.
Thread 1 (Thread 0xb78036c0 (LWP 918)):
#0  0x005f3656 in _int_free (av=0x6fd400, p=0x8cbcd50) at malloc.c:4973
        size = 4616
        fb = <optimized out>
        nextchunk = <optimized out>
        nextsize = 8200
        nextinuse = 0
        prevsize = <optimized out>
        bck = 0x0
        fwd = 0x0
        errstr = 0x0
        __func__ = "_int_free"
#1  0x005f694d in __GI___libc_free (mem=0x8cbcd58) at malloc.c:3738
        ar_ptr = 0x6fd400
        p = <optimized out>
        hook = <optimized out>
#2  0x0035686c in mad_frame_finish () from /usr/lib/libmad.so.0
No symbol table info available.
#3  0x08cbcd58 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)