linux-kernel - Re: [PATCH] xen/netfront: tolerate frags with no data

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Message-ID: <425ca7b2-de7b-0490-0f10-e64dce1a6e28@suse.com>
Date:   Wed, 19 Dec 2018 07:02:52 +0100
From:   Juergen Gross <jgross@...e.com>
To:     David Miller <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        xen-devel@...ts.xenproject.org, sstabellini@...nel.org,
        boris.ostrovsky@...cle.com, stable@...r.kernel.org
Subject: Re: [PATCH] xen/netfront: tolerate frags with no data

On 19/12/2018 07:00, David Miller wrote:
> From: Juergen Gross <jgross@...e.com>
> Date: Tue, 18 Dec 2018 16:06:19 +0100
> 
>> At least old Xen net backends seem to send frags with no real data
>> sometimes. In case such a fragment happens to occur with the frag limit
>> already reached the frontend will BUG currently even if this situation
>> is easily recoverable.
>>
>> Modify the BUG_ON() condition accordingly.
>>
>> Tested-by: Dietmar Hahn <dietmar.hahn@...fujitsu.com>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> Applied and queued up for -stable.
> 
> But many of these BUG's in the driver should be converted to
> WARNs and recovery code added.
> 

Right, but that will be no stable material then. Will start that effort
after Christmas.


Juergen