Of course not, this clearly is a bug.
Nowadays I don't take such things for granted any more...
[And I guess you did not really intend to mail it to this pkgsrc list?]
<facepalm/> No, of course this was meant for netbsd-users...
(or file a PR with enough details).
I just opened kern/55628. I hope I provided enough details. I still have the crash dump files (kernel and core). And I can easily reproduce them: I tried this on a second machine (running the same kernel), and it also crashed.