>I just got this panic on my 1.4G i386, while closing connection to a remote
>system (so either ssh or the xterm in which it was running was exiting):
>
>pmap_page_remove: pg=0xf0311c94: va=3a000, pv_ptp=0xf0353550
>pmap_page_remove: PTP's phys addr: actual=0, recorded=31a4000
>panic: pmap_page_remove: mapped managed page has invalid pv_ptp field
>syncing disks... 10 10 4 done

I've seen the same thing on my 1.3I i386 except that I wasn't running ssh.  I've seen it while running Netscape and Emacs at the same time on a 32MB Celeron system.