** Description changed:
+ 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 <jb...@redhat.com>
+ Date: Sat Mar 28 19:13:22 2015 +0100
+
+ ipvlan: fix addr hash list corruption
+
+ --
+
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
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: linux (Ubuntu Vivid)
Status: New => Triaged
** Changed in: linux (Ubuntu Vivid)
Assignee: (unassigned) => Luis Henriques (henrix)
** Changed in: linux-lts-vivid (Ubuntu Trusty)
Status: New => Triaged
** Changed in: linux-lts-vivid (Ubuntu Trusty)
Assignee: (unassigned) => Luis Henriques (henrix)
** Changed in: linux-lts-vivid (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1475434
Title:
ipvlan module causes kernel crashes (backport fixes from upstream)
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