netdev - Re: NULL pointer dereferences with 4.14.27

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Date:   Mon, 19 Mar 2018 16:57:48 +0100
From:   Holger Hoffstätte <holger@...lied-asynchrony.com>
To:     Carlos Carvalho <carlos@...ica.ufpr.br>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg KH <gregkh@...uxfoundation.org>, netdev@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: NULL pointer dereferences with 4.14.27


(CC: davem, soheil & gregkh)

On 03/17/18 20:12, Holger Hoffstätte wrote:
> On 03/17/18 19:41, Carlos Carvalho wrote:
>> I've put 4.14.27 this morning in this machine and in about 2h it started
>> showing null dereferences identical to the following one. There were several of
>> them, with about 1/2h of interval. Strangely it continued to work and I saw no
>> other anomalies. I've just reverted to 4.14.26.
>>
>> It only happened in this machine, which has a net traffic of several Gb/s and
>> thousands of simultaneous connections.
>>
>> Mar 17 13:29:21 sagres kernel: : BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
>> Mar 17 13:29:21 sagres kernel: : IP: tcp_push+0x4e/0xe7
>> Mar 17 13:29:21 sagres kernel: : PGD 0 P4D 0 
>> Mar 17 13:29:21 sagres kernel: : Oops: 0002 [#1] SMP PTI
>> Mar 17 13:29:21 sagres kernel: : CPU: 55 PID: 2658 Comm: apache2 Not tainted 4.14.27 #4
(snip)
> 
> Fixed by: https://www.spinics.net/lists/netdev/msg489445.html
> 
> -h
> 

This patch is in the netdev patchwork at https://patchwork.ozlabs.org/patch/886324/
but has been marked as "not applicable" without further queued/rejected comment
from Dave, so I believe it became a victim of email lossage.
As the patch says it doesn't apply to anything older than 4.14, but it has been
tested & reported by several people as fixing the problem, and indeed works
fine. Since GregKH only accepts net patches from Dave I wanted to make sure
it got queued up for 4.14.

Thanks,
Holger