GNU bug report logs - #77943
[PATCH 0/2] Using the Shepherd's system log on the Hurd

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Package: guix-patches; Reported by: Ludovic Courtès <ludo@HIDDEN>; Keywords: patch; dated Sun, 20 Apr 2025 15:54:02 UTC; Maintainer for guix-patches is guix-patches@HIDDEN.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: yelninei@HIDDEN
Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
 #:kernel-log-file on the Hurd.
In-Reply-To: <OWf4UUz--F-9@HIDDEN> (yelninei@HIDDEN's message of
 "Sat, 2 Aug 2025 16:00:58 +0200 (CEST)")
References: <cover.1745163830.git.ludo@HIDDEN>
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Hello,

yelninei@HIDDEN writes:

> I found where the error gets set (debugging global variables is not fun)
>
> As a reminder we get the D_WOULD_BLOCK error back from the initial=20
>
> if(err)
> =C2=A0 =C2=A0 return err;
> check in dev_read.
>
> In our case this comes from device_read_reply_inband from the errorcode p=
arameter. I am not yet sure where/how this gets called.
>
> My little C example now returns EWOULDBLOCK when reaching the "end" of /d=
ev/klog.

So you have a patch for /hurd/streamio and a C reproducer?  (Maybe you
sent it already and I haven=E2=80=99t seen.)

> However this does not really help the shepherd syslog because guile's
> read-line blocks forever waiting for a terminating newline. Also guile
> is unaware that further attempts to read would EWOULDBLOCK as "(select
> (vector port) #() #() 0)" indicates that reading is possible but then
> actually trying to a get a char blocks.

Ah but I think that=E2=80=99s fine: shepherd, suspendable ports are enabled=
 (via
Fibers), which means that read attempts that return EAGAIN or
EWOULDBLOCK result in the calling fiber being suspended.

You would need to try this for real, but it should be fine.

Thanks!

Ludo=E2=80=99.
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

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From: yelninei@HIDDEN
To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
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Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
 #:kernel-log-file on the Hurd.
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Hi Ludo,

I found where the error gets set (debugging global variables is not fun)

As a reminder we get the D_WOULD_BLOCK error back from the initial=20

if(err)
=C2=A0 =C2=A0 return err;
check in dev_read.

In our case this comes from device_read_reply_inband from the errorcode par=
ameter. I am not yet sure where/how this gets called.

My little C example now returns EWOULDBLOCK when reaching the "end" of /dev=
/klog.

However this does not really help the shepherd syslog because guile's read-=
line blocks forever waiting for a terminating newline. Also guile is unawar=
e that further attempts to read would EWOULDBLOCK as "(select (vector port)=
 #() #() 0)" indicates that reading is possible but then actually trying to=
 a get a char blocks.
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

Message received at 77943 <at> debbugs.gnu.org:


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From: yelninei@HIDDEN
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Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
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Hello,


Jun 10, 2025, 12:55 by ludo@HIDDEN:

> Hi Yelninei,
>
> yelninei@HIDDEN writes:
>
>> I tried your patch that you sent to bug-hurd but I still end up with D_W=
OULD_BLOCK at the end. Was it working for you?
>>
>
> No no, it wasn=E2=80=99t, but I haven=E2=80=99t taken the time to dig fur=
ther.
>
>> As pointed out by Samuel on bug-hurd the initial "if (err) return err" l=
ooks weird. I tried removing it and at the end of /dev/klog it died with SI=
GLOST.
>>
>
> [...]
>
>> and my example now fails with EAGAIN.
>>
>
> I=E2=80=99m not sure what example but EAGAIN is fine, it=E2=80=99s what w=
e want.
>

The example is just some terrible C code that runs fgets in a loop.

When I try something similar with guile and (@ (ice-9 rdelim) read-line) it=
 seems to block forever at the "last" line.
=C2=A0From the C example that last line seems to be missing a terminating n=
ewline and I am thinking read-line cannot handle this situation when the de=
liminator is just EAGAIN so the port is never handed of to fibers (fport_re=
ad which was erroring before seems to return -1=C2=A0 in this case as a ssi=
ze_t cast to size_t which also seems wrong ).

Further investigation required.
> Thanks for investigating!
>
> Ludo=E2=80=99.
>
Yelninei
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: yelninei@HIDDEN
Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
 #:kernel-log-file on the Hurd.
In-Reply-To: <OSK14Qd--F-9@HIDDEN> (yelninei@HIDDEN's message of
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Hi Yelninei,

yelninei@HIDDEN writes:

> I tried your patch that you sent to bug-hurd but I still end up with D_WO=
ULD_BLOCK at the end. Was it working for you?

