Bug 1711155

wontfix in RHEL7 due to capacity. Moving to RHEL8-AV (where this seems to be fixed already, will update it later)

(In reply to Han Han from comment #0)
> BTW, all works well on 
> libvirt-5.3.0-1.module+el8.1.0+3164+94495c71.x86_64
> qemu-kvm-4.0.0-1.module+el8.1.0+3216+7947b8cc.x86_64
> libiscsi-1.18.0-6.module+el8+2603+0a5231c4.x86_64

Marking the BZ POST because the fixes are in QEMU-4.0.

We need QA_ACK+ for this.

Reproduced it on rhel7.7 with below steps:

Versions:
Host:
kernel-3.10.0-1053.el7.x86_64
qemu-kvm-rhev-2.12.0-32.el7
libiscsi-1.9.0-7.el7.x86_64


1. Prepare a iscsi server via targetcli
2. Start a vm with iscsi disk, set rw error policies to ignore
/usr/libexec/qemu-kvm \
    -S  \
    -name 'avocado-vt-vm1'  \
    -sandbox off  \
    -machine q35  \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x1 \
    -device pcie-root-port,id=pcie_root_port_0,slot=2,chassis=2,addr=0x2,bus=pcie.0 \
    -device pcie-root-port,id=pcie_root_port_1,slot=3,chassis=3,addr=0x3,bus=pcie.0 \
    -device pcie-root-port,id=pcie_root_port_2,slot=4,chassis=4,addr=0x4,bus=pcie.0  \
    -chardev socket,id=qmp_id_qmpmonitor1,path=/var/tmp/avocado_yvw268de/monitor-qmpmonitor1-20181017-004217-U4Tik3JV,server,nowait \
    -mon chardev=qmp_id_qmpmonitor1,mode=control  \
    -chardev socket,id=qmp_id_catch_monitor,path=/var/tmp/avocado_yvw268de/monitor-catch_monitor-20181017-004217-U4Tik3JV,server,nowait \
    -mon chardev=qmp_id_catch_monitor,mode=control \
    -device pvpanic,ioport=0x505,id=idaVJ26s  \
    -chardev socket,id=serial_id_serial0,path=/var/tmp/avocado_yvw268de/serial-serial0-20181017-004217-U4Tik3JV,server,nowait \
    -device isa-serial,chardev=serial_id_serial0  \
    -chardev socket,id=seabioslog_id_20181017-004217-U4Tik3JV,path=/var/tmp/avocado_yvw268de/seabios-20181017-004217-U4Tik3JV,server,nowait \
    -device isa-debugcon,chardev=seabioslog_id_20181017-004217-U4Tik3JV,iobase=0x402 \
    -device pcie-root-port,id=pcie.0-root-port-5,slot=5,chassis=5,addr=0x5,bus=pcie.0 \
    -device qemu-xhci,id=usb1,bus=pcie.0-root-port-5,addr=0x0 \
    -device pcie-root-port,id=pcie.0-root-port-6,slot=6,chassis=6,addr=0x6,bus=pcie.0 \
    -object iothread,id=iothread0 \
    -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pcie.0-root-port-6,addr=0x0,iothread=iothread0 \
    -blockdev driver=file,cache.direct=off,cache.no-flush=on,filename=/home/kvm_autotest_root/images/rhel810-64-virtio-scsi.qcow2,node-name=my_file \
    -blockdev driver=qcow2,node-name=my,file=my_file \
    -device scsi-hd,drive=my,id=image1,bootindex=0 \
     -device pcie-root-port,id=pcie.0-root-port-8,slot=8,chassis=8,addr=0x8,bus=pcie.0 \
    -device virtio-scsi-pci,id=scsi1,bus=pcie.0-root-port-8,addr=0x0 \
    -blockdev driver=qcow2,cache.direct=off,cache.no-flush=on,file.filename=/home/kvm_autotest_root/images/data.qcow2,node-name=drive2,file.driver=file \
    -device scsi-hd,drive=drive2,id=data-disk1,bus=scsi1.0 \
    -device pcie-root-port,id=pcie.0-root-port-7,slot=7,chassis=7,addr=0x7,bus=pcie.0 \
    -device virtio-net-pci,mac=9a:82:83:84:85:86,id=idWBc2X6,vectors=4,netdev=idX17Mug,bus=pcie.0-root-port-7,addr=0x0  \
    -netdev tap,id=idX17Mug,vhost=on \
    -m 8G  \
    -smp 12,maxcpus=12,cores=6,threads=1,sockets=2  \
    -cpu 'Opteron_G5',+kvm_pv_unhalt \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1  \
    -vnc :0  \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot order=cdn,once=d,menu=off,strict=off  \
    -enable-kvm \
    -monitor stdio \
    -qmp tcp:0:4444,server,nowait \
    -blockdev driver=raw,file.driver=iscsi,file.transport=tcp,file.portal=10.66.10.36,file.initiator-name=iqn.1994-05.com.redhat:d399855229c,file.target=iqn.2003-01.org.linux-iscsi.dhcp-10-36.x8664:sn.6131cd5db7bb-3,file.lun=0,cache.direct=off,cache.no-flush=on,node-name=drive3 \
    -device scsi-block,drive=drive3,id=data-disk2,bus=scsi1.0,werror=ignore,rerror=ignore \

