Checksum errors when using copy-in

Binary package hint: cpio

Using
* Ubuntu Karmic on amd64
* cpio 2.10-1ubuntu1

I'm getting checksum errors when extracting large (>2GB) files from a cpio archive.

This could be a regression of http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=335580 - all >2GB files that I checked after the restore had that checksum error.
The original files don't exist anymore, so I hope it's the checksum that's wrong...

I thought I couldn't reproduce the error for lack of the originals, but now it occurs to me I could try packing and extracting one of the large files and check if they come back out correct. I'll do that as I find the time.