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Date:      Sat, 30 Nov 2002 19:56:42 +0100 (CET)
From:      Michal Mertl <mime@traveller.cz>
To:        current@freebsd.org
Subject:   Re: system locks with vnode backed md(4)
Message-ID:  <Pine.BSF.4.41.0211301949200.88595-200000@prg.traveller.cz>

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--0-1318642693-1038682138=:88595
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine.BSF.4.41.0211301949202.88595@prg.traveller.cz>

Ok, I got another one. DDB output attached. I did all kinds of operations
to trigger it - had 3 md mounted from the same dir, in 2 of them doing my
ports.tgz torture test and in root file system I had 'find . -inum
1231231' running.  One find finished succesfully but then it finally
locked-up.

> Yeah, vnode locks and other lockmgr locks don't show up in 'show locks',
> since only SMPng locking primitives are tracked by WITNESS.
I see.

> There are a fair number of vnode locking deadlock scenarios that are
> unavoidable where we rely on grabbing vnode locks out of the directory
> structure lock order.  This occurs for vnode-backed md devices, quotas,
> and UFS1 extended attributes, and probably some other situations.  I
> suspect that Terry is correct that operations on the vnode backing file
> storage directory are triggering the problem, since that increases the
> chances that a vnode lock "race to root" will occur from both the file
> system backed into the md device, and for the md backing vnodes during
> blocking I/O.  If you can avoid directory operations on the md backing
> directory, that would probably be one way to avoid triggering the bug.

I'm afraid this doesn't sound too good for me.

> Seeing it reproduced would probably confirm that this is the case.  On the
> other hand, there may be other deadlocks in the vnode/ufs/md code that can
> be more easily corrected than this general VFS problem, so details there
> would be very useful.

May be the attached one will allow someone to track something down.

PS: Sorry if you have problems with attachment, I myself find them
difficult to read (I'm receivind digest of this list - isn't there a
possibility to have it in mime form (like Buqtraq and others)?

-- 
Michal Mertl
mime@traveller.cz


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--0-1318642693-1038682138=:88595--

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