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

[James Harper <JamesH@xxxxxxxxxxxxxxxx>]

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.