Thanks Matt, yeah we actually had no similar report in all the time.
It is unclear to me if there still is something needed in the kernel, but it is
unclear which (if any) qemu change needs to be done as there is no external
reproducer.
It is good to hear that in your case after working heavily it just resolved
itself.
** Changed in: qemu-kvm (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1603902
Title:
qemu-img convert hangs on Ubuntu Server 16.04 with 100% cpu
Status in linux package in Ubuntu:
Incomplete
Status in qemu-kvm package in Ubuntu:
Incomplete
Bug description:
When i try to convert raw image to qcow2 format with command:
qemu-img convert -O qcow2 base-image.img base-image.qcow2
i have several problems:
1. qemu-img process never stops by itself and i can not kill it with kill
-9
2. qemu-img process utilizes 100% of one cpu core
Additional information:
1. I use supermicro server with 28 cpu cores and host Ubuntu Server 16.04
2. Filesystem is ext4
3. Original VM raw image (with installed guest Ubuntu Server 16.04) works
without any problem. When i am trying to convert formats this VM is powered off.
4. uname -r
4.4.0-28-generic
dpkg -s qemu-kvm | grep Version
Version: 1:2.5+dfsg-5ubuntu10.2
dpkg -s qemu-utils | grep Version
Version: 1:2.5+dfsg-5ubuntu10.2
strace qemu-img convert -O qcow2 base-image.img base-image.qcow2
...
lseek(10, 1361051648, SEEK_DATA) = 1386217472
lseek(10, 1386217472, SEEK_DATA) = 1386217472
lseek(10, 1386217472, SEEK_HOLE) = 1403359232
lseek(10, 1403359232, SEEK_DATA) = 1403387904
lseek(10, 1403387904, SEEK_DATA) = 1403387904
lseek(10, 1403387904, SEEK_HOLE) = 1419091968
lseek(10, 1419091968, SEEK_DATA
What can cause such strange behavior, and how can i convert raw image
to qcow2 format?
UPDATED: I have installed 4.6.0 linux kernel, and everything works fine right
now. But the question still exists: is there any other way to fix this bug for
qemu-img and Ubuntu 16.04?
---
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2016-07-11 (6 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.3)
Package: qemu-kvm 1:2.5+dfsg-5ubuntu10.2
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
Tags: xenial
Uname: Linux 4.6.0-040600-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
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