Xen devel - May 2007 - Issues Related to GCC Compiler

We have seen domain save/restore/migration issues related to GCC
compiler on recent changesets.
 
1. xen-unstable tree (changset 15080)
* gcc 4.0.2 
Compiled with gcc 4.0.2, Xen rebooted AMD-V boxes during domain
restore/migrate.
* gcc 4.1.2
This version of GCC worked well with Xen. It did not cause any problem
so far.
 
2. xen-unstable staging tree (changeset 15172)
* gcc 4.0.2
Xen also failed (similar as changset 15080) on domain restore/migrate
using gcc 4.0.2
* gcc 4.1.2
worked well.
 
We have not pinned the changeset which is causing the problem. I believe
it should be one of the past 60+ changsets because changset 15017 worked
well with gcc 4.0.2. 
 
Thanks,
 
-Wei


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> We have not pinned the changeset which is causing the problem. I
> believe it should be one of the past 60+ changsets because changset
> 15017 worked well with gcc 4.0.2.
My bet would be 15035 -- would be great if you can confirm.

Thanks,
Ian

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I just tried different combinations. From domain migration''s
perspective (using localhost as source and target), gcc 4.0.2 and gcc 4.1.2 do
NOT have difference on changset 15034 and 15035. Four combinations have similar
results. Basically, the migration can not finish. I saw target guest co-exists
with source guest forever (see "xm list" below).
 
Anyway, these are preliminary results. I will try other change sets and
experiments to isolate the root cause. The problem reported by Stefan might be
relevant.
 
 
~ # xm list
Name                                      ID   Mem VCPUs      State   Time(s)
Domain-0                                   0   500     2     r-----     99.0
ExampleHVMDomain                           6   128     0     -bp---      0.0
migrating-ExampleHVMDomain                 5   128     1     ------     10.1
 

________________________________

From: Ian Pratt [mailto:Ian.Pratt@cl.cam.ac.uk]
Sent: Fri 5/25/2007 5:08 PM
To: Huang2, Wei; xen-devel@lists.xensource.com
Cc: ian.pratt@cl.cam.ac.uk
Subject: RE: [Xen-devel] Issues Related to GCC Compiler



> We have not pinned the changeset which is causing the problem. I
> believe it should be one of the past 60+ changsets because changset
> 15017 worked well with gcc 4.0.2.
My bet would be 15035 -- would be great if you can confirm.

Thanks,
Ian






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