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

From: Konrad Schroder <perseant@netbsd.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: PR/26043 CVS commit: src/sys/ufs
Date: Wed, 23 Mar 2005 00:12:51 +0000 (UTC)

 Module Name:	src
 Committed By:	perseant
 Date:		Wed Mar 23 00:12:51 UTC 2005
 
 Modified Files:
 	src/sys/ufs/lfs: lfs_alloc.c lfs_vnops.c
 	src/sys/ufs/ufs: ufs_vnops.c
 
 Log Message:
 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 -r1.77 src/sys/ufs/lfs/lfs_alloc.c
 cvs rdiff -r1.137 -r1.138 src/sys/ufs/lfs/lfs_vnops.c
 cvs rdiff -r1.126 -r1.127 src/sys/ufs/ufs/ufs_vnops.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.