[gst-devel] gst-java, segfaults, and linking

Bradley Schatz bradley at greystate.com
Sun Sep 1 05:08:05 CEST 2002 

I am currently trying to get gst-java working with the current gstreamer
distribution (0.4). I understand that this extesion has not worked with
gstreamer since the 0.2 level. Getting it to compile required fixing a
few differences in the API. 

I am running into a spot of a problem, with the example.Mp3v2 program
segfaulting in the gst code, when the java bindings call gst_init(NULL,
NULL). (Mp3v2 is basically the java equivalent of the helloworld c
example distributed with gstreamer.)

The gdb segfault is here:

Program received signal SIGSEGV, Segmentation fault. 
0x4c88556e in gst_xml_registry_paths_start_element (context=0x80d68c8, 
    element_name=0x0, attribute_names=0xbfffcec4,
attribute_values=0xbfffcec4, 
    user_data=0x80d5f48, error=0xbfffcec0) at gstxmlregistry.c:1079 
1079          if (!strcmp (element_name, "GST-PluginRegistry")) { 
(gdb) print element_name 
$1 = (gchar *) 0x4c892cb1 "GST-PluginRegistry" 

Here is the odd thing. Note above that element_name is passed into the
function as NULL. And then it has a value when I inspect it.

A couple of questions.

- Should the XML code that gst_init is using be passing null values to
strcmp? I have tried stepping into g_markup_parse_context_parse but
havent the source installed with my current configuration.

- When I run the helloworld c program all runs fine, using the same call
of gst_init(NULL, NULL) What could be possible reasons for the
difference in behavior. ?Different dynamic libraries?

- Looking further into dynamic libraries issue, i notice when i run ldd
over my running version of helloworld that ldd says it in not a dynamic
executable. What do the -Wl options in the linking scheme for helloworld
do?

Any suggestions techniques I could use to continue narrowing this one
down would be very much appreciated.

Bradley



Degug Traces follow


Program received signal SIGSEGV, Segmentation fault. 
0x4c88556e in gst_xml_registry_paths_start_element (context=0x80d68c8, 
    element_name=0x0, attribute_names=0xbfffcec4,
attribute_values=0xbfffcec4, 
    user_data=0x80d5f48, error=0xbfffcec0) at gstxmlregistry.c:1079 
1079          if (!strcmp (element_name, "GST-PluginRegistry")) { 
(gdb) print element_name 
$1 = (gchar *) 0x4c892cb1 "GST-PluginRegistry" 
(gdb) where 
#0  0x4c88556e in gst_xml_registry_paths_start_element
(context=0x80d68c8, 
    element_name=0x0, attribute_names=0xbfffcec4,
attribute_values=0xbfffcec4, 
    user_data=0x80d5f48, error=0xbfffcec0) at gstxmlregistry.c:1079 
#1  0x4c9a8872 in g_markup_parse_context_parse (context=0x80d68c8, 
    text=0x80d6a90 "<?xml
version=\"1.0\"?>\n<GST-PluginRegistry>\n<gst-plugin-paths>\n<path>/usr/local/lib/gst</path>\n</gst-plugin-paths>\n<plugin>\n<name>sdlvideosink</name>\n<filename>/usr/local/lib/gst/libgstsdlvideosink.so<"..., 
    text_len=10240, error=0xbfffcf48) at gmarkup.c:1238 
#2  0x4c883b51 in gst_xml_registry_add_path_list_func
(registry=0x80d5f48) 
    at gstxmlregistry.c:382 
#3  0x4c8837b2 in gst_xml_registry_set_property (object=0x80d5f48,
prop_id=1, 
    value=0xbfffd000, pspec=0x80d4df8) at gstxmlregistry.c:255 
#4  0x4c952ac8 in g_object_set_valist (object=0x80d5f48, 
    first_property_name=0x4c89118f "location", var_args=0xbfffd0cc) 
    at gobject.c:571 
#5  0x4c953026 in g_object_set (_object=0x80d5f48, 
    first_property_name=0x4c89118f "location") at gobject.c:960 
#6  0x4c883633 in gst_xml_registry_new (name=0x4c887522
"global_registry", 
    location=0x4c887920 "/usr/local/etc/gstreamer/registry.xml") 
    at gstxmlregistry.c:223 
#7  0x4c858d20 in init_pre () at gst.c:282 
#8  0x4c85896d in gst_init_with_popt_table (argc=0x0, argv=0x0, 
    popt_options=0x0) at gst.c:170 
---Type <return> to continue, or q <return> to quit---l 
#9  0x4c85875f in gst_init (argc=0x0, argv=0x0) at gst.c:135 
#10 0x4c1c0b2b in Java_gnu_gst_Gst_init (env=0x805177c, cls=0xbfffd380, 
    argv=0xbfffd388) at gnu_gst_Gst.c:13 
#11 0x42049806 in ?? () 
#12 0x42041f93 in ?? () 
#13 0x4203f195 in ?? () 
#14 0x402ac4f6 in JavaCalls::call_helper () 
   from /usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
#15 0x4034744d in os::os_exception_wrapper () 
   from /usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
#16 0x402ac644 in JavaCalls::call () 
   from /usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
#17 0x402b45cd in jni_invoke () 
   from /usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
#18 0x402c3bcd in jni_CallStaticVoidMethod () 
   from /usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
#19 0x08049372 in strcpy () 
#20 0x400601c4 in __libc_start_main () from /lib/libc.so.6 


