With today's source code (13:36 UTC), I just built a kernel, booted and got:

panic: kernel diagnostic assertion "l->l_holdcnt == 0" failed: file
  "../../../../arch/i386/i386/syscall.c", line 165

Stopped in ... swapctl

Unfortunately, no core dump.. (Is it possible when the dump device is much
smaller than memory?)

Aug 16th kernel works fine. I don't really have much to go on.. :/

Cheers,

Patrick