Last Updated on 2014-05-24.
Problem / Scenario
Backup Software like Acronis Backup & Recovery causes your Hyper-V Virtual Machines to freeze. Guest OS is Ubuntu.
Sometimes this also happens when you restart your Hyper-V host or make a snapshot of your VM.
The VM itself displays error messages like “BUG: scheduling while atomic”.
Solution
The error message led me to this site, where it is mentioned that the error should have been fixed for about over a year now. I also tried to add the -Proposed entry in sources.list, but it did not help.
I upgraded to the latest Ubuntu Server version (14.04 LTS at the moment), but it did not help.
The final problem was I always left the Ubuntu default wizard setting by default (keep current file) when it asks for the boot / grub settings (menu.1st). So the system kept booting from an older kernel. In my case it was a 3.0 kernel, but in the meantime there exists version 3.13.
Additionally, as far as I know, Ubuntu will not always upgrade to the latest kernel itself by doing a distro upgrade.
Steps I did to solve the problem:
- For safety reasons: VM snapshot or VHD copy
- apt-get install linux-image-generic
- apt-get autoremove
- After the first or second step the wizard should ask you whether you want to keep your boot menu file. Choose the first option here (use a “new” one from the distributor).
- Reboot and check the current kernel version (in the login info message or type uname -r).