An Ubuntu LTS server runs xen with dom0 and one virtual machine. The server is freezing permanently on a number of seemingly unrelated operations, such as:
- Creation of a new file system with mkfs.ext3 on a LVM device. (this is consistent).
- Restart of xend via /etc/init.d/xend restart
- apt-get dist-upgrade on configuration phase of some fairly innocent stuff.
Also, yesterday I noticed that virtualized imagine had lost time synch and complained about backwards clock in dmesg.
Unfortunately, I don't have the screen shots on what happens actually on the console of the server (it is co-located).
I want to blame ram, but do You have other suggestions?
UPDATE: After further investigation, it appears that all those actions only kill network. When I visited the server in data center and logged onto console, I wasn't able to reach my router/gateway. How bizare.