port-i386/41705: fatal supervisor mode trap after continuing from breakpoint in DDB

[bad%bsd.de@localhost]

>Number:         41705
>Category:       port-i386
>Synopsis:       after continuing from a breakpoint in DDB the system receives 
>a fatal supervisor mode trap
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 12 14:50:01 +0000 2009
>Originator:     Christoph Badura
>Release:        NetBSD 5.0_STABLE as of 2009-07-02
>Organization:
netbsd bozotic software test labs
        
>Environment:
        
        
System: NetBSD sanctioned-parts-list 5.0_STABLE NetBSD 5.0_STABLE (GENERIC) #0: 
Thu Jul 2 18:47:45 UTC 2009 
root@arbitrary:/m/obj/m/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
        
Boot a GENERIC kernel into DDB. Set breakpoint on e.g. cgdattach.
Continue. Continue from the break point.  We'll get:

fatal trap in supervisor mode
trap type 5 code 0 eip c042a5e1 cs 8 eflags 302 cr2 0 ilevel 0

and the system is unresponsive and needs a hardware reset.
>How-To-Repeat:
        

boot -d
br cgdattach
c
c

>Fix:
        
Unknown.

>Unformatted: