Date: Sat, 19 Jan 2019 18:15:35 +0100
From: Steffen Nurpmeso <steffen@sdaoden.eu>
To: Natanael Copa <ncopa@alpinelinux.org>
Cc: alpine-user@lists.alpinelinux.org
Subject: Re: [alpine-user] Startup hangs (aports: sshd?)
Message-ID: <20190119171535.pcxs8%steffen@sdaoden.eu>
In-Reply-To: <20190119004724.78b1b0c9@ncopa-macbook.copa.dup.pw>
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Natanael Copa wrote in <20190119004724.78b1b0c9@ncopa-macbook.copa.dup.pw>:
 |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.

Will do when i finally can upgrade to 4.19.y series.  Merci.

 |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

I am back at 4.14.89 since the nf_conntrack crashes persist, and
even 4.19.16 does not seem to have anything related.  (4.19.15
had, but crashes, ehm, persist.)  That is: i have to wait.

But ok i mean all that seems to be problematic, for example with
the program i have posted:

  #?64|xhost:/etc/init.d# /sbin/entropy-saver save
  - 1588 bits of entropy available at /dev/random
  - 2422 bits of entropy remain at /dev/random
  Insufficient entropy to save from /dev/random (-834 bits)

Two adjacent ioctl() asking for entropy_avail with just one read
(!) of /dev/random in between causes the entropy to explode!
This _cannot_ be right, can it?
Thereafter it works for the second try:

  #?0|xhost:/etc/init.d# /sbin/entropy-saver save
  - 2435 bits of entropy available at /dev/random
  - 1411 bits of entropy remain at /dev/random
  - 1024 bits / 80 bytes of entropy saved to /var/lib/misc/random.dat

Very weakly rated, this stuff.
Say, isn't that flaky?  This VM really crawls along, with
jitterentropy, with haveged, and with the above.  While i am
writing, the entropy went down to 1343, with only postfix
(urandom), mailman (1000 x urandom), dnsmasq (using internal surf
rand with one-time seeding), lighttpd (uses getrandom/urandom)
and cgit running.  Whereas my laptop is stable at 38xy.

So sorry to bother you all with this!
I will turn to use linux-virt on the VM.  Sorry for the noise.

A nice weekend i wish.

--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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