Hi again, so for the second kernel (), was able to reproduce it in ~same time. The messages are:
Feb 13 23:04:23 prg41-004 kernel: [ 650.285711] unregister_netdevice: waiting for lo (netns ffff943cfe8ce000) to become free. Usage count = 1 Feb 13 23:04:23 prg41-004 kernel: [ 650.285736] (netns ffff943cfe8ce000): dst ffff943d18ac4200 expires 0 error 0 obsolete 2 flags 0 refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator ip_route_output_key_hash_rcu+0x355/0xa20 root@prg41-004:~# grep ffff943d18ac4200 /var/log/syslog Feb 13 23:02:14 prg41-004 kernel: [ 521.458077] dst_init: dst ffff943d18ac4200 refcnt 1 from __dst_alloc+0x7e/0x100 Feb 13 23:02:14 prg41-004 kernel: [ 521.458085] dst_hold: dst ffff943d18ac4200 refcnt 2 from rt_cache_route+0x54/0xe0 Feb 13 23:02:14 prg41-004 kernel: [ 521.634088] dst_hold_safe: dst ffff943d18ac4200 refcnt 3 from ip_route_output_key_hash_rcu+0x8a1/0xa20 Feb 13 23:02:14 prg41-004 kernel: [ 521.778104] dst_release_immediate: dst ffff943d18ac4200 refcnt 2 from free_fib_info_rcu+0x146/0x1c0 Feb 13 23:04:23 prg41-004 kernel: [ 650.285736] (netns ffff943cfe8ce000): dst ffff943d18ac4200 expires 0 error 0 obsolete 2 flags 0 refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator ip_route_output_key_hash_rcu+0x355/0xa20 Feb 13 23:04:33 prg41-004 kernel: [ 660.525715] (netns ffff943cfe8ce000): dst ffff943d18ac4200 expires 0 error 0 obsolete 2 flags 0 refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator ip_route_output_key_hash_rcu+0x355/0xa20 Feb 13 23:04:43 prg41-004 kernel: [ 670.669641] (netns ffff943cfe8ce000): dst ffff943d18ac4200 expires 0 error 0 obsolete 2 flags 0 refcnt 2 ops ipv4_dst_ops+0x0/0xc0 creator ip_route_output_key_hash_rcu+0x355/0xa20 etc. I hope it helps! Regards Jirka H. -- 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
