linux-kernel - Re: Cannot boot xen DomU

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Date:	Fri, 18 Jan 2008 09:26:21 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	xming <xmingske@...il.com>
CC:	linux-kernel@...r.kernel.org,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: Cannot boot xen DomU > 2.6.23.1

xming wrote:
>> Would it be possible to map the eip and some top parts of the stack back
>> to kernel symbols?  Seems to be the same place in both traces, which is
>> interesting.
>>     
>
> Can you tell me how, or show me some pointers?
>   

Do "nm -n vmlinux" on the kernel to set an address sorted list of 
symbols, and then look to see what's near the eip (c037c0c7) and near 
the top of the stack (c0100add, c0378980, c0101962, ...).  Some of these 
may be in data, or other strange places, but the ones which correspond 
to code are interesting.

>>> Scenario 2 (have_vcpu_info_placement = 0)
>>> --------------------------------------------------------------
>>>
>>> test1: no crash
>>> test2: no crash, but occationally I still get funny output like this
>>>
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 0000AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 000AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 000AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>> 00AAAAAAAAAAAAAAAAAAAAAAAAAAZZ
>>>
>>>       
>> Hm, I guess some of the output is getting dropped.  Does this happen
>> with 2.6.18-xen?
>>     
>
> yes it does
>   

OK, good.  I Didn't Break It (tm) ;)

    J
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