I upgraded my kernel (Debian) from 2.6.8 to 2.6.18 today. Everything went smoothly, and appeared operational. However, Zimbra wouldn't start properly, and if I tried a zmcontrol stop it would freeze when trying to execute /opt/zimbra/bin/postfix stop. Not only would the process seemingly freeze...my ssh session would freeze as well.
I even tried to reinstall via an upgrade, to no avail. Same problem.
Dropped back to 2.6.8 again, and everything is good.
Anyone know what might have been happening here? Has anyone has this experience?