[Xen-devel] RE: kernel BUG at arch/x86/xen/mmu.c:1860!

[MaoXiaoyun <tinnycloud@xxxxxxxxxxx>]

HI:
 
     As I go through the code with log, I noticed that  the log:
(XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
 
is from xen/common/grant_table.c:266, which is in function _set_status_v1()
so it looks like kernel 2.6.32 use grant table version 1.
 
While in 2.6.31. driver/xen/grant-table.c, I noticed function gnttab_request_version()
which looks like 2.6.31 require grant version 2. But this function cannot be found
in 2.6.32.
 
Is this correct?
 
Thanks.
 
 
>--------------------------------------------------------------------------------
>From: tinnycloud@xxxxxxxxxxx
>To: xen-devel@xxxxxxxxxxxxxxxxxxx
>CC: dave@xxxxxxxxxx; ian.campbell@xxxxxxxxxx; giamteckchoon@xxxxxxxxx; konrad.wilk@xxxxxxxxxx; jeremy@xxxxxxxx
>Subject: Re: kernel BUG at arch/x86/xen/mmu.c:1860!
>Date: Fri, 8 Apr 2011 19:24:35 +0800
>
>Hi:
>     Unfortunately I met the exactly same bug today. With pvops kernel 2.6.32.36, and xen 4.0.1.
>     Kernel Panic and serial log attached.
>
>     Our test cases is quite simple, on a single phys ical host, we start 12 HVMS(windows 2003),
>each of the HVM reboot every 10minutes.
>
>     The bug is easy to hit on our 48G machine(in hours). But We haven't hit the bug in our 24G
>machine(we have three 24G machine, all works fine.)  -----Is is possible related to Memory capacity?
>
>Taking a look at the serial output,  the Dom0 code is attempting to pin what it thins
>is a "PGT_l3_page_table", however the hypervisor returns -EINVAL because it actually  is a "PGT_writable_page".
>
>(XEN) mm.c:2364:d0 Bad type (saw 7400000000000001 != exp 4000 0000 0000 0000) for mfn 898a41 (pfn 9ca41)
>(XEN) mm.c:2733:d0 Error while pinning mfn 898a41
>
>And  before that quite a lot abnormal grant table log like :
>
>(XEN) grant_table.c:1717:d0 Bad grant reference 4294965983
>(XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
>( XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
>(XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
>(XEN) grant_table.c:1717:d0 Bad grant reference 4294965888
>(XEN) grant_table.c:1717:d0 Bad grant reference 4294965983
>
>It looks like something wrong with grant table.
>
>Many thanks.
>
>> From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
>> Subject: Re: [Xen-devel] [SPAM] Re: kernel BUG at
>> arch/x86/xen/mmu.c:1860! - ideas.
>> To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
>> Cc: Dave Hunter <dave@xxxxxxxxxx>, Teck Choon Giam
>> <giamteckchoon@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx"
>> xen-devel@xxxxxxxxxxxxxxxxxxx
>
>> On 04/06/2011 12:53 AM, Ian Campbell wrote:
>> > Please don't top post.
>> >
>> > On Wed, 2011-04-06 at 00:20 +0100, Dave Hunter wrote:
>> >> Is it likely that Debian would release an updated kernel in squeeze with
>> >> this configuration? (sorry, this might not be the place to ask).
>> > I doubt they will, enabling DEBUG_PAGEALLOC seems very much like a
>> > workaround not a solution to me.
>>
>> Yes, it will impose a pretty large performance overhead.
>>
>> J
>>
>>
>

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