Ubuntu
linux package

pmtu.sh fails on 4.18 kernel

Bug #1789436 reported by Thadeu Lima de Souza Cascardo
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Fix Released
Medium
Thadeu Lima de Souza Cascardo
Cosmic
Fix Released
Medium
Thadeu Lima de Souza Cascardo

Bug Description

pmtu.sh is a network selftest that was introduced on 4.17. It is currently failing on 4.18. After revert of ccd740cbc6 "vti6: Add pmtu handling to vti6_xmit.", it passes.

The fail is in the nature of holding netdevices refcounts, so some network operations start hanging, including the loading and removal of network modules.

[ 159.936543] unregister_netdevice: waiting for veth_b to become free. Usage count = 1

Thadeu Lima de Souza Cascardo (cascardo)
Changed in linux (Ubuntu Cosmic):
assignee: nobody → Thadeu Lima de Souza Cascardo (cascardo)
importance: Undecided → Medium
status: New → Triaged
Revision history for this message
Seth Forshee (sforshee) wrote :

Pushed a revert of d6990976af7c "vti6: fix PMTU caching and reporting on xmit" to fix this temporarily until we have a proper fix.

Changed in linux (Ubuntu Cosmic):
status: Triaged → Fix Committed
Revision history for this message
Thadeu Lima de Souza Cascardo (cascardo) wrote :

Submitted proper fix upstream. Waiting for reviews.

http://patchwork.ozlabs.org/project/netdev/list/?series=63268

Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package linux - 4.18.0-7.8

---------------
linux (4.18.0-7.8) cosmic; urgency=medium

  * linux: 4.18.0-7.8 -proposed tracker (LP: #1789459)

  * pmtu.sh fails on 4.18 kernel (LP: #1789436)
    - SAUCE: Revert "vti6: fix PMTU caching and reporting on xmit"

 -- Seth Forshee <email address hidden> Tue, 28 Aug 2018 11:08:51 -0500

Changed in linux (Ubuntu Cosmic):
status: Fix Committed → Fix Released
Revision history for this message
Brad Figg (brad-figg) wrote :

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-bionic
Andy Whitcroft (apw)
tags: added: kernel-fixup-verification-needed-bionic
removed: verification-needed-bionic
Revision history for this message
Andy Whitcroft (apw) wrote :

This bug was erroneously marked for verification in bionic; verification is not required and verification-needed-bionic is being removed.

tags: added: verification-done-bionic
Brad Figg (brad-figg)
tags: added: cscc
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