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Bug#1124549: [5.10] Libvirt can no longer delete macvtap devices after kernel update (Debian 11)

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Package: src:linux
Version: 5.10.247-1
Severity: important

Opening a bug report for this thread on the debian-kernel list.

Ben.

-------- Forwarded Message --------
From: Roland Schwarzkopf <rschwarzkopf@mathematik.uni-marburg.de>
To: debian-kernel@lists.debian.org
Subject: Libvirt can no longer delete macvtap devices after kernel update (Debian 11)
Date: 17/12/25 13:35:54
Message-Id: <0b06eb09-b1a9-41f9-8655-67397be72b22@mathematik.uni-marburg.de>

 
 
Hi there,
 
after upgrading to the latest kernel on Debian 11 (linux-image-5.10.0-
37-amd64) I have an issue using libvirt with qemu/kvm virtual machines
and macvtap networking. When a machine is shut down, libvirt can not
delete the corresponding macvtap device. Thus, starting the machine
again is not possible. After manually removing the macvtap device using
`ip link delete` the vm can be started again.
 
In the journal the following message is shown:
 
Dec 17 13:19:27 iblis libvirtd[535]: error destroying network device macvtap0: Operation not supported
 
After downgrading the kernel to linux-image-5.10.0-36-amd64, the problem
disappears. I tested this on a fresh minimal install of Debian 11 - to
exclude that anything else on my production machines is causing this
issue.
 
Since the older kernel does not have this issue, I assume this is
related to the kernel and not to libvirt?
 
I tried to check for bug reports of the kernel package, but the bug
tracker finds no reports and even states that the package does not exist
(I used the "Bug reports" link on
https://packages.debian.org/bullseye/linux-image-5.10.0-37-amd64). This
left me a bit puzzled. Since I don't have experience with the debian bug
reporting process, I had no other idea than writing to this list.
 
Best regards,
 
Roland Schwarzkopf
 
 
-- 
Dr. Roland Schwarzkopf <rschwarzkopf@mathematik.uni-marburg.de>
Dept. of Mathematics and Computer Science, IT Solutions
University of Marburg, Hans-Meerwein-Str. 6, D-35032 Marburg, Germany
Tel: +4964212821523, Fax: +4964212821573
 

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Bug#1124549: [5.10] Libvirt can no longer delete macvtap devices after kernel update (Debian 11) Ben Hutchings <ben@decadent.org.uk> - 2026-01-02 21:00 +0100

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