port-xen/42903 update

[Dima Veselov <i%kab00m.ru@localhost>]

Hi!

I've made some investigation on the problem of immediate panic on writing to 
msdos partition.

First, NetBSD-5.0.1/amd64 is also vulnerable, so I beleive it's a bug in msdos 
driver, not in parts, connected to xen.

Also, I've got something on console at the moment:

kernel: page fault trap, code=0
Stopped in pid 18463.1 (cp) at netbsd:updatefats + 0x1aa : testl %eax,0 (%rsi, 
%rdx, 4)
updatefats() at netbsd: updatefats+0x1aa
chainalloc() at netbsd: chainalloc+0x17a
clusteralloc() at netbsd: clusteralloc+0x218
extendfile() at netbsd: extendfile+0xc4
msdosfs_write() at netbsd: msdosfs_write+0x300
VOP_WRITE() at netbsd: VOP_WRITE+0x2d
vn_write() at netbsd: vn_write+0xce
dofilewrite() at netbsd: dofilewrite+0x7f
sys_write() at netbsd: sys_write+0x72
syscall() at netbsd: syscall+0xb4

-- 
Sincerelly yours