Bug#954997: mpirun: reading from stdin more than 64k cause crashes

[Bill Allombert]

Package: openmpi-bin
Version: 3.1.3-11
Severity: normal

Dear Alastair,

Reading from stdin more than 64k of data cause mpirun to crash randomly.
Not every time but often enogh to be unreliable.
I did not see this issue with 2.0.2-2.

Apparently timing is important.
I join a minimal test program mpicat.c and a test file.

You can try something like
mpicc -Wall mpicat.c -o mpicat
for i in `seq 1 100`;do mpirun -np 12 ./mpicat < file >/dev/null; done

[pari:15569] *** Process received signal ***
[pari:15569] Signal: Segmentation fault (11)
[pari:15569] Signal code: Address not mapped (1)
[pari:15569] Failing at address: 0x88
[pari:15569] [ 0] 
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12730)[0x7f3519a06730]
[pari:15569] [ 1] 
/usr/lib/x86_64-linux-gnu/openmpi/lib/openmpi3/mca_iof_hnp.so(orte_iof_hnp_read_local_handler+0x2ee)[0x7f3514b493ae]
[pari:15569] [ 2] 
/usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(+0x22c05)[0x7f3519c3ac05]
[pari:15569] [ 3] 
/usr/lib/x86_64-linux-gnu/libevent-2.1.so.6(event_base_loop+0x5a7)[0x7f3519c3b537]
[pari:15569] [ 4] mpirun(+0x1522)[0x5629426ba522]
[pari:15569] [ 5] 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb)[0x7f351985709b]
[pari:15569] [ 6] mpirun(+0x115a)[0x5629426ba15a]
[pari:15569] *** End of error message ***

I worked aroud this bug by issuing
setvbuf(stdin,pari_malloc(SIZE),_IOFBF,SIZE);
with SIZE large enough to hold the file.

Cheers,
Bill.

-- System Information:
Debian Release: 10.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-debug'), (500, 
'proposed-updates-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-8-amd64 (SMP w/32 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), 
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages openmpi-bin depends on:
ii  libc6                        2.28-10
ii  libevent-2.1-6               2.1.8-stable-4
ii  libevent-pthreads-2.1-6      2.1.8-stable-4
ii  libhwloc5                    1.11.12-3
ii  libopenmpi3                  3.1.3-11
ii  openmpi-common               3.1.3-11
ii  openssh-client [ssh-client]  1:7.9p1-10+deb10u2
ii  zlib1g                       1:1.2.11.dfsg-1

Versions of packages openmpi-bin recommends:
ii  libopenmpi-dev  3.1.3-11

Versions of packages openmpi-bin suggests:
pn  gfortran | fortran-compiler  <none>

-- no debconf information

#include <stdio.h>
#include <mpi.h>
#include <unistd.h>

int child(void)
{
  long a;
  MPI_Recv(&a, 1, MPI_LONG, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
  MPI_Barrier(MPI_COMM_WORLD);
  MPI_Finalize();
  return 0;
}

int main(void)
{
  char buf[1024];
  int rank,size;
  long i;
  if (MPI_Init(0, NULL))
  {
    fprintf(stderr,"error starting MPI\n");
    return 1;
  }
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  MPI_Comm_size(MPI_COMM_WORLD, &size);
  if (rank)
    return child();
  for(i = 0; !feof(stdin); i++)
  {
    if (fgets(buf,128,stdin)) printf("%s",buf);
    if (i%100==1) usleep(1000*100);
    if (i>350) break;
  }
  for(i = 1; i < size; i++)
    MPI_Send(&i, 1, MPI_LONG, i, 0, MPI_COMM_WORLD);
  MPI_Barrier(MPI_COMM_WORLD);
  MPI_Finalize();
  return 0;
}

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