Re: [Xen-devel] 4.11.0 RC1 panic

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.06.18 at 22:55, <bouyer@xxxxxxxxxxxxxxx> wrote:
> On Tue, Jun 12, 2018 at 05:38:45PM +0200, Manuel Bouyer wrote:
>> On Tue, Jun 12, 2018 at 01:39:05PM +0200, Manuel Bouyer wrote:
>> > I applied this patch to 4.11rc4 (let's not change too much things at the
>> > same time) and rebooted my test host. Hopefully I'll have some data to 
>> > report
>> > soon
>> 
>> Got the first panic (still from a i386 domU):
> 
> I got another panic, possibly at domain shutdown. But it seems that not
> all messages from the console made it to the serial port (some Xen internal
> buffer overflow ?).

That's what my remark regarding buffer sizes was about: You need to
make sure they're large enough (via command line options). Or you
may want to run with "sync_console", assuming that at least the
shutdown variant of the issue does not get affected timing wise to a
degree where it's not reproducible anymore.

> Attached is the trace from serial console, the first
> 2 lines are from the NetBSD dom0 kernel, indicating vbds for domain 6 being
> detached (probably at shutdown of dom6).

Yeah, sadly this is of little use with some messages dropped in the middle
(and especially very close to the assertion actually having hit).

But from both this and the earlier (non-shutdown) instance you've sent
I see that I should replace/suppress further assertions, which now
trigger signaling just the same problem that the already replaced one
did.

Jan



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