interesting bug in free

[Kip Macy <kmacy@xxxxxxxxxxx>]

If this has been fixed by the latest slab cache changes let me know:
panic: lwkt_send_ipiq: UP box!
db> trace
lwkt_send_ipiq
free
elf_puttextvp
elf_puthdr
elf_corehdr
generic_elf_coredump
elf_coredump
coredump
sigexit
postsig


It may also be caused by my local changes, but I haven't seen this
before.