kern/132404: panic sleeping thread after 25th Feb src/sys/net commits

[Ruben van Staveren]

>Number:         132404
>Category:       kern
>Synopsis:       panic sleeping thread after 25th Feb src/sys/net commits
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Mar 08 10:50:04 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Ruben van Staveren
>Release:        FreeBSD 7.1-STABLE i386
>Organization:
>Environment:
System: FreeBSD helium.verweg.com 7.1-STABLE FreeBSD 7.1-STABLE #55: Sat Mar 7 20:49:56 CET 2009 root at helium.verweg.com:/usr/obj/usr/cvsup/7-stable/src/sys/HELIUM-SMP i386


	
>Description:

cvsupping to feb 25th makes the system panic during early boot, somewhere
around the time when /etc/rc.d/ppp and /etc/rc.d/routing is started. After
enabling witness it will panic with a witness_warn

Maybe some of it is related to kern/129846


>How-To-Repeat:

This happens while using IPv6, pf, ppp (during boot to connect ADSL) using the following versions

     $FreeBSD: src/sys/net/route.c,v 1.120.2.9 2009/02/25 11:18:18 rwatson Exp $
     $FreeBSD: src/sys/net/rtsock.c,v 1.143.2.8 2009/02/25 10:59:56 rwatson Exp $
     $FreeBSD: src/sys/net/route.h,v 1.65.2.5 2009/02/25 10:59:56 rwatson Exp $
     $FreeBSD: src/sys/netinet6/in6_rmx.c,v 1.18.2.4 2009/02/25 10:59:56 rwatson Exp $
     $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.39.2.4 2009/02/25 10:59:56 rwatson Exp $
     $FreeBSD: src/sys/netinet/in_rmx.c,v 1.57.2.3 2009/02/25 10:59:56 rwatson Exp $

The following textdumps are available:

Without WITNESS enabled (so empty show locks/alllocks)

1. http://ruben.is.verweg.com/stuff/freebsd/panic-sleepable-thread-textdump.tar.301

After enabling WITNESS and WITNESS_KDB

2. http://ruben.is.verweg.com/stuff/freebsd/witness_checkorder-textdump.tar.302

After setting debug.witness.kdb=0, to get the actual panic again

3. http://ruben.is.verweg.com/stuff/freebsd/panic-witness_warn-textdump.tar.303


>Fix:

Backing out those changes prevents the system from panicing

These revisions are safe

     $FreeBSD: src/sys/net/route.c,v 1.120.2.7 2008/11/06 22:11:57 julian Exp $
     $FreeBSD: src/sys/net/rtsock.c,v 1.143.2.7 2009/02/18 20:12:08 jamie Exp $
     $FreeBSD: src/sys/net/route.h,v 1.65.2.4 2008/11/06 22:11:57 julian Exp $
     $FreeBSD: src/sys/netinet6/in6_rmx.c,v 1.18.2.3 2008/09/01 19:23:04 obrien Exp $
     $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.39.2.3 2008/09/01 19:23:04 obrien Exp $
     $FreeBSD: src/sys/netinet/in_rmx.c,v 1.57.2.2 2008/11/06 22:11:57 julian Exp $
>Release-Note:
>Audit-Trail:
>Unformatted: