XPost: linux.debian.bugs.dist   
   From: ben@decadent.org.uk   
      
   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    
   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    
   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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