GNU logs - #76315, boring messages

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Subject: bug#76315: System does not boot after switching to system-log service
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--=-=-=
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Hello,

after pulling recent Guix, I got this error during guix deploy:

=2D-8<---------------cut here---------------start------------->8---
guix deploy: warning: an error occurred while upgrading services on '127.0.=
0.1':
%exception #<inferior-object #<&service-not-found-error service: system-log=
>>=20
=2D-8<---------------cut here---------------end--------------->8---

After rebooting, the system got stack during startup.  No error message
was visible, it was just hanging.

Booting to previous generation did work.

Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Tomas Volf <~@wolfsden.cz>
Subject: bug#76315: Acknowledgement (System does not boot after switching
 to system-log service)
Message-ID: <handler.76315.B.173966652517396.ack <at> debbugs.gnu.org>
References: <87bjv267qp.fsf@HIDDEN>
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Date: Sun, 16 Feb 2025 00:43:02 +0000

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Subject: bug#76315: System does not boot after switching to system-log service
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Date: Sun, 16 Feb 2025 15:23:12 +0100
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--==-=-=
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--=-=-=
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I have put together a reproducer in a VM:

1. Install Guix system using 1.4.0 installer
  --> Include sshd, openbox

2. Reboot
3. Copy the /run/current-system/configuration.scm out of the VM
4. Adjust the configuration.scm (full file attached)
4.1 Allow NOPASSWD sudo
  (sudoers-file
   (plain-file "sudoers"
               (string-append (plain-file-content %sudoers-specification)
                              (format #f "x ALL =3D NOPASSWD: ALL~%"))))
4.2 Use %base-services, delete set-xorg-configuration service
4.3 Add dhcp-client-service-type service.
4.4 Authorize your key
  (simple-service
   'extra-authorized-keys guix-service-type
   (guix-extension
    (authorized-keys (list
                      (local-file "/etc/guix/signing-key.pub")))))

5. Manually tweak /etc/sudoers to support NOPASSWD for user x
6. Create machine configuration (full file attached)

7. Guix deploy the machine using b99df83c591104655a6b387817d8f7bb3c50204c
8. Reboot

9. Guix deploy the machine using 1afbf48b250f667ce45de40a6c275e3e42ade67c
  --> See the following error:
=20=20
=2D-8<---------------cut here---------------start------------->8---
building path(s) `/gnu/store/zdknxv3knkkxx52nwfbz120p32z4j2aa-upgrade-sheph=
erd-services.scm'
building path(s) `/gnu/store/x7bzglpc0vvr5ak24k3i33ikq5ph8sfx-remote-exp.sc=
m'
guix deploy: warning: an error occurred while upgrading services on 'localh=
ost':
%exception #<inferior-object #<&service-not-found-error service: system-log=
>>=20
=2D-8<---------------cut here---------------end--------------->8---

A. Reboot
  --> The system does not come up (I gave it ~10 minutes).


--=-=-=
Content-Type: text/x-scheme
Content-Disposition: inline; filename=config.scm
Content-Description: operating-system configuration

;; This is an operating system configuration generated
;; by the graphical installer.
;;
;; Once installation is complete, you can learn and modify
;; this file to tweak the system configuration, and pass it
;; to the 'guix system reconfigure' command to effect your
;; changes.


;; Indicate which modules to import to access the variables
;; used in this configuration.
(use-modules (gnu))
(use-service-modules cups desktop networking ssh xorg)

(operating-system
  (locale "en_US.utf8")
  (timezone "Europe/Prague")
  (keyboard-layout (keyboard-layout "us"))
  (host-name "x")

  ;; The list of user accounts ('root' is implicit).
  (users (cons* (user-account
                 (name "x")
                 (comment "X")
                 (group "users")
                 (home-directory "/home/x")
                 (supplementary-groups '("wheel" "netdev" "audio" "video")))
                %base-user-accounts))

  ;; Packages installed system-wide.  Users can also install packages
  ;; under their own account: use 'guix search KEYWORD' to search
  ;; for packages and 'guix install PACKAGE' to install a package.
  (packages (append (list (specification->package "openbox")
                          (specification->package "nss-certs"))
                    %base-packages))

  (sudoers-file
   (plain-file "sudoers"
               (string-append (plain-file-content %sudoers-specification)
                              (format #f "x ALL = NOPASSWD: ALL~%"))))

