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Date:      Mon, 05 Nov 2001 08:15:00 +0100
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Mark Santcroos <marks@ripe.net>, current@FreeBSD.ORG
Subject:   Re: patch #2 (was Re: buf_daemon() lockup) 
Message-ID:  <33260.1004944500@critter.freebsd.dk>
In-Reply-To: Your message of "Sun, 04 Nov 2001 17:12:39 PST." <200111050112.fA51Cdc42844@apollo.backplane.com> 

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In message <200111050112.fA51Cdc42844@apollo.backplane.com>, Matthew Dillon wri
tes:
>
>:
>:    Hmm..  that last patch didn't do it.  I've noticed some errors on the
>:    console before the lockup:
>:
>:unexpected md driver lock: 0xe1813900: type VREG, usecount 2, writecount 1, refcount 3871, flags (VOBJBUF)
>:        tag VT_UFS, ino 4, on dev da0s1h (13, 131079) lock type inode: EXCL (count 1) by pid 6
>
>    Ok.  I think these unexpected md driver lock messages are bogus... I'll
>    leave it to Poul to remove it.  The syncer or buf_daemon can be flushing
>    buffers associated with the underlying file simultaniously with other
>    processes doing MD ops.

I actually just copied that part from your vn(4) driver, so by all means
feel free to do what needs done to it.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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