kernel crash at veth interface shutdown (net_carrier_off)

[Jérôme Petazzoni]

When destroying a veth interface when both members of the veth pair are up, a kernel bug is triggered.

How to reproduce:

ip link add type veth
ip link set veth0 up
ip link set veth1 up
ip link del veth0

I've uploaded the kernel log to https://gist.github.com/jpetazzo/6190928.

In some cases, it completely locks up the machine. For instance, when a LXC ocntainer is stopped, the bug happens, but the machine is then frozen (no console, no reply to ping). I've uploaded the corresponding kernel log to https://gist.github.com/jpetazzo/6190908.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.8.0-28-generic 3.8.0-28.41~precise1
ProcVersionSignature: Ubuntu 3.8.0-28.41~precise1-generic 3.8.13.5
Uname: Linux 3.8.0-28-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.3
Architecture: amd64
Date: Fri Aug 9 03:31:01 2013
MarkForUpload: True
ProcEnviron:
 SHELL=/bin/bash
 TERM=linux
 LANG=en_US.UTF-8
SourcePackage: linux-lts-raring
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.11 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc5-saucy/

[Jérôme Petazzoni (jerome-petazzoni)]

The sequence of ip link ...` commands does not provoke the bug with the 3.11.0 kernel that you indicated.

Tags and status updated as requested.

Thanks!

[penalvch (penalvch)]

Jérôme Petazzoni, thank you for reporting this bug to Ubuntu. linux-lts-raring reached EOL on August 2014.
See the following documents for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases
https://wiki.ubuntu.com/Kernel/LTSEnablementStack

If this is still reproducible in a supported release, please execute the following in a terminal:
apport-collect 1210373

Otherwise, please mark this as Invalid.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]