I have installed FreeBSD 8.1-STABLE paravirtualized Xen DomU according to the 
documentation at:

RELENG_8 CVS tag was used to get world and kernel sources.

The kernel get into panic while booting:
panic: HYPERVISOR_update_va_mapping(((unsigned long)(va)), (pa | 0x002 | 0x001 
| pgeflag | pmap_cache_bits(mode, 0)), UVMF_INVLPG| UVMF_ALL) < 0: 
cpuid = 0
KDB: enter: panic
[thread pid 0 tid 0 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why

db> where
Tracing pid 0 tid 0 td 0xc03e0af0
kdb_enter(c036c678,c036c678,c0390af5,c051ecb4,0,...) at kdb_enter+0x3a
panic(c0390af5,c0398fbf,c0398cd1,4f5,0,...) at panic+0x134
pmap_mapdev_attr(0,0,500,6,c051ed44,...) at pmap_mapdev_attr+0x13d
pmap_mapbios(0,0,500,1,c051ed44,...) at pmap_mapbios+0x27
x86bios_call(c22ca3c0,0,0,76,c051ed64,...) at x86bios_call+0x212
module_register_init(c03db8f0,7020800,7020800,523000,0,...) at 
mi_startup(523000,0,0,0,0,...) at mi_startup+0x96
btext() at btext+0x95

DomU details
FreeBSD 8.1-STABLE #8
kernel config: /usr/src/sys/XEN i386
xen config:
kernel = "/var/lib/xen/images/kernel.6jZmCCXlzjBa"
memory = "512"
name = "6jZmCCXlzjBa"
vcpus = "1"
vid = "17"
sanip = ""

vif = [ 'mac=00:16:3e:0a:e2:40, bridge=xenbr0, ip=, 
vifname=6jZmCCXlzjBa, rate=0Mb/s' ]
disk = [ 'phy:/dev/iscsi_0_17,sda,w', 'phy:/dev/iscsi_0_137,sdb,w' ]

extra = "boot_verbose=1"
extra += ",vfs.root.mountfrom=ufs:/dev/da0"
extra += ",kern.hz=100"

Dom0 details
CentOS release 5.4 (Final)
Linux vl-radar-box1.slc.westdc.net 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3 
16:48:13 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

DomU built from RELENG_8_0 booted fine for me. But it is very unstable. Kernel 
panics every time DomU is more higher loaded with network, CPU or memory. I 
reported several BRs for them, but with no result for the moment.

Could somebody please assist with the panic ?


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