Re: [netcdfgroup] crash with netCDF4.1.3 using nc_get_vara_float reading from opendap url

• To: Ansley Manke <Ansley.B.Manke@xxxxxxxx>
• Subject: Re: [netcdfgroup] crash with netCDF4.1.3 using nc_get_vara_float reading from opendap url
• From: Dennis Heimbigner <dmh@xxxxxxxxxxxxxxxx>
• Date: Tue, 02 Aug 2011 15:30:08 -0600

I have placed this in our bug tracking system
at https://www.unidata.ucar.edu/jira/browse/NCF-105

=Dennis Heimbigner
 Unidata


Ansley Manke wrote:

Hi,

I have a crash to report. This piece of code reads the first timestep of a dataset. It works correctly when linked with netCDF4.1.2, but segfaults when linked with 4.1.3. If I have it read the second timestep, it works correctly, linked with either version of netcdf.

/* vara_test_8 */
/* ansley.b.manke@xxxxxxxx  8/2011 */

/*linked with:

cc vara_test_8.c -g -o vara_test_8 /usr/local/netcdf_413/lib/libnetcdf.a /usr/local/hdf5_187/lib/libhdf5_hl.a /usr/local/hdf5_187/lib/libhdf5.a -lz -lc -lm -lcurl

cc vara_test_8.c -g -o vara_test_8 /usr/local/netcdf_412/lib/libnetcdf.a /usr/local/hdf5_186/lib/libhdf5_hl.a /usr/local/hdf5_186/lib/libhdf5.a -lz -lc -lm -lcurl

When linked with netCDF4.1.3, reading the first timestep, the code segfaults

*/

#include<stdio.h>
#include "netcdf.h"

main()
{

  int ncid;
  int varid;
  int i;
  int status;
  size_t start[3], count[3];
  float dat[16200];

status = nc_open("http://ferret.pmel.noaa.gov/thredds/dodsC/data/PMEL/COADS/coads_sst.cdf";, NC_NOWRITE, &ncid);

  status = nc_inq_varid(ncid, "SST", &varid);

/* Read one timestep */

  start[0] = 0;  /* crashes if this is 0; success if it's 1 */
  start[1] = 0;
  start[2] = 0;
  count[0] = 1;
  count[1] = 90;
  count[2] = 180;

  status = nc_get_vara_float (ncid, varid, start, count, (float*) dat);

  printf(" \n");
  printf("********************\n");
  printf("Print  values read\n");
  printf(" \n");
  for (i=1000; i<1008; i++)
       {
        printf("i = %d, dat, %f,\n",i,dat[i]);
        dat[i] = 0;
       }

   status = nc_close(ncid);
}

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  • [netcdfgroup] crash with netCDF4.1.3 using nc_get_vara_float reading from opendap url
    • From: Ansley Manke