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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

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

Message #8 received at 76540 <at> debbugs.gnu.org (full text, mbox):

From: Ashvith Shetty <ashvithshetty0010 <at> zohomail.in>
To: 76540 <at> debbugs.gnu.org
Cc: Ludovic Courtès <ludo <at> gnu.org>,
 dannym <dannym <at> friendly-machines.com>
Subject: Re: Hang on reboot in Guix system
Date: Tue, 25 Feb 2025 14:58:09 +0530

Hi,

This has been resolved - see https://issues.guix.gnu.org/76338#17 for
for information.

Regards,
Ashvith

Message #13 received at 76540-done <at> debbugs.gnu.org (full text, mbox):

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)

Message #16 received at 76540 <at> debbugs.gnu.org (full text, mbox):

From: Sebastian Dümcke <code <at> sam-d.com>
To: 76540 <at> debbugs.gnu.org
Subject: Hang on reboot in Guix system
Date: Mon, 31 Mar 2025 19:28:59 +0200

Dear Danny,

the fsck bug after reboot is tracked here: #77086
https://issues.guix.gnu.org/77086

We are still looking for reproducers, could you please report your 
issues in the thread?

Thanks
Sebastian

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