Bug 622356

Summary: Live migration failed during reboot due to vhost
Product: Red Hat Enterprise Linux 6 Reporter: Golita Yue <gyue>
Component: qemu-kvmAssignee: Alex Williamson <alex.williamson>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: high    
Version: 6.0CC: akong, ddumas, ehabkost, fyang, jasowang, llim, michen, mkenneth, mst, syeghiay, tburke, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-0.12.1.2-2.110.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-10 21:27:05 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Golita Yue 2010-08-09 04:05:56 UTC 
Description of problem:
Start a winXP-32 bit guest with -"spice",
Live migration failed when migration during reboot

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.108.el6.x86_64
2.6.32-59.el6.x86_64

How reproducible:
2/2

Steps to Reproduce:
1. Start a winXP-32 bit guest with "-spice
port=5930,disable-ticketing -vga qxl:"
/usr/libexec/qemu-kvm -usbdevice tablet -rtc base=localtime,clock=host,driftfix=slew -cpu qemu64,+x2apic -m 2G -smp 2 -drive file=/dev/vgtest/gyue_xp,if=virtio,boot=on,cache=none,format=qcow2,werror=stop,rerror=stop,id=drive-virtio0 -device virtio-blk-pci,drive=drive-virtio0,id=virtio-blk-pci0,addr=0x8 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,mac=00:10:23:23:03:1c,bus=pci.0,addr=0x7,id=hostnet0 -uuid `uuidgen` -boot c -qmp tcp:0:4442,server,nowait -spice port=5930,disable-ticketing -vga qxl

2.after VM start ,then reboot it.
3.during reboot,do live migration.
  
Actual results:
Live migration failed .
in the qemu monitor displays
"qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.12.1.2/hw/vhost.c:31: vhost_dev_sync_region: Assertion `end / (0x1000 * (8 * sizeof(vhost_log_chunk_t))) < dev->log_size' failed."

Expected results:
Live Migration can be finished successfuly.

Additional info:
gdb information:

qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.12.1.2/hw/vhost.c:31: vhost_dev_sync_region: Assertion `end / (0x1000 * (8 * sizeof(vhost_log_chunk_t))) < dev->log_size' failed.

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7f768422e710 (LWP 24399)]
0x0000003eb26329b5 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x0000003eb26329b5 in raise () from /lib64/libc.so.6
#1  0x0000003eb2634195 in abort () from /lib64/libc.so.6
#2  0x0000003eb262b945 in __assert_fail () from /lib64/libc.so.6
#3  0x00000000004230eb in ?? ()
#4  0x0000000000423171 in ?? ()
#5  0x0000000000424265 in ?? ()
#6  0x00000000004df8fe in ?? ()
#7  0x0000000000473fe5 in ?? ()
#8  0x000000000041896b in ?? ()
#9  0x000000000047296a in ?? ()
#10 0x000000000042aa49 in ?? ()
#11 0x000000000042aae9 in ?? ()
#12 0x000000000042b70f in ?? ()
#13 0x0000003eb2e077e1 in start_thread () from /lib64/libpthread.so.0
#14 0x0000003eb26e151d in clone () from /lib64/libc.so.6
Comment 4 Golita Yue 2010-08-09 05:38:15 UTC 
I tested again with nic=rtl8139, passed.
But bug happened when nic=virtio.
Comment 5 jason wang 2010-08-09 05:57:24 UTC 
Hello Golita:
   It does not look like a problem of spice, can you please try to reproduce it without "-spice" option? Thanks
Comment 6 Golita Yue 2010-08-09 09:53:51 UTC 
(In reply to comment #5)
> Hello Golita:
>    It does not look like a problem of spice, can you please try to reproduce it
> without "-spice" option? Thanks    

Tested again without '-spice', still failed.
Updated summary.
Comment 7 Alex Williamson 2010-08-10 20:38:56 UTC 
Please try this brew build to see if it fixes the problem:

https://brewweb.devel.redhat.com/taskinfo?taskID=2672629
Comment 8 Golita Yue 2010-08-11 03:17:34 UTC 
(In reply to comment #7)
> Please try this brew build to see if it fixes the problem:
> 
> https://brewweb.devel.redhat.com/taskinfo?taskID=2672629    

Tested 5 times with above build, PASSED.
Comment 10 Eduardo Habkost 2010-08-11 15:16:34 UTC 
Fixing fixed-in-version field. It was not fixed on the official qemu-kvm-0.12.1.2-2.108.el6 build, the URL above was a scratch build.
Comment 12 Alex Williamson 2010-08-11 16:19:28 UTC 
(In reply to comment #8)
> (In reply to comment #7)
> > Please try this brew build to see if it fixes the problem:
> > 
> > https://brewweb.devel.redhat.com/taskinfo?taskID=2672629    
> 
> Tested 5 times with above build, PASSED.    

Great, we have one more respin of the fix.  Please confirm that this scratch build also resolves the problem:

https://brewweb.devel.redhat.com/taskinfo?taskID=2676174

Thanks
Comment 24 releng-rhel@redhat.com 2010-11-10 21:27:05 UTC 
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.