netdev - Fw: [Bug 204681] New: Kernel BUG/Oops: tc qdisc delete with tc filter action xt -j CONNMARK

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Date:   Sat, 24 Aug 2019 07:57:26 -0400
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     netdev@...r.kernel.org
Subject: Fw: [Bug 204681] New: Kernel BUG/Oops:  tc qdisc delete with tc
 filter action xt -j CONNMARK



Begin forwarded message:

Date: Fri, 23 Aug 2019 23:44:26 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: stephen@...workplumber.org
Subject: [Bug 204681] New: Kernel BUG/Oops:  tc qdisc delete with tc filter action xt -j CONNMARK


https://bugzilla.kernel.org/show_bug.cgi?id=204681

            Bug ID: 204681
           Summary: Kernel BUG/Oops:  tc qdisc delete with tc filter
                    action xt -j CONNMARK
           Product: Networking
           Version: 2.5
    Kernel Version: 5.2.6 (x86_64) / 4.19.62 (mips32)/ 4.14.133 (arm7l)
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Other
          Assignee: stephen@...workplumber.org
          Reporter: itugrok@...oo.com
        Regression: No

Created attachment 284581
  --> https://bugzilla.kernel.org/attachment.cgi?id=284581&action=edit  
BUG/Oops: kernel 5.2.6/x86_64

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/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/x86_64, iptables 1.6.1, iproute2 4.15)

OpenWrt master, r10666-fc5d46dc62 (kernel 4.19.62, mips32_be, iptables 1.8.3,
iproute2 5.0.0)

OpenWrt 19.07, r10324-8bf8de95a2 (kernel 4.14.133, armv7l, iptables 1.8.3,
iproute2 5.0.0)


Kernel Logs:
============

The clearest call traces are from the Ubuntu systems, and are attached.

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