I strongly believe that line:80 of fldsp.cpp should be blksz = sys_getblksize(); // is this guaranteed to be the same as sys_getblksize() ? instead of blksz = sp[0]->s_n; // is this guaranteed to be the same as sys_getblksize() ? which answers also the question in the comment. OTHERWISE: Crash during DspSetup() (for me atleast)