netcdf-fortran 4.4.2: Seg fault in nf90_get_att

[Dave-Allured (Dave Allured)]

With netcdf-fortran 4.4.2, this program seg faults on the first call to nf90_get_att. The function call is supposed to read a file attribute of type integer*2 into a program variable of integer*4.

My current software configuration is:

Mac OS X version 10.10.2
Gfortran version MacPorts gcc49 4.9.2_1
Netcdf-C version 4.3.3.1 (Mac ports)
Netcdf-fortran version 4.4.2 (Mac ports)

program test
   use netcdf
   implicit none
   character(*), parameter :: infile  = 'test.nc'
   character(*), parameter :: varname = 'olr'
   character(*), parameter :: attname = 'missing_value'
   integer ncid, varid, status, ival

   print *, 'Netcdf-C version = ' // trim (nf90_inq_libvers())

   print *, 'Call nf90_open.'
   print *, '  Input file = ' // trim (infile)
   status = nf90_open (infile, nf90_nowrite, ncid)
   print '(a,i0)', '   return status = ', status
   if (status /= 0) print *, 'Error stop.'
   if (status /= 0) call exit (1)

   print *, 'Call nf90_inq_varid "' // trim (varname) // '"'
   status = nf90_inq_varid (ncid, varname, varid)
   print '(a,i0)', '   return status = ', status
   if (status /= 0) print *, 'Error stop.'
   if (status /= 0) call exit (1)

   print '(3a,i0)', '   varid for "', trim (varname), '" = ', varid

   print *, 'Call nf90_get_att for '// trim (attname)
   status = nf90_get_att (ncid, varid, attname, ival)
   print '(a,i0)', '   return status = ', status
   print '(a,i0)', '   return value = ', ival

   print *, 'End program.'
end program test

Compile command:

gfortran -g -fcheck=all -I/opt/local/include -L/opt/local/lib -lnetcdff test.get-att.f90

Complete contents of input file, via ncdump:

mac56:~/bugs/netcdf/get-att.4.4 227> ncdump test.nc
netcdf test {
dimensions:
	time = 3 ;
variables:
	short olr(time) ;
		olr:missing_value = 99s ;
data:

 olr = 10, 20, 30 ;
}

Console output of test program:

mac56:~/bugs/netcdf/get-att.4.4 225> ./a.out
 Netcdf-C version = 4.3.3.1 of Mar  9 2015 07:31:25 $
 Call nf90_open.
   Input file = test.nc
   return status = 0
 Call nf90_inq_varid "olr"
   return status = 0
   varid for "olr" = 1
 Call nf90_get_att for missing_value

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0  0x104484fbc
#1  0x1044854df
#2  0x7fff8f666f19
Segmentation fault

[Dave-Allured (Dave Allured)]

Netcdf test input file

[Dave-Allured (Dave Allured)]

Cc Me!

[basmac]

This problem does not occur when clang35 variant is used to build netcdf and netcdf-fortran

[mf2k (Frank Schima)]

In the future, please Cc the port maintainers (port info --maintainers netcdf-fortran), if any. As reporter, you do not need to Cc yourself.

[Dave-Allured (Dave Allured)]

mf2k, Thank you for your guidance. I searched excessively for guidance on how to create a new ticket. Where was any of this presented in Mac Ports documentation? Why did you remove my keywords? Why did you remove the port version number?

[mf2k (Frank Schima)]

There is a big red link at the top of the new ticket page with guidelines. The ticket wiki page notes proper keywords that are useful, but also see DraftKeywordGuidelines. The port version is not relevant for the port field. The version of the port should be in the description as you correctly noted.

[Dave-Allured (Dave Allured)]

mf2k, you are right, I failed to read to the bottom of 7.1.2 in the guidelines, which answers most of my questions. Sorry for the outburst.

[Dave-Allured (Dave Allured)]

Problem cause unknown. Fix unknown. Recent versions work fine for me now.

Please close this ticket.