[ncl-talk] Segmentation fault on a GFS file fragment

[David Brown]

Hi Peter,
I will look into this issue.
 -dave

On Tue, Sep 29, 2015 at 5:40 PM, Peter Novak <P.Novak at tudelft.nl> wrote:
> Dear NCL users and developers,
> I encountered a segmentation fault of NCL on a GRIB2 file extracted from
> NOAA GFS forecast datasets. The file is located here
> http://www.aronde.net/dump/gfs.t18z.sfluxgrbf03.grib2PRES_TOP_high.grib2.
>
> The file is extracted with curl from GFS dataset
> http://www.ftp.ncep.noaa.gov/data/nccf/com/gfs/prod/gfs.2015092918/gfs.t18z.sfluxgrbf03.grib2,
> variable "PRES:high cloud top level" (as referred to in the index file
> at http://www.ftp.ncep.noaa.gov/data/nccf/com/gfs/prod/gfs.2015092918/gfs.t18z.sfluxgrbf03.grib2.idx).
> The extraction command with ranges was:
> $ curl -f -s -r 24660742-27538435 <url above> -o <outfile>
>
> I am getting segfault upon the following:
> $ ncl_filedump gfs.t18z.sfluxgrbf03.grib2PRES_TOP_high.grib2 -v PRES_P8_L233_GGA0_avg
>
> The same when I try to read the file with an ncl script:
>         indat=addfile(<file>, "r")
>         vars=getfilevarnames(indat)
>         printVarSummary(indat->$vars(0)$)
>
> At the same time PanoplyJ reads the file without a hickup. Other files I
> extracted using curl from the same GFS datasets work fine, the only
> difference I spotted is that this one contains missing values (NaNf in
> PanoplyJ), perhaps that could be the cause of the problem?
>
> I would appreciate any advice regarding how to read and process this
> file with NCL, or what is exactly wrong with it.
>
> As for the NCL setup I have:
> $ ncl
> Copyright (C) 1995-2015 - All Rights Reserved
> University Corporation for Atmospheric Research
> NCAR Command Language Version 6.3.0
> The use of this software is governed by a License Agreement.
> See http://www.ncl.ucar.edu/ for more details.
>
> $ uname -a
> Linux ... 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> Thanks for your help.
>
> Best,
>
> Peter.
>
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