rsync using krb5 vs. ssh

[Earl Killian]

rsync 2.5.5 (and previous versions) does not operate reliably for me
when I use MIT's Kerberos5-1.2.4 rsh, but it does when I use ssh.

Can anyone think of a reason?  Here's the last error message I got
trying it:

unexpected tag 117
rsync error: error in rsync protocol data stream (code 12) at io.c(298)
Exit 12

Just a wild guess: could it be that the read and write system calls in
rsync aren't handling EINTR properly?  This is one of the few things I
can think of that would differ between various transports.