NetBSD, XEN2_DOMU, USER_LDT, Wine, Panic

[Kernel Panic <cinap_lenrek%gmx.de@localhost>]

Hello,

Try to get WINE from pkgsrc running in a XEN2/NetBSD DOMU.
I have no real understanding how XEN internally works.
Maybe its tecnical impossible what WINE is trying todo here under XEN :-/.

Enabling the following option...:

options         USER_LDT        # user-settable LDT; used by WINE

...causes the NetBSD DOMU to panic:

panic: gdt_get_slot botch 1
Stopped in pid 562.1 (wine) at  netbsd:cpu_Debugger+0x4:        popl    %ebp
cpu_Debugger(c03fd737,cb6b7e98,0,1,232) at netbsd:cpu_Debugger+0x4
panic(c03fd5d3,2,0,801727,2000) at netbsd:panic+0x135
gdt_get_slot1(1,0,cb6b7f1c,c038bd6d,ca8697b8) at netbsd:gdt_get_slot1+0xe4
ldt_alloc(ca8697b8,cb560000,2000,89d9,1) at netbsd:ldt_alloc+0x18
i386_set_ldt(cb5a0298,bfbfe250,cb6b7f5c,1,cb5a0298) at 
netbsd:i386_set_ldt+0x24d

sys_sysarch(cb5a0298,cb6b7f64,cb6b7f5c,cb53c804,3) at 
netbsd:sys_sysarch+0x5d
syscall_plain() at netbsd:syscall_plain+0x19b
--- syscall (number 165) ---
0xbda23f03:
ds          0x11
es          0x11
fs          0x31
gs          0x11
edi         0xc03fd5d3  copyright+0x10d13
esi         0x100
ebp         0xcb6b7e5c
ebx         0xcb6b7e98
edx         0
ecx         0xfffffffe
eax         0x1
eip         0xc037baf4  cpu_Debugger+0x4
cs          0x9
eflags      0x202
esp         0xcb6b7e5c
ss          0x11
netbsd:cpu_Debugger+0x4:        popl    %ebp
Stopped in pid 562.1 (wine) at  netbsd:cpu_Debugger+0x4:        popl    %ebp

Here seems to be a good reason this option was commented out right? ;-)
Can someone explain this to me?