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

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

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

Message #8 received at 77115 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: 77115 <at> debbugs.gnu.org
Subject: Re: bug#77115: [shepherd] Attempt to suspend fiber within
 continuation barrier
Date: Thu, 20 Mar 2025 01:41:53 +0900

[Message part 1 (text/plain, inline)]

tag 77115 + important
quit

Hi,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:

> Hi,
>
> Seen on Berlin:
>
> $ sudo herd schedule mcron 1000 | grep mumi
> herd: error: exception caught while executing 'schedule' on service 'mcron':
> Attempt to suspend fiber within continuation barrier

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.

[Screenshot_guix-system-latest_2025-03-20_00:26:07.png (image/png, inline)]

[Message part 3 (text/plain, inline)]

-- 
Thanks,
Maxim

Message #11 received at 77115 <at> debbugs.gnu.org (full text, mbox):

From: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
To: 77115 <at> debbugs.gnu.org, GNU Debbugs <control <at> debbugs.gnu.org>
Subject: Re: bug#77115: [shepherd] Attempt to suspend fiber within
 continuation barrier
Date: Thu, 20 Mar 2025 01:42:06 +0900

[Message part 1 (text/plain, inline)]

tag 77115 + important
quit

Hi,

Maxim Cournoyer <maxim.cournoyer <at> gmail.com> writes:

> Hi,
>
> Seen on Berlin:
>
> $ sudo herd schedule mcron 1000 | grep mumi
> herd: error: exception caught while executing 'schedule' on service 'mcron':
> Attempt to suspend fiber within continuation barrier

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.

[Screenshot_guix-system-latest_2025-03-20_00:26:07.png (image/png, inline)]

[Message part 3 (text/plain, inline)]

-- 
Thanks,
Maxim

Message #14 received at 77115 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Maxim Cournoyer <maxim.cournoyer <at> gmail.com>
Cc: 77115 <at> debbugs.gnu.org
Subject: Re: bug#77115: [shepherd] Attempt to suspend fiber within
 continuation barrier
Date: Wed, 19 Mar 2025 19:13:13 +0100

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:

--8<---------------cut here---------------start------------->8---
$ sudo herd schedule mcron 20000|wc -l
60000
--8<---------------cut here---------------end--------------->8---

> 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.

Thanks,
Ludo’.

Message #21 received at 77115-done <at> debbugs.gnu.org (full text, mbox):

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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