CMUCL broken on FreeBSD-CURRENT

Hello,

as I wanted to port an application to cmucl, I noticed that
it errors in
its SEGV handler, when compiling ASDF. See the following
transcript. Please keep me in Cc: as I am not subscribed to
this group.

(This is with CMUCL 19c installed from FreeBSD ports on a
FreeBSD-CURRENT from January. But also happens with 19b on
newer
CURRENTs. My ASDF is revision 1.88.)