It happened to me with kernel 4.9.2
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https://bugs.launchpad.net/bugs/1065434
Title:
"unregister_netdevice: waiting for lo to become free. Usage count = 1"
after LXC container
The bug is not fixed as of today with 3.13.0-77 kernel up to 4.2 kernels.
https://bugzilla.kernel.org/show_bug.cgi?id=81211
** Bug watch added: Linux Kernel Bug Tracker #81211
http://bugzilla.kernel.org/show_bug.cgi?id=81211
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This bug was fixed in the package linux - 3.5.0-21.32
---
linux (3.5.0-21.32) quantal-proposed; urgency=low
[ Luis Henriques ]
* Release Tracking Bug
- LP: #1088979
* SAUCE: i915_hsw: move i915_hsw_enabled symbol to intel_ips
- LP: #1087622
linux (3.5.0-20.31)
Also verified on Precise with the LTS quantal kernel: “linux-lts-
quantal” 3.5.0-20.31~precise1
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Title:
unregister_netdevice: waiting for lo to
Verified with Linux ubuntu 3.5.0-20-generic #31-Ubuntu
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
after LXC
I verified on Quantal with 3.5.0-20-generic #31-Ubuntu
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
after LXC
** Tags removed: verification-needed-quantal
** Tags added: verification-done-quantal
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Title:
unregister_netdevice: waiting for lo to become
This bug is awaiting verification that the kernel for Quantal in
-proposed solves the problem (3.5.0-20.31). Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-quantal' to 'verification-done-quantal'.
If verification is not
** Branch linked: lp:ubuntu/precise-proposed/linux-lts-quantal
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
The fix has been committed to http://kernel.ubuntu.com/git?p=ubuntu
/ubuntu-quantal.git;a=commit;h=6661571b3379ddb6587eb07b65dda75da7d008f5
and will appear in the next update. The fix just missed the previous
update cycle, hence the delay.
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I see 3.5.0-19.30 has been released for Quantal but grepping through the
changelog and the entire source tree indicates that the patch has not
been applied to that kernel. Am I incorrect?
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I installed kernel 3.5.0-18.29-lp1065434 and did the following tests:
- Ran the test case in the description
- Copied bigger files (up to 1.4G)
- Copied data from the host to the container and the container to the host
- Copied data from a network host to the container and the container to a
== SRU Justification ==
Copying a fairly large amount of data over the network inside a container
and then exiting the container can trigger a missing decrement in the per
cpu reference count on a network device. The result is the kernel error
message:
unregister_netdevice: waiting for lo to
** Also affects: linux (Ubuntu Quantal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Raring)
Importance: High
Assignee: Colin King (colin-king)
Status: Incomplete
** Changed in: linux (Ubuntu Quantal)
Status: New = Fix Committed
** Changed in:
** Information type changed from Public Security to Public
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
after
@Jean-Baptiste,
I think I've found the offending bug and upstream commit
3d861f661006606bf159fd6bd973e83dbf21d0f9 net: fix secpath kmemleak
fixes a reference counting issue that stops lo from becoming free.
I've build some test kernels, perhaps you could try the appropriate one
and let me know
** Information type changed from Public to Public Security
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
after
** Changed in: linux (Ubuntu)
Assignee: Stefan Bader (stefan-bader-canonical) = Colin King (colin-king)
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Title:
unregister_netdevice:
Sounds like I'm in the same boat. Exact same symptoms as above,
Running Ubuntu 12.10 fully updated.Making it very difficult to do
anything productive with juju / lxc containers.
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it appears that if I wait a minute or so between destroying a LXC and
creating the next one it seems to be okay ... so I'm guessing it takes
longer for a portion of the networking to be shut down and if you try
and start a new one it gets into a lock contention.
# juju destroy-service test
#
Hi, I do hit the exact same issue on my systems, its not ubuntu, but for
what's it worth I did tested the vanilla 3.5 and 3.6.3 kernel and the
bug is present there, maybe that can a bit help when you know that none
of the ubuntu's kernel patches have anything to do with the issue. I can
reproduce
** Changed in: linux (Ubuntu)
Importance: Medium = High
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
after
** Attachment added: kern.log.3.5.0-17-generic-#26+smb2
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1065434/+attachment/3394436/+files/kern.log.3.5.0-17-generic-%2326%2Bsmb2
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** Attachment added: syslog.3.5.0-17-generic-#26+smb2
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1065434/+attachment/3394438/+files/syslog.3.5.0-17-generic-%2326%2Bsmb2
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** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
** Changed in: linux (Ubuntu)
Assignee: (unassigned) = Stefan Bader (stefan-bader-canonical)
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** Description changed:
Reproduced with 3.5.0-17-generic #28-Ubuntu x86_64 on 2 different
systems
TEST CASE:
On a fresh installation of Quantal with all updates applied run:
On the host
1. sudo lxc-create -n test01 -t ubuntu -- -a amd64 -r quantal
2. sudo lxc-start -n test01
** Changed in: linux (Ubuntu)
Status: New = Confirmed
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Title:
unregister_netdevice: waiting for lo to become free. Usage count = 1
Logs with kernel 3.5.0-17-generic-#26+smb2
** Attachment added: dmesg.3.5.0-17-generic-#26+smb2
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1065434/+attachment/3394435/+files/dmesg.3.5.0-17-generic-%2326%2Bsmb2
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I did the following additional tests:
1) Download 1MB at 5kbps: PASS
2) Download 50MB at 100Mpbs: FAIL
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Title:
unregister_netdevice: waiting for
** Description changed:
Reproduced with 3.5.0-17-generic #28-Ubuntu x86_64 on 2 different
systems
TEST CASE:
On a fresh installation of Quantal with all updates applied run:
On the host
1. sudo lxc-create -n test01 -t ubuntu -- -a amd64 -r quantal
2. sudo lxc-start -n test01
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