Can't login to 5.2-RC1, must hard reboot

My server locks up every few days, mysql and other process are still  
running, I can ping the machine, however I cannot login.

Even when I login using the console, i can enter my name for the login,  
then it just hangs.

A few questions: my kernel does not have maxusers set, does it need to  
be set?  Is this even still around in FreeBSD 5.2?

I get the following error messages in my logfile, a lot.

Feb  7 18:40:22 cooper sshd[806]: set class 'me' resource limit  
datasize: Operation not permitted
Feb  7 18:40:22 cooper sshd[806]: set class 'me' resource limit  
stacksize: Operation not permitted
Feb  7 18:40:22 cooper sshd[806]: set class 'me' resource limit  
maxproc: Operation not permitted
Feb  7 18:40:22 cooper sshd[806]: set class 'me' resource limit  
openfiles: Operation not permitted

Here is my limit table:
cooper:/usr/src/sys/i386/conf$ limits
Resource limits (current):
   cputime          infinity secs
   filesize         infinity kb
   datasize           524288 kb
   stacksize           65536 kb
   coredumpsize     infinity kb
   memoryuse        infinity kb
   memorylocked     infinity kb
   maxprocesses         5547
   openfiles           11095
   sbsize           infinity bytes
   vmemoryuse       infinity kb

Any clues as to what's going on would be GREATLY appreciated.

And my dmesg:
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
         The Regents of the University of California. All rights  
reserved.
FreeBSD 5.2.1-RC #3: Tue Feb  3 14:08:24 EST 2004
     david_at_cooper.xxxxxxxxx.edu:/usr/obj/usr/src/sys/COOPER
Preloaded elf kernel "/boot/kernel/kernel" at 0xc08a6000.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc08a61f4.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2392.26-MHz 686-class CPU)
   Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
    
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE 
,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
   Hyperthreading: 2 logical CPUs
real memory  = 4026466304 (3839 MB)
avail memory = 3913224192 (3731 MB)
ACPI APIC Table: <DELL   PE2650  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  2
  cpu3 (AP): APIC ID:  3
ioapic0: Changing APIC ID to 4
ioapic1: Changing APIC ID to 5
ioapic2: Changing APIC ID to 6
ioapic0 <Version 1.1> irqs 0-15 on motherboard
ioapic1 <Version 1.1> irqs 16-31 on motherboard
ioapic2 <Version 1.1> irqs 32-47 on motherboard
Pentium Pro MTRR support enabled
npx0: [FAST]
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <DELL   PE2650  > on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
pcibios: BIOS version 2.10
Using $PIR table, 9 entries at 0xc00fc480
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_cpu1: <CPU> on acpi0
acpi_cpu2: <CPU> on acpi0
acpi_cpu3: <CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib0: slot 15 INTA is routed to irq 5
pci0: <unknown> at device 4.0 (no driver attached)
pci0: <unknown> at device 4.1 (no driver attached)
pci0: <unknown> at device 4.2 (no driver attached)
pci0: <display, VGA> at device 14.0 (no driver attached)
atapci0: <ServerWorks CSB5 UDMA100 controller> port  
0x8b0-0x8bf,0x8d8-0x8db,0x8d0-0x8d7,0x8c8-0x8cb,0x8c0-0x8c7 at device  
15.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: simplex device, DMA on primary only
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]
ohci0: <OHCI (generic) USB controller> mem 0xfe100000-0xfe100fff irq 5  
at device 15.2 on pci0
usb0: OHCI version 1.0, legacy support
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: (0x1166) OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
isab0: <PCI-ISA bridge> at device 15.3 on pci0
isa0: <ISA bus> on isab0
pcib1: <ACPI Host-PCI bridge> on acpi0
pci4: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> at device 8.0 on pci4
pci5: <ACPI PCI bus> on pcib2
pci5: <mass storage, SCSI> at device 6.0 (no driver attached)
pci5: <mass storage, SCSI> at device 6.1 (no driver attached)
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 30 at device 8.1  
on pci4
aac0: [MPSAFE]
aac0: i960RX 100MHz, 118MB cache memory, optional battery present
aac0: Kernel 2.7-1, Build 3170, S/N 7041d3
aac0: Supported  
Options=75c<WCACHE,DATA64,HOSTTIME,WINDOW4GB,SOFTERR,NORECOND,SGMAP64>
pcib3: <ACPI Host-PCI bridge> on acpi0
pci3: <ACPI PCI bus> on pcib3
bge0: <Broadcom BCM5701 Gigabit Ethernet, ASIC rev. 0x105> mem  
0xfcf10000-0xfcf1ffff irq 28 at device 6.0 on pci3
bge0: Ethernet address: 00:06:5b:fe:53:81
miibus0: <MII bus> on bge0
brgphy0: <BCM5701 10/100/1000baseTX PHY> on miibus0
brgphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX,  
1000baseTX-FDX, auto
bge1: <Broadcom BCM5701 Gigabit Ethernet, ASIC rev. 0x105> mem  
0xfcf00000-0xfcf0ffff irq 29 at device 8.0 on pci3
bge1: Ethernet address: 00:06:5b:fe:53:82
miibus1: <MII bus> on bge1
brgphy1: <BCM5701 10/100/1000baseTX PHY> on miibus1
brgphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX,  
1000baseTX-FDX, auto
pcib4: <ACPI Host-PCI bridge> on acpi0
pci2: <ACPI PCI bus> on pcib4
pcib5: <ACPI Host-PCI bridge> on acpi0
pci1: <ACPI PCI bus> on pcib5
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> port  
0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
sio1 port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
orm0: <Option ROMs> at iomem  
0xec000-0xeffff,0xc8000-0xcbfff,0xc0000-0xc7fff on isa0
pmtimer0 on isa0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on  
isa0
Timecounters tick every 10.000 msec
acd0: CDROM <TEAC CD-ROM CD-224E> at ata0-master PIO4
aacd0: <RAID 1 (Mirror)> on aac0
aacd0: 139998MB (286716672 sectors)
GEOM: create disk aacd0 dp=0xcaf77a8c
aacd1: <RAID 1 (Mirror)> on aac0
aacd1: 139998MB (286716672 sectors)
GEOM: create disk aacd1 dp=0xcaf7798c
SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
Mounting root from ufs:/dev/aacd0s2a
WARNING: / was not properly dismounted
WARNING: /tmp was not properly dismounted
WARNING: /usr was not properly dismounted
/usr: mount pending error: blocks 9552 files 2
WARNING: /var was not properly dismounted
/var: mount pending error: blocks 12 files 0
WARNING: /www was not properly dismounted
aac0: **Monitor** Battery charge is now OK
handle_workitem_freeblocks: block count
handle_workitem_freeblocks: block count