Re: [Xen-devel] qeustion: a panic in __do_update_va_mapping()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 01/11/16 11:23, Xuquan (Quan Xu) wrote:
> On November 01, 2016 7:16 PM, Andrew Cooper < andrew.cooper3@xxxxxxxxxx > 
> wrote:
>> On 01/11/16 11:01, Xuquan (Quan Xu) wrote:
>>> Hi Andrew,
>>>
>>> When I run some application with Xen, I encounter a Panic with log as the
>> bottom of this email.
>>> I find this panic is as similar as your fix e4e9d2d4e76bd8fe22 'x86/p2m-ept:
>> don't unmap the EPT pagetable while it is still in use'.
>>
>> Its not the same.  My fix was for a pagefault.  Your crash is hitting a
>> BUG()
>>
>> You need to investigate which BUG() is being hit (you are clearly not using 
>> staging,
>> as page_alloc.c:429 is outside of a function), and why.
>>
> It is not using staging, a internal version, but the __do_update_va_mapping() 
> is the same..
> So I think it is similar to staging.

__do_update_va_mapping() is not relevant.  Your problem is in
alloc_heap_pages(), not __do_update_va_mapping().

~Andrew

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