netdev - Re: rtnl_lock deadlock with tg3 driver

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Date:   Mon, 31 Aug 2020 12:20:32 -0700
From:   Baptiste Covolato <baptiste@...sta.com>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     David Christensen <drc@...ux.vnet.ibm.com>,
        Michael Chan <mchan@...adcom.com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Netdev <netdev@...r.kernel.org>, Daniel Stodden <dns@...sta.com>
Subject: Re: rtnl_lock deadlock with tg3 driver

On Sun, Aug 30, 2020 at 9:58 PM Michael Chan <michael.chan@...adcom.com> wrote:
>
> On Fri, Aug 28, 2020 at 5:40 PM Baptiste Covolato <baptiste@...sta.com> wrote:
> >
> > Hi David, Michael,
> >
> > I am contacting you because I'm experiencing an issue that seems to be
> > awfully close to what David attempted to fix related to the tg3 driver
> > infinite sleep while holding rtnl_lock
> > (https://lkml.org/lkml/2020/6/15/1122).
>
> David's remaining issue was tg3_reset_task() returning failure due to
> some hardware error.  This would leave the driver in a limbo state
> with netif_running() still true, but NAPI not enabled.  This can
> easily lead to a soft lockup with rtnl held when it tries to disable
> NAPI again.
>
> I think the proper fix is to close the device when tg3_reset_task()
> fails to bring it to a consistent state.  I haven't heard back from
> David in a while, so I will propose a patch to do this in the next
> day.
>
> Let's see if this patch will also work for you.  Thanks.


Thanks Michael. Looking forward to trying this patch out.

-- 
Baptiste Covolato