Dear Andreas, Harald, I don't really know much about the bit order of TRAU frames but the trau_test.c is causing an out of bounds access to the gsm_fr_map. Re-produce (GCC >= 3.8 or clang >= 3.2 required): $ make clean && make CFLAGS+="-ggdb3 -Og -fsanitize=address" $ cd tests/trau $ ./trau_test Issue: Breakpoint 1, 0xb69e7810 in __asan_report_error () from /usr/lib/i386-linux-gnu/libasan.so.0 (gdb) bt #0 0xb69e7810 in __asan_report_error () from /usr/lib/i386-linux-gnu/libasan.so.0 #1 0xb69e08cf in __asan_report_load1 () from /usr/lib/i386-linux-gnu/libasan.so.0 #2 0x0804c4e7 in trau_encode_fr (tf=tf@entry=0xbffff530, data=data@entry=0xbffff700 <incomplete sequence \320>) at trau_mux.c:441 #3 0x08048e06 in test_trau_fr_efr (data=<optimized out>, data@entry=0xbffff700 <incomplete sequence \320>) at trau_test.c:35 #4 0x080494bf in main () at trau_test.c:70 (gdb) frame2 Undefined command: "frame2". Try "help". (gdb) frame 2 #2 0x0804c4e7 in trau_encode_fr (tf=tf@entry=0xbffff530, data=data@entry=0xbffff700 <incomplete sequence \320>) at trau_mux.c:441 441 k = gsm_fr_map[++l]-1; (gdb) p l $1 = 76 (gdb) p l $2 = 76 (gdb) p sizeof(gsm_fr_map) $3 = 76 Please fix as soon as possible as I would like to enable ASAN checking on the jenkins as soon as possible. kind regards holger