[GRASS-dev] lib/python/pygrass/vector/testsuite/test_doctest.py SIGSEGV

Vaclav Petras wenzeslaus at gmail.com
Mon Oct 13 07:26:40 PDT 2014

On Tue, Sep 23, 2014 at 1:44 PM, Vaclav Petras <wenzeslaus at gmail.com> wrote:

> On Mon, Sep 22, 2014 at 9:53 AM, Vaclav Petras <wenzeslaus at gmail.com>
> wrote:
>> On Wed, Sep 17, 2014 at 9:22 AM, Vaclav Petras <wenzeslaus at gmail.com>
>> wrote:
>>> Hi,
>>> doctest for pygrass.vector are crashing with segmentation fault in
>>> Vect_gen_num_db_links() function.
>>> ...
>>> Unfortunately, the segfault is not visible in test report, output just
>>> ends. The return code of all -11, does this mean something? Do you know how
>>> to get the info which is available to system crash handler (which contains
>>> "crashed with SIGSEGV", function name and even call stack)?
>>> I got the crash report again, now with
>> test_doctest.py crashed with SIGSEGV in Vect_line_prune()
>> in piemonte_utf32_wgs84_grass7 location.
>> Now again segmentation fault in Vect_get_num_db_links(). There were some
> details about "target" and "source", not sure if really useful but it would
> be great to have a way to obtain this info.
This error is still present. The tests expects to run in NC basic location
but it runs in full one, so the map names are slightly different. So, it
should fail but to with segmentation fault.

Anyway, now I noticed that there are some processes still alive after the
tests ended. All have status "Sleeping" and each uses about 20 MB of
memory, waiting channel is "poll_schedule_timeout", all are "python ...
/path/to/pygrass/vector/testsuite/test_doctest.py". Now I have 5 processes
for each day. I'm not completely sure about their times, 3 are from one
hour and 2 from another. I run all tests 3 times (in different locations).
I was not make sense out of the times and process count but it is highly
probable that it relates to the segmentation fault since it is the same

If you have some ideas about the processes, please share. It would be good
if somebody could test it.

To run the test use

python test_doctest.py

in `lib/python/pygrass/vector/testsuite` directory and NC sample location
(you can try both basic and full).

To run the test as a part of all other tests use

python -m grass.gunittest.main --location nc_spm_grass7 --location-type nc

in GRASS session in GRASS source code top directory (it will use current
session and GISDBASE/grassdata).



> Again, the info is only in system crash report dialog. It is even not
>> visible in the report:
>> http://fatra.cnr.ncsu.edu/grassgistests/reports_for_date-2014-09-22-07-00/report_for_piemonte_utm32_wgs84_grass7_stdmaps/lib/python/pygrass/vector/test_doctests/index.html
>> If somebody has a experience with getting these reports or information
>> about process segmentation fault, please let me know.
>> Vaclav
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