[bradley at localhost gst-java]$ /usr/java/j2sdk1.4.0_01/bin/java -Xdebug
-Xrunjdwp:transport=dt_socket,server=y,suspend=y -cp ./bin/
example.Mp3v2 
Listening for transport dt_socket at address: 33150 
/usr/java/j2sdk1.4.0_01/jre/lib/i386/client:/usr/java/j2sdk1.4.0_01/jre/lib/i386:/usr/java/j2sdk1.4.0_01/jre/../lib/i386 

An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x4C88556E 
Function=(null)+0x4C88556E 
Library=/usr/local/lib/libgstreamer-0.4.0.so.0 

NOTE: We are unable to locate the function name symbol for the error 
      just occurred. Please refer to release documentation for possible 
      reason and solutions. 


Current Java thread: 
        at gnu.gst.Gst.init(Native Method) 
        at example.Mp3v2.main(Mp3v2.java:39) 

Dynamic libraries: 
08048000-0804d000 r-xp 00000000 03:02 99752     
/usr/java/j2sdk1.4.0_01/bin/java 
0804d000-0804e000 rw-p 00004000 03:02 99752     
/usr/java/j2sdk1.4.0_01/bin/java 
40000000-40012000 r-xp 00000000 03:02 17969      /lib/ld-2.2.5.so 
40012000-40013000 rw-p 00012000 03:02 17969      /lib/ld-2.2.5.so 
40013000-4001c000 r-xp 00000000 03:02 1128014   
/usr/java/j2sdk1.4.0_01/jre/lib/i386/native_threads/libhpi.so 
4001c000-4001d000 rw-p 00008000 03:02 1128014   
/usr/java/j2sdk1.4.0_01/jre/lib/i386/native_threads/libhpi.so 
4001d000-4002e000 r-xp 00000000 03:02 148790    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libverify.so 
4002e000-40030000 rw-p 00010000 03:02 148790    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libverify.so 
40030000-4003e000 r-xp 00000000 03:02 16620      /lib/libpthread-0.9.so 
4003e000-40045000 rw-p 0000e000 03:02 16620      /lib/libpthread-0.9.so 
40046000-40048000 r-xp 00000000 03:02 16591      /lib/libdl-2.2.5.so 
40048000-40049000 rw-p 00001000 03:02 16591      /lib/libdl-2.2.5.so 
40049000-40167000 r-xp 00000000 03:02 16329      /lib/libc-2.2.5.so 
40167000-4016c000 rw-p 0011e000 03:02 16329      /lib/libc-2.2.5.so 
40170000-40436000 r-xp 00000000 03:02 148767    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
40436000-4059f000 rw-p 002c5000 03:02 148767    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so 
405b3000-405c4000 r-xp 00000000 03:02 16337      /lib/libnsl-2.2.5.so 
405c4000-405c5000 rw-p 00011000 03:02 16337      /lib/libnsl-2.2.5.so 
405c7000-405fb000 r-xp 00000000 03:02 343865    
/usr/lib/libstdc++-2-libc6.1-1-2.9.0.so 
405fb000-40607000 rw-p 00033000 03:02 343865    
/usr/lib/libstdc++-2-libc6.1-1-2.9.0.so 
40609000-40629000 r-xp 00000000 03:02 16616      /lib/libm-2.2.5.so 
40629000-4062a000 rw-p 0001f000 03:02 16616      /lib/libm-2.2.5.so 
4062a000-4064c000 r-xp 00000000 03:02 148778    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libjava.so 
4064c000-4064e000 rw-p 00021000 03:02 148778    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libjava.so 
40650000-40664000 r-xp 00000000 03:02 148791    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libzip.so 
40664000-40667000 rw-p 00013000 03:02 148791    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libzip.so 
40667000-41ce4000 r--s 00000000 03:02 148816    
/usr/java/j2sdk1.4.0_01/jre/lib/rt.jar 
41d26000-41d3d000 r--s 00000000 03:02 148817    
