GNU bug report logs - #77390
[Shepherd] Timer spawns many commands on DST change (CET -> CEST)

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: "Timo Wilken" <guix@HIDDEN>
Subject: Re: bug#77390: Shepherd: bug in timer scheduling on daylight
 savings time change
In-Reply-To: <D8TVBYDNEVB3.2M6JZ0D96HFML@HIDDEN> (Timo Wilken's message
 of "Sun, 30 Mar 2025 22:04:07 +0200")
References: <D8TVBYDNEVB3.2M6JZ0D96HFML@HIDDEN>
Date: Mon, 31 Mar 2025 15:17:00 +0200
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Hi Timo,

"Timo Wilken" <guix@HIDDEN> skribis:

> Last night, this hit the exact moment of the CET/CEST change and seems to=
 have
> confused the Shepherd a lot, to the point where it kept spamming the same
> message to /var/log/messages, and used up 80% of my system's total memory,
> according to htop. (This led to various things getting oom-killed, and the
> system grinding to a halt until I had a look at it in the afternoon.)
>
> First, at 01:00, the Shepherd spawned about 30 processes for this one tim=
er:
>
> --8<---------------cut here
> 2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned proces=
s 1691.
> 2025-03-30 01:00:00 localhost shepherd[1]: Timer 'nextcloud-cron' spawned=
 process 1692.
> 2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for nex=
tcloud-cron.
> 2025-03-30 01:00:00 localhost shepherd[1]: Timer 'gpsplot' spawned proces=
s 1693.
> 2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for gps=
plot.
> 2025-03-30 01:00:00 localhost shepherd[1]: Timer 'dynamic-dns-ipv4.api.my=
thic-beasts.com' spawned process 1694.
> 2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for dyn=
amic-dns-ipv4.api.mythic-beasts.com.
> 2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned proces=
s 1698.
> 2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for gui=
x-gc.

I saw the exact same problem on berlin (aka. ci.guix.gnu.org):

  https://issues.guix.gnu.org/77401

but not on the other servers I co-administer; I suspect the difference
is that these other servers did not have a timer running at 01:00.

So I guess that the fix for <https://issues.guix.gnu.org/75622> was
bogus somehow?

To be continued=E2=80=A6

Ludo=E2=80=99.

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Date: Sun, 30 Mar 2025 22:04:07 +0200
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Subject: Shepherd: bug in timer scheduling on daylight savings time change
From: "Timo Wilken" <guix@HIDDEN>
To: <bug-guix@HIDDEN>
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Hi,

Last night, my server's time changed from CET to CEST automatically, as it =
is
set to Europe/Berlin time.

I have a Shepherd timer set to run every night at 02:00 local time:
https://cgit.twilken.net/dotfiles/tree/tw/system.scm?h=3Dcd39f5d3340c0bcd59=
bb80d3ff4f12741db75e07#n136

--8<---------------cut here
   (simple-service 'disk-maintenance shepherd-root-service-type
     (list (shepherd-service
            (provision '(guix-gc))
            (requirement '(user-processes file-systems))
            (documentation "Delete unused files from Guix' store.")
            (modules '((shepherd service timer)))
            (start #~(make-timer-constructor
                      (calendar-event #:hours '(2) #:minutes '(0))
                      (command (list "guix" "gc" "-d" "2w"))))
            (stop #~(make-timer-destructor))
            (actions (list (shepherd-action
                            (name 'trigger) (procedure #~trigger-timer)
                            (documentation "Collect garbage now.")))))))
--8<---------------cut here

Last night, this hit the exact moment of the CET/CEST change and seems to h=
ave
confused the Shepherd a lot, to the point where it kept spamming the same
message to /var/log/messages, and used up 80% of my system's total memory,
according to htop. (This led to various things getting oom-killed, and the
system grinding to a halt until I had a look at it in the afternoon.)

First, at 01:00, the Shepherd spawned about 30 processes for this one timer=
:

