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.