GNU bug report logs - #77115
[shepherd] Attempt to suspend fiber within continuation barrier

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#77115: closed ([shepherd] Attempt to suspend fiber within
 continuation barrier)
Date: Thu, 10 Apr 2025 14:26:02 +0000

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Your message dated Thu, 10 Apr 2025 23:24:50 +0900
with message-id <87zfgoxff1.fsf <at> gmail.com>
and subject line Re: bug#77115: [shepherd] Attempt to suspend fiber within continuation barrier
has caused the debbugs.gnu.org bug report #77115,
regarding [shepherd] Attempt to suspend fiber within continuation barrier
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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77115: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=77115
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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: bug-guix <bug-guix <at> gnu.org>
Subject: [shepherd] Attempt to suspend fiber within continuation barrier
Date: Wed, 19 Mar 2025 20:52:21 +0900

Hi,

Seen on Berlin:

--8<---------------cut here---------------start------------->8---
$ sudo herd schedule mcron 1000 | grep mumi
herd: error: exception caught while executing 'schedule' on service 'mcron':
Attempt to suspend fiber within continuation barrier
--8<---------------cut here---------------end--------------->8---

-- 
Thanks,
Maxim

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From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 77115-done <at> debbugs.gnu.org
Subject: Re: bug#77115: [shepherd] Attempt to suspend fiber within
 continuation barrier
Date: Thu, 10 Apr 2025 23:24:50 +0900

Hi Ludovic,

Ludovic Courtès <ludo <at> gnu.org> writes:

> Hi,
>
> Maxim Cournoyer <maxim.cournoyer <at> gmail.com> skribis:
>
>> $ sudo herd schedule mcron 1000 | grep mumi
>> herd: error: exception caught while executing 'schedule' on service 'mcron':
>> Attempt to suspend fiber within continuation barrier
>
> (For the record, that’s Shepherd 1.0.1 currently running on berlin.)
>
> Can you reproduce it in a VM?  With 1.0.2 vs. 1.0.3?
>
> On my laptop, which runs 1.0.3ish, I can’t seem to hit this:
>
> $ sudo herd schedule mcron 20000|wc -l
> 60000
>
>> Another data point; when using virt-manager (which uses libvirt+qemu) to
>> run my own operating system definition, it triggers a similar hang/crash
>> in Shepherd during the boot; see the screenshot below.  I haven't yet
>> isolated which service causes it.
>
> Do you have a reproducer for this one?
>
> This looks a lot like what was fixed by
> <https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=f1a82845eaf8851af9a811e5a1d185b68b1c363f>,
> which is in 1.0.3.

I stopped being able to reproduce it after some time, probably following
a reconfigure/reboot.

Closing, thanks for the follow-up on all things Shepherds!

-- 
Thanks,
Maxim

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