RE: [Xen-devel] refcount errors then crash on XenoLinux with the latest source

["Neugebauer, Rolf" <rolf.neugebauer@xxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Kip Macy
> Sent: 23 February 2004 21:03
> To: Ian Pratt
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] refcount errors then crash on XenoLinux with the
> latest source
>=20
> I had just tested my domain builder for the nth time on xeno-unstable
> (very latest source), when I saw the messages below on the console.
> DOM0 no longer responds to ping - I'm hoping that it will recover,

That is normal if you do an audit of all pages. Interrupts are disabled
for the whole time and you are basically trawling the entire frametable
twice, which can take some time depending on your memory size.

> however, in all likelihood I will be hitting the rpb in a few minutes.
>=20
> audit_all_pages
> zombie: pfn=3D00000000 cf=3Dfffffffd tf=3Dfffffffd dom=3D00000000
> refcount error: pfn=3D000000 cf=3Dfffffffd refcount=3D1
> audit page: pfn=3D0 info: cf=3Dfffffffd tf=3Dfffffffd ts=3D0 dom=3D0

This one is odd, I think. At least I haven't seen it before.

> refcount error: pfn=3D000247 cf=3D00000001 refcount=3D0
> audit page: pfn=3D247 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc648040
>=20
> refcount error: pfn=3D00024d cf=3D00000001 refcount=3D0
> audit page: pfn=3D24d info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc648040

These are expected. They are used for comms rings.

The rest all indicate an error of some sort. The first three have a
mapping but their ref count is wrong.

I don't know the bitmasks for the type and the top of my head but I can
have a look tomorrow.

If it helps, I also have some more debug code which allows a domain to
get the pfn_info from Xen for a given page. I could send you a patch
against unstable again tomorrow.

Rolf

> refcount error: pfn=3D00036f cf=3D40000002 refcount=3D1
> audit page: pfn=3D36f info: cf=3D40000002 tf=3Df0000002 ts=3D0 =
dom=3Dfc648be0
>   pte_pfn=3D002207 cf=3D10000026 tf=3D30000024 dom=3Dfc648be0
>     pte_idx=3D3f9 *pte_idx=3D0036f063
>=20
> refcount error: pfn=3D000371 cf=3D40000002 refcount=3D1
> audit page: pfn=3D371 info: cf=3D40000002 tf=3Df0000002 ts=3D0 =
dom=3Dfc648be0
>   pte_pfn=3D002207 cf=3D10000026 tf=3D30000024 dom=3Dfc648be0
>     pte_idx=3D3fe *pte_idx=3D00371063
>=20
> refcount error: pfn=3D000372 cf=3D40000002 refcount=3D1
> audit page: pfn=3D372 info: cf=3D40000002 tf=3Df0000002 ts=3D0 =
dom=3Dfc648be0
>   pte_pfn=3D002207 cf=3D10000026 tf=3D30000024 dom=3Dfc648be0
>     pte_idx=3D3fd *pte_idx=3D00372063
>=20
> refcount error: pfn=3D000390 cf=3D00000001 refcount=3D0
> audit page: pfn=3D390 info: cf=3D1 tf=3Df0000001 ts=3D4ddca =
dom=3Dfc649780
>=20
> refcount error: pfn=3D000392 cf=3D00000001 refcount=3D0
> audit page: pfn=3D392 info: cf=3D1 tf=3Df0000001 ts=3D4ddca =
dom=3Dfc649780
>=20
> refcount error: pfn=3D000393 cf=3D00000001 refcount=3D0
> audit page: pfn=3D393 info: cf=3D1 tf=3Df0000001 ts=3D4ae4c =
dom=3Dfc64a320
>=20
> refcount error: pfn=3D000395 cf=3D00000001 refcount=3D0
> audit page: pfn=3D395 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc64a320
>=20
> refcount error: pfn=3D00039f cf=3D00000001 refcount=3D0
> audit page: pfn=3D39f info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc64aec0
>=20
> refcount error: pfn=3D0003a1 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3a1 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc64aec0
>=20
> refcount error: pfn=3D0003a2 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3a2 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a4060
>=20
> refcount error: pfn=3D0003a8 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3a8 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a4060
>=20
> refcount error: pfn=3D0003a9 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3a9 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a4c00
>=20
> refcount error: pfn=3D0003ab cf=3D00000001 refcount=3D0
> audit page: pfn=3D3ab info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a4c00
>=20
> refcount error: pfn=3D0003ac cf=3D00000001 refcount=3D0
> audit page: pfn=3D3ac info: cf=3D1 tf=3Df0000001 ts=3D191ab3 =
dom=3Dfc7a57a0
>=20
> refcount error: pfn=3D0003ae cf=3D00000001 refcount=3D0
> audit page: pfn=3D3ae info: cf=3D1 tf=3Df0000001 ts=3D191ab3 =
dom=3Dfc7a57a0
>=20
> refcount error: pfn=3D0003af cf=3D00000001 refcount=3D0
> audit page: pfn=3D3af info: cf=3D1 tf=3Df0000001 ts=3D191ab2 =
dom=3Dfc7a6340
>=20
> refcount error: pfn=3D0003b1 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3b1 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a6340
>=20
> refcount error: pfn=3D0003b2 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3b2 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a6ee0
>=20
> refcount error: pfn=3D0003b4 cf=3D00000001 refcount=3D0
> audit page: pfn=3D3b4 info: cf=3D1 tf=3Df0000001 ts=3D0 dom=3Dfc7a6ee0
>=20
>=20
>=20
>=20
>=20
>=20
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