Segmentation Fault

Sat Jan 5 05:44:48 PST 2013

Hi Kris,

I made the change as you suggested - but it still core dumped.

Below is what I got out of gdb.

I can see that it shows I went into capsfilter_set_property - but then 
goes into debug stuff.  Is there something wrong with what I am trying 
to set? (It seemed OK from the command line as part of gst-launch.)

[ian at localhost GSTstuff]$ gdb --core=core.2517 ./SBCRecord
GNU gdb (GDB) Fedora (7.5.1-32.fc18)
Copyright (C) 2012 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 "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/ian/GSTstuff/SBCRecord...(no debugging 
symbols found)...done.
[New LWP 2517]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `./SBCRecord --gst-debug-level=9 test.avi'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000364ec51a73 in gst_debug_print_object () from 
/lib64/libgstreamer-1.0.so.0
Missing separate debuginfos, use: debuginfo-install 
alsa-lib-1.0.26-2.fc18.x86_64 glib2-2.34.2-1.fc18.x86_64 
glibc-2.16-28.fc18.x86_64 gstreamer1-1.0.4-1.fc18.x86_64 
gstreamer1-plugins-base-1.0.4-1.fc18.x86_64 
gstreamer1-plugins-good-1.0.4-1.fc18.x86_64 libffi-3.0.10-3.fc18.x86_64 
libjpeg-turbo-1.2.1-3.fc18.x86_64 libv4l-0.8.8-3.fc18.x86_64 
orc-0.4.16-6.fc18.x86_64 zlib-1.2.7-9.fc18.x86_64
(gdb) bt
#0  0x000000364ec51a73 in gst_debug_print_object () from 
/lib64/libgstreamer-1.0.so.0
#1  0x000000364ec523b4 in _gst_info_printf_extension_ptr () from 
/lib64/libgstreamer-1.0.so.0
#2  0x00000035ef44887d in vfprintf () from /lib64/libc.so.6
#3  0x00000035ef50a0e1 in __vasprintf_chk () from /lib64/libc.so.6
#4  0x00000035f1c845ab in g_vasprintf () from /lib64/libglib-2.0.so.0
#5  0x00000035f1c640cd in g_strdup_vprintf () from /lib64/libglib-2.0.so.0
#6  0x000000364ec5267d in gst_debug_message_get () from 
/lib64/libgstreamer-1.0.so.0
#7  0x000000364ec538a0 in gst_debug_log_default () from 
/lib64/libgstreamer-1.0.so.0
#8  0x000000364ec524ec in gst_debug_log_valist () from 
/lib64/libgstreamer-1.0.so.0
#9  0x000000364ec52657 in gst_debug_log () from /lib64/libgstreamer-1.0.so.0
#10 0x00007f00173dc3c4 in gst_capsfilter_set_property () from 
/usr/lib64/gstreamer-1.0/libgstcoreelements.so
#11 0x00000035f2816df4 in g_object_set_valist () from 
/lib64/libgobject-2.0.so.0
#12 0x00000035f2817607 in g_object_set () from /lib64/libgobject-2.0.so.0
#13 0x00000000004012d6 in main ()

On 05/01/2013 11:53, Krzysztof Konopko wrote:
> Hi Ian,
>
> To me the caps value passed as a constant (a literal) looks suspicious.
> Try something like this:
>
> gchar caps_value[] = "your value goes here";
>
> and then
>
> g_object_set (G_OBJECT (vcapsfilter), "caps", caps_value, NULL);
>
> That's just my guess as OTH passing a literal value should result in a
> pointer pointing to some location in the DATA section which should be
> fine. Hm...
>
> To find out what actually happened use:
>
> gdb --core=<core file> <your app>
>
> and then in GDB:
> bt
>
> If you don't actually get a core file, use (before you run your crashing
> app):
> ulimit -c unlimited
>
> HTH,
> Kris
>
> On 05/01/13 09:12, Ian Davidson wrote:
>> I am trying to write a GStreamer app where I  use a caps filter.  I have
>>
>>    vcapsfilter  = gst_element_factory_make ("capsfilter", "vid-caps");
>>
>> which appears to have been successful.
>>
>> Then I tried
>>
>>    g_object_set (G_OBJECT (vcapsfilter), "caps",
>> "video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)25/1",
>> NULL);
>>
>> When my program comes to execute that line I get a "Segmentation fault
>> (core dumped)" message.  I suspect that I must be doing something wrong
>> <grin>, but I don't know what I should be doing.  I have tried to wind
>> up the debug level to 9 but absolutely nothing gets logged.
>>
>> Ian
> _______________________________________________
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> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>

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Ian Davidson
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