NetBSD domU crash when starting X server

["Stathis Kamperis" <ekamperi%gmail.com@localhost>]

Hello everyone!

 I am using NetBSD 4.0_STABLE and Xen3. I am also running NetBSD as
 dom0 and domU as well. If I try to startx inside domU, I get this:

 (==) Log file: "/var/log/XFree86.0.log", Time: Mon Apr 21 01:05:07 2008
 (==) Using config file: "/etc/X11/XF86Config".
 panic: HYPERVISOR_mmu_update failed

 Stopped in pid 265.1 (XFree86) at       netbsd:cpu_Debugger+0x4:
  popl    %
 ebp
 db> bt
 cpu_Debugger(c0414e88,c6c12938,bfbfe000,1,c5f89afc) at netbsd:cpu_Debugger+0x4
 panic(c041599e,8000,1,c6c29320,bbbff000) at netbsd:panic+0x155
 xpq_flush_queue(6d1daf8,f8025,0,0,0) at netbsd:xpq_flush_queue+0x55
 pmap_enter_ma(c5f89afc,bbabe000,f8000,f8000,1) at netbsd:pmap_enter_ma+0x485
 pmap_enter(c5f89afc,bbabe000,f8000,1,21) at netbsd:pmap_enter+0x73
 udv_fault(c6c12b90,bbabe000,c6c12b50,1,0) at netbsd:udv_fault+0x144
 uvm_fault_internal(c5f881c0,bbabe000,1,0,27ba18bb) at
netbsd:uvm_fault_internal+
 0x41f
 trap() at netbsd:trap+0x497
 --- trap (number 6) ---
 0xbbb7d089:
 db>

 The crash is 100% reproducible for me.
 Is there any way to provide you with more useful info ?

 Best regards,

Stathis Kamperis