Re: [Qemu-devel] E5-2620v2 - emulation stop error

Bandan Das
2015-03-26T02:47:40Z

Hi Andrey,

Andrey Korolyov <andrey@xdel.ru> writes:

> On Mon, Mar 16, 2015 at 10:17 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
>> For now, it looks like bug have a mixed Murphy-Heisenberg nature, as
>> it appearance is very rare (compared to the number of actual launches)
>> and most probably bounded to the physical characteristics of my
>> production nodes. As soon as I reach any reproducible path for a
>> regular workstation environment, I`ll let everyone know. Also I am
>> starting to think that issue can belong to the particular motherboard
>> firmware revision, despite fact that the CPU microcode is the same
>> everywhere.

I will take the risk and say this - "could it be a processor bug ?" :)

>
> Hello everyone, I`ve managed to reproduce this issue
> *deterministically* with latest seabios with smp fix and 3.18.3. The
> error occuring just *once* per vm until hypervisor reboots, at least
> in my setup, this is definitely crazy...
>
> - launch two VMs (Centos 7 in my case),
> - wait a little while they are booting,
> - attach serial console (I am using virsh list for this exact purpose),
> - issue acpi reboot or reset, does not matter,
> - VM always hangs at boot, most times with sgabios initialization
> string printed out [1], but sometimes it hangs a bit later [2],
> - no matter how many times I try to relaunch the QEMU afterwards, the
> issue does not appear on VM which experienced problem once;
> - trace and sample args can be seen in [3] and [4] respectively.

My system is a Dell R720 dual socket which has 2620v2s. I tried your
setup but couldn't reproduce (my qemu cmdline isn't exactly the same
as yours), although, if you could simplify your command line a bit,
I can try again.

Bandan

> 1)
> Google, Inc.
> Serial Graphics Adapter 06/11/14
> SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $
> (pbuilder@zorak) Wed Jun 11 05:57:34 UTC 2014
> Term: 211x62
> 4 0
>
> 2)
> Google, Inc.
> Serial Graphics Adapter 06/11/14
> SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $
> (pbuilder@zorak) Wed Jun 11 05:57:34 UTC 2014
> Term: 211x62
> 4 0
> [...empty screen...]
> SeaBIOS (version 1.8.1-20150325_230423-testnode)
> Machine UUID 3c78721f-7317-4f85-bcbe-f5ad46d293a1
>
>
> iPXE (http://ipxe.org) 00:02.0 C100 PCI2.10 PnP PMM+3FF95BA0+3FEF5BA0 C10
>
> 3)
>
> KVM internal error. Suberror: 2
> extra data[0]: 800000ef
> extra data[1]: 80000b0d
> EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000000
> ESI=00000000 EDI=00000000 EBP=00000000 ESP=00006d2c
> EIP=0000d331 EFL=00010202 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0000 00000000 0000ffff 00009300
> CS =f000 000f0000 0000ffff 00009b00
> SS =0000 00000000 0000ffff 00009300
> DS =0000 00000000 0000ffff 00009300
> FS =0000 00000000 0000ffff 00009300
> GS =0000 00000000 0000ffff 00009300
> LDT=0000 00000000 0000ffff 00008200
> TR =0000 00000000 0000ffff 00008b00
> GDT= 000f6cb0 00000037
> IDT= 00000000 000003ff
> CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
> DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=66 c3 cd 02 cb cd 10 cb cd 13 cb cd 15 cb cd 16 cb cd 18 cb <cd>
> 19 cb cd 1c cb cd 4a cb fa fc 66 ba 47 d3 0f 00 e9 ad fe f3 90 f0 0f
> ba 2d d4 fe fb 3f
>
> 4)
> /usr/bin/qemu-system-x86_64 -name centos71 -S -machine
> pc-i440fx-2.1,accel=kvm,usb=off -cpu SandyBridge,+kvm_pv_eoi -bios
> /usr/share/seabios/bios.bin -m 1024 -realtime mlock=off -smp
> 12,sockets=1,cores=12,threads=12 -uuid
> 3c78721f-7317-4f85-bcbe-f5ad46d293a1 -nographic -no-user-config
> -nodefaults -device sga -chardev
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/centos71.monitor,server,nowait
> -mon chardev=charmonitor,id=monitor,mode=control -rtc
> base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard
> -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global
> PIIX4_PM.disable_s4=1 -boot strict=on -device
> nec-usb-xhci,id=usb,bus=pci.0,addr=0x3 -device
> virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive
> file=rbd:dev-rack2/centos7-1.raw:id=qemukvm:key=XXXXXXXXXXXXXXXXXXXXXXXXXX:auth_supported=cephx\;none:mon_host=10.6.0.1\:6789\;10.6.0.3\:6789\;10.6.0.4\:6789,if=none,id=drive-virtio-disk0,format=raw,cache=writeback,aio=native
> -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
> -chardev pty,id=charserial0 -device
> isa-serial,chardev=charserial0,id=serial0 -chardev
> socket,id=charchannel0,path=/var/lib/libvirt/qemu/centos71.sock,server,nowait
> -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.1
> -msg timestamp=on