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Message #129912
[Bug 1475434] Re: ipvlan module causes kernel crashes (backport fixes from upstream)
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-vivid
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https://bugs.launchpad.net/bugs/1475434
Title:
ipvlan module causes kernel crashes (backport fixes from upstream)
Status in linux package in Ubuntu:
Invalid
Status in linux-lts-vivid package in Ubuntu:
Invalid
Status in linux-lts-vivid source package in Trusty:
Triaged
Status in linux source package in Vivid:
Fix Committed
Bug description:
SRU Justification:
[Impact]
ipvlan is currently unusable as removing an interface with an IP
address attached will cause a kernel crash.
[Test Case]
As reported in this bug, doing the following will result in a kernel
crash:
ip netns add ns0
ip link add link eth0 ipvl0 type ipvlan mode L3
ip link set dev ipvl0 netns ns0
ip netns exec ns0 bash
ip link set dev ipvl0 up
ip -4 addr add 192.168.0.10/24 dev ipvl0
ip link del dev ipvl0
[Fix]
commit 27705f7085ce2e124fac4c280ce824962cc90bb6
Author: Jiri Benc <jbenc@xxxxxxxxxx>
Date: Sat Mar 28 19:13:22 2015 +0100
ipvlan: fix addr hash list corruption
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Kernel version 3.19, currently being used as the vivid LTS kernel,
includes support for ipvlan. But at its current state it is unusable
as simply removing an interface with an ip address attached will cause
a kernel crash. The fix is already upstream:
https://github.com/torvalds/linux/commit/27705f7085ce2e124fac4c280ce824962cc90bb6
Reproducing this is easy (requires a recent version of iproute2, with
support for ipvlan, such as the one in debian/experimental):
ip netns add ns0
ip link add link eth0 ipvl0 type ipvlan mode L3
ip link set dev ipvl0 netns ns0
ip netns exec ns0 bash
ip link set dev ipvl0 up
ip -4 addr add 192.168.0.10/24 dev ipvl0
ip link del dev ipvl0
The last line will cause a kernel crash, with a calltrace that looks
like this:
https://gist.github.com/fabiokung/b360cb2f3bdf2fb36c8b
Can we get the fixes backported to the 3.19 LTS kernel from vivid?
Ideally we would like to have the whole patchset backported:
https://github.com/torvalds/linux/commit/d91e9015c78af1dc1f8ac4fdcf6118dbc2401668
and
https://github.com/torvalds/linux/commit/8172ba51e257fdd353010cd7caaa37c8bc9eb44a
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