Public bug reported:
Binary package hint: ufw
System where problem was experienced:
Package Version: ufw 0.16.2.4
Description: Ubuntu 8.04.4 LTS
Release: 8.04
Problem still exists in current karmic. Verified with
Package Version ufw: 0.29-4ubuntu1
Description: Ubuntu 9.10
Release: 9.10
Problem Description:
When purging ufw, a system using NFS for its root file-system and having
a firewall configuration with policy DROP hangs irrevocably. The reason
for this is the order the ufw.postrm script clears the firewall:
Step 1 - iptables -F
This removes all rules allowing network traffic to the NFS server, _the
server hangs_ trying to execute the next step because it can't read the
executable from the filesystem.
Step 2 - iptables -X
Step 3 - iptables -P INPUT ACCEPT
Step 4 - iptables -P OUTPUT ACCEPT
Step 5 - iptables -P FORWARD ACCEPT
Solution Suggestion:
Putting steps 3-5 _before_ steps 1-2 would completely solve this
problem.
** Affects: ufw (Ubuntu)
Importance: Undecided
Status: New
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Purging ufw causes system lockup with NFS-root
https://bugs.launchpad.net/bugs/524395
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