Re: [BUG] Panic when booting

From: Guenter Roeck
Date: Sat Jan 18 2014 - 21:40:19 EST

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

[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.


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