netdev - Re: netconsole deadlock with virtnet

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Message-ID: <20201123105252.1c295138@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 23 Nov 2020 10:52:52 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Jason Wang <jasowang@...hat.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>,
        virtualization@...ts.linux-foundation.org,
        Amit Shah <amit@...nel.org>, Itay Aveksis <itayav@...dia.com>,
        Ran Rozenstein <ranro@...dia.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: netconsole deadlock with virtnet

On Mon, 23 Nov 2020 09:31:28 -0500 Steven Rostedt wrote:
> On Mon, 23 Nov 2020 13:08:55 +0200
> Leon Romanovsky <leon@...nel.org> wrote:
> 
> 
> >  [   10.028024] Chain exists of:
> >  [   10.028025]   console_owner --> target_list_lock --> _xmit_ETHER#2  
> 
> Note, the problem is that we have a location that grabs the xmit_lock while
> holding target_list_lock (and possibly console_owner).

Well, it try_locks the xmit_lock. Does lockdep understand try-locks?

(not that I condone the shenanigans that are going on here)