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Re: [Qemu-devel] [Bug 1842038] [NEW] qemu 4.0/4.1 segfault on live migra
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From: |
Stefan Hajnoczi |
|
Subject: |
Re: [Qemu-devel] [Bug 1842038] [NEW] qemu 4.0/4.1 segfault on live migrate with virtio-scsi iothread |
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Date: |
Mon, 2 Sep 2019 10:40:04 +0100 |
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User-agent: |
Mutt/1.12.1 (2019-06-15) |
On Fri, Aug 30, 2019 at 08:44:35AM -0000, Dmitriy wrote:
> Public bug reported:
Thanks for reporting this. There have been fixes for virtio-scsi with
iothreads lately, but QEMU 4.1.0 is fairly recent so it should have most
of them.
Can you try qemu.git/master?
>
> [root@kvm-nvme5 qemu]# uname -a
> Linux kvm-nvme5 4.14.35-1902.4.8.el7uek.x86_64 #2 SMP Sun Aug 4 22:25:18 GMT
> 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> [root@kvm-nvme5 qemu]# qemu-system-x86_64 --version
> QEMU emulator version 4.1.0 (qemu-4.1.0-1.el7)
> Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
>
> [root@kvm-nvme5 qemu]# libvirtd --version
> libvirtd (libvirt) 5.6.0
>
> when migrate
> MIGR_OPTS="--live --copy-storage-all --verbose --persistent --undefinesource"
> virsh migrate $MIGR_OPTS p12345 qemu+ssh://$SERV/system
>
> we got segfault if we have option <driver iothread='1'/> in config for
> virtio-scsi controller
>
> [1205674.818067] qemu-system-x86[39744]: segfault at 38 ip
> 00005575890ad411 sp 00007ffd3c10a0e0 error 6 in qemu-system-
> x86_64[5575889ad000+951000]
>
> On 4.0 we have error with this context(dont save all output)
> "qemu_coroutine_get_aio_context(co)' failed"
>
> If we remove option
> <driver iothread='1'/>
> migrate work fine without segfaults
>
> 2019-08-30 08:25:35.402+0000: starting up libvirt version: 5.6.0, package:
> 1.el7 (Unknown, 2019-08-06-09:57:56, mock), qemu version:
> 4.1.0qemu-4.1.0-1.el7, kernel: 4.14.35-1902.4.8.el7uek.x86_64, hostname:
> kvm-nvme5
> LC_ALL=C \
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin \
> HOME=/var/lib/libvirt/qemu/domain-75-p541999 \
> XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.local/share \
> XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.cache \
> XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.config \
> QEMU_AUDIO_DRV=none \
> /usr/bin/qemu-system-x86_64 \
> -name guest=p541999,debug-threads=on \
> -S \
> -object
> secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-75-p541999/master-key.aes
> \
> -machine pc-q35-4.0,accel=kvm,usb=off,dump-guest-core=off \
> -cpu
> Cascadelake-Server,ss=on,hypervisor=on,tsc-adjust=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,xsaves=on,rdctl-no=on,ibrs-all=on,skip-l1dfl-vmentry=on,mds-no=on,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1000,hv-vpindex,hv-runtime,hv-synic,hv-stimer,hv-fre
> quencies,hv-reenlightenment,hv-tlbflush \
> -m 2148 \
> -overcommit mem-lock=off \
> -smp 1,sockets=1,cores=1,threads=1 \
> -object iothread,id=iothread1 \
> -uuid ff20ae7f-8cfe-4ec5-bd50-e78f8a167414 \
> -no-user-config \
> -nodefaults \
> -chardev socket,id=charmonitor,fd=44,server,nowait \
> -mon chardev=charmonitor,id=monitor,mode=control \
> -rtc base=utc,driftfix=slew \
> -global kvm-pit.lost_tick_policy=delay \
> -no-shutdown \
> -boot menu=on,strict=on \
> -device ich9-usb-ehci1,id=usb,bus=pcie.0,addr=0x5.0x7 \
> -device
> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pcie.0,multifunction=on,addr=0x5
> \
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pcie.0,addr=0x5.0x1 \
