** Description changed:
+ == SRU Justification ==
+ == Impact ==
+ It's been reported that on destroying a container causes a kernel Oops and
will hang the system. Issue is reproducible.
+
+ == Test Case ==
+ See reproducer below as described by user.
+
+ == Fix ==
+ http://marc.info/?l=linux-mm-commits&m=131603308900694&w=2
+
+ -----
+
On linux-image-2.6.38-11-generic and linux-image-3.0.0-10-server,
destroying a container causes a kernel OOPS and hang. This is totally
repeatable.
Procedure to repeat:
Use the attached perl program.
The perl program:
a) sets up a veth device
b) forks
c) does clone(NS_NEWNET) on the child
d) moves one end of the veth device into the child's network namespace
e) pings between the parent and the child and runs conntrack -L
f) kills the child after a while.
[NB: this section used to mention lxc - this is a red herring caused by
some surprising semantics of lxc, and in fact is nothing to do with the
bug]
The oops is in general not possible to catch save via the console as the
reboot/hang is immediate. However, I have attached an Oops from a
marginally different kernel (2.6.38-10-server on Lucid) which is created
in a marginally different way, but has the same call stack.
Bug information as required
1. System information.
lsb_release -rd gives:
Description: Ubuntu 11.04
Release: 11.04
or on another machine showing the same issue
$ lsb_release -rd
Description: Ubuntu oneiric (development branch)
Release: 11.10
2. apt-cache policy linux-image-2.6.38-11-generic
linux-image-2.6.38-11-generic:
Installed: 2.6.38-11.49
Candidate: 2.6.38-11.49
Version table:
*** 2.6.38-11.49 0
500 http://gb.archive.ubuntu.com/ubuntu/ natty-proposed/main amd64
Packages
100 /var/lib/dpkg/status
2.6.38-11.48 0
500 http://gb.archive.ubuntu.com/ubuntu/ natty-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu/ natty-security/main amd64
Packages
or on the second machine:
$ apt-cache policy linux-image-3.0.0-10-server
linux-image-3.0.0-10-server:
- Installed: 3.0.0-10.16
- Candidate: 3.0.0-10.16
- Version table:
- *** 3.0.0-10.16 0
- 500 http://gb.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
- 100 /var/lib/dpkg/status
-
+ Installed: 3.0.0-10.16
+ Candidate: 3.0.0-10.16
+ Version table:
+ *** 3.0.0-10.16 0
+ 500 http://gb.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
+ 100 /var/lib/dpkg/status
3) What I expected to happen:
Test program continues to run, showing ICMP traffic moving periodically
4) What actually happened:
Kernel hang within 10-20 seconds, Oops on console, data lost
5) We currently do not believe this to be a security vulnerability as
containers cannot be created as non-root.
- ---
+ ---
AlsaDevices:
- total 0
- crw-rw---- 1 root audio 116, 1 2011-09-10 19:18 seq
- crw-rw---- 1 root audio 116, 33 2011-09-10 19:18 timer
+ total 0
+ crw-rw---- 1 root audio 116, 1 2011-09-10 19:18 seq
+ crw-rw---- 1 root audio 116, 33 2011-09-10 19:18 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 1.22.1-0ubuntu2
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: Error: [Errno 2] No such file or directory
DistroRelease: Ubuntu 11.10
HibernationDevice: RESUME=UUID=49b12664-6859-4b83-b861-2354c9c23c26
InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Alpha amd64
(20110301.4)
IwConfig:
- lo no wireless extensions.
-
- eth0 no wireless extensions.
+ lo no wireless extensions.
+
+ eth0 no wireless extensions.
Lsusb:
- Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
- Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
+ Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
+ Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
MachineType: Bochs Bochs
Package: linux-lts-backport-natty
PciMultimedia:
-
+
ProcEnviron:
- LANG=en_GB.UTF-8
- SHELL=/bin/bash
+ LANG=en_GB.UTF-8
+ SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-11-server
root=/dev/mapper/hostname-root ro crashkernel=384M-2G:64M,2G-:128M quiet
ProcVersionSignature: Ubuntu 3.0.0-11.17-server 3.0.4
RelatedPackageVersions:
- linux-restricted-modules-3.0.0-11-server N/A
- linux-backports-modules-3.0.0-11-server N/A
- linux-firmware 1.60
+ linux-restricted-modules-3.0.0-11-server N/A
+ linux-backports-modules-3.0.0-11-server N/A
+ linux-firmware 1.60
RfKill: Error: [Errno 2] No such file or directory
Tags: oneiric
Uname: Linux 3.0.0-11-server x86_64
UpgradeStatus: Upgraded to oneiric on 2011-09-10 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 01/01/2007
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias:
dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs
** Also affects: linux (Ubuntu Natty)
Importance: Undecided
Status: New
** Also affects: linux-lts-backport-natty (Ubuntu Natty)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/843892
Title:
Repeatable kernel oops on container delete
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