linux-kernel - Re: [PATCH net] vhost_net: add missing lock nesting notation

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Message-Id: <20180326.125933.76259382836188471.davem@davemloft.net>
Date:   Mon, 26 Mar 2018 12:59:33 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] vhost_net: add missing lock nesting notation

From: Jason Wang <jasowang@...hat.com>
Date: Mon, 26 Mar 2018 16:10:23 +0800

> We try to hold TX virtqueue mutex in vhost_net_rx_peek_head_len()
> after RX virtqueue mutex is held in handle_rx(). This requires an
> appropriate lock nesting notation to calm down deadlock detector.
> 
> Fixes: 0308813724606 ("vhost_net: basic polling support")
> Reported-by: syzbot+7f073540b1384a614e09@...kaller.appspotmail.com
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied and queued up for -stable, thanks Jason.