[mapserver-users] Need help testing WMS segfault

Fri Jan 29 17:57:18 EST 2010

Hi Paul,

Ok.  I'll see if I can replicate the problem with a single data layer, and
will then package everything together so another developer can run it.

Thanks,

Roger
--

On Fri, Jan 29, 2010 at 2:16 PM, Paul Ramsey <pramsey at opengeo.org> wrote:

> Lovely, Another AGG bug. Well the next thing is to package up your
> environment so a developer can duplicate the problem on their rig. Figure
> out which layer it is, so you only have to pack that data up. Since the
> issue is arising in AGG, flag the ticket to the AGG module. When you pack up
> your map file, remember to also pack up or strip out things like templates,
> font libraries, symbol libraries, etc. Ideally, copy the whole mess to a new
> path on your system ensure it does in fact run independently of the rest of
> your installation.
>
> Best,
>
> Paul
>
> On 2010-01-29, at 2:11 PM, Roger André wrote:
>
> Hi Paul,
>
> Thanks for the advice. (Chris Schmidt suggested I do the same thing in IRC
> yesterday, and I forgot to try it.)
>
> Below are the results of gdb.  It's fun to run, but uhm... not something
> I'm readily able to decipher (yet).
>
> $ gdb /usr/lib/cgi-bin/mapserv
> GNU gdb (GDB) 7.0-ubuntu
> Copyright (C) 2009 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i486-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>...
> Reading symbols from /usr/lib/cgi-bin/mapserv...done.
> (gdb) run
> "QUERY_STRING=map=/var/www/mapfiles/seattle.map&layers=roads&styles=&service=WMS&width=256&format=image/png&request=GetMap&height=256&srs=EPSG:4326&version=1.1.1&bbox=-122.338256836,47.6586914062,-122.332763672,47.6641845703"
> Starting program: /usr/lib/cgi-bin/mapserv
> "QUERY_STRING=map=/var/www/mapfiles/seattle.map&layers=roads&styles=&service=WMS&width=256&format=image/png&request=GetMap&height=256&srs=EPSG:4326&version=1.1.1&bbox=-122.338256836,47.6586914062,-122.332763672,47.6641845703"
> [Thread debugging using libthread_db enabled]
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0740bbf2 in ?? () from /lib/tls/i686/cmov/libc.so.6
> (gdb) bt
> #0  0x0740bbf2 in ?? () from /lib/tls/i686/cmov/libc.so.6
> #1  0x0740d868 in malloc () from /lib/tls/i686/cmov/libc.so.6
> #2  0x006abbb7 in operator new(unsigned int) () from
> /usr/lib/libstdc++.so.6
> #3  0x006abced in operator new[](unsigned int) () from
> /usr/lib/libstdc++.so.6
> #4  0x080dbdd5 in void
> mapserver::render_scanlines<mapserver::rasterizer_scanline_aa<mapserver::rasterizer_sl_clip<mapserver::ras_conv_int>
> >, mapserver::scanline_u8,
> mapserver::renderer_scanline_aa_solid<mapserver::renderer_base<mapserver::pixfmt_alpha_blend_rgba<mapserver::blender_rgba_pre<mapserver::rgba8,
> mapserver::order_bgra>, mapserv_row_ptr_cache<int>, int> > >
> >(mapserver::rasterizer_scanline_aa<mapserver::rasterizer_sl_clip<mapserver::ras_conv_int>
> >&, mapserver::scanline_u8&,
> mapserver::renderer_scanline_aa_solid<mapserver::renderer_base<mapserver::pixfmt_alpha_blend_rgba<mapserver::blender_rgba_pre<mapserver::rgba8,
> mapserver::order_bgra>, mapserv_row_ptr_cache<int>, int> > >&) ()
> #5  0x080ba7ac in T.1744 ()
> #6  0x080bdbda in msDrawShadeSymbolAGG ()
> #7  0x0813b3d2 in msDrawShadeSymbol ()
> #8  0x0809ff17 in msDrawShape ()
> #9  0x080a2cfe in msDrawVectorLayer ()
> #10 0x080a343d in msDrawLayer ()
> #11 0x080a4fd7 in msDrawMap ()
> #12 0x08157d82 in msWMSGetMap ()
> #13 0x0815cf36 in msWMSDispatch ()
> #14 0x080e9924 in msOWSDispatch ()
> #15 0x08056583 in main ()
> (gdb)
>
> Roger
> --
>
> On Fri, Jan 29, 2010 at 1:38 PM, Paul Ramsey <pramsey at opengeo.org> wrote:
>
>> Roger,
>>
>> It looks like you're on Linux, so pull a stacktrace, it's fun!
>>
>> gdb /path/to/mapserv
>>
>> ... lots of info ...
>>
>> (gdb) run
>> "QUERY_STRING=map=/var/www/mapfiles/seattle.map&layers=roads&styles=&service=WMS&width=256&format=image/png&request=GetMap&height=256&srs=EPSG:4326&version=1.1.1&bbox=-122.338256836,47.6586914062,-122.332763672,47.6641845703"
>>
>> then when you hit to segfault, do
>>
>> (gdb) bt
>>
>> bt stands for backtrace
>>
>> now you'll have a lot more useful information about what went wrong,
>>
>> Yours,
>>
>> Paul
>>
>> On Fri, Jan 29, 2010 at 1:27 PM, Roger André <randre at gmail.com> wrote:
>> > Hi All,
>> >
>> > I'm experiencing some strange behavior that I would appreciate some help
>> > testing.  My MapServer 5.6 instance is segfaulting in response to
>> certain
>> > WMS requests it is receiving from TileCache.  Below is one of the
>> specific
>> > requests:
>> >
>> >
>> http://localhost/cgi-bin/mapserv?map=/var/www/mapfiles/seattle.map&layers=roads&styles=&service=WMS&width=256&format=image/png&request=GetMap&height=256&srs=EPSG:4326&version=1.1.1&bbox=-122.338256836,47.6586914062,-122.332763672,47.6641845703
>> >
>> > I'd appreciate it if someone who has a layer that covers Seattle would
>> try
>> > the bbox extents listed above and report back if it causes an error for
>> > them.
>> >
>> > FYI - When I set this bbox as the EXTENTS in my MAP, and the SIZE to 256
>> > 256, Mapserver delivers the image without any problem.
>> >
>> > Thanks,
>> >
>> > Roger
>> >
>> > _______________________________________________
>> > mapserver-users mailing list
>> > mapserver-users at lists.osgeo.org
>> > http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> >
>> >
>>
>
>
> --
> Paul Ramsey
> OpenGeo - http://opengeo.org
> Breath in. Breath out. Ahhh. PostGIS.
>
>
>
>
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