Bug 71144

I got this durig the boot process:
---8<---
ad0: TIMEOUT - READ_DMA retrying (bla retries left) LBA=78140097
ATAPI_RESET time 2030us
[...]
ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=78140097
ATAPI_RESET time 2040us
ATAPI_RESET time 2040us
ad0: FAILURE - READ_DMA timed out


Fatal trab 12: page fault while in kernel mode
cpuid = 0: apic id = 00
fault virtual address = 0xdeadc0de
fault code = supervisor read, page not present
instruction pointer = 0x8:0xdeadc0de
stack pointer = 0x10:0xc8298ca4
frame pointer = 0x10:0xc8298cb0
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 = 5 (thread taskq)
[thread 100035]
Stopped at 0xdeadc0de: *** error reading from address deadc0de ***
db>
--->8---

My system is a Compaq Armada 7300 with an 150MHz Pentium MMX, 128MB Kingston minisd-edo-ram, 40GB Fujitsu HDD connected to the internal Triflex controller.

Fix: 

No solution found.
How-To-Repeat: Everytime, using the FBSD5.3b2 image got at 29th August from ftp1.de.freebsd.org. Also then enter "reset" in the debugers command line and booting FBSD5.2.1-CURRENT kernel. But never happend when doing a cold-reset (Switching off and on or eg.)