GNU bug report logs - #65178
Shepherd hangs (was: Getting Guix to shutdown my laptop properly with Sway and no DE)

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Package: guix; Severity: important; Reported by: Hilton Chain <hako@HIDDEN>; merged with #65419; dated Wed, 9 Aug 2023 12:43:02 UTC; Maintainer for guix is bug-guix@HIDDEN.
Severity set to 'important' from 'normal' Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Merged 65178 65419. Request was from Ludovic Courtès <ludo@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Hilton Chain <hako@HIDDEN>
To: Ludovic =?ISO-8859-1?Q?Court=E8s?= <ludo@HIDDEN>
Subject: Re: bug#65178: Shepherd hangs (was: Getting Guix to shutdown my
 laptop properly with Sway and no DE)
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Information forwarded to bug-guix@HIDDEN:
bug#65178; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Hilton Chain <hako@HIDDEN>
Subject: Re: bug#65178: Shepherd hangs (was: Getting Guix to shutdown my
 laptop properly with Sway and no DE)
References: <NZXMeM4--3-9@HIDDEN> <87bkfg1j7b.wl-hako@HIDDEN>
 <87leefx8u0.wl-hako@HIDDEN>
 <87y1icmohn.wl-hako@HIDDEN>
Date: Sat, 02 Sep 2023 22:49:35 +0200
In-Reply-To: <87y1icmohn.wl-hako@HIDDEN> (Hilton Chain's message of
 "Tue, 15 Aug 2023 21:20:04 +0800")
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Hi!

Hilton Chain <hako@HIDDEN> scribes:

> On Sun, 13 Aug 2023 23:25:59 +0800,
> Hilton Chain wrote:
>>
>> Today I encountered the home reconfiguration issue.  The behavior is
>> similar to <https://issues.guix.gnu.org/54919>.
>
> And today Shepherd hung after starting a service [1], the service
> itself started successfully (process started, logs available):

I=E2=80=99m assuming this is shepherd 0.10.2, right?

> $ sudo herd enable cloudflare-tunnel && sudo herd start cloudflare-tunnel
> Enabled service cloudflare-tunnel.
>
> [1]: <https://codeberg.org/hako/Rosenthal/src/commit/c7dc95c2932d7362673c=
28cdc2f52e6bb8357c18/rosenthal/services/child-error.scm#L151>

Is any of the services you=E2=80=99re using doing =E2=80=9Cnon-standard thi=
ngs=E2=80=9D such as
using constructors/destructors other than those provided by shepherd
(=E2=80=98make-forkexec-constructor=E2=80=99 et al.)?

Is it reproducible, and do you think you could come up with a reduce
test case (for example by removing services from the config until you
reach the minimum)?

Thanks,
Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#65178; Package guix. Full text available.

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From: Hilton Chain <hako@HIDDEN>
To: 65178 <at> debbugs.gnu.org
Subject: Re: Shepherd hangs (was: Getting Guix to shutdown my laptop properly
 with Sway and no DE)
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On Sun, 13 Aug 2023 23:25:59 +0800,
Hilton Chain wrote:
>
> Today I encountered the home reconfiguration issue.  The behavior is
> similar to <https://issues.guix.gnu.org/54919>.

And today Shepherd hung after starting a service [1], the service
itself started successfully (process started, logs available):
--8<---------------cut here---------------start------------->8---
$ sudo herd enable cloudflare-tunnel && sudo herd start cloudflare-tunnel
Enabled service cloudflare-tunnel.

--8<---------------cut here---------------end--------------->8---

[1]: <https://codeberg.org/hako/Rosenthal/src/commit/c7dc95c2932d7362673c28cdc2f52e6bb8357c18/rosenthal/services/child-error.scm#L151>
Information forwarded to bug-guix@HIDDEN:
bug#65178; Package guix. Full text available.

