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Bug 1745449

Summary: L2 guest hit kernel panic when do L1->L1 live migration on intel host
Product: Red Hat Enterprise Linux Advanced Virtualization Reporter: Li Xiaohui <xiaohli>
Component: qemu-kvmAssignee: Paolo Bonzini <pbonzini>
Status: CLOSED DUPLICATE QA Contact: Li Xiaohui <xiaohli>
Severity: unspecified Docs Contact:
Priority: high    
Version: 8.1CC: bdas, chayang, hhuang, jinzhao, juzhang, knoel, leidwang, pbonzini, rbalakri, ribarry, rkrcmar, virt-maint, vkuznets
Target Milestone: rcFlags: knoel: mirror+
Target Release: 8.0   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: 1738741 Environment:
Last Closed: 2019-09-27 12:46:12 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1738741, 1749495    
Bug Blocks:    
Attachments:
Description Flags
vmcore-dmesg.txt none

Comment 1 Li Xiaohui 2019-08-26 07:33:54 UTC 
Created attachment 1608019 [details]
vmcore-dmesg.txt
Comment 2 Li Xiaohui 2019-08-26 08:23:02 UTC 
Test on host(kernel-4.18.0-137.el8.x86_64&qemu-img-4.1.0-4.module+el8.1.0+4020+16089f93.x86_64), reproduce this issue.

vmcore log is some different from slow train bz : Bug 1738741, so attach vmcore again, please see link:
http://fileshare.englab.nay.redhat.com/pub/section2/images_backup/bz1745449/
Comment 5 Li Xiaohui 2019-08-27 05:03:49 UTC 
I test on two amd hosts(both are AMD EPYC 7251 8-Core Processor), migrate L1->L1 from src to dst host, migration finish successfully, L2&L1 all work well. So seems this bz didn't reproduce on two hosts

now have no twin intel hosts for test, will try it after hosts are available.
Comment 6 Li Xiaohui 2019-09-03 12:15:36 UTC 
Hi Karen, Paolo,
Update Comment5:
1.On amd host, do local migration or live migration(both are AMD EPYC 7251 8-Core Processor), migration finished successfully, and L1&L2 work well, too. 
2.On intel twins host, do live migration(both are Intel(R) Xeon(R) CPU E3-1225 v5), migration finished succuessfully, but L2 guest hit kernel panic and produce vmcore file

So seems get conclusion:
On amd host, won't hit this issue, but on intel host, whether local migration or live migration, all L2 guest will hit kernel panic.
Comment 7 Paolo Bonzini 2019-09-27 12:46:12 UTC 

*** This bug has been marked as a duplicate of bug 1738741 ***