Bug 1078775

Summary:	During query cpuinfo during guest boot from ipxe repeatedly in AMD hosts, vm repeatedly reboot.
Product:	Red Hat Enterprise Linux 7	Reporter:	Qian Guo <qiguo>
Component:	kernel	Assignee:	Paolo Bonzini <pbonzini>
kernel sub component:	KVM	QA Contact:	Virtualization Bugs <virt-bugs>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	medium
Priority:	urgent	CC:	hhuang, juzhang, knoel, lersek, michen, pbonzini, rbalakri, virt-maint
Version:	7.0	Keywords:	Regression
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	kernel-3.10.0-143.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 11:43:03 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:	1088784, 1116936
Bug Blocks:

Description Qian Guo 2014-03-20 10:11:23 UTC

Description of problem:
Start qemu and in meantime query cpuinfo repeatedly, when qemu try to boot from ipxe, vm then reboot repeatedly

Version-Release number of selected component (if applicable):
# uname -r
3.10.0-111.el7.x86_64
# rpm -q qemu-kvm-rhev
qemu-kvm-rhev-1.5.3-53.el7.x86_64
# rpm -q seabios
seabios-1.7.2.2-12.el7.x86_64
# rpm -qa |grep pxe
ipxe-roms-qemu-20130517-5.gitc4bce43.el7.noarch

How reproducible:
100%

Steps to Reproduce:
1.Launch qemu and before vm boots, query cpuinfo repeatedly
# while true; do echo "info cpus" |nc -U /tmp/m1 ; done

# /usr/libexec/qemu-kvm -cpu Opteron_G3 -m 4G -smp 4 -M pc -enable-kvm -name testovs  -nodefaults -nodefconfig -monitor stdio -spice port=5900,disable-ticketing -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 -vga qxl -boot menu=on -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -monitor stdio -qmp unix:/tmp/q1,server,nowait -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:11:23:a1  -monitor unix:/tmp/m1,server,nowait

2.
3.

Actual results:
vm try to boot from ipxe, but then reboot immediately and repeatedly.

Expected results:
Vm can successfully access the ipxe installation.

Additional info:

Comment 8 Jarod Wilson 2014-08-07 20:54:36 UTC

Patch(es) available on kernel-3.10.0-143.el7

Comment 11 Qian Guo 2014-11-05 09:15:08 UTC

Reproduced this bug with kernel-3.10.0-142.el7.x86_64

steps:
1.Boot guest in amd host:
# /usr/libexec/qemu-kvm -cpu Opteron_G3 -m 4G -smp 4 -M pc -enable-kvm -name pxe  -nodefaults -nodefconfig -monitor stdio -spice port=5900,disable-ticketing -global qxl-vga.ram_size=67108864 -global qxl-vga.vram_size=67108864 -vga qxl -boot menu=on -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -monitor stdio -qmp unix:/tmp/q1,server,nowait -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:11:23:a1  -monitor unix:/tmp/m1,server,nowait   -S

2.query vcpus repeatedly 
# while true; do echo "info cpus" |nc -U /tmp/m1 ; done

3.Start qemu.

Result: vm try to boot from ipxe, but then reboot immediately and repeatedly.

So this bug is reproduced.


Verify this bug with kernel-3.10.0-197.el7.x86_64 combined with qemu-kvm-1.5.3-77.el7.x86_64 and also with qemu-kvm-rhev-2.1.2-6.el7.x86_64

Steps as above, result: guest can continue to boot but not repeatedly reboot from ipxe.


So this bug is verified.

Comment 13 errata-xmlrpc 2015-03-05 11:43:03 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, 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://rhn.redhat.com/errata/RHSA-2015-0290.html