Fix included in qemu-kvm-rhev-2.6.0-28.el7_3.1

Hi Qunfang,

there are issues with build target configuration. Package with fix should be qemu-kvm-rhev-2.6.0-28.el7_3.1. As soon as target is fixed, I'll build correct version.

Version -28 added some arm only fixes so it wasn't released for x86_64/ppc64. However, we will keep -28 for z-stream instead of -27.

Mirek

Hi, Mirek

Got it, Thanks for the information.

Bug reproduced:

This bug has been reproduced in PPC platform.

Version-Release number of selected component (if applicable):
Host:
kernel:3.10.0-514.el7.ppc64le
qemu-kvm-rhev-2.6.0-20.el7.ppc64le
SLOF-20160223-6.gitdbbfda4.el7
Guest:
3.10.0-514.el7.ppc64le

Steps to Reproduce:

1. This production is in single one host,ie.,the src=dst.
Boot a vm with qemu cli in ppc64le host,the full cli is as "Additional info",then, boot another vm in same host with same cli as first one and appending "-incoming tcp:0:5801"
     
2. Run "test" which is a program in guest that make memory intensive and can produce dirty pages during migration,the detail of program is as "Additional info".
#gcc test.c -o test
#./test

3. Set migration configuration in HMP and do migration
(qemu) migrate_set_speed 10
(qemu) migrate_set_capability xbzrle on
(qemu) migrate_set_capability postcopy-ram on
(qemu) migrate -d tcp:127.0.0.1:5801

4. Check migration status, after producing dirty pages switch to post-copy.
(qemu) info migrate
capabilities: xbzrle: on rdma-pin-all: off auto-converge: off zero-blocks: off compress: off events: off postcopy-ram: on
dirty sync count: 8
dirty pages rate: 5650 pages
.......other info....
(qemu) migrate_start_postcopy


Actual results:

The migration fails and the VM gets paused.
In src HMP:
(qemu) 2016-12-05T08:48:52.199109Z qemu-kvm: RP: Sibling indicated error 1
2016-12-05T08:48:52.279863Z qemu-kvm: socket_writev_buffer: Got err=104 for (32768/18446744073709551615)
(qemu) info status
VM status: paused (postmigrate)
(qemu) info migrate
capabilities: xbzrle: on rdma-pin-all: off auto-converge: off zero-blocks: off compress: off events: off postcopy-ram: on 
Migration status: failed
total time: 0 milliseconds
While in dst HMP:
(qemu) 2016-12-05T08:48:52.157951Z qemu-kvm: Unknown combination of migration flags: 0x40 (postcopy mode)
2016-12-05T08:48:52.158039Z qemu-kvm: error while loading state section id 2(ram)
2016-12-05T08:48:52.158049Z qemu-kvm: postcopy_ram_listen_thread: loadvm failed: -22

Additional info:
(1)the full qemu cli:
/usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1'  \
    -sandbox off  \
    -nodefaults  \
    -machine pseries-rhel7.3.0 \
    -vga std  \
    -device virtio-serial-pci,id=virtio_serial_pci0,bus=pci.0,addr=03 \
    -device virtio-scsi-pci,id=scsi1,bus=pci.0,addr=0x4 \
    -device ich9-usb-ehci1,id=usb1,addr=1d.7,multifunction=on,bus=pci.0 \
    -chardev socket,id=console0,path=/tmp/console0,server,nowait \
    -device spapr-vty,chardev=console0 \
    -chardev socket,id=console1,path=/tmp/console1,server,nowait \
    -device spapr-vty,chardev=console1 \
    -drive file=/root/R1.qcow2,if=none,id=blk1 \
    -device virtio-blk-pci,scsi=off,drive=blk1,id=blk-disk1,bootindex=1 \
    -device virtio-net-pci,mac=9a:7b:7c:7d:7e:71,id=idtlLxAk,vectors=4,netdev=idlkwV8e,bus=pci.0,addr=05 \
    -netdev tap,id=idlkwV8e,vhost=on,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown \
    -m 4096 \
    -smp 4 \
    -cpu host \
    -device usb-kbd \
    -device usb-mouse \
    -qmp tcp:0:8881,server,nowait \
    -vnc :1  \
    -msg timestamp=on \
    -rtc base=localtime,clock=vm,driftfix=slew  \
    -boot order=cdn,once=c,menu=off,strict=off \
    -monitor stdio \
    -enable-kvm
(2)the program that specified in step 2
#gcc test.c -o test
#./test
#cat test.c
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
int main()
{
void wakeup();
signal(SIGALRM,wakeup);
alarm(120);
char *buf = (char *) calloc(40960, 4096);
while (1) {
int i;
for (i = 0; i < 40960 * 4; i++) {
buf[i * 4096 / 4]++;
}
printf(".");
}
}
void wakeup()
{
exit(0);
}

Bug verify
Bug is verified pass both in ppc64le and x86 with qemu-kvm-rhev-2.6.0-28.el7_3.1
Bug is verified in ppc version:
Host:
3.10.0-514.el7.ppc64le
qemu-kvm-rhev-2.6.0-28.el7_3.1.ppc64le
SLOF-20160223-6.gitdbbfda4.el7
Guest:
3.10.0-514.el7.ppc64le

steps:
the same as bug reproduced.

Actual results:
The migration successed and the VM is running
In src HMP:
(qemu) info migrate
capabilities: xbzrle: on rdma-pin-all: off auto-converge: off zero-blocks: off compress: off events: off postcopy-ram: on 
Migration status: completed
dirty sync count: 7
postcopy request count: 15
In dst HMP:
(qemu) info status
VM status: running

Bug is verified in x86 version:
Host:
3.10.0-514.el7.x86_64
qemu-kvm-rhev-2.6.0-28.el7_3.1.x86_64
Guest:
3.10.0-514.el7.x86_64

steps:
the same as bug reproduced.

Actual results:
The migration successed and the VM is running
In src HMP:
(qemu) info migrate
capabilities: xbzrle: on rdma-pin-all: off auto-converge: off zero-blocks: off compress: off events: off postcopy-ram: on 
Migration status: completed
dirty sync count: 4
postcopy request count: 46
In dst HMP:
(qemu) info status
VM status: running

So, this bug is verified, it should be changed status to verified.

Setting to VERIFIED according to comment 7.

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/RHBA-2017-0115.html