Bug 25136

Since i've updated my system yesterday from 4.2 Stable january 31. my 
Adaptec 3940auw(Dual Channel / Bios Ver. 2.11.0) causes a fatal trap 12 while booting.
if the Controller is not in the system, or i replace it with another
Adaptec Controller(2940uw tested) there is no problem. also with the
old kernel i can boot without problem. We tested finally with an IDE hd
and no scsi devices connected to the controller.
in the kernel script the following stuff is defined:
- pci
- ahc
- da
- scbus
- pass

the trap message is:

fault virtual address   = 0x123
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc012de26
stack pointer           = 0x10:0xc0293a8c
frame pointer           = 0x10:0xc0293ab4
code segment            = base rx0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (swapper)
interrupt mask          = cam
trap number             = 12
panic: page fault

all this happens when normally this message is shown:
waiting 2 seconds for SCSI devices to settle

Fix: 

use an other controller :(
How-To-Repeat: put a Adaptec 3940auw controller in your system, update and reboot