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libvisual: crashes when multiple libvisual elements used at the same time

Submitted by Georg

Link to original bug (#684083)

Description

Created attachment 224401
several pipelines with a libvisual element

If you create several pipelines with libvisual in it, the program sometimes segfaults.
The more pipelines you create, the faster it segfaults.

backtrace:

#0  0x00007ffff47839e3 in visual_dft_perform () from /usr/lib/libvisual-0.4.so.0  
#1  0x00007ffff478016d in visual_audio_get_spectrum_for_sample () from /usr/lib/libvisual-0.4.so.0  
#2  0x00007fffe76bd655 in act_oinksie_render () from /usr/lib/libvisual-0.4/actor/actor_oinksie.so  
#3  0x00007ffff4774cd7 in visual_actor_run () from /usr/lib/libvisual-0.4.so.0  
#4  0x00007ffff4bed2b1 in ?? () from /usr/lib/gstreamer-1.0/libgstlibvisual.so  
#5  0x00007ffff4befa03 in ?? () from /usr/lib/gstreamer-1.0/libgstlibvisual.so  
#6  0x00007ffff7b45f78 in ?? () from /usr/lib/libgstreamer-1.0.so.0  
#7  0x00007ffff533058a in ?? () from /usr/lib/libgstbase-1.0.so.0  
#8  0x00007ffff7b45f78 in ?? () from /usr/lib/libgstreamer-1.0.so.0  
#9  0x00007ffff533058a in ?? () from /usr/lib/libgstbase-1.0.so.0  
#10 0x00007ffff7b45f78 in ?? () from /usr/lib/libgstreamer-1.0.so.0  
#11 0x00007ffff53281b5 in ?? () from /usr/lib/libgstbase-1.0.so.0  
#12 0x00007ffff7b73f11 in ?? () from /usr/lib/libgstreamer-1.0.so.0  
#13 0x00007ffff70028e2 in ?? () from /usr/lib/libglib-2.0.so.0  
#14 0x00007ffff70020e5 in ?? () from /usr/lib/libglib-2.0.so.0  
#15 0x00007ffff6d83e0f in start_thread () from /usr/lib/libpthread.so.0  
#16 0x00007ffff6abb45d in clone () from /usr/lib/libc.so.6

Attachment 224401, "several pipelines with a libvisual element":
gst-libvisual-test.c

Version: 1.x