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Re: [Xen-devel] [xen-unstable test] 56759: regressions - FAIL



Hi,

On 02/06/2015 06:30, Jan Beulich wrote:
On 29.05.15 at 18:32, <ian.campbell@xxxxxxxxxx> wrote:
On Wed, 2015-05-27 at 17:04 +0100, Ian Campbell wrote:
Looking at the netback side though it seems like netback_remove is
switching to state=Closed _before_ it calls kobject_uevent(...,
KOBJ_OFFLINE) and it is this which generates the call to netback_uevent
which tries and fails to read script and produces the error message.

I've just sent out a patch which fixes this issue, although I am still
at a loss to explain why we have only started seeing this now and only
under such specific circumstances.

I'm still slightly concerned that perhaps the new spinlock stuff has
some sort of bad behaviour either on arndale specifically or more
generally for ARM systems which has pushed this particular case over the
edge.

I did run some benchmarks (hackbench+fio on arndale domU and hackbench
on midway dom0) with and without the ticket locks and the results were
close enough that I'm basically not too worried that there is something
wrong with the ticket locks on ARM.

It still niggles somewhat not to have a good theory about why this
change had this seemingly random effect, but I've not got any good ideas
for avenues to explore and I've got other things to do so I think I'll
leave it at that.

So should we then re-instate the ticket lock patches?

Any update on this?

Regards,

--
Julien Grall

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