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Re: [Xen-devel] HVM hangs system on AMD A10-6800K + Hudson-D4

On 08/20/2013 09:26 AM, Jan Beulich wrote:
On 20.08.13 at 03:42, Darren Shepherd <darren.s.shepherd@xxxxxxxxx> 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.


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