[Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

[Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

[Alexandre DERUMIER]

Hi,

since qemu 2.4rc2, when I'm using iothreads, the vm is hanging, qmp queries are not working, vnc not working. (qemu process don't crash).

qemu 2.4 rc1 works fine. (don't have bisect it yet)


qemu command line:

qemu -chardev socket,id=qmp,path=/var/run/qemu-server/150.qmp,server,nowait -mon chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/150.vnc,x509,password -pidfile /var/run/qemu-server/150.pid -daemonize -smbios type=1,manufacturer=dell,version=1,product=3,uuid=f0686bfb-50b8-4d31-a4cb-b1cf60eeb648 -name debianok -smp 2,sockets=2,cores=1,maxcpus=2 -nodefaults -boot menu=on,strict=on,reboot-timeout=1000 -vga cirrus -cpu kvm64,+lahf_lm,+x2apic,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce -m 8192 -k fr -object iothread,id=iothread-virtio0 -device pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f -device pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e -device piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device usb-tablet,id=tablet,bus=uhci.0,port=1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi initiator-name=iqn.1993-08.org.debian.01.24b0d01a62a3 -drive file=/var/lib/vz/images/150/vm-150-disk-1.raw,if=none,id=drive-virtio0,cache=none,format=raw,aio=native,detect-zeroes=on -device virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,iothread=iothread-virtio0,bootindex=100

Regards,

Alexandre

Re: [Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

[Alexandre DERUMIER]

seem to come from this commit:

http://git.qemu.org/?p=qemu.git;a=commit;h=eabc977973103527bbb8fed69c91cfaa6691f8ab
"AioContext: fix broken ctx->dispatching optimization"


----- Mail original -----
De: "aderumier" <aderumier@odiso.com>
À: "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Mercredi 29 Juillet 2015 06:15:48
Objet: [Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

Hi, 

since qemu 2.4rc2, when I'm using iothreads, the vm is hanging, qmp queries are not working, vnc not working. (qemu process don't crash). 

qemu 2.4 rc1 works fine. (don't have bisect it yet) 


qemu command line: 

qemu -chardev socket,id=qmp,path=/var/run/qemu-server/150.qmp,server,nowait -mon chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/150.vnc,x509,password -pidfile /var/run/qemu-server/150.pid -daemonize -smbios type=1,manufacturer=dell,version=1,product=3,uuid=f0686bfb-50b8-4d31-a4cb-b1cf60eeb648 -name debianok -smp 2,sockets=2,cores=1,maxcpus=2 -nodefaults -boot menu=on,strict=on,reboot-timeout=1000 -vga cirrus -cpu kvm64,+lahf_lm,+x2apic,+sep,+kvm_pv_unhalt,+kvm_pv_eoi,enforce -m 8192 -k fr -object iothread,id=iothread-virtio0 -device pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f -device pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e -device piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2 -device usb-tablet,id=tablet,bus=uhci.0,port=1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -iscsi initiator-name=iqn.1993-08.org.debian.01.24b0d01a62a3 -drive file=/var/lib/vz/images/150/vm-150-disk-1.raw,if=none,id=drive-virtio0,cache=none,format=raw,aio=native,detect-zeroes=on -device virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,iothread=iothread-virtio0,bootindex=100 

Regards, 

Alexandre 

Re: [Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

[Paolo Bonzini]

On 29/07/2015 06:50, Alexandre DERUMIER wrote:
> seem to come from this commit:
> 
> http://git.qemu.org/?p=qemu.git;a=commit;h=eabc977973103527bbb8fed69c91cfaa6691f8ab
> "AioContext: fix broken ctx->dispatching optimization"

Stefan has a set of patches that fix it.

Paolo

Re: [Qemu-devel] qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

[Alexandre DERUMIER]

>>Stefan has a set of patches that fix it.
Yes, I just see it.

I'll them today.

Thanks !

----- Mail original -----
De: "pbonzini" <pbonzini@redhat.com>
À: "aderumier" <aderumier@odiso.com>, "qemu-devel" <qemu-devel@nongnu.org>
Envoyé: Mercredi 29 Juillet 2015 09:39:03
Objet: Re: qemu 2.4rc2 : iothread hanging vm (2.4rc1 works fine)

On 29/07/2015 06:50, Alexandre DERUMIER wrote: 
> seem to come from this commit: 
> 
> http://git.qemu.org/?p=qemu.git;a=commit;h=eabc977973103527bbb8fed69c91cfaa6691f8ab 
> "AioContext: fix broken ctx->dispatching optimization" 

Stefan has a set of patches that fix it. 

Paolo