Re: pscoast: GMT_non_zero_winding given non-closed polygon

Hamish,

Thanks for this extended test. I would also say that the double free 
does indeed seams to exist but it's so strange that I don't catch it 
with MSVC that is way more picky with those things than gcc or clang.
Also, did you try with GMT5? Our GMT5  test suite can (and is time to 
time) be run under valgrind, which is supposed to catch these type of 
problems.

Joaquim

> Hi,
>
> with regard to these earlier threads about problems with pscoast on
> newer versions of Ubuntu and Debian,
>
>    http://gmt.soest.hawaii.edu/boards/1/topics/730
>    http://thread.gmane.org/gmane.comp.gis.gmt.user/21512
>
> """
> *** Error in `pscoast': double free or corruption (!prev):
> 0x00000000025099f0 *** Aborted
> """
>
> I'd like to point to these bug reports:
>
>    https://bugs.debian.org/758685
>    https://bugs.launchpad.net/ubuntu/+source/gmt/+bug/1349718
>
> which include a full backtrace I did just now.
>
> note current version of the GSHHS packages there are 2.2.0, and *.cdf
> versions are shipped as part of the gmt-gshhs-{low|high|full} packages.
>
>    https://packages.debian.org/sid/all/gmt-gshhs-low/filelist
>
> our compile flags and patches are stored here:
>    http://anonscm.debian.org/cgit/pkg-grass/gmt.git/tree/debian?id=debian/4.5.12-1
>
> The patches are not that interesting, just replacing C++ style comments
> with /* C */ versions. The compile flag setup can be found in the
> debian/rules file at the above git tree browser, and the
> proof-in-the-pudding of what compiler flags were used can be found in
> the actual build log:
>
>    https://buildd.debian.org/status/fetch.php?pkg=gmt&arch=amd64&ver=4.5.12-1&stamp=1395314222
>
> basically it boils down to:
>
> gcc -fPIC -ansi -pedantic -O2 -I/usr/include \
>    -DGMT_SHARE_PATH=\"/usr/lib/gmt/share\" -DGMT_GSHHG_PATH=\"no\" [...]
>
>
> I tried various things like replacing the coastline files with the
> latest GSHHG 2.3.2, and downgrading the default version in configure.ac
> (as far as I can see that is just for a string in a warning message),
> but no luck, get the same thing. Identical gshhs 2.2.0 cdf files work
> fine with GMT 4.5.7 from Debian/stable (wheezy). The trouble started
> somewhere between there and Ubuntu 14.04 (GMT 4.5.11).
>
>
> One wild theory that occurs to me is that instead of the gshhs version
> mismatch I was assuming, it is instead the new hardening flags forcing
> the program to bail instead of continuing on in an insecure state? So
> the double-free() might be real?  (??)
>
>
>
> thanks,
> Hamish
> (DebianGIS team)
>
> ps- I notice in 4.5.11 (ubuntu 14.04) when running a filled contour as
> part of the MB-System example scripts the GMT map output is creating
> vertical streaks from the patches (in matlab plotting sense) down to
> the lower x-axis of the plot window. Is that a known bug? I can provide
> more details if needed.
>
> Mailing list for GMT discussions of all kinds.  If you are not sure you have found a bug, discuss it here first.
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Mailing list for GMT discussions of all kinds.  If you are not sure you have found a bug, discuss it here first.
To formally report bugs or request features, please register and add New Issue on gmt.soest.hawaii.edu
To unsubscribe, send the message "signoff gmt-help" to [email protected]
Note: gmt-help will become obsolete on Sept 1, 2014 - please use forum on gmt.soest.hawaii.edu instead.