port-xen/42903: writing to msdos fs cause NetBSD restart immediately

[kab00m%lich.phys.spbu.ru@localhost]

        Note: There was a bad value `seriuos' for the field `Severity'.
        It was set to the default value of `serious'.

>Number:         42903
>Category:       port-xen
>Synopsis:       writing to msdos fs cause NetBSD restart immediately
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 28 18:00:01 +0000 2010
>Originator:     Dima Veselov
>Release:        NetBSD 5.0_STABLE
>Organization:
>Environment:
System: NetBSD laura 5.0_STABLE NetBSD 5.0_STABLE (Ultra) #0: ÓÂ ÓÅÎ 5 21:20:00 
MSD 2009 root@laura:/usr/src/sys/arch/amd64/compile/Ultra amd64
Architecture: x86_64
Machine: amd64
>Description:
        Writing to mounted msdos filesystem (flash, phone, floppy or vnd) cause 
NetBSD to restart. Sometimes I managed to do some writes of small files. Today 
i just tried to delete some files from my phone and system restarted. Maybe not 
only port-xen specific.
>How-To-Repeat:
        Mount ms-dos filesystem, write a file more than 100Kb on it.
>Fix:
        Wish to know, but don't.

>Unformatted:
 My stable is 5 Sep 2009. But this was noticed on any others i had - 5.0, 
5.0.1, several currents. If I correctly remember this began somewhere nearby 
branching NetBSD 5.