Patch posted at http://permalink.gmane.org/gmane.comp.emulators.qemu/243754

*** Bug 1038875 has been marked as a duplicate of this bug. ***

Fix included in qemu-kvm-1.5.3-40.el7

Reproduce this bug with component:
qemu-kvm-1.5.3-38.el7.x86_64

Steps:
1. Start Win2k8 R2 guest (2 Virtio SCSI disks).
e.g:# /usr/libexec/qemu-kvm -M pc -S -cpu SandyBridge -enable-kvm -m 2048 -smp 2,sockets=2,cores=1,threads=1 -no-kvm-pit-reinjection -usb -device usb-tablet,id=input0 -name zxc -uuid 990ea161-6b67-47b2-b803-19fb01e30d30 -rtc base=localtime,clock=host,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,vectors=0,bus=pci.0,addr=0x3 -chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait -device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port1 -chardev socket,id=channel2,path=/tmp/helloworld2,server,nowait -device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm,bus=virtio-serial0.0,id=port2 -drive file=/home/win2008r2-64-virtio.qcow2,if=none,id=drive-system-disk,format=qcow2,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,bus=pci.0,addr=0x4,id=scsi0 -device scsi-hd,drive=drive-system-disk,bus=scsi0.0,channel=0,scsi-id=0,lun=0,id=system-disk,bootindex=1 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=virtio-net-pci0,mac=00:01:02:B6:40:11,bus=pci.0,addr=0x5 -device virtio-balloon-pci,id=ballooning,bus=pci.0,addr=0x6 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -drive file=/home/my-data-disk.qcow2,if=none,id=drive-data-disk,format=qcow2,aio=native,werror=stop,rerror=stop -device scsi-hd,drive=drive-data-disk,bus=scsi0.0,channel=0,scsi-id=0,lun=1,id=data-disk -k en-us -boot menu=on -qmp tcp:0:4444,server,nowait -serial unix:/tmp/ttyS0,server,nowait -vnc :2 -spice disable-ticketing,port=5932 -monitor stdio
2. Start check of guest system disk (chkdsk c: /x /f /v /r).
3. Reboot guest for start checking.

Results:
qemu-kvm: hw/scsi/scsi-disk.c:287: scsi_dma_complete: Assertion `r->req.aiocb != ((void *)0)' failed.
bz1035644-cli: line 1:  8414 Aborted                 (core dumped)
------
Verify this bug with component:
qemu-kvm-1.5.3-41.el7.x86_64

Same steps as above.

Results:
after step 3, guest reboot well after chkdsk checking and it work well.

Base on these test results above, this bug has been fixed.

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.