3. disable access iscsi server

# iptables -A OUTPUT -s 10.73.196.59  -p tcp --dport 3260 -j REJECT


After step 3, the vm will hang. Moreover, no response from qmp.


(qemu) qemu-kvm: iSCSI: NOP timeout. Reconnecting...

# telnet localhost 4444
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

{"execute": "qmp_capabilities"}

no return.




Retested on rhel8.1.0, not hit this issue, So set status to VERIFIED.

Versions:
Host:
kernel-4.18.0-85.el8.x86_64
qemu-kvm-4.0.0-3.module+el8.1.0+3265+26c4ed71
libiscsi-1.18.0-6.module+el8.1.0+3258+4c45705b.x86_64

Guest:
kernel-4.18.0-85.el8.x86_64


After step 3, guest doesn't hang and it has response from qmp monitor.



(qemu) info block
my: /home/kvm_autotest_root/images/rhel810-64-virtio-scsi.qcow2 (qcow2)
    Attached to:      image1
    Cache mode:       writeback

drive2: /home/kvm_autotest_root/images/data.qcow2 (qcow2)
    Attached to:      data-disk1
    Cache mode:       writeback, ignore flushes

drive3: json:{"driver": "raw", "file": {"lun": 0, "portal": "10.66.10.36", "initiator-name": "iqn.1994-05.com.redhat:d399855229c", "driver": "iscsi", "transport": "tcp", "target": "iqn.2003-01.org.linux-iscsi.dhcp-10-36.x8664:sn.6131cd5db7bb-3"}} (raw)
    Attached to:      data-disk2
    Cache mode:       writeback, ignore flushes
(qemu) info status 
VM status: running

(qemu) qemu-kvm: iSCSI: NOP timeout. Reconnecting...
(qemu) info block
my: /home/kvm_autotest_root/images/rhel810-64-virtio-scsi.qcow2 (qcow2)
    Attached to:      image1
    Cache mode:       writeback

drive2: /home/kvm_autotest_root/images/data.qcow2 (qcow2)
    Attached to:      data-disk1
    Cache mode:       writeback, ignore flushes

drive3: json:{"driver": "raw", "file": {"lun": 0, "portal": "10.66.10.36", "initiator-name": "iqn.1994-05.com.redhat:d399855229c", "driver": "iscsi", "transport": "tcp", "target": "iqn.2003-01.org.linux-iscsi.dhcp-10-36.x8664:sn.6131cd5db7bb-3"}} (raw)
    Attached to:      data-disk2
    Cache mode:       writeback, ignore flushes
(qemu) info status 
VM status: running

# telnet localhost 4444
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
{"QMP": {"version": {"qemu": {"micro": 0, "minor": 0, "major": 4}, "package": "qemu-kvm-4.0.0-3.module+el8.1.0+3265+26c4ed71"}, "capabilities": ["oob"]}}

{"execute": "qmp_capabilities"}

{"return": {}}

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3723