linux-kernel - Re: possible deadlock in cma_netdev

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Message-ID: <20200227155335.GI31668@ziepe.ca>
Date:   Thu, 27 Feb 2020 11:53:35 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Bernard Metzler <BMT@...ich.ibm.com>
Cc:     syzbot <syzbot+55de90ab5f44172b0c90@...kaller.appspotmail.com>,
        chuck.lever@...cle.com, dledford@...hat.com, leon@...nel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, parav@...lanox.com,
        syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: possible deadlock in cma_netdev_callback

On Thu, Feb 27, 2020 at 10:11:13AM +0000, Bernard Metzler wrote:

> Thanks for letting me know! Hmm, we cannot use RCU locks since
> we potentially sleep. One solution would be to create a list
> of matching interfaces while under lock, unlock and use that
> list for calling siw_listen_address() (which may sleep),
> right...?

Why do you need to iterate over addresses anyhow? Shouldn't the listen
just be done with the address the user gave and a BIND DEVICE to the
device siw is connected to?

Also that loop in siw_create looks wrong to me

Jason