[ncl-talk] Crashing with bad OpenDAP Link

Carl Schreck cjschrec at ncsu.edu
Mon Mar 5 12:57:47 MST 2018 

I'm having an issue trying to read some CFS-Reforecast data through OpenDAP
in NCL. Most files work, but there are occasional ones that make NCL crash
pretty hard (see output below). One such file is this one
<https://nomads.ncdc.noaa.gov/thredds/dodsC/cfsr-hpr-ts45/wnd200_f/2006/200601/catalog.html?dataset=cfsr-hpr-ts45/wnd200_f/2006/200601/wnd200_f.01.2006012406.2006031006.2006012406.grb2>
.

Any suggestions on how I can detect a bad file like this before it crashes
NCL? Just passing it to addfile causes the crash.

Thanks!
Carl

 Copyright (C) 1995-2017 - All Rights Reserved
 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.4.1-04May2017_1732
 The use of this software is governed by a License Agreement.
 See http://www.ncl.ucar.edu/ for more details.
*ncl 0>
f=addfile("https://nomads.ncdc.noaa.gov/thredds/dodsC/cfsr-hpr-ts45/wnd200_f/2006/200601/wnd200_f.01.2006012406.2006031006.2006012406.grb2
<https://nomads.ncdc.noaa.gov/thredds/dodsC/cfsr-hpr-ts45/wnd200_f/2006/200601/wnd200_f.01.2006012406.2006031006.2006012406.grb2>","r")*
Duplicate dataset field names:
cfsr-hpr-ts45%2fwnd200_f%2f2006%2f200601%2fwnd200_f%2e01%2e2006012406%2e2006031006%2e2006012406%2egrb2
context: Dataset { Float32 U-component_of_wind[time1 = 177][pressure =
1][lat = 181][lon = 360]; Float32 V-component_of_wind[time = 179][pressure
= 1][lat = 181][lon = 360]; Int32 time[time = 179]; Int32 time1[time1 =
177]; Float64 lat[lat = 181]; Float64 lon[lon = 360]; String
latLonCoordSys; Float64 pressure[pressure = 1]; Float32
V-component_of_wind[time2 = 1][height_above_ground = 1][lat = 190][lon =
384]; Int32 time[time = 179]; Int32 time1[time1 = 177]; Int32 time2[time2 =
1]; Float64 lat[lat = 190]; Float64 gaussw[lat = 190]; Float64 lon[lon =
384]; String latLonCoordSys; Float64
height_above_ground[height_above_ground = 1]; Float64 pressure[pressure =
1];}
cfsr-hpr-ts45%2fwnd200_f%2f2006%2f200601%2fwnd200_f%2e01%2e2006012406%2e2006031006%2e2006012406%2egrb2;^
*** Error in `ncl': double free or corruption (!prev): 0x000000000d932fb0
***
======= Backtrace: =========
/usr/lib64/libc.so.6(+0x7c619)[0x7f7eb746b619]
ncl(ocfree+0x1f)[0xe8034e]
ncl(ocnodes_free+0x1e0)[0xe86800]
ncl[0xec6099]
ncl(DAPparse+0x1f5)[0xec632a]
ncl(ocfetch+0x2dd)[0xe83db8]
ncl(oc_fetch+0x79)[0xe7a600]
ncl(dap_fetch+0x17f)[0xebd349]
ncl[0xe782b0]
ncl(NCD2_open+0x4a5)[0xe73fc1]
ncl(NC_open+0x2a0)[0xe3f06c]
ncl(nc__open+0x46)[0xe3e521]
ncl[0x822ca9]
ncl(_NclFileCreate+0x3c7)[0x805302]
ncl(_NclOpenFile+0x483)[0x7d0b69]
ncl(_NclIAddFile+0x1b7)[0x8cd741]
ncl(CallINTRINSIC_FUNC_CALL+0x43)[0x8a2b48]
ncl(_NclExecute+0x3eb)[0x8ae005]
ncl(yyparse+0x6bd)[0x777de9]
ncl(NclDriver+0xc16)[0x774025]
ncl(main+0x9)[0x7707b6]
/usr/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f7eb7410c05]
ncl[0x7706e1]
======= Memory map: ========
00400000-02846000 r-xp 00000000 00:4a 771250262
/snfs2/home/carl/ncl_ncarg/bin/ncl
