libsystem_malloc.dylib              0x00007fff8c2632bf 
szone_free_definite_size + 1856
[mbp:64053] [ 6] 0   libjvm.dylib                        0x000000010e257d89 
_ZN2os4freeEPvt + 63
[mbp:64053] [ 7] 0   libjvm.dylib                        0x000000010dea2b0a 
_ZN9ChunkPool12free_all_butEm + 136
[mbp:64053] [ 8] 0   libjvm.dylib                        0x000000010e30ab33 
_ZN12PeriodicTask14real_time_tickEi + 77
[mbp:64053] [ 9] 0   libjvm.dylib                        0x000000010e3372a3 
_ZN13WatcherThread3runEv + 267
[mbp:64053] [10] 0   libjvm.dylib                        0x000000010e25d87e 
_ZL10java_startP6Thread + 246
[mbp:64053] [11] 0   libsystem_pthread.dylib             0x00007fff8f1402fc 
_pthread_body + 131
[mbp:64053] [12] 0   libsystem_pthread.dylib             0x00007fff8f140279 
_pthread_body + 0
[mbp:64053] [13] 0   libsystem_pthread.dylib             0x00007fff8f13e4b1 
thread_start + 13
[mbp:64053] *** End of error message ***

OpenMPI version is 1.8.4. Java version is 1.8.0_25-b17.

Best regards,
Alexander Daryin