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Bug#899044: Oops: 0000 [#1] SMP in skb_release_data, openvswitch related

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  Bug#899044: Oops: 0000 [#1] SMP in skb_release_data, openvswitch related Hans van Kranenburg <hans.van.kranenburg@mendix.com> - 2018-05-18 18:30 +0200

#61049 — Bug#899044: Oops: 0000 [#1] SMP in skb_release_data, openvswitch related

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Package: src:linux
Version: 4.9.88-1

Hi,

I'm observing the attached errors on machines that are Xen dom0 and
running the latest Debian Stretch 4.9 kernel as dom0 kernel. The errors
have been happening a few times in the last few weeks. It started after
upgrading them from Jessie and 3.16 kernel to Stretch with 4.9 kernel.

For networking between domUs and the outside world, we use openvswitch.

After such an error happens:
* The amount of "flows" in the kernel quickly raises to the limit,
10000, as seen in output of ovs-dpctl show.
* Network traffic that should flow through the openvswitch bridge starts
disappearing in a seemingly random way.
* The memory usage of the userspace ovs-vswitchd starts growing quickly.
* Many of the ovs commands, like to add or remove an interface or bridge
hang.

After a restart of the openvswitch-switch service, and fixing up a bunch
of configuration of connected interfaces, functionality is restored.

While most of the symptoms seem related to userspace openvswitch
processes, the cause of it all seems to be in the kernel, while the
userspace ovs-vswitchd process is receiving a network packet?

Sadly I do not know how to reproduce this, except for just waiting until
it happens again.

Please advice what else I could use to help resolving this issue.

Thanks,
Regards,
-- 
Hans van Kranenburg

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