Re: kern/38956: rb tree corruption?

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

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
--