DomainU crashing - Zombie

Hello all:
  After doing some recent updates I've noticed that one previously stable 
domain is
now crashing regularly.  The dom0 is running 2.6.17-1.2187_FC5xen0 and the
corresponding domU kernel on the virtuals.  Dom0 hardware is an Athlon XP 2200
with 1G RAM. This occurs under moderately heavy network. The crashed domain is a
fileserver image with a physical disk and was serving up a Solaris installation
iso when it died.

The DomU will not shutdown with "xm shutdown" or "xm destroy" and I need to 
kill -9
the "xend start" processes to force it down. This also prevents the Dom0 from
rebooting.

Ahh... And just noticed that I can't "xm shutdown" two running VMs either. They 
both
go to Zombie state.

(domain
    (domid 4)
    (uuid 314e3d58-a8b9-a7d6-4d86-472aa42cbcc5)
    (vcpus 1)
    (cpu_weight 1.0)
    (memory 256)
    (maxmem 256)
    (bootloader /usr/bin/pygrub)
    (features )
    (name Zombie-xm-fc5-001)
    (on_poweroff destroy)
    (on_reboot restart)
    (on_crash restart)
    (image
        (linux
            (ramdisk /var/lib/xen/initrd.huJonl)
            (kernel /var/lib/xen/vmlinuz.cTMDsO)
            (args 'ro root=/dev/rootvg/root_lv')
        )
    )
    (state ----cd)
    (shutdown_reason crash)
    (cpu_time 59.409401921)
    (online_vcpus 1)
    (up_time 11961.170969)
    (start_time 1158775219.69)
    (store_mfn 235518)
    (console_mfn 235517)
)


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