Hi Dan, so for the first kernel (linux- image-4.13.13-00940-gf16e2bbbddee_4.13.13-00940-gf16e2bbbddee- 24_amd64.deb), it failed after some 10 minutes. The outputs are:
Feb 13 22:35:54 prg41-004 kernel: [ 736.399342] unregister_netdevice: waiting for lo (netns ffff9adbfbebb000) to become free. Usage count = 1 Feb 13 22:35:54 prg41-004 kernel: [ 736.399376] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 And then: root@prg41-004:~# grep ffff9ae3fee51f00 /var/log/syslog Feb 13 22:33:33 prg41-004 kernel: [ 595.493003] dst_init: dst ffff9ae3fee51f00 refcnt 1 from __dst_alloc+0x7e/0x100 Feb 13 22:33:33 prg41-004 kernel: [ 595.493009] dst_hold: dst ffff9ae3fee51f00 refcnt 2 from rt_cache_route+0x54/0xe0 Feb 13 22:33:33 prg41-004 kernel: [ 595.648996] dst_hold_safe: dst ffff9ae3fee51f00 refcnt 3 from ip_route_output_key_hash_rcu+0x8a1/0xa20 Feb 13 22:33:33 prg41-004 kernel: [ 595.689067] dst_release_immediate: dst ffff9ae3fee51f00 refcnt 2 from free_fib_info_rcu+0x146/0x1c0 Feb 13 22:35:54 prg41-004 kernel: [ 736.399376] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:04 prg41-004 kernel: [ 746.447322] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:14 prg41-004 kernel: [ 756.527237] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:24 prg41-004 kernel: [ 766.639159] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:34 prg41-004 kernel: [ 776.815056] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:45 prg41-004 kernel: [ 786.958967] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 22:36:55 prg41-004 kernel: [ 797.070875] (netns ffff9adbfbebb000): dst ffff9ae3fee51f00 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 (and obviously more of such messages every 10 seconds) BTW from the timing it seems that the docker image who produced this error might be interrupted with timeout (normally, the dockers images we run on the machine live for few seconds only). Will post the second kernel soon. -- 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
