GNU bug report logs - #76540
Hang on reboot in Guix system

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: dannym <at> friendly-machines.com
Subject: bug#76540: closed (can confirm hang on reboot is gone)
Date: Sun, 30 Mar 2025 21:54:02 +0000

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Your bug report

#76540: Hang on reboot in Guix system

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 76540 <at> debbugs.gnu.org.

-- 
76540: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=76540
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Danny Milosavljevic <dannym <at> friendly-machines.com>
To: 76540-done <at> debbugs.gnu.org
Subject: can confirm hang on reboot is gone
Date: Sun, 30 Mar 2025 23:52:55 +0200

Hi,

I can confirm that shepherd hang on reboot is gone.

(Now I regularily get fsck running after reboot--but I guess that's a
different bug)

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From: dannym <at> friendly-machines.com
To: bug-guix <at> gnu.org, Ludovic Courtès <ludo <at> gnu.org>
Subject: Hang on reboot in Guix system
Date: Tue, 25 Feb 2025 09:06:00 +0100

Hi,

when using a Guix system, it hangs on reboot pretty much every time.

I've tracked it down (using the magic sysrq key) to two processes being 
left over: shepherd(obviously) and virtlogd.

The interesting part of the system config is:

     (service virtlog-service-type
              (virtlog-configuration
               (max-clients 10)))
     (service libvirt-service-type
              (libvirt-configuration
               (keepalive-interval 50)
               (keepalive-count 50)
               (unix-sock-group "libvirt")
               (tls-port "16514")))

Killing virtlogd using sysrq e makes shepherd immediately respawn it 
(!).

Isn't there some shepherd state that says "I'm supposed to shut down, 
don't keep respawning services" ?

For reference, the important sysrq keys are:
  sysrq 9       to increase the log level to 9. After that, you will see 
a line printed every second with the process ids of the processes that 
are still there
  sysrq e       to send SIGTERM to all processes
  sysrq i       to send SIGKILL to all processes
  sysrq t       to see all "tasks"

guix b319256
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: b31925665d07acbb049adf702066b95af2b58b4d

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