** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Status: Triaged => Invalid
** Changed in: linux (Ubuntu Xenial)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Xenial)
Assignee: (unassigned) => Joseph Salisbury (jsalisbury)
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1772575
Title:
Kernel 4.4 NBD size overflow with image size exceeding 1TB
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Xenial:
In Progress
Bug description:
Release 16.04, kernel 4.4.0-124-generic
There's an issue in kernel's NBD module which prevents some larger images to
be
correctly "connected" , largely described here:
https://github.com/NetworkBlockDevice/nbd/issues/44
There is a small patch here that was accepted into mainline 4.10:
https://www.spinics.net/lists/linux-block/msg07060.html
This is a regression from the previous LTS 3.13 kernel.
----
Here is a small example of the faulty behaviour:
# qemu-img create -f qcow2 test.img 1100G
Formatting 'test.img', fmt=qcow2 size=1181116006400 cluster_size=65536
lazy_refcounts=off refcount_bits=16
# qemu-nbd -c /dev/nbd0 test.img
# blockdev --getsize64 /dev/nbd0
18446743055802302464
The correct response would be 1181116006400; this breaks most tools
and makes the image unusable, e.g.
# fdisk -l /dev/nbd0
fdisk: cannot open /dev/nbd0: Invalid argument
---
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 May 21 12:51 seq
crw-rw---- 1 root audio 116, 33 May 21 12:51 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.20.1-0ubuntu2.17
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:
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=/dev/mapper/VolGroup00-swap_1
IwConfig: Error: [Errno 2] No such file or directory
MachineType: Supermicro SYS-1028R-WTR
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
LANGUAGE=en_AU:
TERM=xterm
PATH=(custom, no user)
LANG=en_AU
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-124-generic
root=/dev/mapper/VolGroup00-root ro nomodeset elevator=noop consoleblank=0
net.ifnames=0 biosdevname=0 modprobe.blacklist=igb nosplash quiet
ProcVersionSignature: Ubuntu 4.4.0-124.148-generic 4.4.117
RelatedPackageVersions:
linux-restricted-modules-4.4.0-124-generic N/A
linux-backports-modules-4.4.0-124-generic N/A
linux-firmware 1.157.18
RfKill: Error: [Errno 2] No such file or directory
Tags: xenial xenial
Uname: Linux 4.4.0-124-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: 02/08/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3.0a
dmi.board.asset.tag: Default string
dmi.board.name: X10DRW-i
dmi.board.vendor: Supermicro
dmi.board.version: 1.10
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3.0a:bd02/08/2018:svnSupermicro:pnSYS-1028R-WTR:pvr0123456789:rvnSupermicro:rnX10DRW-i:rvr1.10:cvnSupermicro:ct1:cvr0123456789:
dmi.product.name: SYS-1028R-WTR
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
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