(gdb) info threads
  6 Thread 0xb78c2b90 (LWP 8327)  0xb7f59430 in __kernel_vsyscall ()
  5 Thread 0xb70c1b90 (LWP 8328)  0xb7f59430 in __kernel_vsyscall ()
  4 Thread 0xb66ffb90 (LWP 8329)  0xb7f59430 in __kernel_vsyscall ()
  3 Thread 0xb5efeb90 (LWP 8330)  0xb7f59430 in __kernel_vsyscall ()
  2 Thread 0xb56fdb90 (LWP 8331)  0xb7f59430 in __kernel_vsyscall ()
  1 Thread 0xb7a296c0 (LWP 8325)  0xb7f59430 in __kernel_vsyscall ()

(gdb) backtrace
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7b4cae7 in poll () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7c4774b in g_poll () from /usr/lib/libglib-2.0.so.0
#3  0xb7c39f82 in ?? () from /usr/lib/libglib-2.0.so.0
#4  0xb7c3a5ba in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#5  0xb7eab40c in gst_bus_poll (bus=0x89e3940, events=GST_MESSAGE_ANY, timeout=-1) at gstbus.c:1058
#6  0x0804ace7 in event_loop (pipeline=0x8a2c000, blocking=1, target_state=GST_STATE_PAUSED) at gst-launch.c:401
#7  0x0804c1b8 in main (argc=3, argv=0xbfd75d84) at gst-launch.c:819

(gdb) thread 2
[Switching to thread 2 (Thread 0xb56fdb90 (LWP 8331))]#0  0xb7f59430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7be10e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7edfa0c in handle_pad_block (pad=0x8a7d9f8) at gstpad.c:3879
#3  0xb7ee2768 in gst_pad_push_event (pad=0x8a7d9f8, event=0x8a5a428) at gstpad.c:4795
#4  0xb7ec4908 in gst_proxy_pad_do_event (pad=0x8a6a1c8, event=0x8a5a428) at gstghostpad.c:128
#5  0xb7ee2fb3 in gst_pad_send_event (pad=0x8a6a1c8, event=0x8a5a428) at gstpad.c:4962
#6  0xb7ee28b2 in gst_pad_push_event (pad=0x8a75f08, event=0x8a5a428) at gstpad.c:4818
#7  0xb684538b in gst_mpega_dec_sink_event (pad=0x8a75e40, event=0x8a5a428) at a/c/mp/gst/mpega/src/gstmpega.cc:342
#8  0xb7ee2fb3 in gst_pad_send_event (pad=0x8a75e40, event=0x8a5a428) at gstpad.c:4962
#9  0xb7ee28b2 in gst_pad_push_event (pad=0x8a59f08, event=0x8a5a428) at gstpad.c:4818
#10 0xb4d0c30b in gst_mp3parse_emit_frame (mp3parse=0x8a7a2b8, size=480, mode=0, crc=0) at gstmpegaudioparse.c:820
#11 0xb4d0ead6 in gst_mp3parse_chain (pad=0x8a59e40, buf=0x8a63cc8) at gstmpegaudioparse.c:1368
#12 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a59e40, is_buffer=1, data=0x8a63cc8) at gstpad.c:4042
#13 0xb7ee0d27 in gst_pad_push_data (pad=0x8a59d78, is_buffer=1, data=0x8a63cc8) at gstpad.c:4271
#14 0xb7ee12b9 in gst_pad_push (pad=0x8a59d78, buffer=0x8a63cc8) at gstpad.c:4375
#15 0xb797e742 in gst_single_queue_push_one (mq=0x8a4e818, sq=0x8a69c48, object=0x8a63cc8) at gstmultiqueue.c:806
#16 0xb797ee9b in gst_multi_queue_loop (pad=0x8a59d78) at gstmultiqueue.c:978
#17 0xb7f0724d in gst_task_func (task=0x8a5d040) at gsttask.c:234
#18 0xb7f084c1 in default_func (tdata=0x8a57680, pool=0x89c9010) at gsttaskpool.c:70
#19 0xb7c62e26 in ?? () from /usr/lib/libglib-2.0.so.0
#20 0xb7c617bf in ?? () from /usr/lib/libglib-2.0.so.0
#21 0xb7bdd4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#22 0xb7b5749e in clone () from /lib/tls/i686/cmov/libc.so.6

(gdb) thread 3
