With 2.0-BETA5 (i386) built on Tue Jan 11 14:19:18 EST 2011
I got this on system logs:
kernel: pid 48457 (rrdtool), uid 0: exited on signal 11 (core dumped)
rrd graphs seems to be working anyway.
I've seen that happen when a package reinstall didn't go quite right, but it should be OK after a reboot.
It is odd, though.