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pcie.0,addr=0x5.0x2 \
> -device virtio-scsi-pci,iothread=iothread1,id=scsi0,bus=pcie.0,addr=0x9 \
> -device virtio-serial-pci,id=virtio-serial0,bus=pcie.0,addr=0x6 \
> -drive
> file=/dev/vm/p541999,format=raw,if=none,id=drive-scsi0-0-0-0,cache=none,discard=unmap,aio=threads,throttling.bps-write=52428800,throttling.bps-write-max=314572800,throttling.bps-write-max-length=120
> \
> -device
> scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,device_id=drive-scsi0-0-0-0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2,write-cache=on
> \
> -drive if=none,id=drive-sata0-0-0,readonly=on \
> -device ide-cd,bus=ide.0,drive=drive-sata0-0-0,id=sata0-0-0,bootindex=1 \
> -netdev tap,fd=47,id=hostnet0,vhost=on,vhostfd=48 \
> -device
> virtio-net-pci,netdev=hostnet0,id=net0,mac=00:00:00:54:19:99,bus=pcie.0,addr=0x3
> \
> -chardev pty,id=charserial0 \
> -device isa-serial,chardev=charserial0,id=serial0 \
> -chardev socket,id=charchannel0,fd=49,server,nowait \
> -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
> \
> -vnc 0.0.0.0:6128,password \
> -device cirrus-vga,id=video0,bus=pcie.0,addr=0x1 \
> -device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x8 \
> -sandbox
> on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
> -msg timestamp=on
> char device redirected to /dev/pts/5 (label charserial0)
> 2019-08-30 08:27:00.539+0000: shutting down, reason=crashed
>
>
> config:
> <domain type='kvm'>
> <name>p541999</name>
> <uuid>ff20ae7f-8cfe-4ec5-bd50-e78f8a167414</uuid>
> <memory unit='KiB'>2199552</memory>
> <currentMemory unit='KiB'>2199552</currentMemory>
> <vcpu placement='static'>1</vcpu>
> <iothreads>1</iothreads>
> <resource>
> <partition>/machine</partition>
> </resource>
> <os>
> <type arch='x86_64' machine='pc-q35-4.0'>hvm</type>
> <boot dev='cdrom'/>
> <boot dev='hd'/>
> <bootmenu enable='yes'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <pae/>
> <hyperv>
> <relaxed state='on'/>
> <vapic state='on'/>
> <spinlocks state='on' retries='4096'/>
> <vpindex state='on'/>
> <runtime state='on'/>
> <synic state='on'/>
> <stimer state='on'/>
> <frequencies state='on'/>
> <reenlightenment state='on'/>
> <tlbflush state='on'/>
> </hyperv>
> <msrs unknown='ignore'/>
> </features>
> <cpu mode='host-model' check='full'>
> <model fallback='forbid'/>
> </cpu>
> <clock offset='utc'>
> <timer name='rtc' tickpolicy='catchup'/>
> <timer name='pit' tickpolicy='delay'/>
> <timer name='hpet' present='yes'/>
> <timer name='hypervclock' present='yes'/>
> </clock>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
> <devices>
> <emulator>/usr/bin/qemu-system-x86_64</emulator>
> <disk type='block' device='disk'>
> <driver name='qemu' type='raw' cache='none' io='threads'
> discard='unmap'/>
> <source dev='/dev/vm/p541999'/>
> <backingStore/>
> <target dev='sda' bus='scsi'/>
> <iotune>
> <write_bytes_sec>52428800</write_bytes_sec>
> <write_bytes_sec_max>314572800</write_bytes_sec_max>
> <write_bytes_sec_max_length>120</write_bytes_sec_max_length>
> </iotune>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <disk type='file' device='cdrom'>
> <driver name='qemu' type='raw'/>
> <target dev='sdb' bus='sata'/>
> <readonly/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <controller type='usb' index='0' model='ich9-ehci1'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x7'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x0' multifunction='on'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x1'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x2'/>
> </controller>