[Switching to thread 3 (Thread 0xb5efeb90 (LWP 8330))]#0  0xb7f59430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7be10e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7edfa0c in handle_pad_block (pad=0x8a65af8) at gstpad.c:3879
#3  0xb7edd43b in gst_pad_alloc_buffer_full (pad=0x8a65af8, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8, setcaps=0) at gstpad.c:2881
#4  0xb7edd98a in gst_pad_alloc_buffer (pad=0x8a65af8, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8) at gstpad.c:3001
#5  0xb7ec4a26 in gst_proxy_pad_do_bufferalloc (pad=0x8a66378, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8) at gstghostpad.c:168
#6  0xb7edcfc8 in gst_pad_buffer_alloc_unchecked (pad=0x8a66378, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8) at gstpad.c:2813
#7  0xb7edd4c1 in gst_pad_alloc_buffer_full (pad=0x8a758c8, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8, setcaps=1) at gstpad.c:2890
#8  0xb7edd9ea in gst_pad_alloc_buffer_and_set_caps (pad=0x8a758c8, offset=18446744073709551615, size=294912, caps=0x8a692e0, buf=0xb5efd9a8) at gstpad.c:3034
#9  0xb6870ec0 in gst_mpegv_dec_copy_I420 (aDec=0x8a706d0, aPicture=0xb5efdac4) at a/c/mp/gst/mpegv/src/gstmpegv.cc:741
#10 0xb687176f in gst_mpegv_dec_output_pictures (aDec=0x8a706d0) at a/c/mp/gst/mpegv/src/gstmpegv.cc:851
#11 0xb6872ebf in gst_mpegv_dec_chain (pad=0x8a75800, aInBuf=0x8a64a20) at a/c/mp/gst/mpegv/src/gstmpegv.cc:1199
#12 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a75800, is_buffer=1, data=0x8a64a20) at gstpad.c:4042
#13 0xb7ee0d27 in gst_pad_push_data (pad=0x8a59b20, is_buffer=1, data=0x8a64a20) at gstpad.c:4271
#14 0xb7ee12b9 in gst_pad_push (pad=0x8a59b20, buffer=0x8a64a20) at gstpad.c:4375
#15 0xb68bb6cf in mpegvideoparse_drain_avail (mpegvideoparse=0x8a5e1d8) at mpegvideoparse.c:482
#16 0xb68bba75 in gst_mpegvideoparse_chain_forward (mpegvideoparse=0x8a5e1d8, discont=1, buf=0x8a83a10) at mpegvideoparse.c:527
#17 0xb68bc464 in gst_mpegvideoparse_chain (pad=0x8a59a58, buf=0x8a83a10) at mpegvideoparse.c:807
#18 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a59a58, is_buffer=1, data=0x8a83a10) at gstpad.c:4042
#19 0xb7ee0d27 in gst_pad_push_data (pad=0x8a59990, is_buffer=1, data=0x8a83a10) at gstpad.c:4271
#20 0xb7ee12b9 in gst_pad_push (pad=0x8a59990, buffer=0x8a83a10) at gstpad.c:4375
#21 0xb797e742 in gst_single_queue_push_one (mq=0x8a4e818, sq=0x8a5def0, object=0x8a83a10) at gstmultiqueue.c:806
#22 0xb797ee9b in gst_multi_queue_loop (pad=0x8a59990) at gstmultiqueue.c:978
---Type <return> to continue, or q <return> to quit---
#23 0xb7f0724d in gst_task_func (task=0x8a50728) at gsttask.c:234
#24 0xb7f084c1 in default_func (tdata=0x8a57648, pool=0x89c9010) at gsttaskpool.c:70
#25 0xb7c62e26 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0xb7c617bf in ?? () from /usr/lib/libglib-2.0.so.0
#27 0xb7bdd4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#28 0xb7b5749e in clone () from /lib/tls/i686/cmov/libc.so.6

(gdb) thread 4
[Switching to thread 4 (Thread 0xb66ffb90 (LWP 8329))]#0  0xb7f59430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7be10e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7edfa0c in handle_pad_block (pad=0x8a5bcf8) at gstpad.c:3879
