-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 FreeBSD-EN-05:04.nfs Errata Notice The FreeBSD Project Topic: NFS Client may panic when encounted errors Category: core Module: nfsclient Announced: 2005-12-19 Credits: Mohan Srinivasan, Xin LI Affects: FreeBSD 6.0-RELEASE Corrected: 2005-12-19 10:58:58 UTC I. Background The Network File System (NFS) allows a system to share directories and files with others over a network. By using this, users and programs can access files on remote systems almost as if they were local files. II. Problem Description Due to a locking issue in nfs_lookup() a call to vrele() might be made while holding the vnode mutex, which results in kernel panic when doing VFS operations under certain load patterns. III. Impact NFS clients that encountered the load pattern would crash and reboot. IV. Solution Do one of the following to update the source tree: 1) Upgrade your affected system to the RELENG_6_0 errata branch dated after the correction date using cvsup(1) or cvs(1). This is the preferred method. 2) Obtain the updated files using the cvsweb interface. Cvsweb is a Web interface to the CVS repository. The URL to the general interface is "http://cvsweb.freebsd.org/". You can obtain any of the source files for the RELENG_6_0 branch by going to the src directory ("http://cvsweb.freebsd.org/src") and then selecting the "RELENG_6_0" branch tag. With the branch tag set navigate to the files listed below in the "Correction details" section and download them, making sure you get the correct revision numbers. Copy the downloaded files into your /usr/src tree. If using the second procedure you should make sure you have used that same procedure to download all previous Errata Notices and Security Advisories. We strongly discourage this procedure due to the problems that may be caused by not doing that - using the first procedure takes care of making sure all updates get applied. Then follow the normal procedures for rebuilding/reinstalling the kernel. Details about rebuilding/reinstalling are available here: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html V. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. - --------------------------------------------------------------------------- RELENG_6_0 Revision Changes Path 1.416.2.3.2.6 +5 -0 src/UPDATING 1.69.2.8.2.2 +1 -1 src/sys/conf/newvers.sh 1.258.4.1 +1 -1 src/sys/nfsclient/nfs_vnops.c - --------------------------------------------------------------------------- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDujwhFdaIBMps37IRAiPOAKCC9BmZhzFEBm6/kzKMDpZVXk7X/QCfTmsY kHH+tM9KBV1Vau80d0G3vk4= =UvNX -----END PGP SIGNATURE-----