Re: [Xen-devel] [xen-unstable test] 110009: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.06.17 at 21:19, <sstabellini@xxxxxxxxxx> wrote:
> On Tue, 6 Jun 2017, Jan Beulich wrote:
>> >>> On 06.06.17 at 16:00, <ian.jackson@xxxxxxxxxxxxx> wrote:
>> > Looking at the serial logs for that and comparing them with 10009,
>> > it's not terribly easy to see what's going on because the kernel
>> > versions are different and so produce different messages about xenbr0
>> > (and I think may have a different bridge port management algorithm).
>> > 
>> > But the messages about promiscuous mode seem the same, and of course
>> > promiscuous mode is controlled by userspace, rather than by the kernel
>> > (so should be the same in both).
>> > 
>> > However, in the failed test we see extra messages about promis:
>> > 
>> >   Jun  5 13:37:08.353656 [ 2191.652079] device vif7.0-emu left promiscuous 
>> > mode
>> >   ...
>> >   Jun  5 13:37:08.377571 [ 2191.675298] device vif7.0 left promiscuous mode
>> 
>> Wouldn't those be another result of the guest shutting down /
>> being shut down?
>> 
>> > Also, the qemu log for the guest in the failure case says this:
>> > 
>> >   Log-dirty command enable
>> >   Log-dirty: no command yet.
>> >   reset requested in cpu_handle_ioreq.
>> 
>> So this would seem to call for instrumentation on the qemu side
>> then, as the only path via which this can be initiated is - afaics -
>> qemu_system_reset_request(), which doesn't have very many
>> callers that could possibly be of interest here. Adding Stefano ...
> 
> I am pretty sure that those messages come from qemu traditional: "reset
> requested in cpu_handle_ioreq" is not printed by qemu-xen.

Oh, indeed - I didn't pay attention to this being a *-qemut-*
test. I'm sorry.

> In any case, the request comes from qemu_system_reset_request, which is
> called by hw/acpi.c:pm_ioport_writew. It looks like the guest OS
> initiated the reset (or resume)?

Right, this and hw/pckbd.c look to be the only possible
sources. Yet then it's still unclear what makes the guest go
down.

Jan


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