RTAPI: Task 1[f5fbc000]: Fault with vec=14, signo=11 ip=fc4cad71.
[ 5791.438156] RTAPI: This fault may not be recoverable without rebooting.



andypugh@mill:~/emc2-dev/src$ addr2line -e hm2_pci.ko 0xd71
/usr/src/linux-headers-2.6.32-122-rtai/arch/x86/include/asm/string_32.h:35

Line 35 of string_32.h is:
asm volatile("rep ; movsl\n\t

which seems unlikely to be the problem.