I have encountered the same issue with a similar setup:

Ubuntu: 8.0.4 + updates
Hardware: HP DL360 (Pentium 4 based Xeon, unsure of DLP "generation")

I am bonding with the onboard NIC, which is (a dual PHY?) Broadcom:
02:02.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit 
Ethernet (rev 10)
02:02.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit 
Ethernet (rev 10)

My bonding config (in /etc/modprobe.d/bonding):
options bond0 mode=4 lacp_rate=1 miimon=100

Machine is basically locked, I see this message repeated at the console:
BUG: soft lockup - CPU#1 stuck for 11s! [bond0:3980]

I don't see any OOPS type info, nor a stack trace.  (though I can't get
into machine to view syslog)

The machine had locked on me last weekend also, though I was unable to
activate/view the console so I don't know if it was the same problem or
not. I was running the -xen kernel at the time.

When I am able to reboot the machine, I will run memtest on it, but as
it's a production machine, and it takes 5+ days to error, I'm not sure
if I'll be able to do much tinkering to figure out the problem.  (I'll
probably just drop bonding for the time being.)

Bob Black

-- 
Server 8.04 LTS: soft lockup - CPU#1 stuck for 11s! [bond1:3795]
https://bugs.launchpad.net/bugs/245779
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