Re: Kernel panic - not syncing: Attempted to kill init!

[David F Barrera <dfbp@us.ibm.com>]

Ian,

Thanks for the reply and the suggestions. Some details about my setup:
/dev/hdc3  is where xen0 is running
/dev/hdc1 --  another partition that actually has a copy of RHEL 4  Beta 
2 installed (working OS)
/etc/fstab:
# This file is edited by fstab-sync - see 'man fstab-sync' for details
/dev/hdc3               /                       ext2    defaults        1 1
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /dev/shm                tmpfs   defaults        0 0
none                    /proc                   proc    defaults        0 0
none                    /sys                    sysfs   defaults        0 0
/dev/hdc2               swap                    swap    defaults        0 0
/dev/hda                /media/cdrom            auto    
pamconsole,ro,exec,noauto,managed 0 0
~

The config file that I am using:

# Kernel image file.
kernel = "/boot/vmlinuz-2.6.9-xenU"
# Optional ramdisk.
ramdisk = "/boot/initrd-2.6.9-xenU.img"
# The domain build function. Default is 'linux'.
builder='linux'
# Initial memory allocation (in megabytes) for the new domain.
memory = 64
# A name for your domain. All domains must have different names.
name = "test1"
# disk = [ 'phy:hda1,hda1,r' ]
disk = [ 'phy:hdc1,hdc1,w' ]
# Set if you want dhcp to allocate the IP address.
dhcp="dhcp"
# Set root device.
root = "/dev/hdc1 ro/"
# Sets runlevel 4.
extra = "4"
#============================================================================
~


Ian Pratt wrote:

>>Derrick,
>>
>>I rebuilt the xenU kernel, with the devfs support disabled, and it makes 
>>no difference. It behaves in the same manner as the pre-built kernel 
>>that's included with the binary pack.  I am at a loss. I've been able to 
>>boot a kernel under xen on a SuSE Linux 9.0 machine, so I've had a 
>>little experience with this:-) 
>>    
>>
>
>David, earlier in the boot messages do you see the hdc1 partition
>being found when the partition check happens?
>  
>
This is the entire log:

Linux version 2.6.9-xenU (root@dyn95394184.austin.ibm.com) (gcc version 
3.4.2 20041017 (Red Hat 3.4.2-6.fc3)) #1 Fri Dec 17 15:50:10 CST 2004
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000004000000 (usable)
64MB LOWMEM available.
DMI not present.
Built 1 zonelists
Kernel command line:  ip=:1.2.3.4::::eth0:dhcp root=/dev/hdc1 ro/ 4
Initializing CPU#0
PID hash table entries: 512 (order: 9, 8192 bytes)
Xen reported: 866.697 MHz processor.
Using tsc for high-res timesource
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 61900k/65536k available (1569k kernel code, 3596k reserved, 429k 
data, 92k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: L1 I cache: 16K, L1 D cache: 16K
CPU: L2 cache: 256K
CPU: Intel Pentium III (Coppermine) stepping 06
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... disabled
checking if image is initramfs... it is
Freeing initrd memory: 600k freed
NET: Registered protocol family 16
Initializing Cryptographic API
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Xen virtual console successfully installed as tty
Event-channel device installed.
Starting Xen Balloon driver
xen_blk: Initialising virtual block device driver
Using anticipatory io scheduler
xen_net: Initialising virtual ethernet driver.
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 4096 bind 8192)
NET: Registered protocol family 1
NET: Registered protocol family 17
IP-Config: Incomplete network configuration information.
Freeing unused kernel memory: 92k freed
Red Hat nash version 4.1.18 starting
Mounted /proc filesystem
Mounting sysfs
Creating /dev
Starting udev
Creating root device
Mounting root filesystem
mount: error 6 mounting ext2
mount: error 2 mounting none
Switching to new root
switchroot: mount failed: 22
umount /initrd/dev failed: 2
Kernel panic - not syncing: Attempted to kill init!
 <0>Rebooting in 1 seconds..


>You'll need to export the partition 'rw' eventually, but that's
>not your current problem.
>  
>
Right. Already tried it.

>You might like to try exporting it as 'sda1' or something to see
>if that helps. Not sure why it would, but I've heard folklore
>along these lines. 
>  
>
I had tried that (and hda1) before, but sda1 I get an error, too:
[root@dyn95394184 xen]# xm create -c test1 vmid=1
Using config file "test1".
Error: Error creating domain: vbd: Device not found: sda1

>Adding some more debugging to the linuxrc nash script might shed
>some light on the problem. 
>  
>
I need to find out how to do this first...

>Also, what happens if you skip the initrd and try booting
>directly off the disk. I doubt there's anything in the initrd you
>need.
>  
>
I had tried it, also.  I get a VFS error if I don't use an initrd

VFS: Cannot open root device "hdc1" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(2,0)
 <0>Rebooting in 1 seconds..


>Ian
>
> 
>  
>
>>Freeing unused kernel memory: 92k freed
>>Red Hat nash version 4.1.18 starting
>>Mounted /proc filesystem
>>Mounting sysfs
>>Creating /dev
>>Starting udev
>>Creating root device
>>Mounting root filesystem
>>mount: error 6 mounting ext3
>>mount: error 2 mounting none
>>Switching to new root
>>switchroot: mount failed: 22
>>umount /initrd/dev failed: 2
>>Kernel panic - not syncing: Attempted to kill init!
>> <0>Rebooting in 1 seconds..
>>
>>
>>David Barrera
>>
>>
>>Derrik Pates wrote:
>>
>>    
>>
>>>David F Barrera wrote:
>>>
>>>      
>>>
>>>>The distro I am using is  RHEL 4 Beta 2 (Red Hat Enterprise Linux 
>>>>Desktop release 3.90 (Nahant)
>>>>        
>>>>
>>>      
>>>
>>>>/dev/hdc1               /                       ext2    
>>>>defaults        1 1
>>>>        
>>>>
>>>      
>>>
>>>>LABEL=SWAP-hdc2         swap                    swap    
>>>>defaults        0 0
>>>>/dev/hda                /media/cdrom            auto    
>>>>pamconsole,fscontext=system_u:object_r:removable_t,ro,exec,noauto,managed 
>>>>0 0
>>>>        
>>>>
>>>      
>>>
>>>># disk = [ 'phy:hda1,hda1,r' ]
>>>>disk = [ 'phy:hdc1,hdc1,r' ]
>>>>        
>>>>
>>>Well, the configuration of the virtual disk looks correct; the swap 
>>>might disagree with it, but that shouldn't appear until later in the 
>>>boot process. Perhaps it's an interaction with devfs? Do you have 
>>>devfs enabled in your xenU (unprivileged domain) kernel? This gave me 
>>>fits when I first began using Xen, mostly because it seems that the 
>>>xenU prebuilt kernel that's included with the binary pack has devfs 
>>>support enabled, and this breaks things. The only other possibility I 
>>>can think of is that you need to change the block-device import to 
>>>read-write.
>>>
>>>      
>>>
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>>    
>>
>
>
>
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>  
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