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Re: kern/45305: umount says device busy without any process having current directory in the mount or file open
The following reply was made to PR kern/45305; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
Subject: Re: kern/45305: umount says device busy without any process having
current directory in the mount or file open
Date: Thu, 29 Sep 2011 00:29:43 +0000
On Tue, Sep 27, 2011 at 02:10:06PM +0000, Matthias Kretschmer wrote:
> Are there any counters of open/etc. files for a mount-point? Am I able
> to output these somehow? As there is no record of anything accessing
> the corresponding mount-points I'm wondering why the systems thinks it
> is busy.
The usual cause of this problem is refcount leaks on vnodes, which are
a royal pain to track down. Figuring out a sequence of actions that
causes it makes it much easier, as it allows restricting the search to
a particular code path.
I've been thinking about writing vnode refdebug code (similar in
concept to LOCKDEBUG) but it's not entirely trivial...
David A. Holland
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