netdev - Re: How to compile tcp fast open client app with kernel tfo client support ?

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Date:	Mon, 12 Nov 2012 16:33:54 -0800
From:	Vincent Li <vincent.mc.li@...il.com>
To:	Vijay Subramanian <subramanian.vijay@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Yuchung Cheng <ycheng@...gle.com>, netdev@...r.kernel.org
Subject: Re: How to compile tcp fast open client app with kernel tfo client
 support ?

On Fri, Nov 9, 2012 at 12:54 PM, Vijay Subramanian
<subramanian.vijay@...il.com> wrote:
> On 9 November 2012 12:27, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> On Fri, 2012-11-09 at 12:17 -0800, Vincent Li wrote:
>>
>>> I have tried to run fresh build net-next, for some reason the build
>>> stops ssh service from starting up, tried 3.7.0-rc4 too, same issue. I
>>> don't know if it is new kernel bug or ubuntu upstart bug, but that is
>>> another issue.
>>>
>>
>> Not sure Ubuntu 10.04 binaries can run a 3.7 kernel.
>>
>> Some bug fixes in kernel need bug fixes in userland.
>>
>> You could try a bisection ?
>>
>  I saw the same issue with Ubuntu starting around 3.7.0-rc1 but 3.6
> was fine if I recall. (I did a partial bisection but was not sure it
> was a kernel issue)
>  sshd would not start up on boot and I 'fixed' it by adding the
> following in /etc/rc.local since I assumed it was a userspace issue.
>
> if [ ! -d /var/run/sshd ]; then
>    mkdir /var/run/sshd
>    chmod 0755 /var/run/sshd
> fi
> /usr/sbin/sshd
>
>
> Thanks,
> Vijay

Hi Vijay,

just FYI, I filed a bug report in ubuntu and it appears to be a kernel
commit breaks the user space code that still using deprecated kernel
knobs oom_adj.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1077248

commit 01dc52ebdf472f77cca623ca693ca24cfc0f1bbe
Author: Davidlohr Bueso <dave@....org>
Date: Mon Oct 8 16:29:30 2012 -0700

    oom: remove deprecated oom_adj

    The deprecated /proc/<pid>/oom_adj is scheduled for removal this month.
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