Re: [Xen-devel] segfault in VM - FIXED!

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Looks like this is a very occasional failure, from the timestamps
between messages. If you make a debug buil dof Xen then we'll get some
info as to why the page transfer is failing.

 -- Keir

> I was running my diff script all night which itself reported no errors, but 
> this morning I have the following in dom0's kern.log:
> 
> Jul 25 21:53:58 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 25 23:02:49 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 25 23:31:25 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 01:07:55 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 01:38:59 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 02:35:21 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 02:47:33 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 04:55:37 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 06:32:56 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 06:59:22 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 08:00:19 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> Jul 26 08:24:50 xen1 kernel: (file=main.c, line=270) Failed MMU update 
> transferring to DOM2
> 
> and in dom2:
> 
> Jul 25 21:53:58 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 25 23:02:49 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 25 23:31:25 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 01:07:55 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 01:38:59 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 02:35:21 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 02:47:33 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 04:55:37 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 06:32:56 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 06:59:22 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 08:00:19 mail2 kernel: bad buffer on RX ring!(-1)
> Jul 26 08:24:50 mail2 kernel: bad buffer on RX ring!(-1)
> 
> so something funny is going on. i started my diff and ping scripts at about 
> 21:20. At least the above error is detected though.
> 
> James
> 
> 
> 
> From: Chris Andrews
> Sent: Mon 26/07/2004 1:08 AM
> To: James Harper
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] segfault in VM - FIXED!
> 
> 
> On 25 Jul 2004, at 12:24, James Harper wrote:
> 
> > so far so good. It's been running for a while now with no errors. much 
> > longer than it would have survived previously.
> 
> It's broken for me - I suspect it's that although it checks that 
> requests to be merged begin in the same page, it doesn't also check 
> they end in that same page. I'm testing a version now that tries to do 
> that.
> 
> Chris.
 -=- MIME -=- 
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        charset="iso-8859-1";
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I was running my diff script all night which itself reported no errors, but=
 this morning I have the following in dom0's kern.log:

Jul 25 21:53:58 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 25 23:02:49 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 25 23:31:25 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 01:07:55 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 01:38:59 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 02:35:21 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 02:47:33 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 04:55:37 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 06:32:56 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 06:59:22 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 08:00:19 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2
Jul 26 08:24:50 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update =
transferring to DOM2

and in dom2:

Jul 25 21:53:58 mail2 kernel: bad buffer on RX ring!(-1)
Jul 25 23:02:49 mail2 kernel: bad buffer on RX ring!(-1)
Jul 25 23:31:25 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 01:07:55 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 01:38:59 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 02:35:21 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 02:47:33 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 04:55:37 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 06:32:56 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 06:59:22 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 08:00:19 mail2 kernel: bad buffer on RX ring!(-1)
Jul 26 08:24:50 mail2 kernel: bad buffer on RX ring!(-1)

so something funny is going on. i started my diff and ping scripts at about=
 21:20. At least the above error is detected though.

James



From: Chris Andrews
Sent: Mon 26/07/2004 1:08 AM
To: James Harper
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] segfault in VM - FIXED!


On 25 Jul 2004, at 12:24, James Harper wrote:

> so far so good. It's been running for a while now with no errors. much=20
> longer than it would have survived previously.

It's broken for me - I suspect it's that although it checks that=20
requests to be merged begin in the same page, it doesn't also check=20
they end in that same page. I'm testing a version now that tries to do=20
that.

Chris.

