Q. Can I share my home partition between GNU/Linux and GNU/kFreeBSD?

A. Yes, but you must use ext2fs. ufs (either 1 or 2) are not supported in any version of Linux (the kernel). When creating the filesystem, pass "-O none" to mke2fs for best results.

For ext3fs, kFreeBSD can only access it in readonly mode.

There are patches for reiserfs (see #335019) and xfs (#335020) support around, but we haven't integrated them in our kernels yet.