LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Sultan Alsawaf <sultanxda@gmail.com>
Cc: linux-kernel@vger.kernel.org, Jann Horn <jannh@google.com>
Subject: Re: Linux messages full of `random: get_random_u32 called from`
Date: Thu, 26 Apr 2018 15:25:24 -0400	[thread overview]
Message-ID: <20180426192524.GD5965@thunk.org> (raw)
In-Reply-To: <b6aa3fac-a768-e27d-3070-00d929ebc245@gmail.com>

On Thu, Apr 26, 2018 at 08:17:34AM -0700, Sultan Alsawaf wrote:
> > Hmm, can you let the boot hang for a while?  It should continue after
> > a few minutes if you wait long enough, but wait a minute or two, then
> > give it entropy so the boot can continue.  Then can you use
> > "systemd-analyze blame" or "systemd-analyize critical-chain" and we
> > can see what process was trying to get randomness during the boot
> > startup and blocking waiting for the CRNG to be fully initialized.
> >
> > 	    	     	     	     - Ted
> 
> systemd-analyze blame: https://hastebin.com/ikipavevew.css
> systemd-analyze critical-chain: https://hastebin.com/odoyuqeges.pl
> dmesg: https://hastebin.com/waracebeja.vbs
>

Hmm, it looks like the multiuser startup is getting blocked on snapd:

         29.060s snapd.service

graphical.target @1min 32.145s
└─multi-user.target @1min 32.145s
  └─hddtemp.service @6.512s +28ms
    └─network-online.target @6.508s
      └─NetworkManager-wait-online.service @2.428s +4.079s
        └─NetworkManager.service @2.016s +404ms
          └─dbus.service @1.869s
            └─basic.target @1.824s
              └─sockets.target @1.824s
                └─snapd.socket @1.821s +1ms
                  └─sysinit.target @1.812s
                    └─apparmor.service @587ms +1.224s
                      └─local-fs.target @585ms
                        └─local-fs-pre.target @585ms
                          └─keyboard-setup.service @235ms +346ms
                            └─systemd-journald.socket @226ms
                              └─system.slice @225ms
                                └─-.slice @220ms

This appears to be some kind of new package management system for
Ubuntu:

Description-en: Tool to interact with Ubuntu Core Snappy.
 Install, configure, refresh and remove snap packages. Snaps are
 'universal' packages that work across many different Linux systems,
 enabling secure distribution of the latest apps and utilities for
 cloud, servers, desktops and the internet of things.

Why it the Ubuntu package believes it needs to be fully started before
the login screen can display is unclear to me.  It might be worth
using systemctl to disable snapd.serivce and see if that makes things
work better for you.

				- Ted

  reply	other threads:[~2018-04-26 19:25 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 [this message]
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
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180426192524.GD5965@thunk.org \
    --to=tytso@mit.edu \
    --cc=jannh@google.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sultanxda@gmail.com \
    --subject='Re: Linux messages full of `random: get_random_u32 called from`' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).