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Created attachment 1154128 [details] debug log for this bug Description of problem: Hit this bug when run virtual_block test with autotest. python ConfigTest.py --category=virtual_block_device --guestname=RHEL.6.4 --platform=x86_64 --nicmodel=virtio_net --driveformat=virtio_blk,virtio_scsi --imageformat=qcow2 --display=spice --vcpu=8 --mem=8192 case: multi_disk_random_hotplug.parallel.single_type Version: Host kernel: 2.6.32-358.71.1.el6.x86_64 Guest kernel: 2.6.32-358.71.1.el6.x86_64 Qemu-kvm: qemu-kvm-0.12.1.2-2.355.el6_4.9.1.x86_64 How reproducible: Steps to Reproduce: 1.boot guest with 4 qmp and 2 hmp monitor. 2.create 20 image in host, sg0,sg1,...sg19 3.6 thread to do device add/del Th0: works with ['drive_stg0', 'stg0', 'drive_stg6', 'stg6', 'drive_stg12', 'stg12', 'drive_stg18', 'stg18'] devices Th1: works with ['drive_stg1', 'stg1', 'drive_stg7', 'stg7', 'drive_stg13', 'stg13', 'drive_stg19', 'stg19'] devices Th2: works with ['drive_stg2', 'stg2', 'drive_stg8', 'stg8', 'drive_stg14', 'stg14'] devices Th3: works with ['drive_stg3', 'stg3', 'drive_stg9', 'stg9', 'drive_stg15', 'stg15'] devices Th4: works with ['drive_stg4', 'stg4', 'drive_stg10', 'stg10', 'drive_stg16', 'stg16'] devices Th5: works with ['drive_stg5', 'stg5', 'drive_stg11', 'stg11', 'drive_stg17', 'stg17'] devices during device_add: [qemu output] qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.12.1.2/hw/virtio-scsi.c:623: virtio_scsi_push_event: Assertion `event == 0' failed. qemu crash, got core file. Actual results: Expected results: Additional info: CLI: /usr/libexec/qemu-kvm \ -S \ -name 'virt-tests-vm1' \ -machine pc \ -nodefaults \ -vga qxl \ -device AC97,bus=pci.0,addr=03 \ -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=qmp_id_qmpmonitor1,mode=control \ -chardev socket,id=hmp_id_TestHMP1,path=/tmp/monitor-TestHMP1-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=hmp_id_TestHMP1,mode=readline \ -chardev socket,id=hmp_id_TestHMP2,path=/tmp/monitor-TestHMP2-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=hmp_id_TestHMP2,mode=readline \ -chardev socket,id=qmp_id_TestQMP1,path=/tmp/monitor-TestQMP1-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=qmp_id_TestQMP1,mode=control \ -chardev socket,id=qmp_id_TestQMP2,path=/tmp/monitor-TestQMP2-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=qmp_id_TestQMP2,mode=control \ -chardev socket,id=qmp_id_catch_monitor,path=/tmp/monitor-catch_monitor-20160428-171524-zTDJm6B8,server,nowait \ -mon chardev=qmp_id_catch_monitor,mode=control \ -chardev socket,id=serial_id_serial0,path=/tmp/serial-serial0-20160428-171524-zTDJm6B8,server,nowait \ -device isa-serial,chardev=serial_id_serial0 \ -chardev socket,id=seabioslog_id_20160428-171524-zTDJm6B8,path=/tmp/seabios-20160428-171524-zTDJm6B8,server,nowait \ -device isa-debugcon,chardev=seabioslog_id_20160428-171524-zTDJm6B8,iobase=0x402 \ -device ich9-usb-ehci1,id=usb1,addr=1d.7,multifunction=on,bus=pci.0 \ -device ich9-usb-uhci1,id=usb1.0,multifunction=on,masterbus=usb1.0,addr=1d.0,firstport=0,bus=pci.0 \ -device ich9-usb-uhci2,id=usb1.1,multifunction=on,masterbus=usb1.0,addr=1d.2,firstport=2,bus=pci.0 \ -device ich9-usb-uhci3,id=usb1.2,multifunction=on,masterbus=usb1.0,addr=1d.4,firstport=4,bus=pci.0 \ -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pci.0,addr=04 \ -drive id=drive_image1,if=none,cache=none,snapshot=off,aio=native,format=qcow2,file=/home/autotest/client/tests/virt/shared/data/images/rhel64-64-virtio-scsi.qcow2 \ -device scsi-hd,id=image1,drive=drive_image1,bootindex=0 \ -device virtio-net-pci,mac=9a:d5:d6:d7:d8:d9,id=idZhcTDo,vectors=4,netdev=idb7ZYbY,bus=pci.0,addr=05 \ -netdev tap,id=idb7ZYbY,vhost=on,vhostfd=23,fd=22 \ -m 8192 \ -smp 8,maxcpus=8,cores=4,threads=1,sockets=2 \ -cpu 'SandyBridge' \ -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \ -spice port=3000,password=123456,addr=0,image-compression=auto_glz,zlib-glz-wan-compression=auto,streaming-video=all,agent-mouse=on,playback-compression=on,ipv4 \ -rtc base=utc,clock=host,driftfix=slew \ -boot order=cdn,once=c,menu=off \ -enable-kvm