> was able to get "unregister_netdevice: waiting for lo to become free. Usage > count = 1" > in less than 5 minutes :-(
well, that's unfortunate that you still see it but fortunate that you're able to reproduce it quickly. The issue that I fixed - TCP kernel socket staying open - is certainly not the only way to encounter the problem. > Our environment spawns about 1 container a second that does either openvpn > (both udp and tcp) > or ipsec tunnel testing. That's good to know; my guess would be ipsec, but of course will require investigation. I'll try reproducing separately with openvpn and ipsec also. > PLease let me know how to enable the debug messages the previous builds did have some dbg messages, but I removed them for the last build, so I'll need to add dbg again and spin new kernel builds. I'll update this bug once dbg kernel(s) are ready. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. -- [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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
