Kernel 4.4.0-22 OOPSes when using xt_CHAOS from xtables-addons

[Andrew Ignatov]

After upgrading from Wily to Xenial, my server started being frequently rebooted by an HP iLO watchdog. I turned it off, and installed kdump tools, and managed to capture a kernel crashdump. Turned out to be a network-related OOPS, looks like a bug with xtables modules and kernel 4.4.0 (the issue doesn't seem to occur with 4.2.0).

crash tool outputs for two crashes (occured in series with 5-minute pause for server coldboot):
http://pastebin.com/BSyEmUyJ

corresponding kernel backtraces:
http://pastebin.com/BMmqzrVP
http://pastebin.com/xQRA2kGP

The offending iptables rule, now removed:

iptables -A INPUT -j CHAOS --tarpit

xtables-addons-dkms and xtables-addons-common version:

 Installed: 2.10-1build1
  Candidate: 2.10-1build1
  Version table:
 *** 2.10-1build1 500
        500 http://mirror.yandex.ru/ubuntu xenial/universe amd64 Packages
        100 /var/lib/dpkg/status

Kernel version 4.4.0-22-generic #39-Ubuntu SMP Thu May 5 16:53:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

I still have the dumps and can provide any additional information necessary. Also please let me know if this is a wrong place to report this problem.

[Oibaf (oibaf)]

Is this still an issue with a newer Ubuntu release?
If so let us know, eventually it should be reported upstream at: https://inai.de/projects/xtables-addons/

[Launchpad Janitor (janitor)]

[Expired for xtables-addons (Ubuntu) because there has been no activity for 60 days.]