DELL PowerEdge 2850 and FreeBSD 5.4

[Danny Cooper]

I have installed FreeBSD 5.4 RELEASE and upgraded to -STABLE on a DELL
PE2850. 

FreeBSD 5.4-STABLE #1: Wed May 25 23:43:12 BST 2005
CPU: Intel(R) Xeon(TM) CPU 3.20GHz (3192.22-MHz 686-class CPU)
real memory  = 5100273664 (4864 MB)
avail memory = 4189892608 (3995 MB)
MPTable: <DELL     PE 016D     >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID:  0
cpu1 (AP): APIC ID:  6
amr0: <LSILogic PERC 4e/Di> Firmware 516A, BIOS H418, 256MB RAM 

I have disabled ACPI HTT and enabled PAE to make the whole system memory
available. 

However the problem I have is the system can crash at any moment, and is not
load related. As the crash info below is when the machine was in an 100%
idle state. 

##### Crash Info ##########
login: 

kernel trap 12 with interrupts disabled 


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x24
fault code        = supervisor read, page not present
instruction pointer     = 0x8:0xc031f64b
stack pointer           = 0x10:0xeab21c64
frame pointer           = 0x10:0xeab21c78
code segment      = base 0x0, limit 0xfffff, type 0x1b
                 = DPL 0, pres 1, def32 1, gran 1
processor eflags  = resume, IOPL = 0
current process   = 8 (pagedaemon)
trap number       = 12
panic: page fault
cpuid = 0
boot() called on cpu#0
Uptime: 12h31m11s
Cannot dump. No dump device defined.
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
cpu_reset called on cpu#0
cpu_reset: Stopping other CPUs
spin lock sched lock held by 0xc63f8c00 for > 5 seconds 

############################# 

I have tried to install other versions of FreeBSD. 

4.11 Release (Doesn't see all available memory even with a kernel patch)
5.4 Release (Crashes at random times, but mainly under load, running squid) 


Does anyone have similar problems or have found a work around? 


Danny C