kern/38432: memcpy freezes with files mmap'ed from smbfs

[sitlar%gmail.com@localhost]

>Number:         38432
>Category:       kern
>Synopsis:       memcpy freezes with  files  mmap'ed from smbfs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 15 08:00:01 +0000 2008
>Originator:     Ilya Cohn
>Release:        NetBSD 4.0
>Organization:
IREE
>Environment:
NetBSD .home 4.0 NetBSD 4.0 (GENERIC_LAPTOP) #0: Sun Dec 16 00:27:57 PST 2007  
builds@wb34:/home/builds/ab/netbsd-4-0-RELEASE/i386/200712160005Z-obj/home/builds/ab/netbsd-4-0-RELEASE/src/sys/arch/i386/compile/GENERIC_LAPTOP
 i386
>Description:
A program freezes trying to do a memcpy to a memory object, created by mmap of 
a file, located on a mounted smb share.
>How-To-Repeat:
Try to memcpy to a mmaped file. It'll be OK on ffs but fail on smbfs.
>Fix: