Public bug reported:
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
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1841397
Title:
Kernel BUG/Oops: tc qdisc delete with tc filter action xt -j CONNMARK
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