cat backtrace3.log 
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Reading symbols from /usr/bin/sonic...
Reading symbols from /usr/lib/debug/usr/bin/sonic.debug...
[New LWP 1941]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `sonic -s 2.0 file.wav file2.wav'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  musable (mem=0x55b51032bc30) at malloc.c:5236
5236	  else if (inuse (p))

Thread 1 (Thread 0x7f1ae0dbf740 (LWP 1941)):
#0  musable (mem=0x55b51032bc30) at malloc.c:5236
        p = 0x55b51032bc20
        p = <optimized out>
#1  __GI___libc_realloc (oldmem=0x55b51032bc30, bytes=35476) at malloc.c:3433
        ar_ptr = <optimized out>
        nb = <optimized out>
        newp = <optimized out>
        oldp = 0x55b51032bc20
        usable = <optimized out>
        oldsize = <optimized out>
        __PRETTY_FUNCTION__ = "__libc_realloc"
#2  0x000055b4fd83aae9 in sonicRealloc (p=0x55b51032bc30, oldNum=3566, newNum=8869, size=4) at sonic.c:129
No locals.
#3  0x000055b4fd83b384 in enlargeInputBufferIfNeeded (stream=0x55b510326af0, numSamples=3520) at sonic.c:486
        inputBufferSize = 3566
#4  0x000055b4fd83bb95 in sonicFlushStream (stream=0x55b510326af0) at sonic.c:700
        maxRequired = 1356
        remainingSamples = 808
        speed = 2
        rate = 1
        expectedOutputSamples = 404
#5  0x000055b4fd83a4d0 in runSonic (inFileName=0x7fff6086b3b1 "file.wav", outFileName=0x7fff6086b3ba "file2.wav", speed=2, pitch=1, rate=1, volume=1, outputSampleRate=0, emulateChordPitch=0, quality=0, computeSpectrogram=0, numRows=0, numCols=0) at main.c:57
        inFile = 0x55b510324890
        outFile = 0x55b510325ab0
        stream = 0x55b510326af0
        inBuffer = {8, 20, 14, 2, 15, 9, 19, 7, 12, 6, 18, 8, -3, 7, 9, 7, 11, -3, 16, -5, 13, 11, 9, -2, 19, 10, 33, 2, 17, -3, -6, -11, 14, -10, 3, -12, 7, -6, 27, 0, 3, -7, 27, -4, 14, -4, 15, 10, 33, -3, 8, -7, 7, 2, 7, -4, 30, -6, 14, 8, 11, -7, 25, 0, 20, -12, 16, -8, -4, -4, 11, -3, 14, 2, -7, -14, -7, 0, -5, -13, 0, -6, 3, -9, -1, -22, -5, -23, -7, -29, -1, -32, -4, -20, 1, -10, 2, -18, 2, -23, -3, -16, 18, -22, 10, -17, 5, -27, 8, -28, -5, -18, -6, -24, -22, -22, 0, -21, -3, -9, 3, -23, -7, -21, -3, -21, 1, -16, 4, -23, 3, -26, 9, -11, -2, -16, 14, -5, 1, -10, 19, -20, 12, -2, 15, -19, 9, -23, 3, -14, 5, -11, 7, -4, -9, -18, 3, 0, 4, -8, 16, -3, -13, -15, 1, -14, 6, -7, 12, 5, 17, -5, 4, 3, 10, -24, 15, -6, 7, -13, -2, -3, 7, -10, -11, -7, 8, -18, 6, -6, -7, -18, 3, -17, 0, -21, -19, -29, -26, -11...}
        outBuffer = {4, 0, -4, 4, 2, 2, 3, 0, 6, 4, 23, 7, 14, 6, 8, 12, 8, 15, 9, 6, 11, 1, 10, 10, 10, 0, 4, 14, 15, 7, 18, 12, 11, 0, 15, 7, 7, 3, 3, 5, 5, -3, -6, 0, 2, 0, 1, -2, 9, -4, 6, -1, -2, 4, 4, -6, 9, -1, -3, -6, -1, -5, -10, -10, -5, -5, -6, -7, 3, -12, 3, -10, -4, -7, -4, 1, -5, -5, -1, -9, -6, -7, -3, -3, -3, -3, -3, -6, -8, -4, -7, -9, -8, -5, -3, -10, -17, -10, -7, -9, -15, -12, -12, -10, -13, -6, -19, -17, -19, -16, -10, -13, -7, -11, -17, -7, -13, -13, -7, -15, -7, -9, -5, -13, -15, -17, -13, -8, -15, -10, -17, -7, -14, -10, -15, -11, -10, -4, -14, -14, -13, -5, -8, -2, -13, -6, -11, -11, -11, -10, -17, -15, -19, -12, -20, -20, -21, -12, -16, -19, -19, -19, -20, -19, -12, -12, -16, -8, -21, -15, -10, -11, -17, -17, -18, -15, -16, -15, -14, -15, -11, -12, -20, -16, -13, -12, -8, -4, -9, -13, -12, -9, -10, -14, -15, -15, -14, -16, -11, -14...}
        sampleRate = 44100
        numChannels = 2
        samplesRead = 0
        samplesWritten = 0
#6  0x000055b4fd83aa8a in main (argc=5, argv=0x7fff6086a238) at main.c:184
        inFileName = 0x7fff6086b3b1 "file.wav"
        outFileName = 0x7fff6086b3ba "file2.wav"
        speed = 2
        pitch = 1
        rate = 1
        volume = 1
        outputSampleRate = 0
        emulateChordPitch = 0
        quality = 0
        xArg = 3
        computeSpectrogram = 0
        numRows = 0
        numCols = 0