I tried to create a new virtual machine with similar settings today and shutdown via Proxmox worked.
The older virtual machine (created on 16/08) has exactly the same package versions and running kernel and was unable to shutdown via Proxmox until I reboot it today. Very strange. So it seems that this may not be a issue with the kernel but with Proxmox. Journal from Proxmox host before VM reboot: Aug 22 16:33:10 sam qm[51346]: <root@pam> starting task UPID:sam:0000C894:0239A288:5F412CA6:qmshutdown:106:root@pam: Aug 22 16:33:10 sam qm[51348]: shutdown VM 106: UPID:sam:0000C894:0239A288:5F412CA6:qmshutdown:106:root@pam: Aug 22 16:34:00 sam systemd[1]: Starting Proxmox VE replication runner... -- Subject: A start job for unit pvesr.service has begun execution -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- A start job for unit pvesr.service has begun execution. -- -- The job identifier is 358778. Aug 22 16:34:01 sam systemd[1]: pvesr.service: Succeeded. -- Subject: Unit succeeded -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- The unit pvesr.service has successfully entered the 'dead' state. Aug 22 16:34:01 sam systemd[1]: Started Proxmox VE replication runner. -- Subject: A start job for unit pvesr.service has finished successfully -- Defined-By: systemd -- Support: https://www.debian.org/support -- -- A start job for unit pvesr.service has finished successfully. -- -- The job identifier is 358778. Aug 22 16:34:57 sam qm[51348]: VM 106 qmp command failed - received interrupt Aug 22 16:34:57 sam qm[51348]: VM quit/powerdown failed Aug 22 16:34:57 sam qm[51346]: <root@pam> end task UPID:sam:0000C894:0239A288:5F412CA6:qmshutdown:106:root@pam: VM quit/powerdown failed After VM manual reboot: Aug 22 16:36:27 sam sudo[54269]: pam_unix(sudo:session): session opened for user root by erdnaxe(uid=0) Aug 22 16:36:28 sam qm[54270]: <root@pam> starting task UPID:sam:0000D400:0239F00C:5F412D6C:qmshutdown:106:root@pam: Aug 22 16:36:28 sam qm[54272]: shutdown VM 106: UPID:sam:0000D400:0239F00C:5F412D6C:qmshutdown:106:root@pam: Aug 22 16:36:31 sam kernel: vmbr10: port 5(tap106i0) entered disabled state Aug 22 16:36:31 sam qm[54270]: <root@pam> end task UPID:sam:0000D400:0239F00C:5F412D6C:qmshutdown:106:root@pam: OK Aug 22 16:36:31 sam sudo[54269]: pam_unix(sudo:session): session closed for user root If the problem reappear I will try to collect more information to open an issue on Proxmox side or Debian side. Sorry for the inconvenience, -- Alexandre<mailto:erdn...@crans.org>