Upstream patch at

http://permalink.gmane.org/gmane.comp.emulators.qemu/273522

kvm.c and machine.c hunks only.

Fix included in qemu-kvm-1.5.3-76.el7

(In reply to Paolo Bonzini from comment #2)
> Upstream patch at
> 
> http://permalink.gmane.org/gmane.comp.emulators.qemu/273522
> 
> kvm.c and machine.c hunks only.

Hi, Paolo

How to verify this qemu-kvm bug, since if just test the original scenario, it is only kernel bug as bug 1088784 , with unfixed kernel(and any qemu builds), the original bug can be reproduced.

So if to verify the qemu-kvm side (bug 1088784 comment 17), do we need check something, could you help provide some suggestion?

Thanks

Hi Qian, you need to test it together with a fixed kernel, as suggested by the "depends on bug 1088784" in this BZ.

Test this bug with kernel-3.10.0-196.el7.x86_64 and qemu-kvm-1.5.3-77.el7.x86_64

steps:
1.# /usr/libexec/qemu-kvm -cpu Penryn -m 4G -smp 4,sockets=1,cores=4,threads=1 -M pc -enable-kvm  -device piix3-usb-uhci,id=usb -name rhel7 -nodefaults -nodefconfig  -device virtio-balloon-pci,id=balloon0  -vnc :10 -vga std -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0   -monitor stdio     -drive file=test,if=none,media=disk,format=raw,rerror=stop,werror=stop,aio=native,id=scsi-disk0 -device virtio-scsi-pci,id=bus2 -device scsi-hd,bus=bus2.0,drive=scsi-disk0,id=disk0 -netdev tap,id=netdev0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=netdev0,id=vn1,mac=52:54:a0:0b:00:01 -boot menu=on -monitor unix:/tmp/m1,server,nowait -S


2.In host, query vcpu via hmp,
# while true; do echo "info cpus" |nc -U /tmp/m1 ; done 

Result, guest can continue to boot, and did not hit the crash.


And test with kernel-3.10.0-196.el7.x86_64 and qemu-kvm-rhev-2.1.2-6.el7.x86_64, can get same result as qemu-kvm-1.5.3-77.el7.x86_64.

So this bug is verified.

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-2015-0349.html