#3  0xb7ee2768 in gst_pad_push_event (pad=0x8a5bcf8, event=0x8a5a278) at gstpad.c:4795
#4  0xb7ec4908 in gst_proxy_pad_do_event (pad=0x8a5c538, event=0x8a5a278) at gstghostpad.c:128
#5  0xb7ee2fb3 in gst_pad_send_event (pad=0x8a5c538, event=0x8a5a278) at gstpad.c:4962
#6  0xb7ee28b2 in gst_pad_push_event (pad=0x8a62260, event=0x8a5a278) at gstpad.c:4818
#7  0xb6873520 in gst_mpegv_dec_sink_event (pad=0x8a62198, event=0x8a5a278) at a/c/mp/gst/mpegv/src/gstmpegv.cc:369
#8  0xb7ee2fb3 in gst_pad_send_event (pad=0x8a62198, event=0x8a5a278) at gstpad.c:4962
#9  0xb7ee28b2 in gst_pad_push_event (pad=0x8a59800, event=0x8a5a278) at gstpad.c:4818
#10 0xb68ba785 in mpv_send_pending_segs (mpegvideoparse=0x8a5e078) at mpegvideoparse.c:178
#11 0xb68bb6b7 in mpegvideoparse_drain_avail (mpegvideoparse=0x8a5e078) at mpegvideoparse.c:480
#12 0xb68bbabe in gst_mpegvideoparse_chain_forward (mpegvideoparse=0x8a5e078, discont=0, buf=0x8a63c18) at mpegvideoparse.c:539
#13 0xb68bc464 in gst_mpegvideoparse_chain (pad=0x8a4ff10, buf=0x8a63c18) at mpegvideoparse.c:807
#14 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a4ff10, is_buffer=1, data=0x8a63c18) at gstpad.c:4042
#15 0xb7ee0d27 in gst_pad_push_data (pad=0x8a4fe48, is_buffer=1, data=0x8a63c18) at gstpad.c:4271
#16 0xb7ee12b9 in gst_pad_push (pad=0x8a4fe48, buffer=0x8a63c18) at gstpad.c:4375
#17 0xb797e742 in gst_single_queue_push_one (mq=0x8a4e818, sq=0x8a2f9b0, object=0x8a63c18) at gstmultiqueue.c:806
#18 0xb797ee9b in gst_multi_queue_loop (pad=0x8a4fe48) at gstmultiqueue.c:978
#19 0xb7f0724d in gst_task_func (task=0x8a506a0) at gsttask.c:234
#20 0xb7f084c1 in default_func (tdata=0x8a4f620, pool=0x89c9010) at gsttaskpool.c:70
#21 0xb7c62e26 in ?? () from /usr/lib/libglib-2.0.so.0
#22 0xb7c617bf in ?? () from /usr/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#23 0xb7bdd4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#24 0xb7b5749e in clone () from /lib/tls/i686/cmov/libc.so.6

(gdb) thread 5
[Switching to thread 5 (Thread 0xb70c1b90 (LWP 8328))]#0  0xb7f59430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7be10e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb794d06e in gst_data_queue_push (queue=0x8a48da0, item=0x8d37260) at gstdataqueue.c:391
#3  0xb797f164 in gst_multi_queue_chain (pad=0x8a4fd80, buffer=0x8d37ac0) at gstmultiqueue.c:1041
#4  0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a4fd80, is_buffer=1, data=0x8d37ac0) at gstpad.c:4042
#5  0xb7ee0d27 in gst_pad_push_data (pad=0x8a4fcb8, is_buffer=1, data=0x8d37ac0) at gstpad.c:4271
#6  0xb7ee12b9 in gst_pad_push (pad=0x8a4fcb8, buffer=0x8d37ac0) at gstpad.c:4375
#7  0xb78f628b in gst_mpeg_demux_send_subbuffer (mpeg_demux=0x8a4c000, outstream=0x8a4f358, buffer=0x8d32158, timestamp=18446744073709551615, offset=9, size=2025)
    at gstmpegdemux.c:1097
#8  0xb78fa820 in gst_dvd_demux_send_subbuffer (mpeg_demux=0x8a4c000, outstream=0x8a4f358, buffer=0x8d32158, timestamp=18446744073709551615, offset=9, size=2025)
