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Bug 1586278 - Unable to boot RHEL 6 guests running kernel 2.6.32-696.30.1.el6.x86_64 with Opteron G4 / G5 CPU types
Summary: Unable to boot RHEL 6 guests running kernel 2.6.32-696.30.1.el6.x86_64 with O...
Keywords:
Status: CLOSED DUPLICATE of bug 1580360
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.5
Hardware: Unspecified
OS: Unspecified
unspecified
high
Target Milestone: rc
: ---
Assignee: Hai Huang
QA Contact: Guo, Zhiyi
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-06-05 21:00 UTC by amashah
Modified: 2021-09-09 14:25 UTC (History)
13 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-06-07 16:13:25 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description amashah 2018-06-05 21:00:24 UTC 
Description of problem:

Unable to boot RHEL 6 virtual guest with Opteron_G4 or Opteron_G5 CPU type with the latest RHEL 6 guest kernel (2.6.32-696.30.1.el6.x86_64).

Host machine is latest RHEL 7.5, fully updated.

When trying to boot up a RHEL 6 guest with the latest RHEL 6 kernel, this error messages shows up after the GRUB menu screen in virt-viewer:

PANIC: early exception 0d rip 10:ffffffff810462b6 error 0 cr2 0

and the guest OS won't boot up at all.

This does not happen when booting up with the previous 2.6.32-696.28.1.el6.x86_64 kernel.

Using Opteron_G3 seems to work just fine, but using Opteron_G4 and Opteron_G5 prevents the RHEL 6 VM from booting up. This only happens with RHEL 6 guests. RHEL 7 guests work just fine with Opteron_G4 or Opteron_G5 CPU type with the latest RHEL 7 kernel.


Version-Release number of selected component (if applicable):

RHEL 7 host machine running latest libvirt and qemu-kvm:

[root@host ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.5 (Maipo)

[root@host ~]# rpm -qa | grep -e libvirt -e qemu
libvirt-libs-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-secret-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-logical-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-kvm-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-nwfilter-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-rbd-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-config-network-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-network-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-qemu-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-mpath-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-iscsi-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-config-nwfilter-3.9.0-14.el7_5.5.x86_64
qemu-kvm-common-1.5.3-156.el7_5.2.x86_64
libvirt-python-3.9.0-1.el7.x86_64
libvirt-daemon-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-core-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-nodedev-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-gluster-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-3.9.0-14.el7_5.5.x86_64
libvirt-client-3.9.0-14.el7_5.5.x86_64
libvirt-3.9.0-14.el7_5.5.x86_64
qemu-img-1.5.3-156.el7_5.2.x86_64
libvirt-daemon-driver-storage-scsi-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-lxc-3.9.0-14.el7_5.5.x86_64
ipxe-roms-qemu-20170123-1.git4e85b27.el7_4.1.noarch
libvirt-daemon-driver-interface-3.9.0-14.el7_5.5.x86_64
libvirt-daemon-driver-storage-disk-3.9.0-14.el7_5.5.x86_64
qemu-kvm-1.5.3-156.el7_5.2.x86_64


How reproducible:

Every time RHEL 6 guest boots up using latest RHEL 6 kernel and Opteron_G4 or Opteron_G5 CPU type.


Steps to Reproduce:
1. Install RHEL 6 guest on RHEL 7.5 host
2. Select Opteron_G4 or Opteron_G5 CPU type
3. Update RHEL 6 to latest kernel
4. Try to boot

Actual results:

Doesn't boot

Expected results:

Should boot

Additional info:

Specifying the CPU type is necessary in order to also specify the ibpb CPU feature flag for the guests in order for them to be protected from Spectre v2 vulnerability.
Comment 3 Yanan Fu 2018-06-06 02:18:34 UTC 
Hi all,

This issue is duplicate with 1580360.
It already be fixed and backport to 6.4.z, 6.5.z, 6.6.z and 6.7.z, Z stream bz already be verified too.
Comment 4 Yanan Fu 2018-06-06 02:20:09 UTC 
duplicate with bz 1580360
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