Date: Fri, 09 Jan 2004 20:37:08 +1100 From: Tim Robbins <tjr@freebsd.org> To: Florian Weimer <fw@deneb.enyo.de> Cc: freebsd-fs@freebsd.org Subject: Re: nullfs on 5.1 Message-ID: <3FFE7644.2020402@freebsd.org> In-Reply-To: <20040108220703.GA19764@deneb.enyo.de> References: <20040108220703.GA19764@deneb.enyo.de>
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Florian Weimer wrote: >I'm trying to use nullfs on FreeBSD 5.1, and run into deadlocks in quite >simple situations (chroot to tree that contains an alias mount, read >access to the mounted tree -- no recursive/loop mounts). Processes get >stuck and hang forever in D state (holding a UFS log according to ps). > > One major potential deadlock has been fixed since the release of 5.1. If you find a reproducible way of deadlocking nullfs on 5.2 or a -current snapshot less than 6 months old, submit a bug report. >Is nullfs essentially unsuported, or is it just broken? What's the >status of unionfs (the manpage is rather discouraging). > > > Nullfs is unsupported, but works well except for a few outstanding bugs (e.g. accessing some kinds of special files on the lower layer through the upper layer causes a panic). Similarly for unionfs. Umapfs is broken and should be avoided. Tim
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