qemu-img convert hangs on Ubuntu Server 16.04 with 100% cpu
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Undecided
|
Unassigned | ||
qemu-kvm (Ubuntu) |
Expired
|
Undecided
|
Unassigned |
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.
dpkg -s qemu-kvm | grep Version
Version: 1:2.5+dfsg-
dpkg -s qemu-utils | grep Version
Version: 1:2.5+dfsg-
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-
PackageArchitec
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
Tags: xenial
Uname: Linux 4.6.0-040600-
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
Thanks for the info.
If updating kernels fixes it, then it's possible, but unlikely, that it can be fixed in userspace. Marking this as affecting the kernel.