SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2017-November/088106.html
** Description changed:
- When running 2 docker containers, one as samba server and another one as
- samba client that mounts and umounts a smb share a kernel OOps can be
- triggered on multiple kernels.
+ == SRU Justification ==
+ This bug causes Samba mount and umounts in docker container to trigger
+ a kernel Oops. When running 2 docker containers, one as samba server and
+ another one as samba client that mounts and umounts a smb share a kernel
+ OOps can be triggered.
+
+ This bug happens in Xenial and Zesty, and is fixed by the following two
commits:
+ 76da0704507b ("ipv6: only call ip6_route_dev_notify() once for
NETDEV_UNREGISTER")
+ 12d94a804946 ("ipv6: fix NULL dereference in ip6_route_dev_notify()")
+
+ Both commits are clean cherry picks. 76da0704507b is in mainline as of v4.12.
+ Commit 12d94a804946 is in mainline as of v4.13-rc6.
+
+ == Fixes ==
+ commit 76da0704507bbc51875013f6557877ab308cfd0a
+ Author: WANG Cong <xiyou.wangcong at gmail.com>
+ Date: Tue Jun 20 11:42:27 2017 -0700
+
+ ipv6: only call ip6_route_dev_notify() once for NETDEV_UNREGISTER
+
+ commit 12d94a804946af291e24b80fc53ec86264765781
+ Author: Eric Dumazet <edumazet at google.com>
+ Date: Tue Aug 15 04:09:51 2017 -0700
+
+ ipv6: fix NULL dereference in ip6_route_dev_notify()
+
+ == Regression Potential ==
+ Both commits are specific to ipv6 and fix a regression introduced into Xenial
and Zesty.
+
+ == Test Case ==
+ A test kernel was built with these patches and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
The kernel message:
- unregister_netdevice: waiting for lo to become free. Usage count = 1
+ unregister_netdevice: waiting for lo to become free. Usage count = 1
shows up, some minutes later the oops and/or warnings happens.
-
The scripts to trigger the kernel Oops can be found at:
https://github.com/fho/docker-samba-loop
I was able to reproduce kernel Oopses on a clean Ubuntu 16.0.4 installation
with:
- linux-image-4.4.0-93-generic=4.4.0-93.116~14.04.1
- linux-image-4.10.0-32-generic=4.10.0-32.36~16.04.1
- linux-image-4.11.0-14-generic=4.11.0-14.20~16.04.1
In a different scenario were Ubuntu 16.04 servers were running multiple
docker containers with Nginx or small network applications in parallel,
I was also able to reproduce the kernel Oopses also on:
- linux-image-4.10.0-1004-gcp
- linux-image-4.12.10-041210-generic=4.12.10-041210.20170830
I haven't tried again to reproduce it with those kernels on a clean Ubuntu
installation and unfortunately didn't kept the kernel logs.
The "unregister_netdevice: waiting for lo to become free. Usage count =
1" messages are related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1711407 which is
handled as separate issue.
-
According to https://github.com/moby/moby/issues/35068 the crash is fixed by:
https://patchwork.ozlabs.org/patch/801533/
https://patchwork.ozlabs.org/patch/778449/
- ---
+ ---
AlsaDevices:
- total 0
- crw-rw---- 1 root audio 116, 1 Nov 3 09:51 seq
- crw-rw---- 1 root audio 116, 33 Nov 3 09:51 timer
+ total 0
+ crw-rw---- 1 root audio 116, 1 Nov 3 09:51 seq
+ crw-rw---- 1 root audio 116, 33 Nov 3 09:51 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
DistroRelease: Ubuntu 16.04
IwConfig: Error: [Errno 2] No such file or directory
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: Google Google Compute Engine
Package: linux (not installed)
PciMultimedia:
-
+
ProcEnviron:
- TERM=rxvt-unicode-256color
- PATH=(custom, no user)
- LANG=en_US.UTF-8
- SHELL=/bin/bash
+ TERM=rxvt-unicode-256color
+ PATH=(custom, no user)
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
ProcFB:
-
+
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-37-generic
root=UUID=bf9a017a-931d-4191-84bc-b8434dbba527 ro scsi_mod.use_blk_mq=Y
console=ttyS0
ProcVersionSignature: Ubuntu 4.10.0-37.41~16.04.1-generic 4.10.17
RelatedPackageVersions:
- linux-restricted-modules-4.10.0-37-generic N/A
- linux-backports-modules-4.10.0-37-generic N/A
- linux-firmware N/A
+ linux-restricted-modules-4.10.0-37-generic N/A
+ linux-backports-modules-4.10.0-37-generic N/A
+ linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial uec-images xenial uec-images
Uname: Linux 4.10.0-37-generic x86_64
UnreportableReason: The report belongs to a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
-
+
_MarkForUpload: False
dmi.bios.date: 01/01/2011
dmi.bios.vendor: Google
dmi.bios.version: Google
dmi.board.asset.tag: A3DDBB61-646B-C60C-3999-1F1D7B7A334A
dmi.board.name: Google Compute Engine
dmi.board.vendor: Google
dmi.chassis.type: 1
dmi.chassis.vendor: Google
dmi.modalias:
dmi:bvnGoogle:bvrGoogle:bd01/01/2011:svnGoogle:pnGoogleComputeEngine:pvr:rvnGoogle:rnGoogleComputeEngine:rvr:cvnGoogle:ct1:cvr:
dmi.product.name: Google Compute Engine
dmi.sys.vendor: Google
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https://bugs.launchpad.net/bugs/1729637
Title:
Samba mount/umount in docker container triggers kernel Oops
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