Bug 2004334

Passed on

Red Hat Enterprise Linux release 9.0 Beta (Plow)
5.14.0-2.el9.x86_64
qemu-kvm-6.0.0-13.el9_b.3.x86_64
seabios-bin-1.14.0-6.el9.noarch
edk2-ovmf-20210527gite1999b264f1f-6.el9.noarch
virtio-win-prewhql-0.1-207.iso


1.create scsi_debug disk 128 on iscsi server
modprobe scsi_debug  dev_size_mb=128

2.create mapper device with 10 minutes delay on the disk
dmsetup create test << EOF
0 160000 linear /dev/sdd 0
160000 5 delay /dev/sdd 0 0 /dev/sdd 0 600000
160005 80000 linear /dev/sdd 160005
EOF

3.expose mapper device with iscsi target
o- / ...................................................................................... [...]
  o- backstores ........................................................................... [...]
  | o- block ............................................................... [Storage Objects: 1]
  | | o- disk0 ............................... [/dev/mapper/test (117.2MiB) write-thru activated]
  | |   o- alua ................................................................ [ALUA Groups: 1]
  | |     o- default_tg_pt_gp .................................... [ALUA state: Active/optimized]
  | o- fileio .............................................................. [Storage Objects: 0]
  | o- pscsi ............................................................... [Storage Objects: 0]
  | o- ramdisk ............................................................. [Storage Objects: 0]
  o- iscsi ......................................................................... [Targets: 1]
  | o- iqn.2016-06.one.server:block ................................................... [TPGs: 1]
  |   o- tpg1 ............................................................ [no-gen-acls, no-auth]
  |     o- acls ....................................................................... [ACLs: 2]
  |     | o- iqn.1994-05.com.redhat:clienta .................................... [Mapped LUNs: 1]
  |     | | o- mapped_lun0 .............................................. [lun0 block/disk0 (rw)]
  |     | o- iqn.1994-05.com.redhat:clientb .................................... [Mapped LUNs: 1]
  |     |   o- mapped_lun0 .............................................. [lun0 block/disk0 (rw)]
  |     o- luns ....................................................................... [LUNs: 1]
  |     | o- lun0 ........................... [block/disk0 (/dev/mapper/test) (default_tg_pt_gp)]
  |     o- portals ................................................................. [Portals: 1]
  |       o- 0.0.0.0:3260 .................................................................. [OK]
  o- loopback ...................................................................... [Targets: 0]

4. attach disk on [other] host

iscsiadm -m discovery -t st -p dell7
iscsiadm -m node -T iqn.2016-06.one.server:block  -p dell7:3260 -l

root@dell-per6515-03 /home/vbugs/bug/1994041 $ lsblk 
NAME                            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
...
sdb                               8:16   0 117.2M  0 disk 


5.boot vm with passthrough disk

/usr/libexec/qemu-kvm \
  -name testvm \
  -machine pc \
  -m 8G \
  -smp 8 \
  -cpu host,+kvm_pv_unhalt \
  -device ich9-usb-ehci1,id=usb1 \
  -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
  -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0xa \
  -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x6 \
  -blockdev driver=qcow2,file.driver=file,file.filename=/home/kvm_autotest_root/images/rhel840-64-virtio-scsi.qcow2,node-name=os_image1   \
  -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=os_image1,id=virtio-disk0,bootindex=1 \
  \
  -blockdev driver=raw,file.driver=host_device,file.filename=/dev/sdb,node-name=data1   \
  -device scsi-block,bus=scsi0.0,drive=data1,id=disk1,bootindex=2 \
  \
  -vnc :5 \
  -qmp tcp:0:5955,server,nowait \
  -monitor stdio \
  -netdev \
  tap,id=hostnet0,vhost=on \
  -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:dd:0a:82,bus=pci.0


6. execute io on guest and step in low speed write status

dev=sda
if [ "x$1" != "x" ];then
dev=$1
fi
echo "$dev"
while true;do
sg_dd if=/dev/zero of=/dev/$dev bs=1M count=100 oflag=direct
echo "do dd"
done

7.find the qemu process and kill it
pid=`pgrep qemu-kvm`;echo $pid;  kill -9 $pid
time while true;do if ps $pid; then sleep 10;echo "active";else echo "exit";break;fi done


8.the real kill time is about 3 minutes

This bug was fixed in RHEL 9.0 GA in qemu-kvm-6.2.0-11.el9_0.2.x86_64.rpm