> <controller type='virtio-serial' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> function='0x0'/>
> </controller>
> <controller type='scsi' index='0' model='virtio-scsi'>
> <driver iothread='1'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x09'
> function='0x0'/>
> </controller>
> <controller type='pci' index='0' model='pcie-root'/>
> <controller type='sata' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1f'
> function='0x2'/>
> </controller>
> <interface type='bridge'>
> <mac address='00:00:00:54:19:99'/>
> <source bridge='br0'/>
> <bandwidth>
> <inbound average='12500' peak='12500' burst='1024'/>
> <outbound average='12500' peak='12500' burst='1024'/>
> </bandwidth>
> <model type='virtio'/>
> <filterref filter='clean-traffic'>
> <parameter name='CTRL_IP_LEARNING' value='none'/>
> <parameter name='IP' value='1.2.3.4'/>
> </filterref>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> </interface>
> <serial type='pty'>
> <target type='isa-serial' port='0'>
> <model name='isa-serial'/>
> </target>
> </serial>
> <console type='pty'>
> <target type='serial' port='0'/>
> </console>
> <channel type='unix'>
> <source mode='bind' path='/var/lib/libvirt/qemu/p541999.agent'/>
> <target type='virtio' name='org.qemu.guest_agent.0'/>
> <address type='virtio-serial' controller='0' bus='0' port='1'/>
> </channel>
> <input type='mouse' bus='ps2'/>
> <input type='keyboard' bus='ps2'/>
> <graphics type='vnc' port='12028' autoport='no' listen='0.0.0.0'
> passwd='SUPERPASSWORD'>
> <listen type='address' address='0.0.0.0'/>
> </graphics>
> <video>
> <model type='cirrus' vram='16384' heads='1' primary='yes'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x0'/>
> </video>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
> function='0x0'/>
> </memballoon>
> </devices>
> <seclabel type='none' model='none'/>
> </domain>
>
> ** Affects: qemu
> Importance: Undecided
> Status: New
>
> --
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1842038
>
> Title:
> qemu 4.0/4.1 segfault on live migrate with virtio-scsi iothread
>
> Status in QEMU:
> New
>
> Bug description:
> [root@kvm-nvme5 qemu]# uname -a
> Linux kvm-nvme5 4.14.35-1902.4.8.el7uek.x86_64 #2 SMP Sun Aug 4 22:25:18
> GMT 2019 x86_64 x86_64 x86_64 GNU/Linux
>
> [root@kvm-nvme5 qemu]# qemu-system-x86_64 --version
> QEMU emulator version 4.1.0 (qemu-4.1.0-1.el7)
> Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
>
> [root@kvm-nvme5 qemu]# libvirtd --version
> libvirtd (libvirt) 5.6.0
>
> when migrate
> MIGR_OPTS="--live --copy-storage-all --verbose --persistent
> --undefinesource"
> virsh migrate $MIGR_OPTS p12345 qemu+ssh://$SERV/system
>
> we got segfault if we have option <driver iothread='1'/> in config for
> virtio-scsi controller
>
> [1205674.818067] qemu-system-x86[39744]: segfault at 38 ip
> 00005575890ad411 sp 00007ffd3c10a0e0 error 6 in qemu-system-
> x86_64[5575889ad000+951000]
>
> On 4.0 we have error with this context(dont save all output)
> "qemu_coroutine_get_aio_context(co)' failed"
>
> If we remove option
> <driver iothread='1'/>
> migrate work fine without segfaults
>
> 2019-08-30 08:25:35.402+0000: starting up libvirt version: 5.6.0, package:
> 1.el7 (Unknown, 2019-08-06-09:57:56, mock), qemu version:
> 4.1.0qemu-4.1.0-1.el7, kernel: 4.14.35-1902.4.8.el7uek.x86_64, hostname:
> kvm-nvme5
> LC_ALL=C \
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin \
> HOME=/var/lib/libvirt/qemu/domain-75-p541999 \
> XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.local/share \
> XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.cache \
> XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-75-p541999/.config \
> QEMU_AUDIO_DRV=none \
> /usr/bin/qemu-system-x86_64 \
> -name guest=p541999,debug-threads=on \
> -S \
> -object
> secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-75-p541999/master-key.aes
> \
> -machine pc-q35-4.0,accel=kvm,usb=off,dump-guest-core=off \
> -cpu
> Cascadelake-Server,ss=on,hypervisor=on,tsc-adjust=on,umip=on,pku=on,md-clear=on,stibp=on,arch-capabilities=on,xsaves=on,rdctl-no=on,ibrs-all=on,skip-l1dfl-vmentry=on,mds-no=on,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1000,hv-vpindex,hv-runtime,hv-synic,hv-stimer,hv-fre
> quencies,hv-reenlightenment,hv-tlbflush \
> -m 2148 \
> -overcommit mem-lock=off \
> -smp 1,sockets=1,cores=1,threads=1 \
> -object iothread,id=iothread1 \
> -uuid ff20ae7f-8cfe-4ec5-bd50-e78f8a167414 \
> -no-user-config \
> -nodefaults \
> -chardev socket,id=charmonitor,fd=44,server,nowait \
> -mon chardev=charmonitor,id=monitor,mode=control \
> -rtc base=utc,driftfix=slew \
> -global kvm-pit.lost_tick_policy=delay \
> -no-shutdown \
> -boot menu=on,strict=on \
> -device ich9-usb-ehci1,id=usb,bus=pcie.0,addr=0x5.0x7 \
> -device
> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pcie.0,multifunction=on,addr=0x5
> \
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pcie.0,addr=0x5.0x1 \
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pcie.0,addr=0x5.0x2 \
> -device virtio-scsi-pci,iothread=iothread1,id=scsi0,bus=pcie.0,addr=0x9 \
> -device virtio-serial-pci,id=virtio-serial0,bus=pcie.0,addr=0x6 \
> -drive
> file=/dev/vm/p541999,format=raw,if=none,id=drive-scsi0-0-0-0,cache=none,discard=unmap,aio=threads,throttling.bps-write=52428800,throttling.bps-write-max=314572800,throttling.bps-write-max-length=120
> \
> -device
> scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,device_id=drive-scsi0-0-0-0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2,write-cache=on
> \
> -drive if=none,id=drive-sata0-0-0,readonly=on \
> -device ide-cd,bus=ide.0,drive=drive-sata0-0-0,id=sata0-0-0,bootindex=1 \
> -netdev tap,fd=47,id=hostnet0,vhost=on,vhostfd=48 \
> -device
> virtio-net-pci,netdev=hostnet0,id=net0,mac=00:00:00:54:19:99,bus=pcie.0,addr=0x3
> \
> -chardev pty,id=charserial0 \
> -device isa-serial,chardev=charserial0,id=serial0 \
> -chardev socket,id=charchannel0,fd=49,server,nowait \
> -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
> \
> -vnc 0.0.0.0:6128,password \
> -device cirrus-vga,id=video0,bus=pcie.0,addr=0x1 \
> -device virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x8 \
> -sandbox
> on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
> -msg timestamp=on
> char device redirected to /dev/pts/5 (label charserial0)
> 2019-08-30 08:27:00.539+0000: shutting down, reason=crashed
>
>
> config:
> <domain type='kvm'>
> <name>p541999</name>
> <uuid>ff20ae7f-8cfe-4ec5-bd50-e78f8a167414</uuid>
> <memory unit='KiB'>2199552</memory>
> <currentMemory unit='KiB'>2199552</currentMemory>
> <vcpu placement='static'>1</vcpu>
> <iothreads>1</iothreads>
> <resource>
> <partition>/machine</partition>
> </resource>
> <os>
> <type arch='x86_64' machine='pc-q35-4.0'>hvm</type>
> <boot dev='cdrom'/>
> <boot dev='hd'/>
> <bootmenu enable='yes'/>
> </os>
> <features>
> <acpi/>
> <apic/>
> <pae/>
> <hyperv>
> <relaxed state='on'/>
> <vapic state='on'/>
> <spinlocks state='on' retries='4096'/>
> <vpindex state='on'/>
> <runtime state='on'/>
> <synic state='on'/>
> <stimer state='on'/>
> <frequencies state='on'/>
> <reenlightenment state='on'/>
> <tlbflush state='on'/>
> </hyperv>
