Control: tags -1 + moreinfo On Fri, May 18, 2018 at 06:19:02PM +0200, Hans van Kranenburg wrote: > 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.
Is this still an issue? I notice that the upstream report did not got a reply. If it still an issue, please try to prod upstream again. Is it observable as well with recent kernels? If not I suggest to close the issue. Regards, Salvatore
