The following reply was made to PR kern/26043; it has been noted by GNATS.

From: Matthias Scheler <tron@netbsd.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: PR/26043 CVS commit: [netbsd-3] src/sys/ufs/lfs
Date: Wed, 30 Mar 2005 10:12:11 +0000 (UTC)

 Module Name:	src
 Committed By:	tron
 Date:		Wed Mar 30 10:12:11 UTC 2005
 
 Modified Files:
 	src/sys/ufs/lfs [netbsd-3]: lfs_alloc.c
 
 Log Message:
 Pull up revision 1.77 (requested by perseant in ticket #74):
 Make LFS dirops get their vnode first, before incrementing the dirop
 count, to prevent a deadlock trying to call VOP_PUTPAGES() on a VDIROP
 vnode. This can happen when a stacked filesystem is mounted on top of an
 LFS: an LFS dirop needs to get a vnode, which is available from the upper
 layer. The corresponding lower layer vnode, however, is VDIROP, so the
 upper layer can't be cleaned out since its VOP_PUTPAGES() is passed
 through to the lower layer, which waits for dirops to drain before it can
 proceed.  Deadlock.
 Tweak ufs_makeinode() and ufs_mkdir() to pass the a_vpp argument through
 to VOP_VALLOC().
 Partially addresses PR # 26043, though it probably does not completely fix
 the problem described there.
 
 
 To generate a diff of this commit:
 cvs rdiff -r1.76 -r1.76.2.1 src/sys/ufs/lfs/lfs_alloc.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.