    at gstdvddemux.c:1046
#9  0xb78f5640 in gst_mpeg_demux_parse_pes (mpeg_parse=0x8a4c000, buffer=0x8d32158) at gstmpegdemux.c:942
#10 0xb78f077f in gst_mpeg_parse_chain (pad=0x8a36258, buffer=0x8d32158) at gstmpegparse.c:760
#11 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a36258, is_buffer=1, data=0x8d31f30) at gstpad.c:4042
#12 0xb7ee0d27 in gst_pad_push_data (pad=0x8a36190, is_buffer=1, data=0x8d31f30) at gstpad.c:4271
#13 0xb7ee12b9 in gst_pad_push (pad=0x8a36190, buffer=0x8d31f30) at gstpad.c:4375
#14 0xb797b5dc in gst_type_find_element_chain (pad=0x8a360c8, buffer=0x8d31f30) at gsttypefindelement.c:698
#15 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a360c8, is_buffer=1, data=0x8d31f30) at gstpad.c:4042
#16 0xb7ee0d27 in gst_pad_push_data (pad=0x8a3a030, is_buffer=1, data=0x8d31f30) at gstpad.c:4271
#17 0xb7ee12b9 in gst_pad_push (pad=0x8a3a030, buffer=0x8d31f30) at gstpad.c:4375
#18 0xb7ec4a6b in gst_proxy_pad_do_chain (pad=0x8a39830, buffer=0x8d31f30) at gstghostpad.c:179
#19 0xb7ee01f1 in gst_pad_chain_data_unchecked (pad=0x8a39830, is_buffer=1, data=0x8d31f30) at gstpad.c:4042
#20 0xb7ee0d27 in gst_pad_push_data (pad=0x8a36000, is_buffer=1, data=0x8d31f30) at gstpad.c:4271
---Type <return> to continue, or q <return> to quit---
#21 0xb7ee12b9 in gst_pad_push (pad=0x8a36000, buffer=0x8d31f30) at gstpad.c:4375
#22 0xb7935fcb in gst_base_src_loop (pad=0x8a36000) at gstbasesrc.c:2323
#23 0xb7f0724d in gst_task_func (task=0x8a500c8) at gsttask.c:234
#24 0xb7f084c1 in default_func (tdata=0x8a32698, pool=0x89c9010) at gsttaskpool.c:70
#25 0xb7c62e26 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0xb7c617bf in ?? () from /usr/lib/libglib-2.0.so.0
#27 0xb7bdd4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#28 0xb7b5749e in clone () from /lib/tls/i686/cmov/libc.so.6

(gdb) thread 6
[Switching to thread 6 (Thread 0xb78c2b90 (LWP 8327))]#0  0xb7f59430 in __kernel_vsyscall ()
(gdb) bt
#0  0xb7f59430 in __kernel_vsyscall ()
#1  0xb7be10e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7edfa0c in handle_pad_block (pad=0x8a47100) at gstpad.c:3879
#3  0xb7ee2768 in gst_pad_push_event (pad=0x8a47100, event=0x89cb800) at gstpad.c:4795
#4  0xb7ec4908 in gst_proxy_pad_do_event (pad=0x8a3a1e0, event=0x89cb800) at gstghostpad.c:128
#5  0xb7ee2fb3 in gst_pad_send_event (pad=0x8a3a1e0, event=0x89cb800) at gstpad.c:4962
#6  0xb7ee28b2 in gst_pad_push_event (pad=0x8a36708, event=0x89cb800) at gstpad.c:4818
#7  0xb797e87f in gst_single_queue_push_one (mq=0x8a4e818, sq=0x8a4e2e0, object=0x89cb800) at gstmultiqueue.c:829
#8  0xb797ee9b in gst_multi_queue_loop (pad=0x8a36708) at gstmultiqueue.c:978
#9  0xb7f0724d in gst_task_func (task=0x8a50040) at gsttask.c:234
#10 0xb7f084c1 in default_func (tdata=0x8a32808, pool=0x89c9010) at gsttaskpool.c:70
#11 0xb7c62e26 in ?? () from /usr/lib/libglib-2.0.so.0
#12 0xb7c617bf in ?? () from /usr/lib/libglib-2.0.so.0
#13 0xb7bdd4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#14 0xb7b5749e in clone () from /lib/tls/i686/cmov/libc.so.6
