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xen-devel
Re: [Xen-devel] xen-2.0 20040910 problems
What network driver are you using? The sis900 driver has a message
similar to what you describe:
"NULL pointer encountered in Rx ring, skipping"
Looks like a path that isn't supposed to trigger, but the driver
writer notes som elatent bug(s) that perhaps Xen + high load triggers?
-- Keir
> A VM bug would account for the repeated glitch that I am running into.
> In domain0 the xenlinux ernel will eventaully enter an infinite loop of
> the same message. "null pointer encountered in RC ring. Skiping". (not a
> word for word copy, haven't captured via serial port yet).
>
> It appears that if I leave the xen-br0 interface mis-configured so that
> Domain-0 can NOT pass packets destined to other domains it triggers the
> bug much more quickly.
>
> This has happened to snapshots taken at the following dates: 20040905,
> 20040908, 20040909 and did NOT happen with snapshots at or prior to
> 20040903.
>
> Yes, I made certain in each case that all fo the kernels and libs were
> not infected by prior snapshot versions.(a side benifit of the .deb
> packages, when replaced by a new version, all of the old version files
> are deleted prior to the install fo the new version.)
>
> If you need any specific tests, traces, or information, please feel free
> to reply to me with testing instructions and parameters. :)
>
> Hope this helps!
>
> Brian
>
> On Sun, 2004-09-12 at 02:05, Ian Pratt wrote:
> > > I have been experimenting with xen 2.0 and before that with
> > > xeno-unstable. It
> > > has proved interesting and promising
> > >
> > > However, the last few updates have been problematic. In particular it
> > > looks as
> > > if the ext3 filesystem is not correctly handled.
> >
> > Can you give us an idea when it last worked reliably for you?
> >
> > > Recent history:
> > >
> > > 20040907: occasional kernel BUGs
> > > 20040908: instant reboot loop when booting xen
> > > 20040909: mysterious filesystem problems
> > > 20040910: mysterious filesystem problems
> >
> > I suspect that these are all a result of experiencing some
> > virtual memory bug.
> >
> > It's pretty odd, as we haven't seen any problems in our testing,
> > but its possible that our automated testing doesn't run enough
> > concurrent domains to tweak it.
> >
> > Can you tell us a bit more about your setup, e.g. SMP? Xeon or
> > Opteron?
> >
> > What are the other domains doing when 'rpm -qa' explodes?
> >
> > What version of libc are you using i.e. 'ldd /bin/rpm' ? (We've
> > never used mandrake, but I doubt this is significant)
> >
> > If you can narrow down to a simple to reproduce test case I'm
> > sure we can find and fix this.
> >
> > > On a different topic, I have never yet seen the web interface work for
> > > long
> > > enough to be useful - it always crashes with the int-text type clash that
> > > was
> > > mentioned somewhere in the changelogs as having been fixed.
> >
> > The web interface is very much a work-in-progress that we're
> > hoping other people will contribute on.
> >
> > Ian
> >
> >
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>
>
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