No no, it wasn=E2=80=99t, but I haven=E2=80=99t taken the time to dig furth=
er.

> As pointed out by Samuel on bug-hurd the initial "if (err) return err" lo=
oks weird. I tried removing it and at the end of /dev/klog it died with SIG=
LOST.

[...]

> and my example now fails with EAGAIN.

I=E2=80=99m not sure what example but EAGAIN is fine, it=E2=80=99s what we =
want.

Thanks for investigating!

Ludo=E2=80=99.
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

Message received at 77943 <at> debbugs.gnu.org:


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Date: Tue, 10 Jun 2025 11:50:27 +0200 (CEST)
From: yelninei@HIDDEN
To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
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References: <cover.1745163830.git.ludo@HIDDEN>
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 <OPRqyKU--F-9@HIDDEN> <87cybmp4q6.fsf@HIDDEN>
Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
 #:kernel-log-file on the Hurd.
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Hello Ludo,


Jun 2, 2025, 16:09 by ludo@HIDDEN:

> Hi,
>
> Right, I started looking into it back then but then didn=E2=80=99t take t=
he time
> to track it down.
>

I tried your patch that you sent to bug-hurd but I still end up with D_WOUL=
D_BLOCK at the end. Was it working for you?

As pointed out by Samuel on bug-hurd the initial "if (err) return err" look=
s weird. I tried removing it and at the end of /dev/klog it died with SIGLO=
ST.

I then tried this patch similar to yours to intercept D_WOULD_BLOCK at the =
beginning instead:

diff --git a/trans/streamio.c b/trans/streamio.c
index e42ff908..ee3cf9b4 100644
--- a/trans/streamio.c
+++ b/trans/streamio.c
@@ -1005,7 +1005,12 @@ dev_read (size_t amount, void **buf, size_t *len, in=
t nowait)
=C2=A0=C2=A0 size_t max, avail;
=C2=A0
=C2=A0=C2=A0 if (err)
-=C2=A0=C2=A0=C2=A0 return err;
+=C2=A0=C2=A0=C2=A0 {
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (err =3D=3D D_WOULD_BLOCK)
+=09=C2=A0 return EWOULDBLOCK;
+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else
+=09=C2=A0 return err;
+=C2=A0=C2=A0=C2=A0 }
=C2=A0
=C2=A0=C2=A0 while (!buffer_readable (input_buffer))
=C2=A0=C2=A0=C2=A0=C2=A0 {

and my example now fails with EAGAIN.

I am not sure yet what is setting this, the joy of global variables.

However something still seems wrong when I added back the shepherd syslog. =
It still crashes/hangs when it reaches the initial end of /dev/klog and doe=
s not process messages further:=20
there is an extra message and e.g. sshd messages to the syslog dont get pro=
cessed.

root@childhurd ~# ./main
irq handler [11]: new delivery port f5e44038 entry f4f39840

errno: Resource temporarily unavailable

To be continued.

Note: I had to add the patch to the default hurd and just patching the hurd=
 package that is used in operating-system-hurd was not enough. Dont know wh=
at is up with that.

> Thanks,
> Ludo=E2=80=99.
>
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

Message received at 77943 <at> debbugs.gnu.org:


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Date: Mon, 2 Jun 2025 22:02:01 +0200 (CEST)
From: yelninei@HIDDEN
To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
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Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
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Hello,

Jun 2, 2025, 16:09 by ludo@HIDDEN:

> The issue with=C2=A0ED_WOULD_BLOCK is still present on hurd-0.9.git202504=
20 on core-packages-team.=C2=A0
>
> Right, I started looking into it back then but then didn=E2=80=99t take t=
he time
> to track it down.
>
>> I tried it for a while with #:kernel-log-file set to #f and it felt
>> like it was slowing down shepherd significantly enough to be mildly
>> annoying but idk if this is something I only noticed because I was
>> actively looking for changes.
>>
>
> How did you notice that it was slowing down?  That was with 1.0.5,
> right?
>

I dont know if I am just imagining this but anything ssh related felt a bit=
 laggy but idk how the syslog should cause this except that sshd logs to sy=
slog and shepherd is also managing the sshd socket.

 Also things like herd status felt a lot slower.

But all of this was not really consistent and I dont know if I am just maki=
ng this up so this might be all wrong.
No this was all with 1.0.4, tested this on master around when you sent the =
initial version. And on core-packages-team shepherd is still 1.0.4.

