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From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Justin Forbes <jmforbes@linuxtx.org>
Cc: Jeremy Cline <jeremy@jcline.org>,
	Sultan Alsawaf <sultanxda@gmail.com>, Pavel Machek <pavel@ucw.cz>,
	LKML <linux-kernel@vger.kernel.org>, Jann Horn <jannh@google.com>
Subject: Re: Linux messages full of `random: get_random_u32 called from`
Date: Wed, 2 May 2018 12:26:53 -0400	[thread overview]
Message-ID: <20180502162653.GB3461@thunk.org> (raw)
In-Reply-To: <CAFxkdAp83uWnju0KZKd2edveuzmiDW_sqMORC7uoR+pwgQECNw@mail.gmail.com>

On Wed, May 02, 2018 at 07:09:11AM -0500, Justin Forbes wrote:
> Yes, Fedora libgcrypt is carrying a patch which makes it particularly
> painful for us, we have reached out to the libgcrypt maintainer to
> follow up on that end. But as I said before, even without that code
> path (no dracut-fips) we are seeing some instances of 4 minute boots.
> This is not really a workable user experience.  And are you sure that
> every cloud platform and VM platform offers, makes it possible to
> config virtio-rng?

Unfortunately, the answer is no.  Google Compute Engine, alas, does
not currently support virtio-rng.  With my Google hat on, I can't
comment on future product features.  With my upstream developer hat
on, I'll give you three guesses what I have been advocating and
pushing for internally, and the first two don't count.  :-)

That being said, I just booted a Debian 9 (Stable, aka Stretch)
standard kernel, and then installed 4.17-rc3 (which has the
CVE-2018-1108 patches).  The crng_init=2 message doesn't appear
immediately, and it does appear quite a bit later comapred to
the standard 4.9.0-6-amd64 Debian 9 kernel.  However, the lack of a
fully initialized random pool doesn't prevent the standard Debian 9
image from booting:

May  2 15:33:42 localhost kernel: [    0.000000] Linux version 4.17.0-rc3-xfstests (tytso@cwcc) (gcc version 7.3.0 (Debian 7.3.0-16)) #169 SMP Wed May 2 11:28:17 EDT 2018
May  2 15:33:42 localhost kernel: [    1.456883] random: fast init done
May  2 15:33:46 rng-testing systemd[1]: Startup finished in 3.202s (kernel) + 5.963s (userspace) = 9.166s.
May  2 15:33:46 rng-testing google-accounts: INFO Starting Google Accounts daemon.
May  2 15:44:39 rng-testing kernel: [  661.436664] random: crng init done

So it really does appear to be something going on with Fedora's
userspace; can you help try to track down what it is?

Thanks,

						- Ted

  reply	other threads:[~2018-05-02 16:26 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26  4:11 Sultan Alsawaf
2018-04-26  5:00 ` Theodore Y. Ts'o
2018-04-26  5:05   ` Sultan Alsawaf
2018-04-26  7:32     ` Theodore Y. Ts'o
2018-04-26 15:17       ` Sultan Alsawaf
2018-04-26 19:25         ` Theodore Y. Ts'o
2018-04-26 20:22           ` Sultan Alsawaf
2018-04-26 20:47             ` Christian Brauner
2018-04-27  0:00               ` Theodore Y. Ts'o
2018-04-27 15:38                 ` Jason A. Donenfeld
2018-04-27 19:14                   ` Theodore Y. Ts'o
2018-04-26 23:56             ` Theodore Y. Ts'o
2018-04-27  5:20               ` Sultan Alsawaf
2018-04-27 20:10                 ` Theodore Y. Ts'o
2018-04-27 22:59                   ` Sultan Alsawaf
2018-04-29 14:32                   ` Pavel Machek
2018-04-29 17:05                     ` Sultan Alsawaf
2018-04-29 18:41                       ` Pavel Machek
2018-04-29 20:20                         ` Sultan Alsawaf
2018-04-29 21:18                           ` Pavel Machek
2018-04-29 21:34                             ` Sultan Alsawaf
2018-04-29 22:05                           ` Theodore Y. Ts'o
2018-04-29 22:26                             ` Sultan Alsawaf
2018-04-29 22:43                               ` Jason A. Donenfeld
2018-04-29 22:49                                 ` Sultan Alsawaf
2018-04-30  0:11                                   ` Theodore Y. Ts'o
2018-04-30  4:34                                     ` Sultan Alsawaf
2018-04-30 16:11                                       ` Theodore Y. Ts'o
2018-05-01 19:53                                         ` Pavel Machek
2018-04-29 22:43                             ` Pavel Machek
2018-04-30  0:32                             ` Laura Abbott
2018-04-30 21:12                             ` Jeremy Cline
2018-05-01 11:52                               ` Justin Forbes
2018-05-01 12:55                                 ` Theodore Y. Ts'o
2018-05-01 22:35                                   ` Justin Forbes
2018-05-02  0:02                                     ` Theodore Y. Ts'o
2018-05-02 12:09                                       ` Justin Forbes
2018-05-02 16:26                                         ` Theodore Y. Ts'o [this message]
2018-05-02 17:49                                           ` Laura Abbott
2018-05-02 22:25                                             ` Theodore Y. Ts'o
2018-05-03  6:19                                               ` Pavel Machek
2018-05-03 12:23                                               ` Justin Forbes
2018-05-02  0:43                                     ` Sultan Alsawaf
2018-05-02  0:56                                       ` Theodore Y. Ts'o
2018-05-02  1:11                                         ` Sultan Alsawaf
2018-04-29 18:30                   ` Sultan Alsawaf
2018-04-29 20:08                     ` Theodore Y. Ts'o
2018-05-18  1:27                   ` Trent Piepho
2018-05-18  2:32                     ` Theodore Y. Ts'o
2018-05-18 22:56                       ` Trent Piepho
2018-05-18 23:22                         ` Theodore Y. Ts'o
2018-05-21 18:39                           ` Trent Piepho
2018-04-29 14:29               ` Pavel Machek
  -- strict thread matches above, loose matches on Subject: below --
2018-04-24 11:48 Paul Menzel
2018-04-24 13:56 ` Theodore Y. Ts'o
2018-04-24 14:30   ` Paul Menzel
2018-04-24 15:49   ` Theodore Y. Ts'o
2018-04-24 15:56     ` Paul Menzel
2018-04-25  7:41       ` Theodore Y. Ts'o
2018-04-26  3:48         ` Paul Menzel
2018-04-29 14:22           ` Pavel Machek
2018-04-29 23:02   ` Dave Jones
2018-04-29 23:07     ` Dave Jones
2018-04-30  0:21       ` Theodore Y. Ts'o
2018-04-26  5:51 ` Pavel Machek

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