Date: Sat, 19 Jan 2019 00:47:24 +0000
From: Natanael Copa <ncopa@alpinelinux.org>
To: Steffen Nurpmeso <steffen@sdaoden.eu>
Cc: alpine-user@lists.alpinelinux.org
Subject: Re: [alpine-user] Startup hangs (aports: sshd?)
Message-ID: <20190119004724.78b1b0c9@ncopa-macbook.copa.dup.pw>
In-Reply-To: <20190117140207.lqzvY%steffen@sdaoden.eu>
References: <20190117140207.lqzvY%steffen@sdaoden.eu>
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On Thu, 17 Jan 2019 15:02:07 +0100
Steffen Nurpmeso <steffen@sdaoden.eu> wrote:

> Hello.
> 
> After upgrading to [edge] i see a possibly endless hang upon
> startup, which seems to be caused by PRNG init. 

Try add random.trust_cpu=1 as boot option.

See:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=39a8883a2b989d1d21bd8dd99f5557f0c5e89694

and:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.19.y&id=9b25436662d5fb4c66eb527ead53cab15f596ee0

-nc

> I have seen the
> AlpineLinux bug report from two years ago.  I have seen hangs of
> about one to two minutes on the VM since, hmm, not too long, maybe
> two or three months?, and on the bare metal we do hang also about
> a minute.  I presumed it was about PRNG seeding, and, whereas
> i totally dislike that the precious entropy pool i save in between
> boots does not count at all, geeh, what can i do about that...
> Anyway.
> 
> So after upgrading [edge] today i get a possible endless hang, it
> was about eleven minutes before my "homebrew watchdog" caused
> starting of other services, which then overcame the seeding:
> 
>   [   10.386116] random: dnsmasq: uninitialized urandom read (128 bytes read)
>   [  673.619579] random: crng init done
> 
> And this:
> 
>   Jan 17 14:04:14 init: starting pid 1997, tty '': '/sbin/openrc default'
>   ...
>   Jan 17 14:15:09 /etc/init.d/lighttpd[2355]: lighttpd: waiting for sshd (50 seconds)
>   Jan 17 14:15:18 /etc/init.d/lighttpd[2355]: lighttpd: waiting for sshd (41 seconds)
>   Jan 17 14:15:20 lighttpd[2406]: (server.c.1457) server started (lighttpd/1.4.52)
> 
> Eleven minutes!  Maybe longer if left alone!  So if it is like
> that, (why does lighttpd wait for sshd via init.d, btw.??), and if
> people are about to install haveged or whatever, wouldn't it make
> sense to ensure that jitterentropy_rng is loaded during boot, and
> rmmoded later on, unless it is also in /etc/modules?
> 
> --steffen
> |
> |Der Kragenbaer,                The moon bear,
> |der holt sich munter           he cheerfully and one by one
> |einen nach dem anderen runter  wa.ks himself off
> |(By Robert Gernhardt)
> 
> 
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> 



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