** 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 000000f2 0 7033 6369 0x00000000
May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636081] de407f00
00000082 dffe7c20 000000f2 d1655300 0016eb12 00000000 c19cc3c0
May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636086] 00000000
00000023 c19cc3c0 dfbf23c0 dee42670 dfc56240 d1655300 00000000
May 13 03:54:35 utah-8671-saucy-server-i386 kernel: [ 360.636089] ded99540
00000000 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/
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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
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