Date:   Thu, 12 Oct 2017 10:54:49 -0600
From:   Shuah Khan <shuahkh@....samsung.com>
To:     Xin Long <lucien.xin@...il.com>,
        Andreas Radke <andreas.radke@...lbox.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        linux@...ck-us.net, patches@...nelci.org,
        ben.hutchings@...ethink.co.uk, stable@...r.kernel.org,
        Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 4.9 000/105] 4.9.55-stable review

On 10/12/2017 09:35 AM, Shuah Khan wrote:
> On 10/12/2017 09:25 AM, Xin Long wrote:
>> On Thu, Oct 12, 2017 at 11:18 PM, Andreas Radke
>> <andreas.radke@...lbox.org> wrote:
>>> Building the 4.9.x kernel package for Arch Linux 4.9.55 gives this IPv4 error here:
>>>
>>> Job for dhcpd4.service failed because the control process exited with error code.
>>> See "systemctl  status dhcpd4.service" and "journalctl  -xe" for details.
>>> root@...ver64:/root # systemctl  status dhcpd4.service
>>> ● dhcpd4.service - IPv4 DHCP server
>>>    Loaded: loaded (/usr/lib/systemd/system/dhcpd4.service; enabled; vendor preset: disabled)
>>>    Active: failed (Result: exit-code) since Thu 2017-10-12 17:09:38 CEST; 8s ago
>>>   Process: 638 ExecStart=/usr/bin/dhcpd -4 -q -user dhcp -cf /etc/dhcpd.conf -pf /run/dhcpd4.pid (code=exited, status=1/FAILURE)
>>>
>>> Okt 12 17:09:38 server64 dhcpd[638]: If you think you have received this message due to a bug rather
>>> Okt 12 17:09:38 server64 dhcpd[638]: than a configuration issue please read the section on submitting
>>> Okt 12 17:09:38 server64 dhcpd[638]: bugs on either our web page at www.isc.org or in the README file
>>> Okt 12 17:09:38 server64 dhcpd[638]: before submitting a bug.  These pages explain the proper
>>> Okt 12 17:09:38 server64 dhcpd[638]: process and the information we find helpful for debugging.
>>> Okt 12 17:09:38 server64 dhcpd[638]:
>>> Okt 12 17:09:38 server64 dhcpd[638]: exiting.
>>> Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Control process exited, code=exited status=1
>>> Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Failed with result 'exit-code'.
>>> Okt 12 17:09:38 server64 systemd[1]: Failed to start IPv4 DHCP server.
>>>
>>> journalctl -xe
>>> Okt 12 17:09:37 server64 systemd[1]: Starting IPv4 DHCP server...
>>> -- Subject: Unit dhcpd4.service has begun start-up
>>> -- Defined-By: systemd
>>> -- Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
>>> --
>>> -- Unit dhcpd4.service has begun starting up.
>>> Okt 12 17:09:38 server64 dhcpd[638]: Internet Systems Consortium DHCP Server 4.3.6
>>> Okt 12 17:09:38 server64 dhcpd[638]: Copyright 2004-2017 Internet Systems Consortium.
>>> Okt 12 17:09:38 server64 dhcpd[638]: All rights reserved.
>>> Okt 12 17:09:38 server64 dhcpd[638]: For info, please visit https://www.isc.org/software/dhcp/
>>> Okt 12 17:09:38 server64 dhcpd[638]: Source compiled to use binary-leases
>>> Okt 12 17:09:38 server64 dhcpd[638]: Wrote 0 deleted host decls to leases file.
>>> Okt 12 17:09:38 server64 dhcpd[638]: Wrote 0 new dynamic host decls to leases file.
>>> Okt 12 17:09:38 server64 dhcpd[638]: Wrote 16 leases to leases file.
>>> Okt 12 17:09:38 server64 dhcpd[638]: Can't install packet filter program: Cannot allocate memory
>>> Okt 12 17:09:38 server64 dhcpd[638]:
>>> Okt 12 17:09:38 server64 dhcpd[638]: If you think you have received this message due to a bug rather
>>> Okt 12 17:09:38 server64 dhcpd[638]: than a configuration issue please read the section on submitting
>>> Okt 12 17:09:38 server64 dhcpd[638]: bugs on either our web page at www.isc.org or in the README file
>>> Okt 12 17:09:38 server64 dhcpd[638]: before submitting a bug.  These pages explain the proper
>>> Okt 12 17:09:38 server64 dhcpd[638]: process and the information we find helpful for debugging.
>>> Okt 12 17:09:38 server64 dhcpd[638]:
>>> Okt 12 17:09:38 server64 dhcpd[638]: exiting.
>>> Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Control process exited, code=exited status=1
>>> Okt 12 17:09:38 server64 systemd[1]: dhcpd4.service: Failed with result 'exit-code'.
>>> Okt 12 17:09:38 server64 systemd[1]: Failed to start IPv4 DHCP server.
>>> -- Subject: Unit dhcpd4.service has failed
>> pls try revert:
>> commit 02f7e4101092b88e57c73171174976c8a72a3eba
> 
> Correction. The commit is:
> 
> 345c66695569db83eed100723e4df72cb54df7de
> 
> I will try the revert and let you know.

okay reverting the

commit 345c66695569db83eed100723e4df72cb54df7de
Author: Eric Dumazet <edumazet@...gle.com>
Date:   Mon Oct 2 12:20:51 2017 -0700

    socket, bpf: fix possible use after free
    
    
    [ Upstream commit eefca20eb20c66b06cf5ed09b49b1a7caaa27b7b ]
    
    Starting from linux-4.4, 3WHS no longer takes the listener lock.
    
    Since this time, we might hit a use-after-free in sk_filter_charge(),
    if the filter we got in the memcpy() of the listener content
    just happened to be replaced by a thread changing listener BPF filter.
    
    To fix this, we need to make sure the filter refcount is not already
    zero before incrementing it again.
    
    Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
    Signed-off-by: Eric Dumazet <edumazet@...gle.com>
    Acked-by: Alexei Starovoitov <ast@...nel.org>
    Acked-by: Daniel Borkmann <daniel@...earbox.net>
    Signed-off-by: David S. Miller <davem@...emloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

fixes the issue. Looks like this is a fix for another problem.

Anyway - I have 4.9.55 - minus 345c66695569db83eed100723e4df72cb54df7de
running now with networking operational.

thanks,
-- Shuah

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