> The symptoms seen are a number of docker commands that just hang indefinitely > (e.g. > docker ps, spinning up new containers). Occasionally, after a long time, we > have > seen it come back and continue working OK (like whatever was holding the lock > released it finally), but most of the time it hangs indefinitely
ok, great. You didn't mention what release you're using on gcp, but I have a 4.13 test kernel in this ppa, with patches to specifically fix/workaround the hanging problem: https://launchpad.net/~ddstreet/+archive/ubuntu/lp1711407 Note that *only* version 4.13.0-38.43+hf1711407v20180413b1 in that ppa has the patches to workaround the hanging. If you need a different version, let me know and I can apply the patches and build for whatever release you need (just give me the 'uname -a' output). The details of the cause of this problem is back in comment 72, if you want that info. I'm preparing to send the workaround patch upstream; after that, there will be (likely ongoing) work to debug the various dst/object leaks and kernel socket "leaks" that are actually causing the symptoms. -- 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: Won't Fix 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 : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
