amd64/134757: 32 bit processes on 64 bit platforms occasionally drop core with bad ds reg

[John Baldwin]

The following reply was made to PR amd64/134757; it has been noted by GNATS.

From: John Baldwin <jhb at freebsd.org>
To: freebsd-amd64 at freebsd.org
Cc: Stephen Sanders <ssanders at opnet.com>,
 freebsd-gnats-submit at freebsd.org
Subject: Re: amd64/134757: 32 bit processes on 64 bit platforms occasionally drop core with bad ds reg
Date: Thu, 21 May 2009 12:21:00 -0400

 On Wednesday 20 May 2009 11:52:45 am Stephen Sanders wrote:
 > 
 > >Number:         134757
 > >Category:       amd64
 > >Synopsis:       32 bit processes on 64 bit platforms occasionally drop core 
 with bad  ds reg
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       medium
 > >Responsible:    freebsd-amd64
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Wed May 20 16:00:12 UTC 2009
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Stephen Sanders
 > >Release:        6.3 Release amd64
 > >Organization:
 > OPNET
 > >Environment:
 > FreeBSD alt-4100-2.lab.opnet.com 6.3-RELEASE FreeBSD 6.3-RELEASE #0: Tue Mar 
 31 14:11:07 PDT 2009     
 pmai at focus7.networkphysics.com:/u1/builds/ping/NP/FreeBSD/package/NPbabkernel/bld-tmp/sys/amd64/compile/NPBAB  
 amd64
 > >Description:
 > With fair regularity, we have 32 bit processes dropping core on 64 bit 
 systems.  In particular perl and bash.
 > 
 > Our system is definitely a hybrid but that aspect appears to not be the 
 issue.  The system works properly more than not.
 > 
 > I have attached a file containing 2 gdb sessions. One session is looking at 
 a core that bash left behind and the other is looking at a bash session with 
 no core.
 
 Have you tested this on 7 at all?  At this point most developers are probably 
 much more inclined to fix this for 8.0 and 7.x rather than 6.x.
 
 -- 
 John Baldwin