[Qemu-devel] QEMU running busybox + customized kernel

[Qemu-devel] QEMU running busybox + customized kernel

[Peter Teoh]

I followed the following instruction:

http://dev.gentoo.org/~solar/busybox/bbemu

and my commandline is like:

qemu -kernel /boot/vmlinuz-2.6.26-rc5 -append "console=ttyS0
root=/dev/hda init=/bin/sh rootfstype=ext3 ro" small_os_rootfs -initrd
/boot/initrd-2.6.26-rc5-4.img -nographic

I get the following trace:

Loading scsi_mod.ko module
[    6.206933] SCSI subsystem initialized
[    6.210050] insmod used greatest stack depth: 2944 bytes left
Loading sd_mod.ko module
[    6.238568] Driver 'sd' needs updating - please use bus_type methods
Loading dock.ko module
[    6.260651] ACPI Exception (utmutex-0263): AE_BAD_PARAMETER, Thread
C71AD6A0 could not acquire Mutex [1] [20080321]
[    6.263898] No dock devices found.
Loading libata.ko module
Loading ata_piix.ko module
Loading uhci-hcd.ko module
[    6.454178] USB Universal Host Controller Interface driver v3.0
Loading ohci-hcd.ko module
Loading ehci-hcd.ko module
Loading ahci.ko module
Loading dm-mod.ko module
[    6.642118] device-mapper: ioctl: 4.13.0-ioctl (2007-10-18)
initialised: dm-devel@redhat.com
Loading dm-log.ko module
Loading dm-mirror.ko module
Loading dm-zero.ko module
Loading dm-snapshot.ko module
Making device-mapper control node
Scanning logical volumes
  Reading all physical volumes.  This may take a while...
  No volume groups found
[    6.852484] lvm used greatest stack depth: 2620 bytes left
Activating logical volumes
  Volume group "clairevg" not found
Creating root device.
Mounting root filesystem.
[    7.106232] kjournald starting.  Commit interval 5 seconds
[    7.106844] EXT3-fs: mounted filesystem with ordered data mode.
Setting up other filesystems.
Setting up new root fs
no fstab.sys, mounting internal defaults
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
WARNING: can't access /bin/sh
exec of init (/bin/sh) failed!!!: No such file or directory
[    7.147743] nash-hotplug used greatest stack depth: 2532 bytes left
[    7.149126] Kernel panic - not syncing: Attempted to kill init!

The other errors except for the last one ("exec of init (/bin/sh)
failed!!!: No such file or directory") I think can be ignored.   So
why /bin/sh failed?


I changed the qemu commandline to (init=/bin/sh changed to init=/sbin/init):

qemu -kernel /boot/vmlinuz-2.6.26-rc5 -append "console=ttyS0
root=/dev/hda init=/sbin/init rootfstype=ext3 ro" small_os_rootfs
-initrd /boot/initrd-2.6.26-rc5-4.img -nographic

[    6.945974] lvm used greatest stack depth: 2620 bytes left
Activating logical volumes
  Volume group "clairevg" not found
Creating root device.
Mounting root filesystem.
[    7.216936] kjournald starting.  Commit interval 5 seconds
[    7.217605] EXT3-fs: mounted filesystem with ordered data mode.
Setting up other filesystems.
Setting up new root fs
no fstab.sys, mounting internal defaults
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init.
unmounting old /dev
unmounting old /proc
unmounting old /sys
[    7.458915] mount used greatest stack depth: 2240 bytes left
Bummer, could not run '/bin/sh': No such file or directory
Bummer, could not run '/bin/sh': No such file or directory
Bummer, could not run '/etc/init.d/rcS': No such file or directory
Bummer, could not run '/bin/sh': No such file or directory
Bummer, could not run '/bin/sh': No such file or directory

Notice the last line keep repeating.......why???

I am looking for a HOWTO on qemu running Busybox + customized kernel
to test out the various kernel image.   Anybody got any good
suggestions?

Thanks.


-- 
Regards,
Peter Teoh

Re: [Qemu-devel] QEMU running busybox + customized kernel

[Mulyadi Santosa]

On Thu, Jun 12, 2008 at 10:23 PM, Peter Teoh <htmldeveloper@gmail.com> wrote:
> I followed the following instruction:
>
> http://dev.gentoo.org/~solar/busybox/bbemu
>
> and my commandline is like:
>
> qemu -kernel /boot/vmlinuz-2.6.26-rc5 -append "console=ttyS0
> root=/dev/hda init=/bin/sh rootfstype=ext3 ro" small_os_rootfs -initrd
> /boot/initrd-2.6.26-rc5-4.img -nographic

a. i didn't see -hda in your above qemu invocation, is that correct?

b. are u sure /bin/sh is indeed the correct busybox binary and it's
already inside the disk image?

regards,

Mulyadi