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Date: Mon, 5 Mar 2012 14:53:53 -0500 (EST)
From: Garrett Wollman <wollman@csail.mit.edu>
Reply-To: Garrett Wollman <wollman@csail.mit.edu>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: geom_multipath page fault on removed drive
X-Send-Pr-Version: 3.113
X-GNATS-Notify:

>Number:         165745
>Category:       kern
>Synopsis:       [geom] geom_multipath page fault on removed drive
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-geom
>State:          feedback
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 05 20:30:09 UTC 2012
>Closed-Date:    
>Last-Modified:  Tue Jun  5 16:10:17 UTC 2012
>Originator:     Garrett Wollman
>Release:        FreeBSD 9.0-RELEASE amd64
>Organization:
MIT Computer Science & Artificial Intelligence Lab
>Environment:
System: FreeBSD zfsnfs.csail.mit.edu 9.0-RELEASE FreeBSD 9.0-RELEASE #3 r232145M: Sun Feb 26 20:00:10 EST 2012 wollman@zfsnfs.csail.mit.edu:/usr/obj/usr/src/sys/ZFSNFS amd64

This machine has a 16-port LSI SAS controller (mps driver, backported
from 9-stable) with 96 external drives.  All of these drives are
labeled for multipath, but only one path is active.

>Description:

In testing, when I pulled a disk from the shelf, the kernel panicked
with a page fault in geom_multipath.  I did not think to get a
screenshot.

>How-To-Repeat:

>Fix:

Unknown.  I'm willing to backport mav@'s rewritten multipath code from
head if there's some reason to believe it will help.

>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-geom 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Mon Mar 12 00:27:44 UTC 2012 
Responsible-Changed-Why:  
Over to maintainer(s). 

http://www.freebsd.org/cgi/query-pr.cgi?pr=165745 

From: Alexander Motin <mav@FreeBSD.org>
To: bug-followup@FreeBSD.org, wollman@csail.mit.edu
Cc:  
Subject: Re: kern/165745: [geom] geom_multipath page fault on removed drive
Date: Tue, 13 Mar 2012 17:37:28 +0200

 New GEOM_MULTIPATH code was merged to 9-STABLE about two months ago. I 
 believe that should fix your problem.
 
 -- 
 Alexander Motin
State-Changed-From-To: open->feedback 
State-Changed-By: gavin 
State-Changed-When: Tue Jun 5 14:02:24 UTC 2012 
State-Changed-Why:  
To submitter: it sounds like this may be fixed - are you still able 
to recreate the problem? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=165745 

From: Garrett Wollman <wollman@csail.mit.edu>
To: gavin@FreeBSD.org
Cc: freebsd-gnats-submit@FreeBSD.org
Subject: Re: kern/165745: [geom] geom_multipath page fault on removed drive
Date: Tue, 5 Jun 2012 12:03:57 -0400

 <<On Tue, 5 Jun 2012 14:05:15 GMT, gavin@FreeBSD.org said:
 
 > To submitter: it sounds like this may be fixed - are you still able
 > to recreate the problem?
 
 I haven't had time to backport the new version to 9.0, nor to actually
 reboot the server we are testing to install a new kernel.  This will
 get done when I need to put the server into production, assuming 9.1
 isn't released by then.
 
 -GAWollman
>Unformatted:
