I have a Ubuntu 12.04.4 64bit installation (running as an OpenVZ container) that was running fairly well until I changed the hostname.
The change was made just by modifying
/etc/hosts, and restarting the network. After that, load avg increased a lot (normally was 0.3 and now stays constantly at 2.5)
If I use some tool like
top the only process that I can see with some cpu usage is
init (always between 10 and 15 percent).
I tried to strace init to try to get some clue, but I always get the same error:
Could not attach to process. If your uid matches the uid of the target process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
and I cant change that key also.
I cant find anything in syslog so I am completely clueless here. Has anyone faced a similar situation or has any tips on how to debug this problem? If really needed, a restart can be performed but I would prefer to not do that.