Red Hat Bugzilla – Bug 621916
Host panic on cross-vendor migration (RHEL 5.5 guest)
Last modified: 2014-12-01 18:07:08 EST
Description of problem:
When migrating a RHEL5.5 HVM guest between two RHEL5.5 hosts the receiving host panic'd after seemingly successfully migrating the machine. That is I was watching xm list and after the memory of the guest was completely transferred was when the host panic'd
Version-Release number of selected component (if applicable):
Haven't tried again, but can if necessary...
Steps to Reproduce:
1. Setup hosts for migration
2. xm migrate rhel5-hvm-guest some.host
Successful migration no panic
The only caveat, which is a large one, is that the host we are migrating from is running an AMD processor and the host we are migrating to is an Intel. Regardless of supportability, I don't think the host should be panicing.
Access to vmcore and sosreports to follow.
Thanks, can you provide the sosreport for the guest too?
Alternatively, could you capture the serial console output on the receiving end? I'm almost sure this is a dup of bug 620490 (embargoed).
No, unfortunately that's a log of the kernel; I need a log of the hypervisor.
Considering cross-vendor migration isn't supported, I think this bug should either be dropped or at least lowered to priority to Tier2. What to other interested parties have to say about that?
Created attachment 476233 [details]
patch to avoid the panic
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release. Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5
Detailed testing feedback is always welcomed.
Reproduced the bug on kernel-xen-2.6.18-245.el5, after migrating a HVM guest from AMD x86_64 host to Intel x86_64 host, the Intel host crashed.
Verified the bug on kernel-xen-2.6.18-257.el5, after migrating a HVM guest from AMD x86_64 host to Intel x86_64 host, none of the hosts crashed. Migrating a HVM guest from Intel to AMD is also tested, none of the hosts crashed.
So change the Status to VERIFIED.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.