** Description changed:
+ == SRU Justification ==
+ Commit 52df157f17e5 introduced a regression in v4.13-rc1. This regression
+ causes a stack trace to occur when tearing down an LXD container. The process
+ hangs with the following message:
+
+ "unregister_netdevice: waiting for eth0 to become free. Usage count = 5"
+
+ This regression is fixed by commit 510c321b5571, which is in mainline as of
+ v4.16-rc7. The fix is needed in Artful and Bionic. However, Artful needs
+ a prereq commit, so it's SRU request will be sent separately.
+
+
+ == Fix ==
+ 510c321b5571 ("xfrm: reuse uncached_list to track xdsts")
+
+ == Regression Potential ==
+ Low. This commit is to fix a current regression.
+
+
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
+
This occurs when tearing down an LXD container.
LXD monitor process hangs with the following stack:
$ sudo cat /proc/27043/stack
[<ffffffff8af0022e>] msleep+0x2e/0x40
[<ffffffff8b5dc9cf>] netdev_run_todo+0x11f/0x310
[<ffffffff8b5e9d4d>] rtnetlink_rcv+0x2d/0x30
[<ffffffff8b612cdc>] netlink_unicast+0x18c/0x240
[<ffffffff8b61306d>] netlink_sendmsg+0x2dd/0x3c0
[<ffffffff8b5b8f08>] sock_sendmsg+0x38/0x50
[<ffffffff8b5b99c3>] ___sys_sendmsg+0x2e3/0x2f0
[<ffffffff8b5ba354>] __sys_sendmsg+0x54/0x90
[<ffffffff8b5ba3a2>] SyS_sendmsg+0x12/0x20
[<ffffffff8ae03a7b>] do_syscall_64+0x5b/0xc0
[<ffffffff8b800257>] entry_SYSCALL64_slow_path+0x8/0x8
[<ffffffffffffffff>] 0xffffffffffffffff
Issue submitted to LXD as well ([1]), though as indicated there, it
seems to be a kernel bug.
[1] https://github.com/lxc/lxd/issues/4208
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-32-generic 4.13.0-32.35~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Wed Jan 31 11:42:59 2018
InstallationDate: Installed on 2016-11-09 (447 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1746474
Title:
unregister_netdevice: waiting for eth0 to become free. Usage count = 5
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