--8<---------------cut here
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1691.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'nextcloud-cron' spawned p=
rocess 1692.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for nextc=
loud-cron.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'gpsplot' spawned process =
1693.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for gpspl=
ot.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'dynamic-dns-ipv4.api.myth=
ic-beasts.com' spawned process 1694.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for dynam=
ic-dns-ipv4.api.mythic-beasts.com.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1698.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1703.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1713.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1715.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1723.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1726.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1732.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1736.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1740.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1750.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1754.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1761.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1766.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1768.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1778.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1785.
2025-03-30 01:00:00 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:00 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1791.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1806.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1811.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1818.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1822.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1829.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1838.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1848.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1851.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1862.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1872.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1876.
2025-03-30 01:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 01:00:02 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1883.
2025-03-30 01:00:02 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 03:00:00 localhost linux: [46479.948177] perf: interrupt took to=
o long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 79750
2025-03-30 03:00:01 localhost linux: [47490.137060] perf: interrupt took to=
o long (3138 > 3130), lowering kernel.perf_event_max_sample_rate to 63500
2025-03-30 03:00:01 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1887.
2025-03-30 03:00:01 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 03:00:02 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1896.
2025-03-30 03:00:02 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 03:00:03 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1910.
2025-03-30 03:00:03 localhost shepherd[1]: Registering new logger for guix-=
gc.
2025-03-30 03:00:03 localhost shepherd[1]: Timer 'guix-gc' spawned process =
1915.
--8<---------------cut here

I then get 731(!!) lines like the following over the course of 3 seconds:

--8<---------------cut here
2025-03-30 03:00:03 localhost shepherd[1]: Waiting anew for timer 'guix-gc'=
 (resuming from sleep state?).
[...]
2025-03-30 03:00:06 localhost shepherd[1]: Waiting anew for timer 'guix-gc'=
 (resuming from sleep state?).
--8<---------------cut here

The Shepherd then gets more confused and starts spamming the same message o=
ver
and over again, but now without newlines, leading to lines like:

--8<---------------cut here
2025-03-30 03:00:06 localhost shepherd[1]: Waiting anew for timer 'guix-gc'=
 (resuming from sleep state?).Waiting anew for timer 'guix-gc' (resuming fr=
om sleep state?).Waiting anew for timer 'guix-gc' (resuming from sleep stat=
e?).Waiting anew for timer 'guix-gc' (resuming from sleep state?).Waiting a=
new for timer 'guix-gc' (resuming from sleep state?).Waiting anew for timer=
 'guix-gc' (resuming from sleep state?).Waiting anew for timer 'guix-gc' (r=
esuming from sleep state?).Waiting anew for timer 'guix-gc' (resuming from =
sleep state?).Waiting anew for
2025-03-30 03:00:06 localhost shepherd[1]:  timer 'guix-gc' (resuming from =
sleep state?).Waiting anew for timer 'guix-gc' (resuming from sleep state?)=
.Waiting anew for timer 'guix-gc' (resuming from sleep state?).Waiting anew=
 for timer 'guix-gc' (resuming from sleep state?).Waiting anew for timer 'g=
uix-gc' (resuming from sleep state?).Waiting anew for timer 'guix-gc' (resu=
ming from sleep state?).Waiting anew for timer 'guix-gc' (resuming from sle=
ep state?).Waiting anew for timer 'guix-gc' (resuming from sleep state?).Wa=
iting anew for timer 'guix-gc'
--8<---------------cut here

Then there's some output from the various "guix gc" processes spawned by th=
e
timer, which of course all step on each other's toes. The Shepherd keeps
happily writing the above lines out in large blocks.

It goes on like this until the afternoon, when the OOM kills start (probabl=
y
when I start SSH'ing in to see what's going on):

--8<---------------cut here
2025-03-30 15:21:44 localhost linux: [93869.155828] sshd-session invoked oo=
m-killer: gfp_mask=3D0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=3D0, =
oom_score_adj=3D0
--8<---------------cut here

After a bit of that, I decide to reboot the machine.

I've saved the system logs from that night - let me know if you need more d=
etails.

I'm running Shepherd 1.0.3, as packaged in Guix:

--8<---------------cut here
Generation 235	Mar 29 2025 12:07:15	(current)
  file name: /var/guix/profiles/system-235-link
  canonical file name: /gnu/store/p7infvmm678nysvdg3xvxlr83xxkj66j-system
  label: GNU with Linux-Libre 6.13.8
  bootloader: grub-efi
  root device: UUID: c63af3e6-3c2b-43d2-b1e6-944f09a10e0f
  kernel: /gnu/store/d7z9027yrs1vfmpvds10iqfl69cyvixn-linux-libre-6.13.8/bz=
Image
  channels:
    tw:
      repository URL: https://git.twilken.net/dotfiles
      branch: master
      commit: 39abf96d68ce500abbd55f9bdbd68e1c63282d36
    guix:
      repository URL: https://git.savannah.gnu.org/git/guix.git
      branch: master
      commit: 67f4a2feadbb6cc04a61b5a3bc7b8f4bace2a0bb
    [non-free channels omitted]
--8<---------------cut here

Cheers,
Timo