ACPI crashes amd64 kernel built 1 hour ago

I get a panic from ACPI now every time:

Page fault accessing 0xc00000023 PC is at AcpiUtAcquireFromCache+0x75

(gdb) l *AcpiUtAcquireFromCache+0x75
0xffffffff80190915 is in AcpiUtAcquireFromCache
(/usr/src/sys/contrib/dev/acpica/utalloc.c:224).
219         if (CacheInfo->ListHead)
220         {
221             /* There is an object available, use it */
222
223             Object = CacheInfo->ListHead;
224             CacheInfo->ListHead = *(ACPI_CAST_INDIRECT_PTR (char,
&(((char *) Object)[CacheInfo->LinkOffset])));
225
226             ACPI_MEM_TRACKING (CacheInfo->CacheHits++);
227             CacheInfo->CacheDepth--;
228


kernel built Sunday Nov 21 works perfectly.

Cheers,
Sean