  ;; Below is the list of system services.  To search for available
  ;; services, run 'guix system search KEYWORD' in a terminal.
  (services
   (append (list
            (service dhcp-client-service-type)
            ;; To configure OpenSSH, pass an 'openssh-configuration'
            ;; record as a second argument to 'service' below.
            (service openssh-service-type)

            (simple-service
             'extra-authorized-keys guix-service-type
             (guix-extension
              (authorized-keys (list
                                (local-file "/etc/guix/signing-key.pub"))))))

           ;; This is the default list of services we
           ;; are appending to.
           %base-services))
  (bootloader (bootloader-configuration
               (bootloader grub-efi-bootloader)
               (targets (list "/boot/efi"))
               (keyboard-layout keyboard-layout)))
  (swap-devices (list (swap-space
                        (target (uuid
                                 "aa8dee07-5bf4-4ad2-8db7-8ee6139d6fc5")))))

  ;; The list of file systems that get "mounted".  The unique
  ;; file system identifiers there ("UUIDs") can be obtained
  ;; by running 'blkid' in a terminal.
  (file-systems (cons* (file-system
                         (mount-point "/boot/efi")
                         (device (uuid "79EB-4D57"
                                       'fat32))
                         (type "vfat"))
                       (file-system
                         (mount-point "/")
                         (device (uuid
                                  "11d0a98d-7200-4a9b-ae0a-0cb4db3e808d"
                                  'ext4))
                         (type "ext4")) %base-file-systems)))

--=-=-=
Content-Type: text/x-scheme
Content-Disposition: inline; filename=machine.scm
Content-Description: machine configuration

(use-modules (gnu))

(use-service-modules networking ssh)
(use-package-modules bootloaders)

(list (machine
       (operating-system (primitive-load "config.scm"))
       (environment managed-host-environment-type)
       (configuration (machine-ssh-configuration
                       (build-locally? #f)
                       (host-name "localhost")
                       (system "x86_64-linux")
                       (user "x")
                       (port 8888)))))

--=-=-=--

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severity 76315 important
quit

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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

> A. Reboot
>   --> The system does not come up (I gave it ~10 minutes).

I tried the config file you gave with:

  ./pre-inst-env guix system vm /tmp/config.scm

and it hangs, to my surprise (I=E2=80=99ve been using =E2=80=98system-log=
=E2=80=99 on my laptop
since June, and =E2=80=9Cmake check-system TESTS=3Dbasic=E2=80=9D & co. pas=
s).

I=E2=80=99ll keep investigating and probably revert the change in the inter=
im.

Ludo=E2=80=99.

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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:

> I=E2=80=99ll keep investigating and probably revert the change in the int=
erim.

Reverted in 8c483c12e94bcf43e4c44170f1d5fea5fbba4970.

Ludo'.

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Hey Tomas,

Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:

> I tried the config file you gave with:
>
>   ./pre-inst-env guix system vm /tmp/config.scm
>
> and it hangs, to my surprise (I=E2=80=99ve been using =E2=80=98system-log=
=E2=80=99 on my laptop
> since June, and =E2=80=9Cmake check-system TESTS=3Dbasic=E2=80=9D & co. p=
ass).

After spending hours on this and fixing improbable issues in the
Shepherd (will push shortly), I found that the root of the problem is
exactly what I feared and which led to the patches at
<https://issues.guix.gnu.org/76262>.

Namely, =E2=80=98dhcp-client-service-type=E2=80=99 calls =E2=80=98waitpid=
=E2=80=99; that call competes
with the one done by shepherd=E2=80=99s SIGCHLD handler and, if you=E2=80=
=99re unlucky,
it loses the race and waits forever.  (I=E2=80=99m using
=E2=80=98network-manager-service-type=E2=80=99 on my laptop, which is why I=
 did not
stumble upon this bug.)

Could you try your config with the patch at
<https://issues.guix.gnu.org/76262#2>, at least in a VM and ideally on
the metal?

Thanks in advance,
Ludo=E2=80=99.

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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:

> Could you try your config with the patch at
> <https://issues.guix.gnu.org/76262#2>, at least in a VM and ideally on
> the metal?

You need to do that on top of a pre-revert commit, such as
eba8c08b1bfc7ac333a0eda658a0be5acac7f151.

