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(In reply to Gerd Hoffmann from comment #3)
> Please retest with qemu 1.5 once rpms are available.
> Console subsystem rewrite might have fixed this.
Re-test 10 times with packages qemu-kvm-1.5.0-2.el7.x86_64 + kernel-3.9.0-0.55.el7.x86_64 on rhel7 host, not reproduced this defeat;
Thanks,
Xu
Created attachment 730123 [details] backtrace Description of problem: qemu crash when connect with vnc viewer, qemu out said qemu_mutex_lock: Invalid argument; vga is cirrus, crash info please check attachment; Version-Release number of selected component (if applicable): qemu-kvm-common-1.4.0-1.el7.x86_64 qemu-kvm-1.4.0-1.el7.x86_64 qemu-kvm-tools-1.4.0-1.el7.x86_64 ipxe-roms-qemu-20120328-2.gitaac9718.el7.noarch qemu-img-1.4.0-1.el7.x86_64 kernel-3.9.0-0.rc4.45.el7.x86_64 How reproducible: just once Steps to Reproduce: 1. boot up windows xp guest with command: /root/test/autotest-devel/client/tests/kvm/qemu -S -name 'vm1' -nodefaults -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20130401-094641-r4SLdp6t,server,nowait -mon chardev=qmp_id_qmpmonitor1,mode=control -chardev socket,id=serial_id_serial1,path=/tmp/serial-serial1-20130401-094641-r4SLdp6t,server,nowait -device isa-serial,chardev=serial_id_serial1 -chardev socket,id=seabioslog_id_20130401-094641-r4SLdp6t,path=/tmp/seabios-20130401-094641-r4SLdp6t,server,nowait -device isa-debugcon,chardev=seabioslog_id_20130401-094641-r4SLdp6t,iobase=0x402 -device ich9-usb-uhci1,id=usb1,bus=pci.0,addr=0x4 -drive file='/root/test/autotest-devel/client/tests/kvm/images/winXP-32-virtio.raw',if=none,id=drive-virtio-disk1,media=disk,cache=unsafe,boot=off,snapshot=off,format=raw,aio=threads -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1 -drive file='/root/test/autotest-devel/client/tests/kvm/storage.raw',if=none,id=drive-virtio-disk2,media=disk,cache=unsafe,boot=off,snapshot=off,format=raw,aio=threads -device virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk2,id=virtio-disk2 -device virtio-net-pci,netdev=idfCEewV,mac=9a:5f:60:61:62:63,bus=pci.0,addr=0x3,id='idEY38Pv' -netdev tap,id=idfCEewV,vhost=on,fd=22 -m 4096 -smp 4,maxcpus=4,cores=2,threads=1,sockets=2 -cpu 'SandyBridge' -M pc -drive file='/root/test/autotest-devel/client/tests/kvm/isos/windows/winutils.iso',if=none,id=drive-ide0-0-0,media=cdrom,snapshot=off,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 -vnc :0 -vga cirrus -rtc base=localtime,clock=host,driftfix=slew -boot order=cdn,once=c,menu=off -enable-kv 2. connect guest with vncview <host IP> Actual results: qemu crashed Expected results: guest works well, qemu not crash Additional info: