Public bug reported:
Steps to reproduce:
1. Install Ubuntu 16.04 LTS.
2. Try to install some distro (disk.iso) from ISO-file to USB-flash (/dev/sdc)
with
sudo kvm -hda /dev/sdc -m 1024 -cdrom disk.iso -boot d
3. Get warning:
WARNING: Image format was not specified for '/dev/sdc' and probing guessed
raw.
Automatically detecting the format is dangerous for raw images, write
operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
4. After some time get file-system error on usb-flash drive (or GRUB
error, or drop to initramfs).
Expected results:
User is able to use simple QEMU-KVM command for installing distro to USB-flash
(for example).
Actual results:
Got file-system corruption on USB-flash.
Possible solution:
Pass format=raw to the kvm command (see this commit
https://github.com/hartwork/grub2-theme-preview/commit/0cb285d98adeb644c50a915d6f350a56daa0cba2
of grub2-theme-preview):
kvm -drive file=/dev/sdc,format=raw -m 1024 -cdrom disk.iso -boot d
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: qemu-kvm 1:2.5+dfsg-5ubuntu10.10
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Apr 21 00:48:36 2017
InstallationDate: Installed on 2014-02-07 (1168 days ago)
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64
(20140204)
KvmCmdLine:
COMMAND STAT EUID RUID PID PPID %CPU COMMAND
kvm-irqfd-clean S< 0 0 349 2 0.0 [kvm-irqfd-clean]
qemu-system-x86 Sl+ 1000 1000 6635 6430 56.7 qemu-system-x86_64
-enable-kvm -drive file=/home/nikolay/Temp/8G.raw,format=raw -m 1024 -cdrom
ubuntu-1610-mini.iso -boot d
kvm-pit/6635 S 0 0 6639 2 0.0 [kvm-pit/6635]
MachineType: ASUSTeK COMPUTER INC. UX32A
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-72-generic
root=UUID=1e3c78e2-1a6e-4afe-8249-40fe7fa81a86 ro quiet splash vt.handoff=7
SourcePackage: qemu
UpgradeStatus: Upgraded to xenial on 2017-04-15 (4 days ago)
dmi.bios.date: 02/12/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX32A.216
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX32A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrUX32A.216:bd02/12/2014:svnASUSTeKCOMPUTERINC.:pnUX32A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX32A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: UX32A
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug xenial
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https://bugs.launchpad.net/bugs/1685031
Title:
qemu-kvm corrupts filesystems on usb-flash drive if raw format is not
specified
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