Is there any update on this? I know there is a -w command in iptables
with this patch https://patchwork.ozlabs.org/patch/635676/. Is there a
way to call through ufw to set this option to increase the waits?

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https://bugs.launchpad.net/bugs/1204579

Title:
  ufw doesn't support concurrent updates

Status in ufw:
  In Progress
Status in ufw package in Ubuntu:
  Triaged
Status in ufw package in Debian:
  New

Bug description:
  On a server under Ubuntu 12.04 I automatically update firewall rules and I 
unfortunately noticed that if 2 rules are processed at the same time it leads 
to an inconsistent result between iptables and ufw status.
  In fact it can be reproduced using the python script in attachment.

  Before executing this script I didn't have any rules matching the ip 
192.168.254.1 on my computer.
  After a launch iptables takes into acount 464 rules.

  sudo iptables -L -n | grep 192.168.254.1 | wc -l
  464

  It should be 500 rules but the script stressed a lot my system and all rules 
can't be processed by iptables
  sudo ./test_ufw_threads.py
  iptables: Resource temporarily unavailable.

  iptables: Resource temporarily unavailable.

  iptables: Resource temporarily unavailable.
  [...]

  Anyway, ufw stores only the last updates (in /lib/ufw/user.rules):

  sudo ufw status
  √Čtat : actif

  Vers Action Depuis
  ---- ------ ------
  192.168.254.1 1234/tcp     ALLOW       192.168.46.9
  192.168.254.1 1234/tcp     ALLOW       192.168.22.10
  192.168.254.1 1234/tcp     ALLOW       192.168.32.10
  192.168.254.1 1234/tcp     ALLOW       192.168.5.10
  192.168.254.1 1234/tcp     ALLOW       192.168.43.9
  192.168.254.1 1234/tcp     ALLOW       192.168.40.10
  192.168.254.1 1234/tcp     ALLOW       192.168.46.10
  192.168.254.1 1234/tcp     ALLOW       192.168.48.10
  192.168.254.1 1234/tcp     ALLOW       192.168.42.10
  192.168.254.1 1234/tcp     ALLOW       192.168.43.10

  So I can't delete other rules using ufw, I had to directly use iptables.
  In this case I can only delete 10 rules using ufw.
  Could you please handle some kind of lock?

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