[mapserver-users] Segfaults with MapScript from Python

[Jelmer Baas]

Dan, List,

I've been messing around with this issue some more, and found the cause!

This record crashes MapScript is this (this is the ONLY record in the database now):
OID, geom, ogr_style
1234, POINT(620008 6697971), 'LABEL(t:"(0) test")'

The ONLY thing that matters is the OGR_STYLE clause - the (0) part. Replace the style with 'LABEL(t:".(0) test")' and all is well.

I attached my test scripts. Run simply with 'python test.py'.

Test-data:
CREATE TABLE testset
(
  oid oid,
  geom geometry,
  ogr_style character varying(350),
  filetype character(1)
)
Insert into testset(oid, geom, ogr_style) values (1234, '010100002031BF0D00F726AD90D0EB2241846601CDFC8C5941', 'LABEL(t:"(0) test")')

This single record crashes Python / MapScript with a lovely
" Segmentation fault (core dumped)".

Hopefully someone can debug this issue.

Regards,
Jelmer

-----Original Message-----
From: Dan Little [mailto:theduckylittle at gmail.com] 
Sent: donderdag 12 februari 2015 16:55
To: Jelmer Baas
Cc: mapserver-users at lists.osgeo.org
Subject: Re: [mapserver-users] Segfaults with MapScript from Python

I don't see any debugging symbols in there making life a little bit
more difficult.

Is your Python code very complex? Could a useful snippet be posted to a gist?

On Thu, Feb 12, 2015 at 9:44 AM, Jelmer Baas <baas at speerit.nl> wrote:
> Hi List,
>
> Some of my automated renders are failing because Python crashes with an Segmentation fault. I've finally found at least some logs of this:
> Feb 12 16:16:19 vm-ctwrender07 kernel: [276759.889265] traps: python[8002] general protection ip:7f104ec4f50f sp:7fff17d8d790 error:0 in libmapserver.so.6.4.1[7f104eb91000+1d8000]
> Feb 12 15:08:01 vm-ctwrender07 kernel: [272664.046597] traps: python[7841] general protection ip:7f80558877b6 sp:7fff641f27c0 error:0 in libmapserver.so.6.4.1[7f80557c9000+1d8000]
> Feb 12 13:53:01 vm-ctwrender07 kernel: [268166.881041] python[7614]: segfault at fffffffffffffffc ip 00007f805588750f sp 00007fff641f27c0 error 5 in libmapserver.so.6.4.1[7f80557c9000+1d8000]
>
> Unfortunatly, I have no idea how to continue. I suspect this has something todo with odd font rendering (too large, too small), since I had issues with that before. Can someone match these addresses with code and find out where it crashes?
>
> Thanks in advance!
>
> Regards,
> Jelmer
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> mapserver-users at lists.osgeo.org
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