02a45000-02b12000 r--p 02445000 00:4a 771250262
/snfs2/home/carl/ncl_ncarg/bin/ncl
02b12000-02c61000 rw-p 02512000 00:4a 771250262
/snfs2/home/carl/ncl_ncarg/bin/ncl
02c61000-06512000 rw-p 00000000 00:00 0
08214000-0d956000 rw-p 00000000 00:00 0
[heap]
7f7eac000000-7f7eac021000 rw-p 00000000 00:00 0
7f7eac021000-7f7eb0000000 ---p 00000000 00:00 0
7f7eb37d7000-7f7eb380c000 r--s 00000000 fd:01 1611467726
 /var/db/nscd/hosts
7f7eb380c000-7f7eb3a0d000 rw-p 00000000 00:00 0
7f7eb3a0d000-7f7eb3a6d000 r-xp 00000000 fd:01 1077832509
 /usr/lib64/libpcre.so.1.2.0
7f7eb3a6d000-7f7eb3c6d000 ---p 00060000 fd:01 1077832509
 /usr/lib64/libpcre.so.1.2.0
7f7eb3c6d000-7f7eb3c6e000 r--p 00060000 fd:01 1077832509
 /usr/lib64/libpcre.so.1.2.0
7f7eb3c6e000-7f7eb3c6f000 rw-p 00061000 fd:01 1077832509
 /usr/lib64/libpcre.so.1.2.0
7f7eb3c6f000-7f7eb3c71000 r-xp 00000000 fd:01 1076477375
 /usr/lib64/libfreebl3.so
7f7eb3c71000-7f7eb3e70000 ---p 00002000 fd:01 1076477375
 /usr/lib64/libfreebl3.so
7f7eb3e70000-7f7eb3e71000 r--p 00001000 fd:01 1076477375
 /usr/lib64/libfreebl3.so
7f7eb3e71000-7f7eb3e72000 rw-p 00002000 fd:01 1076477375
 /usr/lib64/libfreebl3.so
7f7eb3e72000-7f7eb3e96000 r-xp 00000000 fd:01 1074687352
 /usr/lib64/libselinux.so.1
7f7eb3e96000-7f7eb4095000 ---p 00024000 fd:01 1074687352
 /usr/lib64/libselinux.so.1
7f7eb4095000-7f7eb4096000 r--p 00023000 fd:01 1074687352
 /usr/lib64/libselinux.so.1
7f7eb4096000-7f7eb4097000 rw-p 00024000 fd:01 1074687352
 /usr/lib64/libselinux.so.1
7f7eb4097000-7f7eb4099000 rw-p 00000000 00:00 0
7f7eb4099000-7f7eb409b000 r-xp 00000000 fd:01 1078494182
 /usr/lib64/libXau.so.6.0.0
7f7eb409b000-7f7eb429b000 ---p 00002000 fd:01 1078494182
 /usr/lib64/libXau.so.6.0.0
7f7eb429b000-7f7eb429c000 r--p 00002000 fd:01 1078494182
 /usr/lib64/libXau.so.6.0.0
7f7eb429c000-7f7eb429d000 rw-p 00003000 fd:01 1078494182
 /usr/lib64/libXau.so.6.0.0
7f7eb429d000-7f7eb42a4000 r-xp 00000000 fd:01 1078457975
 /usr/lib64/librt-2.17.so
7f7eb42a4000-7f7eb44a3000 ---p 00007000 fd:01 1078457975
 /usr/lib64/librt-2.17.so
7f7eb44a3000-7f7eb44a4000 r--p 00006000 fd:01 1078457975
 /usr/lib64/librt-2.17.so
7f7eb44a4000-7f7eb44a5000 rw-p 00007000 fd:01 1078457975
 /usr/lib64/librt-2.17.so
7f7eb44a5000-7f7eb44ad000 r-xp 00000000 fd:01 1075307386
 /usr/lib64/libcrypt-2.17.so
7f7eb44ad000-7f7eb46ac000 ---p 00008000 fd:01 1075307386
 /usr/lib64/libcrypt-2.17.so
7f7eb46ac000-7f7eb46ad000 r--p 00007000 fd:01 1075307386
 /usr/lib64/libcrypt-2.17.so
7f7eb46ad000-7f7eb46ae000 rw-p 00008000 fd:01 1075307386
 /usr/lib64/libcrypt-2.17.so
7f7eb46ae000-7f7eb46dc000 rw-p 00000000 00:00 0
7f7eb46dc000-7f7eb46df000 r-xp 00000000 fd:01 1074820322
 /usr/lib64/libkeyutils.so.1.5
7f7eb46df000-7f7eb48de000 ---p 00003000 fd:01 1074820322
 /usr/lib64/libkeyutils.so.1.5
7f7eb48de000-7f7eb48df000 r--p 00002000 fd:01 1074820322
 /usr/lib64/libkeyutils.so.1.5
7f7eb48df000-7f7eb48e0000 rw-p 00003000 fd:01 1074820322
 /usr/lib64/libkeyutils.so.1.5
7f7eb48e0000-7f7eb48ed000 r-xp 00000000 fd:01 1074821491
