Re: kern/38956: rb tree corruption?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR kern/38956; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%NetBSD.org@localhost, gnats-admin%NetBSD.org@localhost, 
netbsd-bugs%NetBSD.org@localhost
Subject: Re: kern/38956: rb tree corruption?
Date: Mon, 16 Jun 2008 13:47:06 +0200

 On Sun, Jun 15, 2008 at 12:40:00PM +0000, martin%duskware.de@localhost wrote:
 > >Number:         38956
 > >Category:       kern
 > >Synopsis:       rb tree corruption?
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    kern-bug-people
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Sun Jun 15 12:40:00 +0000 2008
 > >Originator:     Martin Husemann
 > >Release:        NetBSD 4.99.64
 > >Organization:
 > The NetBSD Foundation, Inc.
 > >Environment:
 > System: NetBSD night-porter.duskware.de 4.99.64 NetBSD 4.99.64 (PORTER) #51: 
 > Sat Jun 14 21:13:47 CEST 2008 
 > martin%night-porter.duskware.de@localhost:/usr/src/sys/arch/i386/compile/PORTER
 >  i386
 > Architecture: i386
 > Machine: i386
 > >Description:
 > 
 > Suddenly happened after ~1 day uptime on a SMP machine. It is used as a NFS
 > server and a client just had done a "make cleandir" on a part of the source
 > tree.
 > 
 > (manually transcribed)
 > 
 > panic: kernel diagnostic assertion "!RB_SENTINEL_P(brother)" failed: file 
 > "../../../../../../lib/libkern/rb.c", line 809
 > 
 > trace:
 > rb_tree_iterate()
 > uvm_pagefree()
 > genfs_do_putpages()
 > genfs_putpages()
 > VOP_PUTPAGES()
 > uvm_vnp_setsize()
 > ffs_truncate()
 > ufs_inactive()
 > VOP_INACTIVE()
 > vrelel()
 > vrele()
 > handle_workitem_remove()
 > softdep_process_worklist()
 > sched_sync()
 
 See also http://mail-index.netbsd.org/current-users/2008/06/11/msg002915.html
 for another pattern which may also be related to RB trees.
 
 -- 
 Manuel Bouyer, LIP6, Universite Paris VI.           
Manuel.Bouyer%lip6.fr@localhost
      NetBSD: 26 ans d'experience feront toujours la difference
 --