Re: [Xen-devel] [xen-unstable test] 113562: regressions - FAIL

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Sep 18, 2017 at 11:15:03AM +0100, George Dunlap wrote:
> On 09/18/2017 10:45 AM, Roger Pau Monné wrote:
> > On Mon, Sep 18, 2017 at 10:37:58AM +0100, Wei Liu wrote:
> >> On Mon, Sep 18, 2017 at 08:36:03AM +0000, osstest service owner wrote:
> >>> flight 113562 xen-unstable real [real]
> >>> http://logs.test-lab.xenproject.org/osstest/logs/113562/
> >>>
> >>> Regressions :-(
> >>>
> >>> Tests which did not succeed and are blocking,
> >>> including tests which could not be run:
> >>>  test-amd64-amd64-xl-credit2  15 guest-saverestore        fail REGR. vs. 
> >>> 113387
> >>
> >> There appears to be a bug:
> >>
> >> http://logs.test-lab.xenproject.org/osstest/logs/113562/test-amd64-amd64-xl-credit2/serial-godello0.log
> >>
> >> Sep 18 01:14:28.803062 (XEN) Xen BUG at spinlock.c:47
> > 
> > Seem to be caused because budget_lock is sometimes locked with irqsave
> > while others not.
> 
> Just wondering where you're getting the budget lock from?  The call
> stack in that link makes it look like it's the RCU clean-up triggering a
> domain destroy.  (Haven't looked deeper into the specific line numbers.)
> 

Looking at the backtrace I am not sure yet if budget_lock is the
culprit.

But, Xen does have a requirement to distinguish IRQ-safe lock and
IRQ-unsafe lock. The budget_lock violates that rule.

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