Hi, My MacBookPro 5,1 does not boot using -current because memory inside the ACPI kernel module is used after free. The following patch temporily mitigates the problem: /usr/src/sys/dev/acpica/Osd/OsdMemory.c void AcpiOsFree(void *Memory) { + if (cold == 0) free(Memory, M_ACPICA); } Is there any way to debug this from user-land? --HPS