#0  malloc_printerr (ar_ptr=0x657565, ptr=<optimised out>, str=0x7f9f9351bdac "free(): invalid size", action=3) at malloc.c:4994
No locals.
#1  _int_free (av=0x657565, p=<optimised out>, have_lock=0) at malloc.c:3868
        size = <optimised out>
        fb = <optimised out>
        nextchunk = <optimised out>
        nextsize = <optimised out>
        nextinuse = <optimised out>
        prevsize = <optimised out>
        bck = <optimised out>
        fwd = <optimised out>
        errstr = <optimised out>
        locked = <optimised out>
#2  0x00007f9f93411c5c in __GI___libc_free (mem=<optimised out>) at malloc.c:2969
        ar_ptr = <optimised out>
        p = <optimised out>
        hook = <optimised out>
#3  0x00007f9f741c35d8 in ?? () from /usr/lib/x86_64-linux-gnu/unity-control-center-1/panels/libsound.so
No symbol table info available.
#4  0x00007f9f93c98a5a in g_cclosure_marshal_VOID__STRINGv () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#5  0x00007f9f93c961d4 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#6  0x00007f9f93cb09a6 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#7  0x00007f9f93cb108f in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#8  0x00007f9f93f9c0cc in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#9  0x00007f9f8f006e40 in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#10 0x00007f9f8f0068ab in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
No symbol table info available.
#11 0x00007f9f93c96cf5 in g_cclosure_marshal_generic_va () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#12 0x00007f9f93c961d4 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#13 0x00007f9f93cb04b8 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#14 0x00007f9f93cb108f in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#15 0x00007f9f93f9c838 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#16 0x00007f9f93f9744a in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#17 0x00007f9f939befda in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#18 0x00007f9f939bf380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#19 0x00007f9f939bf42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#20 0x00007f9f93f86ccd in g_application_run () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#21 0x0000000000407503 in main ()
No symbol table info available.