> Thanks,
> Ludo=E2=80=99.
>
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: yelninei@HIDDEN
Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
 #:kernel-log-file on the Hurd.
In-Reply-To: <OPRqyKU--F-9@HIDDEN> (yelninei@HIDDEN's message of
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Hi,

yelninei@HIDDEN writes:

> Does it still make sense to duplicate the default kernel-log-file in guix=
 and shepherd now that 1.0.5 is available?

No, it=E2=80=99s no longer necessary.

> The issue with=C2=A0ED_WOULD_BLOCK is still present on hurd-0.9.git202504=
20 on core-packages-team.=C2=A0

Right, I started looking into it back then but then didn=E2=80=99t take the=
 time
to track it down.

> I tried it for a while with #:kernel-log-file set to #f and it felt
> like it was slowing down shepherd significantly enough to be mildly
> annoying but idk if this is something I only noticed because I was
> actively looking for changes.

How did you notice that it was slowing down?  That was with 1.0.5,
right?

Thanks,
Ludo=E2=80=99.
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

Message received at 77943 <at> debbugs.gnu.org:


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Date: Mon, 2 Jun 2025 16:35:42 +0200 (CEST)
From: yelninei@HIDDEN
To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
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Subject: Re: [PATCH 1/2] services: shepherd: Provide the right
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Hi Ludo,

I am a bit late to this:

Does it still make sense to duplicate the default kernel-log-file in guix a=
nd shepherd now that 1.0.5 is available?

The issue with=C2=A0ED_WOULD_BLOCK is still present on hurd-0.9.git20250420=
 on core-packages-team.=C2=A0
I tried it for a while with #:kernel-log-file set to #f and it felt like it=
 was slowing down shepherd significantly enough to be mildly annoying but i=
dk if this is something I only noticed because I was actively looking for c=
hanges.


Apr 20, 2025, 15:54 by ludo@HIDDEN:

> * gnu/services/shepherd.scm (shepherd-system-log-service-type):
> Pass #:kernel-log-file.
>
> Reported-by: Yelninei <yelninei@HIDDEN>
> Change-Id: I6f7a4b4e8e69a116069886e3879400d600645b30
> ---
> gnu/services/shepherd.scm | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
> index c8e01c9d83..156a36c2da 100644
> --- a/gnu/services/shepherd.scm
> +++ b/gnu/services/shepherd.scm
> @@ -781,6 +781,15 @@ (define shepherd-system-log-service-type
> (#f #~())
> (value #~(#:message-destination #$value)))
>
> +                               ;; The Shepherd <=3D 1.0.4 chooses /proc/=
kmsg
> +                               ;; unconditionally.  Fix that.
> +                               #:kernel-log-file
> +                               (cond ((string-contains %host-type "linux=
") ;Linux
> +                                      "/proc/kmsg")
> +                                     ((string-suffix? "-gnu" %host-type)=
 ;GNU/Hurd
> +                                      "/dev/klog")
> +                                     (else #f))
> +
> #:date-format #$date-format
> #:history-size #$history-size
> #:max-silent-time #$max-silent-time)))))
> --
> 2.49.0
>
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

Message received at 77943 <at> debbugs.gnu.org:


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From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>
To: 77943 <at> debbugs.gnu.org
Subject: [PATCH 2/2] =?UTF-8?q?system:=20hurd:=20Switch=20to=20the=20Sheph?=
 =?UTF-8?q?erd=E2=80=99s=20system=20log.?=
Date: Sun, 20 Apr 2025 17:54:47 +0200
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This is a followup to 8492a3c8962664db4bd0e7475f63be0ef59db87a.

* gnu/system/hurd.scm (%base-services/hurd): Replace
‘syslog-service-type’ by ‘shepherd-system-log-service-type’.

Change-Id: I3e12087a04f06210bd10b649b29fcf9949c5aa35
---
 gnu/system/hurd.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gnu/system/hurd.scm b/gnu/system/hurd.scm
index c9df366f24..96b6a9a290 100644
--- a/gnu/system/hurd.scm
+++ b/gnu/system/hurd.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2020-2024 Ludovic Courtès <ludo@HIDDEN>
+;;; Copyright © 2020-2025 Ludovic Courtès <ludo@HIDDEN>
 ;;; Copyright © 2020, 2023, 2024 Janneke Nieuwenhuizen <janneke@HIDDEN>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -100,7 +100,7 @@ (define %base-services/hurd
                          `(("/bin/sh" ,(file-append bash "/bin/sh"))
                            ("/usr/bin/env" ,(file-append coreutils
                                                          "/bin/env"))))
-                (service syslog-service-type))
+                (service shepherd-system-log-service-type))
           (map (lambda (n)
                  (service hurd-getty-service-type
                           (hurd-getty-configuration
-- 
2.49.0
Information forwarded to janneke@HIDDEN, guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

