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Description of problem:
I have got one XEN instance called "gateway" running; it owns the ipw3945 
device to route WLAN traffic to the internal eth:
---snip ---
[root@t60p-jschrode ~]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0     1756     2 r-----     61.3
gateway                                    3      256     1 -b----     18.2

[root@t60p-jschrode ~]# cat /data/xen/gateway.xencfg
# xen config file

# this is a paravirtualized guest
name = "gateway"
memory = "256"
uuid = "8223c51d-3059-07fd-7236-6c324403cbcb"

# installation time:
#kernel="/inst/images/xen/vmlinuz"
#ramdisk="/inst/images/xen/initrd.img"
# for installation while being connected to a network with DHCP, remove the ip 
and netmask parts in the following line:
#extra="ks=http://192.168.60.1/ks/gateway/gateway-ks.cfg ip=192.168.60.254 
netmask=255.255.255.0"
#extra="ks=http://gateway.demo.redhat.com/cobbler/kickstarts/rhel5s-xen/ks.cfg"
#extra="linux rescue"
#on_reboot   = 'destroy'

# installed system:
bootloader="/usr/bin/pygrub"
on_reboot   = 'restart'

# PCI hideback for LAN and WLAN
#pci = [ '02:00.0' , '03:00.0' ]
# WLAN only
pci = [ '03:00.0' ]

# installation time:
#disk = 
[ 'phy:/dev/VolGroup00/gateway.boot,xvda,w', 'phy:/dev/VolGroup00/gateway.root,xvdb,w', 'phy:/dev/VolGroup00/gateway.swap,xvdd,w', ]
# installed system:
disk = 
[ 'phy:/dev/VolGroup00/gateway.boot,xvda,w', 'phy:/dev/VolGroup00/gateway.root,xvdb1,w', 'phy:/dev/VolGroup00/gateway.swap,xvdb2,w', ]

vif = [ 'mac=00:16:3e:a8:3c:fe, bridge=xenbr0', ]

on_crash    = 'destroy'
vnc=1
vncunused=0
--- snap ---

The system is registered against webqa. If I try to run an update or create 
any other heavy disk/net IO, the system looses the disk:
[root@t60p-jschrode ~]# yum update
[...]
irq21: nobody cared
[...]
Disabling IRQ #21

Now the system disk is not accessible anymore, journal cannot be committed.
I attach a screenshot with the complete message.


Version-Release number of selected component (if applicable):


How reproducible:
Always


Steps to Reproduce:
1. Start a XEN guest with a dedicated PCI (network) device on a T60p
2. run "yum update" or produce heavy net/disk IO


Actual Results:
IRQ ist lost, SATA disk not accessible anymore, working with the system not 
possible anymore

Expected Results:
./.

Additional info: