Re: HVM hangs system on AMD A10-6800K + Hudson-D4

[George Dunlap <george.dunlap@eu.citrix.com>]

On 08/20/2013 09:26 AM, Jan Beulich wrote:
>>>> On 20.08.13 at 03:42, Darren Shepherd <darren.s.shepherd@gmail.com> wrote:
>> Okay, so I compiled, ran and tested everything between RELEASE-4.3.0 (bad)
>> with master (good).   Unfortunately I came to the conclusion it's not a patch
>> but instead it's the debug flag.  So if I build RELEASE-4.3.0 it fails my test
>> case because because Config.mk has "debug ?= n". If I then just rebuild
>> xen.gz with "make debug=y" it works.
>
> Pretty unusual - normally we'd expect more problems with debug=y
> (because of extra checking done), not less.

Unfortunately the kind of bug that changes when you add debugging is 
usually pretty difficult to track down: race conditions, clobbered 
variables...  nearly impossible without a serial console.

>
>> I'll keep fooling around and see if I can narrow this down any further.  So
>> my simple test fails with debug off, but I don't know if debug on just makes
>> it less likely to happen.  I'm going to run more extensive tests later.  I'll
>> also try to get a serial port setup on the box.
>
> I'm afraid that's the only viable route.
>
> Jan
>