bug multimedia/ffmpeg libavcodec crashes with Bus error on i386 and beaglebone when using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX (i386) or ARMv6 NEON (beaglebone black)

[Otacílio]

Dears

I'm trying debug the bug 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205958 I have found 
that the bus error occurs at:

0x29671740 <x264_add8x8_idct_avx2.skip_prologue+12488>: lds    (bad),%edi

Sorry by my newbie question, but how can I do to find the file where the source of this code is?

Thanks a lot

-Otacilio