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Bug 1982224 - [RHEL9]qemu segfault after the 2rd postcopy live migration with vhost-user
Summary: [RHEL9]qemu segfault after the 2rd postcopy live migration with vhost-user
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: qemu-kvm
Version: 9.0
Hardware: x86_64
OS: Linux
high
high
Target Milestone: beta
: ---
Assignee: Juan Quintela
QA Contact: Pei Zhang
URL:
Whiteboard:
Depends On: 1981782 2021976 2021981 2024981 2025609
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-14 13:11 UTC by Pei Zhang
Modified: 2022-05-17 12:25 UTC (History)
8 users (show)

Fixed In Version: qemu-kvm-6.2.0-1.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1981782
Environment:
Last Closed: 2022-05-17 12:23:27 UTC
Type: ---
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Gitlab redhat/centos-stream/src qemu-kvm merge_requests 50 0 None None None 2021-11-10 10:33:11 UTC
Red Hat Product Errata RHBA-2022:2307 0 None None None 2022-05-17 12:23:56 UTC

Comment 1 Pei Zhang 2021-07-14 13:16:34 UTC 
Versions:
5.13.0-1.rt3.1.el9.x86_64
qemu-kvm-6.0.0-8.el9.x86_64
libvirt-7.4.0-1.el9.x86_64
openvswitch2.15-2.15.0-16.el9fdp.x86_64

Note:
Currently postcopy hit existed issue: Bug 1945420 - [RHEL9] Setup vm.unprivileged_userfaultfd for postcopy

The workaround is: execute below cmd on both src and des host before doing postcopy live migration.

# echo 1 >/proc/sys/vm/unprivileged_userfaultfd
Comment 2 John Ferlan 2021-07-22 18:45:50 UTC 
Meirav - keeping this and the cloned from bug together.
Comment 3 Juan Quintela 2021-11-10 10:19:45 UTC 
Hi Pei

This brew should fix the issue:

https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=41123115

Patch exist upstream, and merge request has been sent.

Could you try it?

Thanks, Juan.
Comment 4 Pei Zhang 2021-11-11 06:19:50 UTC 
(In reply to Juan Quintela from comment #3)
> Hi Pei
> 
> This brew should fix the issue:
> 
> https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=41123115
> 
> Patch exist upstream, and merge request has been sent.
> 
> Could you try it?

Juan, thank you providing this build. 

This bug cannot be reproduced this build, post copy live migration works well and no any error any more.

Versions:
qemu-kvm-6.1.0-6.el9.quintela202111091652.x86_64

Tested:
Testcase: live_migration_nonrt_server_2Q_1G_iommu_ovs_postcopy
PASS

Testcase: live_migration_nonrt_server_1Q_1G_iommu_ovs_postcopy
PASS

Testcase: live_migration_nonrt_server_4Q_1G_iommu_ovs_postcopy
PASS

Thanks.

Best regards,

Pei



> 
> Thanks, Juan.
Comment 5 Pei Zhang 2021-12-17 04:11:23 UTC 
Verification:

Versions:
qemu-kvm-6.2.0-1.el9.x86_64
libvirt-7.10.0-1.el9.x86_64
5.14.0-31.el9.x86_64
openvswitch2.15-2.15.0-33.el9fdp.x86_64
tuned-2.16.0-4.el9.noarch

vhost-user 1Q/2Q/4Q post copy live migration work well, no qemu crash and no any error any more.  


Testcase: live_migration_nonrt_server_2Q_1G_iommu_ovs_postcopy
PASS

Testcase: live_migration_nonrt_server_1Q_1G_iommu_ovs_postcopy
PASS

Testcase: live_migration_nonrt_server_4Q_1G_iommu_ovs_postcopy
PASS


So this bug has been fixed very well. Will move to Verified once ON_QA.
Comment 6 Yanan Fu 2021-12-20 12:44:35 UTC 
QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.
Comment 11 errata-xmlrpc 2022-05-17 12:23:27 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: qemu-kvm), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2307
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