 /usr/lib64/libkrb5support.so.0.1
7f7eb48ed000-7f7eb4aec000 ---p 0000d000 fd:01 1074821491
 /usr/lib64/libkrb5support.so.0.1
7f7eb4aec000-7f7eb4aed000 r--p 0000c000 fd:01 1074821491
 /usr/lib64/libkrb5support.so.0.1
7f7eb4aed000-7f7eb4aee000 rw-p 0000d000 fd:01 1074821491
 /usr/lib64/libkrb5support.so.0.1
7f7eb4aee000-7f7eb4b29000 r-xp 00000000 fd:01 1075015850
 /usr/lib64/libquadmath.so.0.0.0
7f7eb4b29000-7f7eb4d28000 ---p 0003b000 fd:01 1075015850
 /usr/lib64/libquadmath.so.0.0.0
7f7eb4d28000-7f7eb4d29000 r--p 0003a000 fd:01 1075015850
 /usr/lib64/libquadmath.so.0.0.0
7f7eb4d29000-7f7eb4d2a000 rw-p 0003b000 fd:01 1075015850
 /usr/lib64/libquadmath.so.0.0.0
7f7eb4d2a000-7f7eb4d51000 r-xp 00000000 fd:01 1143288053
 /usr/lib64/libxcb.so.1.1.0
7f7eb4d51000-7f7eb4f50000 ---p 00027000 fd:01 1143288053
 /usr/lib64/libxcb.so.1.1.0
7f7eb4f50000-7f7eb4f51000 r--p 00026000 fd:01 1143288053
 /usr/lib64/libxcb.so.1.1.0
7f7eb4f51000-7f7eb4f52000 rw-p 00027000 fd:01 1143288053
 /usr/lib64/libxcb.so.1.1.0
7f7eb4f52000-7f7eb4f79000 r-xp 00000000 fd:01 1074687455
 /usr/lib64/libexpat.so.1.6.0
7f7eb4f79000-7f7eb5179000 ---p 00027000 fd:01 1074687455
 /usr/lib64/libexpat.so.1.6.0
7f7eb5179000-7f7eb517b000 r--p 00027000 fd:01 1074687455
 /usr/lib64/libexpat.so.1.6.0
7f7eb517b000-7f7eb517c000 rw-p 00029000 fd:01 1074687455
 /usr/lib64/libexpat.so.1.6.0
7f7eb517c000-7f7eb521c000 r-xp 00000000 fd:01 1142930368
 /usr/lib64/libfreetype.so.6.10.0
7f7eb521c000-7f7eb541b000 ---p 000a0000 fd:01 1142930368
 /usr/lib64/libfreetype.so.6.10.0
7f7eb541b000-7f7eb5421000 r--p 0009f000 fd:01 1142930368
 /usr/lib64/libfreetype.so.6.10.0
7f7eb5421000-7f7eb5422000 rw-p 000a5000 fd:01 1142930368
 /usr/lib64/libfreetype.so.6.10.0
7f7eb5422000-7f7eb545c000 r-xp 00000000 fd:01 1097103702
 /usr/lib64/libnspr4.so
7f7eb545c000-7f7eb565b000 ---p 0003a000 fd:01 1097103702
 /usr/lib64/libnspr4.so
7f7eb565b000-7f7eb565c000 r--p 00039000 fd:01 1097103702
 /usr/lib64/libnspr4.so
7f7eb565c000-7f7eb565e000 rw-p 0003a000 fd:01 1097103702
 /usr/lib64/libnspr4.so
7f7eb565e000-7f7eb5660000 rw-p 00000000 00:00 0
7f7eb5660000-7f7eb5664000 r-xp 00000000 fd:01 1097205616
 /usr/lib64/libplc4.so
7f7eb5664000-7f7eb5863000 ---p 00004000 fd:01 1097205616
 /usr/lib64/libplc4.so
7f7eb5863000-7f7eb5864000 r--p 00003000 fd:01 1097205616
 /usr/lib64/libplc4.so
7f7eb5864000-7f7eb5865000 rw-p 00004000 fd:01 1097205616
 /usr/lib64/libplc4.soAborted


-- 

<https://ncics.org/> *Carl J. Schreck III, PhD*
*Research Scholar*
North Carolina State University <http://ncsu.edu/>
North Carolina Institute for Climate Studies (NCICS) <https://ncics.org/>
151 Patton Ave, Asheville, NC 28801
e: cjschrec at ncsu.edu
o: +1 828 257 3140 <(828)%20257-3140>
c: +1 828 484 1702 <(828)%20484-1702>
Publications
<http://scholar.google.com/citations?hl=en&user=th8ONEcAAAAJ&view_op=list_works&sortby=pubdate>
ncics.org/mjo
CycloneCenter.org <https://www.cyclonecenter.org/>
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