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 <seth.fors...@canonical.com> Tue, 28 Aug 2018 11:08:51
-0500
** Changed in: linux (Ubuntu Cosmic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1789436
Title:
pmtu.sh fails on 4.18 kernel
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Cosmic:
Fix Released
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
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