Re: [gentoo-user] gentoo-sources-2.6.35-r12 causes kernel panic

[Mark Knecht]

On Sat, Nov 27, 2010 at 6:59 AM, Mick <michaelkintzios@×××××.com> wrote:
> I haven't had much luck with the 2.6.35 version of kernels - they have
> cause panics on two different x86 boxen.
>
> Now that 2.6.35 has gone stable so I tried it again and I'm getting a
> kernel panic complaining about VFS unable to mount root fs:
> ==================================
> VFS:  Cannot open root device "sda3" or unknown-block(0,0)
> Please append a correct "root=" boot option; here are the available partitions:
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> Pid: 1, comm: swapper Not tainted 2.6.35-gentoo-r12 #2
> Call Trace:
>  [<c14b3530>] ? panic+0x5f/0xc6
>  [<c1693c68>] ? mount_block_root+0x1c2/0x245
>  [<c1002930>] ? do_signal+0x766/0x7f2
>  [<c1693d31>] ? mount_root+0x46/0x5a
>  [<c1693e8b>] ? prepare_namespace+0x146/0x182
>  [<c1093203>] ? sys_access+0x1f/0x23
>  [<c16933f1>] ? kernel_init+0x1a9/0x1b7
>  [<c1693248>] ? kernel_init+0x0/0x1b7
>  [<c10030b6>] ? kernel_thread_helper+0x6/0x10
> panic occurred, switching back to text console
> ==================================
<SNIP>
>
> Am I missing something obvious to make the 2.6.35 series work with my boxen?
>
> Please ask if you need more info.
> --
> Regards,
> Mick
>
>

Hi Mick,
   OK, there's so many possibilities for what causes this. Basic
confusion ensues...

1) When booting, if you look carefully, is the initial kernel seeing
_any_ disks? Sometimes they fly bye and are hard to catch. If it is
then is it showing sda3?

2) What sort of file system did you put on sda3? I assume this is
built into the kernel if this is an upgrade?

3) Post the appropriate part of grub.conf to show how you are booting.

4) Post fstab

- Mark