[Pvfs2-users] Error with MALLOC_CHECK_ enabled

[Phil Carns]

Hi Wei-keng,

I think this has probably been fixed in 2.7.1 if you are able to try 
that.  I just tried to reproduce your problem using that version and 
everything seemed to be Ok.

-Phil

Wei-keng Liao wrote:
> I am running a simple MPI-IO program (attached) on PVFS 2.7.0.
> When I set the environment variable MALLOC_CHECK_ to 1 or above, I got
> error messages below: (No error if MALLOC_CHECK_ is not set and if file 
> name has "ufs:" prefix)
> 
> % mpicc -g pvfs2_bug.c -o pvfs2_bug
> % setenv MALLOC_CHECK_ 3
> % mpiexec -gdb -n 4 pvfs2_bug
> malloc: using debugging hooks
> malloc: using debugging hooks
> 1: malloc: using debugging hooks
> 2: malloc: using debugging hooks
> 0: malloc: using debugging hooks
> 3: malloc: using debugging hooks
> 1: malloc: using debugging hooks
> 2: malloc: using debugging hooks
> 0: malloc: using debugging hooks
> 3: malloc: using debugging hooks
> 0-3:  (gdb) run /pvfs2/wkliao/testfile.dat
> 0-3:  Continuing.
> 1:  
> 1:  Program received signal SIGSEGV, Segmentation fault.
> 1:  0x00000038a3872190 in _int_free (av=0x38a3b52980, mem=0x79b300)
> 1:      at malloc.c:4663
> 1:  4663                unlink(nextchunk, bck, fwd);
> 1:  (gdb) 1:  (gdb) where
> 1:  #0  0x00000038a3872190 in _int_free (av=0x38a3b52980, mem=0x79b300)
> 1:      at malloc.c:4663
> 1:  #1  0x00000038a3876693 in free_check (mem=0x79b300, 
> 1:      caller=<value optimized out>) at hooks.c:298
> 1:  #2  0x00000038a3875ec7 in __libc_free (mem=0x0) at malloc.c:3590
> 1:  #3  0x00000000004ea2cd in PINT_smcb_free ()
> 1:  #4  0x0000000000486e84 in PINT_sys_release ()
> 1:  #5  0x000000000048f4f1 in PVFS_sys_io ()
> 1:  #6  0x0000000000444d54 in ADIOI_PVFS2_ReadContig ()
> 1:  #7  0x000000000043cb64 in MPIOI_File_read ()
> 1:  #8  0x0000000000408f8f in PMPI_File_read_at ()
> 1:  #9  0x0000000000403e5d in main (argc=2, argv=0x7fff8b04d438) at pvfs2_bug.c:29
> 1:  (gdb) 
> 
> ---------------------------------------------------------------------------
> pvfs2_bug.c
> ---------------------------------------------------------------------------
> #include <stdio.h>
> #include <stdlib.h>
> #include <mpi.h>
> 
> /*----< main() >------------------------------------------------------------*/
> int main(int argc, char **argv) {
>     int            i, rank, np;
>     char           buf[65536];
>     MPI_File       fh;
>     MPI_Status     status;
>     MPI_Offset     offset;
> 
>     MPI_Init(&argc, &argv);
>     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>     MPI_Comm_size(MPI_COMM_WORLD, &np);
>     if (argc != 2) {
>         if (rank == 0) fprintf(stderr,"Usage: %s filename\n",argv[0]);
>         MPI_Finalize(); return 1;
>     }
> 
>     MPI_File_open(MPI_COMM_WORLD, argv[1], MPI_MODE_CREATE | MPI_MODE_RDWR,
>                   MPI_INFO_NULL, &fh);
> 
>     offset = rank * 65536;
>     for (i=0; i<65536; i++) buf[i] = '0'+rank;
>     MPI_File_write_at(fh, offset, buf, 65536, MPI_CHAR, &status);
> 
>     offset = ((rank+1)%np) * 65536;
>     MPI_File_read_at(fh, offset, buf, 65536, MPI_CHAR, &status);
> 
>     MPI_File_close(&fh);
> 
>     MPI_Finalize();
>     return 0;
> }
> 
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