Kernel Panic – What Is a Kernel Panic?

I just had the same problem on gentoo with a 3.5.0 kernel. No matter what online example I tried no output got to the client until I ran the following command:

 dmesg -n 7

I originally tried

dmesg -n 8

which was suggested in the kernel documentation but that returned

localhost ~ # dmesg -n 8
dmesg: unknown level '8'

where dmesg -n 7 worked

localhost ~ # dmesg -n 7
localhost ~ # echo check > /sys/block/md0/md/sync_action

Here is what I got on the client

datastore1 ~ # nc -l -p 30000 -u
[ 9698.913098] md: data-check of RAID array md0
[ 9698.913112] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
[ 9698.913124] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check.
[ 9698.913150] md: using 128k window, over a total of 1048512k.
[ 9718.197555] md: md0: data-check done.

BTW, Here is how I setup the netconsole:

modprobe netconsole netconsole="@/eth0,30000@192.168.1.31/"

Try this, update chroot mode.

1. Boot live with usb or anything

2. Mount root partition, type following commands

    sudo mount /dev/sda7 /mnt
    sudo mount --bind /dev /mnt/dev
    sudo mount --bind /sys /mnt/sys
    sudo mount --bind /proc /mnt/proc
   

3. Now move to initial chroot environment, give this commands

    sudo chroot /mnt
    apt-get update
    apt-get upgrade
    exit
   

4. Unmont the chroot mode, by typing this

   sudo umount /mnt/proc
   sudo umount /mnt/sys
   sudo umount /mnt/dev
   sudo umount /mnt
   

I hope it works