linux-kernel - Re: [BUG] Panic when booting

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Message-ID: <52DB3AEC.5040708@roeck-us.net>
Date:	Sat, 18 Jan 2014 18:39:40 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Paul Bolle <pebolle@...cali.nl>, Madper Xie <cxie@...hat.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Panic when booting

On 01/17/2014 01:42 AM, Paul Bolle wrote:
> On Fri, 2014-01-17 at 17:34 +0800, Madper Xie wrote:
>> I meet following panic when I booting my HP Compad Elite 8300 Elite SFF
>> desktop.
>>
>> [call trace here:]
>> [    0.569993] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
>> [    0.578269] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W    3.13.0-rc8 #1
>> [    0.585496] Hardware name: Hewlett-Packard HP Compaq Elite 8300 SFF/3397, BIOS K01 v02.05 05/07/2012
>> [    0.594639]  ffffffffffffffff ffff880213125d70 ffffffff815dd70e ffffffff817e8598
>> [    0.602100]  ffff880213125de8 ffffffff815d72bb ffffffff00000010 ffff880213125df8
>> [    0.609570]  ffff880213125d98 ffff880213125da0 ffff880213125e08 0000000000000012
>> [    0.617050] Call Trace:
>> [    0.619511]  [<ffffffff815dd70e>] dump_stack+0x45/0x56
>> [    0.624664]  [<ffffffff815d72bb>] panic+0xc8/0x1d7
>> [    0.629470]  [<ffffffff81a36502>] mount_block_root+0x2a1/0x2b0
>> [    0.635309]  [<ffffffff81a36564>] mount_root+0x53/0x56
>> [    0.640467]  [<ffffffff81a366a3>] prepare_namespace+0x13c/0x174
>> [    0.646392]  [<ffffffff81a36184>] kernel_init_freeable+0x218/0x22b
>> [    0.652578]  [<ffffffff81a358d0>] ? do_early_param+0x88/0x88
>> [    0.658245]  [<ffffffff815cc450>] ? rest_init+0x80/0x80
>> [    0.663493]  [<ffffffff815cc45e>] kernel_init+0xe/0x120
>> [    0.668724]  [<ffffffff815ed43c>] ret_from_fork+0x7c/0xb0
>> [    0.674125]  [<ffffffff815cc450>] ? rest_init+0x80/0x80
>> [    0.792437] Rebooting in 3 seconds..
>
> [...]
>
>> I can reproduce it 100%.
>> Will do a bisect next monday if no one has clue.
>
> I'd double check my bootloader configuration and the initramfs (which
> you're probably using) if I'd encountered ab backtrace like that before
> bisecting. But we seem to be missing quite a bit of dmesg's output, so
> that's a bit of a guess...
>

FWIW, I am getting the same panic if I build 3.13-rc8 with Ubuntu's config-3.11.0-15-generic
after running "make oldnoconfig" on it. My own scaled down configuration from an earlier kernel
works just fine.

I thought it was operator error, went back to my old configuration, and didn't think
about it anymore, but maybe there is something fishy in the resulting configuration.

Guenter

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