Public bug reported:
1. % lsb_release -rd
Description: Ubuntu 15.10
Release: 15.10
2.
% apt-cache policy linux-image-generic
linux-image-generic:
Installed: (none)
Candidate: 4.2.0.30.33
Version table:
4.2.0.30.33 0
500 http://us.archive.ubuntu.com/ubuntu/ wily-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu/ wily-security/main amd64 Packages
4.2.0.16.18 0
500 http://us.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
(kriek) ~ % apt-cache policy qemu-utils
qemu-utils:
Installed: 1:2.3+dfsg-5ubuntu9.2
Candidate: 1:2.3+dfsg-5ubuntu9.2
Version table:
*** 1:2.3+dfsg-5ubuntu9.2 0
500 http://us.archive.ubuntu.com/ubuntu/ wily-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu/ wily-security/main amd64 Packages
100 /var/lib/dpkg/status
1:2.3+dfsg-5ubuntu9 0
500 http://us.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
3. Configure an NBD device with a qemu image and then mount it. The base image
is a wily amd64 cloud-image in raw format.
Created the qcow2 device with: qemu-img create -f qcow2 -b
/path/to/cloud-image.raw boot.img 2G
Connect to nbd: sudo qemu-nbd -c /dev/nbd0 boot.img
Mount it: sudo mount /dev/nbd0 /mnt
Mount succeeds and I can examine the image.
% qemu-img info --backing-chain boot.img
image: boot.img
file format: qcow2
virtual size: 2.0G (2147483648 bytes)
disk size: 196K
cluster_size: 65536
backing file: /srv/images/wily/amd64/20160218/vmtest.root-image
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
image: /srv/images/wily/amd64/20160218/vmtest.root-image
file format: raw
virtual size: 1.4G (1468006400 bytes)
disk size: 1.4G
4. mount command hung and kernel emitted BUG().
In reproducing this may be relevant.
a. Configure NBD with boot.img as in (3)
b. while still mounted rm boot.img
c. disconnect: qemu-nbd -d /dev/nbd0
d. unmount: umount /mnt
Then repeat (3).
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-19-generic 4.2.0-19.23
ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
Uname: Linux 4.2.0-19-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.2.0-19-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/hwC0D3', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p',
'/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer']
failed with exit code 1:
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Date: Thu Mar 3 09:18:14 2016
HibernationDevice: RESUME=/dev/mapper/kriek--vg-swap_1
InstallationDate: Installed on 2015-05-10 (297 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.3)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-19-generic
root=/dev/mapper/hostname--vg-root ro nomdmonddf nomdmonisw
RelatedPackageVersions:
linux-restricted-modules-4.2.0-19-generic N/A
linux-backports-modules-4.2.0-19-generic N/A
linux-firmware 1.149.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/05/2014
dmi.bios.vendor: Intel Corp.
dmi.bios.version: RKPPT10H.86A.0037.2014.1105.1813
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: D53427RKE
dmi.board.vendor: Intel Corporation
dmi.board.version: G87971-406
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnIntelCorp.:bvrRKPPT10H.86A.0037.2014.1105.1813:bd11/05/2014:svn:pn:pvr:rvnIntelCorporation:rnD53427RKE:rvrG87971-406:cvn:ct3:cvr:
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug wily
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1552752
Title:
kernel bug when mounting a qemu-nbd backed image
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1552752/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
