linux-kernel - Re: [V9fs-developer] 9pfs hangs since 4.7

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Message-ID: <20170107181523.GK1555@ZenIV.linux.org.uk>
Date:   Sat, 7 Jan 2017 18:15:23 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Greg Kurz <groug@...d.org>
Cc:     Tuomas Tynkkynen <tuomas@...era.com>,
        linux-fsdevel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [V9fs-developer] 9pfs hangs since 4.7

On Sat, Jan 07, 2017 at 05:19:10PM +0000, Al Viro wrote:

> released) simply trigger virtio_queue_notify_vq() again?  It *is* a bug
> (if we get a burst filling a previously empty queue all at once, there won't
> be any slots becoming freed

Umm...  Nope, even in that scenario we'll have all requests except the last
one processed.  I'm trying to put together a simpler reproducer, but...
no luck so far.