Hi Dan,
the test kernel you were using had this one [1] included? It's upstream
commit f186ce61bb82 ("Fix an intermittent pr_emerg warning about lo
becoming free."). Meaning, it's a rather a dst leak somewhere in latest
upstream as well?
Thanks,
Daniel
[1] https://patchwork.ozlabs.org/patch/773480/
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https://bugs.launchpad.net/bugs/1711407
Title:
unregister_netdevice: waiting for lo to become free
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Trusty:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Zesty:
In Progress
Status in linux source package in Artful:
In Progress
Status in linux source package in Bionic:
In Progress
Bug description:
This is a "continuation" of bug 1403152, as that bug has been marked
"fix released" and recent reports of failure may (or may not) be a new
bug. Any further reports of the problem should please be reported
here instead of that bug.
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[Impact]
When shutting down and starting containers the container network
namespace may experience a dst reference counting leak which results
in this message repeated in the logs:
unregister_netdevice: waiting for lo to become free. Usage count =
1
This can cause issues when trying to create net network namespace and
thus block a user from creating new containers.
[Test Case]
See comment 16, reproducer provided at https://github.com/fho/docker-
samba-loop
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