/usr/java/j2sdk1.4.0_01/jre/lib/sunrsasign.jar 
41d3d000-41dab000 r--s 00000000 03:02 148794    
/usr/java/j2sdk1.4.0_01/jre/lib/jsse.jar 
41dab000-41dbe000 r--s 00000000 03:02 148793    
/usr/java/j2sdk1.4.0_01/jre/lib/jce.jar 
41dbe000-4203f000 r--s 00000000 03:02 148727    
/usr/java/j2sdk1.4.0_01/jre/lib/charsets.jar 
440e7000-440ed000 r--s 00000000 03:02 1160793   
/usr/lib/gconv/gconv-modules.cache 
440ed000-440ee000 r--p 00000000 03:02 1275165   
/usr/lib/locale/en_US/LC_IDENTIFICATION 
440ee000-440ef000 r--p 00000000 03:02 671185    
/usr/lib/locale/en_US/LC_MEASUREMENT 
440ef000-440f0000 r--p 00000000 03:02 1404544   
/usr/lib/locale/en_US/LC_TELEPHONE 
4c170000-4c19b000 r--p 00000000 03:02 931445    
/usr/lib/locale/en_US/LC_CTYPE 
4c19b000-4c19c000 r--p 00000000 03:02 1405347   
/usr/lib/locale/en_US/LC_ADDRESS 
4c19c000-4c19d000 r--p 00000000 03:02 1405333   
/usr/lib/locale/en_US/LC_NAME 
4c19d000-4c19e000 r--p 00000000 03:02 654019    
/usr/lib/locale/en_US/LC_PAPER 
4c19e000-4c19f000 r--p 00000000 03:02 865386    
/usr/lib/locale/en_US/LC_MESSAGES/SYS_LC_MESSAGES 
4c19f000-4c1a0000 r--p 00000000 03:02 669957    
/usr/lib/locale/en_US/LC_MONETARY 
4c1a0000-4c1a6000 r--p 00000000 03:02 1469180   
/usr/lib/locale/en_US/LC_COLLATE 
4c1a6000-4c1a7000 r--p 00000000 03:02 1275166   
/usr/lib/locale/en_US/LC_TIME 
4c1a7000-4c1a8000 r--p 00000000 03:02 931433    
/usr/lib/locale/en_US/LC_NUMERIC 
4c1a8000-4c1ab000 r-xp 00000000 03:02 148773    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libdt_socket.so 
4c1ab000-4c1ac000 rw-p 00002000 03:02 148773    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libdt_socket.so 
4c1ad000-4c1af000 r--s 00000000 03:02 148736    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/dnsns.jar 
4c1af000-4c1bd000 r--s 00000000 03:02 148737    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/ldapsec.jar 
4c1bd000-4c1c2000 r-xp 00000000 03:02 149129    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libGSTJava.so 
4c1c2000-4c1c3000 rw-p 00004000 03:02 149129    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libGSTJava.so 
4c1c5000-4c1ce000 r-xp 00000000 03:02 16453     
/lib/libnss_files-2.2.5.so 
4c1ce000-4c1cf000 rw-p 00008000 03:02 16453     
/lib/libnss_files-2.2.5.so 
4c1cf000-4c1fc000 r-xp 00000000 03:02 148782    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libjdwp.so 
4c1fc000-4c1fe000 rw-p 0002c000 03:02 148782    
/usr/java/j2sdk1.4.0_01/jre/lib/i386/libjdwp.so 
4c201000-4c2a4000 r--s 00000000 03:02 148738    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/localedata.jar 
4c2a4000-4c2f0000 r--s 00000000 03:02 148607    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/sound.jar 
4c2f0000-4c4d8000 r--s 00000000 03:02 148608    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/jmf.jar 
4c503000-4c520000 r--s 00000000 03:02 148739    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/sunjce_provider.jar 
4c520000-4c529000 r--s 00000000 03:02 148609    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/mediaplayer.jar 
4c529000-4c537000 r--s 00000000 03:02 148610    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/multiplayer.jar 
