Re: [Xen-devel] [linux-4.1 test] 63030: regressions - FAIL

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2015-10-21 at 10:24 +0100, Wei Liu wrote:
> On Wed, Oct 21, 2015 at 10:04:14AM +0100, Ian Campbell wrote:
> > On Tue, 2015-10-20 at 16:24 +0100, Wei Liu wrote:
> > > But this is only code inspection,  so I'm not very confident whether
> > > everything does what it says it does.
> > 
> > Right,. I think this one probably needs someone to setup a system in a
> > similar configuration and play with it.
> > 
> 
> Is there an easy way to do that? Say, give me some runes so that I can
> lock a machine in Cambridge instance, run the failing test case.

I could[0] but, why can't you just set things up on your existing test
hosts, either using standalone mode or by just installing the guest by
hand?

That's what I would do (probably the latter) in the first instance. It's
very likely IME that you are going to need to poke at this interactively
while debugging and to run repeated migrations etc to trigger the issue.
IMHO trying to use osstest for such manual debugging is just going to get
in the way.

> > xen-netfront.c calls netdev_notify_peers (nÃe netif_notify_peers). I
> > seem
> > to vaguely recall that setting some sysctl (arp_notify?) can be
> > required to
> > allow that to actually do anything but I think that has been fixed i.e.
> > NETDEV_NOTIFY_PEERS is unconditional in inetdev_event() and only
> > NETDEV_CHANGEADDR is gated.
> > 
> 
> Found your patch posted in 2011.
> 
> https://patchwork.ozlabs.org/patch/82813/
> 
> I think you're right and the said behaviour exists in Wheezy's 3.2
> kernel.

This ended up as d11327ad6695db8117c78d70611e71102ceec2ac and:

$ git describe --contains d11327ad6695db8117c78d70611e71102ceec2ac
v2.6.38-rc6~20^2~10

...suggests this was in mainline long before 3.2.

Ian.

[0] ./mg-allocate -U <timespan> <machine-name>
Where timespan is digits followed by d (for days), h (for hours) etc.

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