> <msrs unknown='ignore'/>
> </features>
> <cpu mode='host-model' check='full'>
> <model fallback='forbid'/>
> </cpu>
> <clock offset='utc'>
> <timer name='rtc' tickpolicy='catchup'/>
> <timer name='pit' tickpolicy='delay'/>
> <timer name='hpet' present='yes'/>
> <timer name='hypervclock' present='yes'/>
> </clock>
> <on_poweroff>destroy</on_poweroff>
> <on_reboot>restart</on_reboot>
> <on_crash>restart</on_crash>
> <devices>
> <emulator>/usr/bin/qemu-system-x86_64</emulator>
> <disk type='block' device='disk'>
> <driver name='qemu' type='raw' cache='none' io='threads'
> discard='unmap'/>
> <source dev='/dev/vm/p541999'/>
> <backingStore/>
> <target dev='sda' bus='scsi'/>
> <iotune>
> <write_bytes_sec>52428800</write_bytes_sec>
> <write_bytes_sec_max>314572800</write_bytes_sec_max>
> <write_bytes_sec_max_length>120</write_bytes_sec_max_length>
> </iotune>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <disk type='file' device='cdrom'>
> <driver name='qemu' type='raw'/>
> <target dev='sdb' bus='sata'/>
> <readonly/>
> <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> </disk>
> <controller type='usb' index='0' model='ich9-ehci1'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x7'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x0' multifunction='on'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x1'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
> function='0x2'/>
> </controller>
> <controller type='virtio-serial' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
> function='0x0'/>
> </controller>
> <controller type='scsi' index='0' model='virtio-scsi'>
> <driver iothread='1'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x09'
> function='0x0'/>
> </controller>
> <controller type='pci' index='0' model='pcie-root'/>
> <controller type='sata' index='0'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x1f'
> function='0x2'/>
> </controller>
> <interface type='bridge'>
> <mac address='00:00:00:54:19:99'/>
> <source bridge='br0'/>
> <bandwidth>
> <inbound average='12500' peak='12500' burst='1024'/>
> <outbound average='12500' peak='12500' burst='1024'/>
> </bandwidth>
> <model type='virtio'/>
> <filterref filter='clean-traffic'>
> <parameter name='CTRL_IP_LEARNING' value='none'/>
> <parameter name='IP' value='1.2.3.4'/>
> </filterref>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> </interface>
> <serial type='pty'>
> <target type='isa-serial' port='0'>
> <model name='isa-serial'/>
> </target>
> </serial>
> <console type='pty'>
> <target type='serial' port='0'/>
> </console>
> <channel type='unix'>
> <source mode='bind' path='/var/lib/libvirt/qemu/p541999.agent'/>
> <target type='virtio' name='org.qemu.guest_agent.0'/>
> <address type='virtio-serial' controller='0' bus='0' port='1'/>
> </channel>
> <input type='mouse' bus='ps2'/>
> <input type='keyboard' bus='ps2'/>
> <graphics type='vnc' port='12028' autoport='no' listen='0.0.0.0'
> passwd='SUPERPASSWORD'>
> <listen type='address' address='0.0.0.0'/>
> </graphics>
> <video>
> <model type='cirrus' vram='16384' heads='1' primary='yes'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> function='0x0'/>
> </video>
> <memballoon model='virtio'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
> function='0x0'/>
> </memballoon>
> </devices>
> <seclabel type='none' model='none'/>
> </domain>
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1842038/+subscriptions
>
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- Re: [Qemu-devel] [Bug 1842038] [NEW] qemu 4.0/4.1 segfault on live migrate with virtio-scsi iothread,
Stefan Hajnoczi <=