[gst-devel] Discoverer (gst-python) crashes

[Dominique Würtz]

Hi!

I recently played around with the Discoverer which ships with
gst-python, but, while the actual discovery succeeds, my test app often
crashes when exiting.

import pygst
pygst.require("0.10")
from discoverer import Discoverer
import gobject

def on_discovered(disc, success):
	print "discovered! rate =", disc.audiorate

disc = Discoverer("test.wav")
disc.connect("discovered", on_discovered)
disc.discover()

mainloop = gobject.MainLoop()
mainloop.run()

IIRC when run with Python 2.4, it gave me mostly

Fatal Python error: GC object already tracked
Aborted (core dumped)


and 2.5 usually resulted in

discovered rate = 44100
*** glibc detected *** python: double free or corruption (!prev):
0x08380600 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7e677cd]
/lib/tls/i686/cmov/libc.so.6[0xb7e68f74]
/lib/tls/i686/cmov/libc.so.6(realloc+0xfe)[0xb7e6b08e]
python(_PyObject_GC_Resize+0x33)[0x80f2753]
python(PyFrame_New+0x288)[0x8111628]
python(PyEval_EvalCodeEx+0x69)[0x80c9659]
python[0x8111fc1]
python(PyObject_Call+0x27)[0x805c787]
python(PyEval_CallObjectWithKeywords+0x6c)[0x80c1f7c]
python(PyErr_PrintEx+0xbe)[0x80e8ace]
python(PyRun_SimpleFileExFlags+0xe3)[0x80e93c3]
python(Py_Main+0x9c0)[0x8059330]
python(main+0x22)[0x8058862]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc)[0xb7e15ebc]
python[0x80587b1]
======= Memory map: ========
08048000-0813f000 r-xp 00000000 08:02 564215     /usr/bin/python2.5
0813f000-08164000 rw-p 000f6000 08:02 564215     /usr/bin/python2.5
08164000-083a7000 rw-p 08164000 00:00 0          [heap]
b6700000-b6721000 rw-p b6700000 00:00 0
b6721000-b6800000 ---p b6721000 00:00 0
b6816000-b6821000 r-xp 00000000 08:02 321984     /lib/libgcc_s.so.1
b6821000-b6822000 rw-p 0000a000 08:02 321984     /lib/libgcc_s.so.1
b6822000-b6823000 ---p b6822000 00:00 0
b6823000-b7023000 rw-p b6823000 00:00 0
b7023000-b7024000 ---p b7023000 00:00 0
b7024000-b7824000 rw-p b7024000 00:00 0
b7824000-b783c000 r-xp 00000000 08:02 233185
/usr/lib/libgstaudio-0.10.so.0.9.0
b783c000-b783d000 rw-p 00018000 08:02 233185
/usr/lib/libgstaudio-0.10.so.0.9.0
b783d000-b7847000 r-xp 00000000 08:02 233205
/usr/lib/libgstriff-0.10.so.0.9.0
b7847000-b7848000 rw-p 00009000 08:02 233205
/usr/lib/libgstriff-0.10.so.0.9.0
b7856000-b7860000 r-xp 00000000 08:02 161039
/usr/lib/gstreamer-0.10/libgstwavparse.so
b7860000-b7861000 rw-p 0000a000 08:02 161039
/usr/lib/gstreamer-0.10/libgstwavparse.so
b7861000-b786a000 r-xp 00000000 08:02 233200
/usr/lib/libgstpbutils-0.10.so.0.9.0
b786a000-b786b000 rw-p 00009000 08:02 233200
/usr/lib/libgstpbutils-0.10.so.0.9.0
b786c000-b7877000 r-xp 00000000 08:02 164099
/usr/lib/gstreamer-0.10/libgsttypefindfunctions.so
b7877000-b7879000 rw-p 0000a000 08:02 164099
/usr/lib/gstreamer-0.10/libgsttypefindfunctions.so
b7879000-b789f000 r-xp 00000000 08:02 160992
/usr/lib/gstreamer-0.10/libgstcoreelements.so
b789f000-b78a1000 rw-p 00025000 08:02 160992
/usr/lib/gstreamer-0.10/libgstcoreelements.so
b78a1000-b78a8000 r-xp 00000000 08:02 233176
/usr/lib/libgstinterfaces-0.10.so.0.9.0
b78a8000-b78a9000 rw-p 00007000 08:02 233176
/usr/lib/libgstinterfaces-0.10.so.0.9.0
b78a9000-b78b3000 r-xp 00000000 08:02 98420
/usr/lib/python2.5/site-packages/gst-0.10/gst/interfaces.so
b78b3000-b78b5000 rw-p 00009000 08:02 98420
/usr/lib/python2.5/site-packages/gst-0.10/gst/interfaces.so
b78b5000-b78be000 r-xp 00000000 08:02 355098
/lib/tls/i686/cmov/libnss_files-2.5.so
b78be000-b78c0000 rw-p 00008000 08:02 355098
/lib/tls/i686/cmov/libnss_files-2.5.so
b78c0000-b78c8000 r-xp 00000000 08:02 355102
/lib/tls/i686/cmov/libnss_nis-2.5.so
b78c8000-b78ca000 rw-p 00007000 08:02 355102
/lib/tls/i686/cmov/libnss_nis-2.5.so
b78ca000-b78dd000 r-xp 00000000 08:02 355092
/lib/tls/i686/cmov/libnsl-2.5.so
b78dd000-b78df000 rw-p 00012000 08:02 355092
/lib/tls/i686/cmov/libnsl-2.5.so
b78df000-b78e1000 rw-p b78df000 00:00 0
b78e1000-b78e8000 r-xp 00000000 08:02 355094
/lib/tls/i686/cmov/libnss_compat-2.5.so
b78e8000-b78ea000 rw-p 00006000 08:02 355094
/lib/tls/i686/cmov/libnss_compat-2.5.so
b78ee000-b78ef000 rw-p b78ee000 00:00 0
b78ef000-b78f7000 r-xp 00000000 08:02 164088
/usr/lib/gstreamer-0.10/libgstdecodebin.so
b78f7000-b78f8000 rw-p 00007000 08:02 164088
/usr/lib/gstreamer-0.10/libgstdecodebin.so
b78f8000-b78fd000 r--p 00000000 08:02 258381
/usr/share/locale-langpack/de/LC_MESSAGES/gstreamer-0.10.mo
b78fd000-b79d4000 r--p 00000000 08:02 32949
/usr/lib/locale/de_DE.utf8/LC_COLLATE
b79d4000-b79e7000 r-xp 00000000 08:02 565389     /usr/lib/libz.so.1.2.3
b79e7000-b79e8000 rw-p Aborted (core dumped)


Should I file a bug about this? Any ideas how I could track down the
cause of this? I want to stress that the crashes don't happen always,
but are absolutely indeterministic. For the record, the test.wav file
plays perfectly in Totem or Rhythmbox.

Regards,

Dominique