Message received at 65178 <at> debbugs.gnu.org:


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From: Hilton Chain <hako@HIDDEN>
To: 65178 <at> debbugs.gnu.org
Subject: Re: Shepherd hangs (was: Getting Guix to shutdown my laptop properly
 with Sway and no DE)
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On Wed, 09 Aug 2023 20:41:44 +0800,
Hilton Chain wrote:
> I'm not sure if Shepherd hangs at usual, but most of the time I find
> it already hanging is when doing a reconfiguration.  The
> reconfiguration becomes unresponsive and it won't accept a ^C, herd
> actions also hang.  This usually happens with home reconfiguration,

Today I encountered the home reconfiguration issue.  The behavior is
similar to <https://issues.guix.gnu.org/54919>.

Ending part of output for the hanging reconfiguration:
--8<---------------cut here---------------start------------->8---
[...]
Symlinking /home/hako/.config/fontconfig/fonts.conf -> /gnu/store/fvvqbma1xxgisfcq7rrwihbw7jwnyliv-fonts.conf... done
Symlinking /home/hako/.gnupg/gpg-agent.conf -> /gnu/store/kfaz4zrxmfz6p72x47c7qrqvb873gbyi-gpg-agent.conf... done
Symlinking /home/hako/.ssh/config -> /gnu/store/xb6f584pwclg48fr28wl21v1mxplqp6f-ssh.conf... done
Symlinking /home/hako/.icons/default/index.theme -> /gnu/store/3sraq69nrs04ii0fjgk36aw2c57q6z27-icons.theme... done
 done
Finished updating symlinks.


--8<---------------cut here---------------end--------------->8---

And `herd status' also hangs:
--8<---------------cut here---------------start------------->8---
$ herd status

--8<---------------cut here---------------end--------------->8---
Information forwarded to bug-guix@HIDDEN:
bug#65178; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Hilton Chain <hako@HIDDEN>
To: bug-guix@HIDDEN
Subject: Shepherd hangs (was: Getting Guix to shutdown my laptop properly with
 Sway and no DE)
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Hello!

I have experienced many instances of Shepherd hanging through my use
of Guix, though I don't have a clear record of when it first happened.

These days I have seen a few reports on the subject.  With a quick
search of recent bug reports, I can't find any related, only to find
this thread [1] on help-guix.  So I'll start a bug report here, but I
don't know how to debug Shepherd and I haven't found a way to
reproduce it stably.

I'm not sure if Shepherd hangs at usual, but most of the time I find
it already hanging is when doing a reconfiguration.  The
reconfiguration becomes unresponsive and it won't accept a ^C, herd
actions also hang.  This usually happens with home reconfiguration,
but I can remember once with system reconfiguration when adding and
deleting some services in the configuration file.

I'm not sure how Shepherd hangs either, because in the latter case
(system one) I can still see logs indicating that it's trying to
respawn a process I killed manually, even though that's just a output
and no processes are actually spawned.

And as shown in [1], there are also cases where Shepherd hangs at some
point in the halting process, usually after syslogd has been
terminated but before term-tty*.

(The termination message indicates that Shepherd is still functional,
and no logs after that point shows that that's a real action, but
because of this I can't know anything happened further either.  After
that I'm still able to switch ttys so I assume term-tty* are alive.)

Although I don't know how they are related, I have linked my
configurations below:
<https://codeberg.org/hako/Testament/src/branch/trunk/dorphine-home.scm>
<https://codeberg.org/hako/Testament/src/branch/trunk/dorphine-system.scm>

Thanks

[1]:
<https://lists.gnu.org/archive/html/help-guix/2023-07/msg00021.html>
(public-inbox mirror on yhetil.org)
<https://yhetil.org/guix/NZXMeM4--3-9@HIDDEN/t/#u>
Acknowledgement sent to Hilton Chain <hako@HIDDEN>:
New bug report received and forwarded. Copy sent to danclm@HIDDEN, contact@HIDDEN, skyvine@HIDDEN, ignas@HIDDEN, etienne.roesch@HIDDEN, chris@HIDDEN, bug-guix@HIDDEN. Full text available.
Report forwarded to danclm@HIDDEN, contact@HIDDEN, skyvine@HIDDEN, ignas@HIDDEN, etienne.roesch@HIDDEN, chris@HIDDEN, bug-guix@HIDDEN:
bug#65178; Package guix. Full text available.
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