Re: kern/46221: Kernel panic in NFS server code

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

The following reply was made to PR kern/46221; it has been noted by GNATS.

From: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/46221: Kernel panic in NFS server code
Date: Fri, 23 Mar 2012 10:47:36 +0100

 On Mar 23, 2012, at 10:35 AM, Manuel Bouyer wrote:
 
 > So it got a clean vnode. This is bad.
 > I suspect ufs_ihashget() is returnning the clean vnode; otherwise it =
 has to be
 > in ffs_vget() itself.
 
 I would expext ufs_fhtovp -> ffs_vget -> ufs_ihashget -> vget and then =
 the
 window between mutex_exit(vp->v_interlock) and vn_lock(vp, flags).
 
 It is asserted not VI_CLEAN before the mutex_exit() and definitely =
 VI_CLEAN
 after the vn_lock().
 
 See my previous message on changing vn_lock() to return invalid vnodes
 only when the caller requested it by setting LK_RETRY.
 
 --
 Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig =
 (Germany)=