[Libguestfs] [nbdkit] can't import mmap

Hi, I'm new to nbdkit and am trying to run a simple "single file block device using mmap" setup, using this python script: import mmap def config(key, value): print ("ignored parameter %s=%s" % (key, value)) def open(readonly): print ("open: readonly=%d" % readonly) f = open("disk","r+") m = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_WRITE) return (f,m) def get_size(h): size = 1024*1024 def pread(h, count, offset): (f,m) = h bytes = bytearray(m[offset:offset+count]) return bytes def pwrite(h, buf, offset): (f,m) = h m[offset:offset+len(buf)] = bytearray(buf) When I run this: /usr/sbin/nbdkit -f -v python script=single_file.py I get this error: nbdkit: debug: registering /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so nbdkit: debug: registered /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so (name python) nbdkit: debug: /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so: load nbdkit: debug: /usr/lib/x86_64-linux-gnu/nbdkit/plugins/nbdkit-python-plugin.so: config key=script, value=single_file.py Traceback (most recent call last): File "single_file.py", line 1, in <module> import mmap ImportError: /usr/lib/python2.7/lib-dynload/mmap.x86_64-linux-gnu.so: undefined symbol: PyExc_SystemError nbdkit: error: single_file.py: error running this script Any ideas? Thanks, Jason Pepas