[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
*** This bug is a duplicate of bug 1181315 *** https://bugs.launchpad.net/bugs/1181315 Reported another bug ( bug 1181315) for the same issue with ubuntu-bug linux, and marking this as a duplicate of the new one. ** This bug has been marked a duplicate of bug 1181315 unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1179509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
** Description changed: When utah client is used to run floodlight smoke tests for saucy server images, the following error is reported. - May 13 03:51:09 utah-8671-saucy-server-i386 utah: .INFO:root:Creating controllers - May 13 03:51:09 utah-8671-saucy-server-i386 utah: INFO:root:Creating switches - May 13 03:51:09 utah-8671-saucy-server-i386 utah: INFO:root:Creating hosts (7 on each switch) - May 13 03:51:09 utah-8671-saucy-server-i386 utah: INFO:root:Creating links + May 13 03:51:09 utah-8671-saucy-server-i386 kernel: [ 154.327421] IPv6: ADDRCONF(NETDEV_UP): s1-eth1: link is not ready May 13 03:51:19 utah-8671-saucy-server-i386 kernel: [ 164.100031] unregister_netdevice: waiting for lo to become free. Usage count = 2 ... ... May 13 03:54:33 utah-8671-saucy-server-i386 kernel: [ 358.452029] unregister_netdevice: waiting for lo to become free. Usage count = 2 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636063] INFO: task mnexec:7033 blocked for more than 120 seconds. May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636071] echo 0 /proc/sys/kernel/hung_task_timeout_secs disables this message. May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636076] mnexec D 00f2 0 7033 6369 0x May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636081] de407f00 0082 dffe7c20 00f2 d1655300 0016eb12 c19cc3c0 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636086] 0023 c19cc3c0 dfbf23c0 dee42670 dfc56240 d1655300 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636089] ded99540 b7666550 d1655300 02d12067 c2c7edd8 d1655300 de407f14 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636092] Call Trace: May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636113] [c112e69a] ? handle_mm_fault+0x22a/0x310 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636126] [c160efc3] schedule_preempt_disabled+0x23/0x60 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636129] [c160d553] __mutex_lock_slowpath+0xb3/0x110 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636131] [c160d10c] mutex_lock+0x1c/0x30 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636144] [c1525944] copy_net_ns+0x54/0xd0 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636153] [c106ec81] create_new_namespaces+0xd1/0x150 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636156] [c106ee7e] unshare_nsproxy_namespaces+0x4e/0x90 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636164] [c1049697] sys_unshare+0x127/0x230 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636170] [c1612ba0] ? arch_prepare_kprobe_ftrace+0x20/0x20 May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636174] [c1616b4d] sysenter_do_call+0x12/0x28 ... This is observed to occur only when utah is used to run the floodlight smoke tests. Running the floodlight tests without utah does not cause this issue and using utah to run some other tests does not cause this issue either. - This is possibly a kernel issue but since I am not entirely sure, the - bug is reported against utah. Please reassign it to the kernel team with - more information if possible. + Noticed a similar bug 1021471, but this one is occurring in KVM using + libvirt. The issue is only with the saucy kernel version, 3.9.0-1 and does not occur with 3.9.0-0. The tests were tried with saucy server VMs on precise as well as saucy hosts and the results is the same. Steps to reproduce: 1. Install a default saucy server on a vm (either manually or preseeded default installation) with either i386 or amd64 image using KVM, libvirt - 2. Install utah client on the VM - (http://utah.readthedocs.org/en/latest/introduction.html#how-to-start-running-tests contains the information) + 2. Do the following to install utah inside the VM +sudo apt-add-repository -y ppa:utah/stable +sudo apt-get update +sudo apt-get install utah 3. Run the floodlight tests using sudo utah -r lp:ubuntu-test-cases/server/runlists/floodlight.run 4. Now kernel: [ 358.452029] unregister_netdevice: waiting for lo to become free. Usage count = 2 will be continuously reported Install and boot time syslogs are attached. The impacted jobs are, https://jenkins.qa.ubuntu.com/view/Saucy/view/Smoke%20Testing/job/saucy-server-amd64-smoke-floodlight/15/ - and + and https://jenkins.qa.ubuntu.com/view/Saucy/view/Smoke%20Testing/job/saucy-server-i386-smoke-floodlight/13/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when
[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
** No longer affects: utah -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1179509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
Could you please run apport-collect 1179509 from the system after this happens? This sounds like a regression - there was a similar bug around 3.5 or so, but that was fixed upstream. ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah To manage notifications about this bug go to: https://bugs.launchpad.net/utah/+bug/1179509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
** Attachment added: log.tar.gz https://bugs.launchpad.net/utah/+bug/1179509/+attachment/3675365/+files/log.tar.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah To manage notifications about this bug go to: https://bugs.launchpad.net/utah/+bug/1179509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1179509] Re: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah
Apologies that I am having to attach the logs as a single tar ball. apport-collect 1179509 doesn't seem to collect the relevant logs for me from the VM. (it simply asks for lp credentials and leaves me in my lp home page) ** Changed in: linux (Ubuntu) Status: Incomplete = Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179509 Title: 'unregister_netdevice: waiting for lo to become free. Usage count = 2' is reported and causing kernel hang when floodlight tests are run using utah To manage notifications about this bug go to: https://bugs.launchpad.net/utah/+bug/1179509/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