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Content-Transfer-Encoding: quoted-printable

<HTML><HEAD></HEAD>
<BODY>
<DIV id=3DidOWAReplyText44056 dir=3Dltr>
<DIV dir=3Dltr><FONT face=3DArial color=3D#000000 size=3D2>I was running my=
 diff script all night which itself reported no errors, but this morning I =
have the following in dom0's kern.log:</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Jul 25 21:53:58 xen1 kernel: (fi=
le=3Dmain.c, line=3D270) Failed MMU update transferring to DOM2<BR>Jul 25 2=
3:02:49 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update transfer=
ring to DOM2<BR>Jul 25 23:31:25 xen1 kernel: (file=3Dmain.c, line=3D270) Fa=
iled MMU update transferring to DOM2<BR>Jul 26 01:07:55 xen1 kernel: (file=
=3Dmain.c, line=3D270) Failed MMU update transferring to DOM2<BR>Jul 26 01:=
38:59 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update transferri=
ng to DOM2<BR>Jul 26 02:35:21 xen1 kernel: (file=3Dmain.c, line=3D270) Fail=
ed MMU update transferring to DOM2<BR>Jul 26 02:47:33 xen1 kernel: (file=3D=
main.c, line=3D270) Failed MMU update transferring to DOM2<BR>Jul 26 04:55:=
37 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update transferring =
to DOM2<BR>Jul 26 06:32:56 xen1 kernel: (file=3Dmain.c, line=3D270) Failed =
MMU update transferring to DOM2<BR>Jul 26 06:59:22 xen1 kernel: (file=3Dmai=
n.c, line=3D270) Failed MMU update transferring to DOM2<BR>Jul 26 08:00:19 =
xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU update transferring to =
DOM2<BR>Jul 26 08:24:50 xen1 kernel: (file=3Dmain.c, line=3D270) Failed MMU=
 update transferring to DOM2<BR></FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>and in dom2:</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>Jul 25 21:53:58 mail2 kernel: ba=
d buffer on RX ring!(-1)<BR>Jul 25 23:02:49 mail2 kernel: bad buffer on RX =
ring!(-1)<BR>Jul 25 23:31:25 mail2 kernel: bad buffer on RX ring!(-1)<BR>Ju=
l 26 01:07:55 mail2 kernel: bad buffer on RX ring!(-1)<BR>Jul 26 01:38:59 m=
ail2 kernel: bad buffer on RX ring!(-1)<BR>Jul 26 02:35:21 mail2 kernel: ba=
d buffer on RX ring!(-1)<BR>Jul 26 02:47:33 mail2 kernel: bad buffer on RX =
ring!(-1)<BR>Jul 26 04:55:37 mail2 kernel: bad buffer on RX ring!(-1)<BR>Ju=
l 26 06:32:56 mail2 kernel: bad buffer on RX ring!(-1)<BR>Jul 26 06:59:22 m=
ail2 kernel: bad buffer on RX ring!(-1)<BR>Jul 26 08:00:19 mail2 kernel: ba=
d buffer on RX ring!(-1)<BR>Jul 26 08:24:50 mail2 kernel: bad buffer on RX =
ring!(-1)<BR></FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>so something funny is going on. =
i started my diff and ping scripts at about 21:20. At least the above error=
 is detected though.</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>James</FONT></DIV>
<DIV dir=3Dltr><FONT face=3DArial size=3D2>&nbsp;</DIV></FONT>
<DIV dir=3Dltr>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> Chris Andrews<BR><B>Sent:</B> Mon=
 26/07/2004 1:08 AM<BR><B>To:</B> James Harper<BR><B>Cc:</B> xen-devel@list=
s.sourceforge.net<BR><B>Subject:</B> Re: [Xen-devel] segfault in VM - FIXED=
!<BR></FONT><BR></DIV></DIV>
<DIV><PRE style=3D"WORD-WRAP: break-word">On 25 Jul 2004, at 12:24, James H=
arper wrote:

&gt; so far so good. It's been running for a while now with no errors. much=
=20
&gt; longer than it would have survived previously.

It's broken for me - I suspect it's that although it checks that=20
requests to be merged begin in the same page, it doesn't also check=20
they end in that same page. I'm testing a version now that tries to do=20
that.

Chris.

</PRE></DIV></BODY></HTML>

--_7B4740D2-5940-4EA9-8376-C62BADEDF385_--


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