Date: Sun, 5 Apr 2009 12:15:04 +0100 (BST) From: "Mark Powell" <M.S.Powell@salford.ac.uk> To: Stefan Bethke <stb@lassitu.de> Cc: freebsd-current@freebsd.org Subject: Re: panic: vput: negative ref cnt Message-ID: <20090405120658.A24261@rust.salford.ac.uk> In-Reply-To: <190B8595-BAF8-41F5-B63F-64604672BFD3@lassitu.de> References: <20090404124909.C24261@rust.salford.ac.uk> <190B8595-BAF8-41F5-B63F-64604672BFD3@lassitu.de>
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On Sun, 5 Apr 2009, Stefan Bethke wrote: Stefan, Thanks for the input. > Am 04.04.2009 um 13:55 schrieb Mark Powell: >> My script takes a zfs snapshot, mounts the snapshot, backs it up using >> star, then umounts the snapshot. The panic seems to occur on the umount. > > This is a different panic from the one I was getting, but appears to occur > under the same circumstances. > > I managed to avoid the panic by keeping the snapshot until the next run of my > backup script, and not unmounting anything. Yeah, I got around it by avoiding the unmount. My script dates from 7-STABLE days, where a zfs bug caused the automounted snapdir e.g. .zfs/snapshot/star_L0_2009-04-04-16:57, to be missing a '..' entry. That prevented star from detecting that I was performing a true full backup. Thus my script directly mounted the snapshot to get a proper fs with a '..' entry and unmounted it when finished. Now the included version of zfs in 8-CURRENT doesn't have that bug any longer. So I've reverted to backing up the automounted snapdir. Consequently as I don't perform a mount I don't have to unmount either, effectively working around the bug. > See > <http://lists.freebsd.org/pipermail/freebsd-current/2009-February/003513.html>; Do you know if a PR has been submitted for this one? Cheers. -- Mark Powell - UNIX System Administrator - The University of Salford Information & Learning Services, Clifford Whitworth Building, Salford University, Manchester, M5 4WT, UK. Tel: +44 161 295 6843 Fax: +44 161 295 5888 www.pgp.com for PGP key
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