Cvs-fast-export ends with a segmentation violation

Our CVS is on a solaris machine. So i created a virtual box using wsl, with ubuntu on it.
after copying over the cvs repo, i ran the csv-fast-export
I ran
find . | cvs-fast-export >
now… i know i didn’t put any flags on it. Not sure if that’s part of the problem.
however, it seems to be working for about an hour or so…
it eventually dies with a segmentation fault (core dump)
the has about 126 meg in it.

Any ideas?
do i need to specify some flags on the csv-fast-export command?
not real familiar with doing this migration…
any help would be appreciated