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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1841397
and then change the status of the bug to 'Confirmed'.
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the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1841397
Title:
Kernel BUG/Oops: tc qdisc delete with tc filter action xt -j CONNMARK
Status in linux package in Ubuntu:
Incomplete
Bug description:
Overview:
=========
Several uses of "tc filter .. action xt" work as expected and also
allow final qdisc/filter deletion: e.g. xt_DSCP and xt_CLASSIFY.
However, trying to delete a qdisc/filter using xt_CONNMARK results in
a kernel oops or hang/crash on all platforms and kernel versions
tested.
Steps to Reproduce:
===================
# tc qdisc add dev lo clsact
# tc filter add dev lo egress protocol ip matchall action xt -j CONNMARK
--save-mark
# tc qdisc del dev lo clsact
<Kernel Oops>
Systems Tested:
===============
Ubuntu 18.04 LTS (mainline kernel 5.2.6-050206-generic/x86_64, iptables
1.6.1, iproute2 4.15)
(Kernel build: https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.2.6/)
Ubuntu 18.04 LTS (distro kernel 4.15.0-58-generic/x86_64, iptables
1.6.1, iproute2 4.15)
External Tracking:
==================
This bug is also tracked upstream at
https://bugzilla.kernel.org/show_bug.cgi?id=204681, with logs.
There is also a proposed fix.
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