port-amd64/46328: Switching into and out of promiscuous mode causes lockup

[john%ziaspace.com@localhost]

>Number:         46328
>Category:       port-amd64
>Synopsis:       Switching an
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 13 06:45:00 +0000 2012
>Originator:     John Klos
>Release:        NetBSD 6.0_BETA (from 13-April-2012 checkout)
>Organization:
        
>Environment:
        
        
System: NetBSD test.ziaspace.com 6.0_BETA NetBSD 6.0_BETA (GENERIC) #0: Thu Apr 
12 20:17:08 PDT 2012 
john%test.ziaspace.com@localhost:/usr/obj/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
        
simh uses promiscuous mode. Launching and quitting simh several times will 
cause a lockup from which I cannot get into the debugger. Disabling access 
to the network interface allows me to launch and quit simh as many times 
as I like without problems. This happens on different network interfaces. 
Tried with motherboard re* and USB-ethernet aue*.
>How-To-Repeat:
        
Switch ethernet interface into and out of promiscuous mode.
>Fix:
        

>Unformatted:
 interface into and out of promiscuous mode locks up amd64 netbsd-6 system.