Program received signal SIGSEGV, Segmentation fault.
0xb6c20b00 in nettle_yarrow256_update ()
   from /usr/lib/arm-linux-gnueabihf/libnettle.so.6
(gdb) bt
#0  0xb6c20b00 in nettle_yarrow256_update ()
   from /usr/lib/arm-linux-gnueabihf/libnettle.so.6
#1  0xb6bd6406 in ?? () from /usr/lib/arm-linux-gnueabihf/libgnutls-deb0.so.28
Backtrace stopped: previous frame identical to this frame (corrupt stack?)