From: rschwarzkopf@mathematik.uni-marburg.de   
      
   This is a multi-part message in MIME format.   
   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   
      
      
      
        
      
          
        
        
       
Hi there,
   
       
after upgrading to the latest kernel on Debian 11 (linux-   
   mage-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.d   
   bian.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@mat   
   ematik.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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