linux-kernel - Re: Bug#912087: openssh-server: Slow startup after the upgrade to 7.9p1

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Date:   Fri, 2 Nov 2018 01:24:25 +0100
From:   Kurt Roeckx <kurt@...ckx.be>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
        912087@...s.debian.org,
        "Package Development List for OpenSSL packages." 
        <pkg-openssl-devel@...oth-lists.debian.net>,
        linux-kernel@...r.kernel.org,
        Bernhard Übelacker <bernhardu@...lbox.org>,
        pkg-systemd-maintainers@...ts.alioth.debian.org,
        debian-ssh@...ts.debian.org, 912087-submitter@...s.debian.org
Subject: Re: Bug#912087: openssh-server: Slow startup after the upgrade to
 7.9p1

On Thu, Nov 01, 2018 at 07:50:35PM -0400, Theodore Y. Ts'o wrote:
> On Thu, Nov 01, 2018 at 11:18:14PM +0100, Sebastian Andrzej Siewior wrote:
> > Okay. So you wrote what can be done for a system with HW-RNG/kvm. On
> > bare metal with nothing fancy I have:
> > [    3.544985] systemd[1]: systemd 239 running in system mode. (+PAM…
> > [   10.363377] r8169 0000:05:00.0 eth0: link up
> > [   41.966375] random: crng init done
> > 
> > which means I have to wait about half a minute until I can ssh into. And
> > there is no way to speed it up?
> 
> So that surprises me.  Can you tell me more about the hardware?  Is it
> something like a Rasberry Pi?  Or is it an x86 server or desktop?  In
> my experience for most x86 platforms this isn't an issue.

The original poster had:
Architecture: amd64 (x86_64)
Kernel: Linux 4.18.0-2-amd64 (SMP w/2 CPU cores)

But I'm not sure if that's a real machine or some virtual host,
I'm going to guess it's a virtual host.

Anyway, on my laptop I get:
[   12.675935] random: crng init done

If the TPM is enabled, I also have an /etc/hwrng, but rng-tools is
started later after the init is done.

On my desktop (with a chaos key attached)
[    3.844484] random: crng init done
[    5.312406] systemd[1]: systemd 239 running in system mode.


Kurt