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From: Christian Brauner <christian.brauner@canonical.com>
To: Sultan Alsawaf <sultanxda@gmail.com>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>,
	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 22:47:49 +0200	[thread overview]
Message-ID: <20180426204748.GA7540@gmail.com> (raw)
In-Reply-To: <2add15cb-2113-0504-a732-81255ea61bf5@gmail.com>

On Thu, Apr 26, 2018 at 01:22:02PM -0700, Sultan Alsawaf wrote:
> > 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
> 
> I removed snapd completely which did nothing.
> 
> Here are new logs:
> systemd-analyze blame: https://hastebin.com/edehikuyeb.css
> systemd-analyze critical-chain: https://hastebin.com/vedufafema.pl
> dmesg: https://hastebin.com/zuwuwoxadu.vbs
> 
> I should also note that leaving the system untouched does not result in it booting: I must
> provide a source of entropy, otherwise it just stays stuck. In both of the dmesgs I've given, I

We have observed a similiar problem  with libvirt. As soon as entropy is
provided the boot finishes otherwise it hangs for a long time.
This is not happening with v4.17-rc1 afaict.

Christian

> manually provided entropy to the system after about 5 minutes of waiting.
> 
> Also, regardless of what's hanging on CRNG init, CRNG should be able to init on its own in a timely
> manner without the need for user-provided entropy. Userspace was working fine before the recent CRNG
> kernel changes, so I don't think this is a userspace bug.
> 
> -Sultan
> 

  reply	other threads:[~2018-04-26 20:47 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 [this message]
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

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