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
[off-list ref] wrote:

On 9 November 2012 12:27, Eric Dumazet [off-list ref] wrote:

quoted

On Fri, 2012-11-09 at 12:17 -0800, Vincent Li wrote:

quoted

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 [off-list ref]
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.