4c537000-4c544000 r--s 00000000 03:02 146883    
/usr/java/j2sdk1.4.0_01/jre/lib/ext/aspectjrt.jar 
4c561000-4c581000 r-xp 00000000 03:02 342771    
/usr/lib/libglib-1.2.so.0.0.10 
4c581000-4c582000 rw-p 00020000 03:02 342771    
/usr/lib/libglib-1.2.so.0.0.10 
4c582000-4c6a6000 r-xp 00000000 03:02 342970    
/usr/lib/libgtk-1.2.so.0.9.1 
4c6a6000-4c6af000 rw-p 00123000 03:02 342970    
/usr/lib/libgtk-1.2.so.0.9.1 
4c6b0000-4c6e2000 r-xp 00000000 03:02 342885    
/usr/lib/libgdk-1.2.so.0.9.1 
4c6e2000-4c6e3000 rw-p 00031000 03:02 342885    
/usr/lib/libgdk-1.2.so.0.9.1 
4c6e3000-4c6e5000 r-xp 00000000 03:02 342773    
/usr/lib/libgmodule-1.2.so.0.0.10 
4c6e5000-4c6e6000 rw-p 00001000 03:02 342773    
/usr/lib/libgmodule-1.2.so.0.0.10 
4c6e6000-4c6ed000 r-xp 00000000 03:02 1436257   
/usr/X11R6/lib/libXi.so.6.0 
4c6ed000-4c6ee000 rw-p 00006000 03:02 1436257   
/usr/X11R6/lib/libXi.so.6.0 
4c6ee000-4c6fa000 r-xp 00000000 03:02 1436251   
/usr/X11R6/lib/libXext.so.6.4 
4c6fa000-4c6fb000 rw-p 0000c000 03:02 1436251   
/usr/X11R6/lib/libXext.so.6.4 
4c6fb000-4c7cd000 r-xp 00000000 03:02 1436243   
/usr/X11R6/lib/libX11.so.6.2 
4c7cd000-4c7d0000 rw-p 000d1000 03:02 1436243   
/usr/X11R6/lib/libX11.so.6.2 
4c7d0000-4c83a000 r-xp 00000000 03:02 342916    
/usr/lib/libxml.so.1.8.17 
4c83a000-4c83d000 rw-p 00069000 03:02 342916    
/usr/lib/libxml.so.1.8.17 
4c83d000-4c849000 r-xp 00000000 03:02 342865     /usr/lib/libz.so.1.1.3 
4c849000-4c84b000 rw-p 0000b000 03:02 342865     /usr/lib/libz.so.1.1.3 
4c84b000-4c894000 r-xp 00000000 03:02 1828688   
/usr/local/lib/libgstreamer-0.4.0.so.0.0.0 
4c894000-4c897000 rw-p 00048000 03:02 1828688   
/usr/local/lib/libgstreamer-0.4.0.so.0.0.0 
4c897000-4c8a9000 r-xp 00000000 03:02 2254046   
/usr/local/lib/gst/libgstelements.so 
4c8a9000-4c8aa000 rw-p 00012000 03:02 2254046   
/usr/local/lib/gst/libgstelements.so 
4c8aa000-4c93c000 r-xp 00000000 03:02 342918    
/usr/lib/libxml2.so.2.4.23 
4c93c000-4c946000 rw-p 00091000 03:02 342918    
/usr/lib/libxml2.so.2.4.23 
4c946000-4c97a000 r-xp 00000000 03:02 342781    
/usr/lib/libgobject-2.0.so.0.0.6 
4c97a000-4c97c000 rw-p 00033000 03:02 342781    
/usr/lib/libgobject-2.0.so.0.0.6 
4c97c000-4c980000 r-xp 00000000 03:02 342783    
/usr/lib/libgthread-2.0.so.0.0.6 
4c980000-4c981000 rw-p 00003000 03:02 342783    
/usr/lib/libgthread-2.0.so.0.0.6 
4c981000-4c984000 r-xp 00000000 03:02 342779    
/usr/lib/libgmodule-2.0.so.0.0.6 
4c984000-4c985000 rw-p 00002000 03:02 342779    
/usr/lib/libgmodule-2.0.so.0.0.6 
4c985000-4c9e6000 r-xp 00000000 03:02 342777    
/usr/lib/libglib-2.0.so.0.0.6 
4c9e6000-4c9e7000 rw-p 00060000 03:02 342777    
/usr/lib/libglib-2.0.so.0.0.6 
4c9e7000-4c9ed000 r-xp 00000000 03:02 342796    
/usr/lib/libpopt.so.0.0.0 
4c9ed000-4c9ee000 rw-p 00005000 03:02 342796    
/usr/lib/libpopt.so.0.0.0 

Local Time = Wed Aug 28 12:45:32 2002 
Elapsed Time = 481 
# 
# The exception above was detected in native code outside the VM 
# 
# Java VM: Java HotSpot(TM) Client VM (1.4.0_01-b03 mixed mode) 
# 
# An error report file has been saved as hs_err_pid6565.log. 
# Please refer to the file for further information. 
# 
Aborted

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