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From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>
To: 77943 <at> debbugs.gnu.org
Subject: [PATCH 1/2] services: shepherd: Provide the right #:kernel-log-file
 on the Hurd.
Date: Sun, 20 Apr 2025 17:54:46 +0200
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* gnu/services/shepherd.scm (shepherd-system-log-service-type):
Pass #:kernel-log-file.

Reported-by: Yelninei <yelninei@HIDDEN>
Change-Id: I6f7a4b4e8e69a116069886e3879400d600645b30
---
 gnu/services/shepherd.scm | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gnu/services/shepherd.scm b/gnu/services/shepherd.scm
index c8e01c9d83..156a36c2da 100644
--- a/gnu/services/shepherd.scm
+++ b/gnu/services/shepherd.scm
@@ -781,6 +781,15 @@ (define shepherd-system-log-service-type
                                     (#f #~())
                                     (value #~(#:message-destination #$value)))
 
+                               ;; The Shepherd <= 1.0.4 chooses /proc/kmsg
+                               ;; unconditionally.  Fix that.
+                               #:kernel-log-file
+                               (cond ((string-contains %host-type "linux") ;Linux
+                                      "/proc/kmsg")
+                                     ((string-suffix? "-gnu" %host-type) ;GNU/Hurd
+                                      "/dev/klog")
+                                     (else #f))
+
                                #:date-format #$date-format
                                #:history-size #$history-size
                                #:max-silent-time #$max-silent-time)))))
-- 
2.49.0
Information forwarded to guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.

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From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>
To: guix-patches@HIDDEN
Subject: [PATCH 0/2] Using the Shepherd's system log on the Hurd
Date: Sun, 20 Apr 2025 17:52:37 +0200
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Hello!

This changes the Hurd to use the Shepherd’s system log instead of
syslogd from Inetutils, as is already the case on Linux.  I wanted
to try now that Yelninei and I have addressed most of the issues
they reported in this area: <https://issues.guix.gnu.org/77634>.

It works, but maybe we should hold on a bit though, because of this:

--8<---------------cut here---------------start------------->8---
shepherd[1]: GNU Shepherd 1.0.4 (Guile 3.0.9, i586-pc-gnu)
shepherd[1]: Starting service root...
[…]
shepherd[1]: Service root-file-system running with value #t.
shepherd[1]: Service root-file-system has been started.
Uncaught exception in task:
In fibers.scm:
    172:8  7 (_)
In shepherd/service/system-log.scm:
    240:7  6 (run-system-log #<<channel> getq: #<atomic-box 33088d0?> ?)
In ice-9/suspendable-ports.scm:
   681:11  5 (read-delimited _ _ _)
    613:2  4 (read-char _)
   184:27  3 (fill-input #<input: /dev/klog 44> _ _)
     72:4  2 (read-bytes #<input: /dev/klog 44> #vu8(51 98 120 121 ?) ?)
In unknown file:
           1 (port-read #<input: /dev/klog 44> #vu8(51 98 120 121 ?) ?)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure fport_read: (os/device) operation would block
--8<---------------cut here---------------end--------------->8---

It’s non-fatal but I think everything going to /dev/log after that
is dismissed—IOW, the system log doesn’t log anything.  There’s also
the "\0" sender that appears in /var/log/messages: it works, but it’s
not nice.

I reported it on bug-hurd and hopefully it has an easy solution.

Ludovic Courtès (2):
  services: shepherd: Provide the right #:kernel-log-file on the Hurd.
  system: hurd: Switch to the Shepherd’s system log.

 gnu/services/shepherd.scm | 9 +++++++++
 gnu/system/hurd.scm       | 4 ++--
 2 files changed, 11 insertions(+), 2 deletions(-)


base-commit: d14663b94a7428eccbfa27aa620dc3d8ba67d752
-- 
2.49.0
Acknowledgement sent to Ludovic Courtès <ludo@HIDDEN>:
New bug report received and forwarded. Copy sent to janneke@HIDDEN, guix-patches@HIDDEN. Full text available.
Report forwarded to janneke@HIDDEN, guix-patches@HIDDEN:
bug#77943; Package guix-patches. Full text available.
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