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Date: Thu, 20 Feb 2025 22:32:03 +0100
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Hey Tomas,
>
> Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
>
>> I tried the config file you gave with:
>>
>>   ./pre-inst-env guix system vm /tmp/config.scm
>>
>> and it hangs, to my surprise (I=E2=80=99ve been using =E2=80=98system-lo=
g=E2=80=99 on my laptop
>> since June, and =E2=80=9Cmake check-system TESTS=3Dbasic=E2=80=9D & co. =
pass).
>
> After spending hours on this and fixing improbable issues in the
> Shepherd (will push shortly), I found that the root of the problem is
> exactly what I feared and which led to the patches at
> <https://issues.guix.gnu.org/76262>.
>
> Namely, =E2=80=98dhcp-client-service-type=E2=80=99 calls =E2=80=98waitpid=
=E2=80=99; that call competes
> with the one done by shepherd=E2=80=99s SIGCHLD handler and, if you=E2=80=
=99re unlucky,
> it loses the race and waits forever.

Observation here.  While yes, based on the description I agree that it
is (bad) luck based, in practice it seems to be extremely reliable to
reproduce.

At first I struggled to reproduce again, it did not hang even single
time (out of 5 tries) on the bad commit, but once I reverted my
configuration to what it was back then (=3D=3D removed few shepherd timers),
the hang started happening every single time.

So, while in theory it should be a probabilistic problem, in practice it
does not seem to be the case.  Not sure where I am going with this, I
just think it is interesting.

>
> Could you try your config with the patch at
> <https://issues.guix.gnu.org/76262#2>, at least in a VM and ideally on
> the metal?

I have reverted your revert and applied the patch 2 on top of that.

Steps I took (both in VM and on a spare laptop):

1. Reconfigure from commit 1.
2. Ensure it still hangs (5x).
3. Reconfigure from commit 2.
4. Ensure it no longer hangs (5x).

I can confirm the patch 2 fixes the issue for me, both in the VM and on
physical machine.

Only thing I have noticed that even when deploying the "good" commit, I
see the following error in the log:

=2D-8<---------------cut here---------------start------------->8---
guix deploy: warning: an error occurred while upgrading services on '127.0.=
0.1':
%exception #<inferior-object #<&service-not-found-error service: system-log=
>>
=2D-8<---------------cut here---------------end--------------->8---

The system comes up fine after reboot though.

>
> Thanks in advance,
> Ludo=E2=80=99.

Thank you for figuring this one out. :)

Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
In-Reply-To: <87pljcwbe4.fsf@HIDDEN> (Tomas Volf's message of "Thu, 20
 Feb 2025 22:32:03 +0100")
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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

>> After spending hours on this and fixing improbable issues in the
>> Shepherd (will push shortly), I found that the root of the problem is
>> exactly what I feared and which led to the patches at
>> <https://issues.guix.gnu.org/76262>.
>>
>> Namely, =E2=80=98dhcp-client-service-type=E2=80=99 calls =E2=80=98waitpi=
d=E2=80=99; that call competes
>> with the one done by shepherd=E2=80=99s SIGCHLD handler and, if you=E2=
=80=99re unlucky,
>> it loses the race and waits forever.
>
> Observation here.  While yes, based on the description I agree that it
> is (bad) luck based, in practice it seems to be extremely reliable to
> reproduce.

Yes, I could reproduce it 100% with just =E2=80=98bare-bones.tmpl=E2=80=99.=
  Thing is,
as soon as you would change something non-trivial, for instance the
=E2=80=98message-destination=E2=80=99 procedure of shepherd so that it writ=
es everything
to /dev/console, the problem would go away.  Even just commenting out
some of the parameters passed to =E2=80=98system-log=E2=80=99 could make th=
e problem
disappear (!), which is why it took me a lot of time to figure it out.

>> Could you try your config with the patch at
>> <https://issues.guix.gnu.org/76262#2>, at least in a VM and ideally on
>> the metal?

[...]

> I can confirm the patch 2 fixes the issue for me, both in the VM and on
> physical machine.

Yay!

> Only thing I have noticed that even when deploying the "good" commit, I
> see the following error in the log:
>
> guix deploy: warning: an error occurred while upgrading services on '127.=
0.0.1':
> %exception #<inferior-object #<&service-not-found-error service: system-l=
og>>

I think I understood this one now.

The old service has only one name: syslogd.  The new one, which upgrades
it, has two names: system-log and syslogd (system-log is its =E2=80=9Ccanon=
ical
name=E2=80=9D).

The service upgrade machinery gets confused because it uses the
canonical name in one place.

I=E2=80=99ll investigate.

Ludo=E2=80=99.

Last modified: Fri, 21 Feb 2025 11:30:04 UTC

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