qemu crashes when hotplug/unplug done continuosly with error spapr_drc_detach: assertion failed: (drc->dev) #9
Description
Qemu crashes with error "hw/ppc/spapr_drc.c:417:spapr_drc_detach: assertion failed: (drc->dev)" when memory hotplug and hotunplug was done continuously.
Steps to re-produce:
-
Bring up ppc64le guest with memory hotplug capabilities ( I used libvirt xml to do this).
-
And do continuous memory hotplug and unplug using the following memory xml (mem_hp_8g.xml)
<memory model='dimm'>
<target>
<size unit='KiB'>8388608</size>
<node>1</node>
</target>
</memory>
-
Run the following
for i inseq 1 100; do virsh attach-device mem_hp_8g.xml --live; virsh detach-device mem_hp_8g.xml --live; done -
Guest will crash
-
Following is from qemu log
2017-10-09 06:10:38.514+0000: starting up libvirt version: 3.6.0, package: 3.rel.gitdd9401b.el7.centos (Unknown, 2017-09-22-23:37:19, host-os-jenkins-slave02.aus.stglabs.ibm.com), qemu version: 2.10.0, hostname: zzfp365-lp1.aus.stglabs.ibm.com
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/bin/qemu-kvm -name guest=virt-tests-vm1-nrs,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-2-virt-tests-vm1-nrs/master-key.aes -machine pseries-2.10,accel=kvm,usb=off,dump-guest-core=off -m size=8388608k,slots=32,maxmem=138412032k -realtime mlock=off -smp 8,sockets=8,cores=1,threads=1 -numa node,nodeid=0,cpus=0-3,mem=4096 -numa node,nodeid=1,cpus=4-7,mem=4096 -object memory-backend-ram,id=memdimm0,size=4294967296 -device pc-dimm,node=0,memdev=memdimm0,id=dimm0,slot=0,addr=8589934592 -uuid 7c37594a-8052-4499-912a-7555033435cf -display none -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-2-virt-tests-vm1-nrs/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device pci-ohci,id=usb,bus=pci.0,addr=0x2 -device spapr-vscsi,id=scsi0,reg=0x2000 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive file=/home/nasastry/hostos-3.0-ppc64le.qcow2,format=qcow2,if=none,id=drive-scsi0-0-0-0 -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0,vhost=on,vhostfd=28 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:4a:4b:4c,bus=pci.0,addr=0x1 -chardev pty,id=charserial0 -device spapr-vty,chardev=charserial0,reg=0x30000000 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-2-virt-tests-vm1-nrs/vioser-00-00-01.sock,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0 -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu/channel/target/domain-2-virt-tests-vm1-nrs/vioser-00-00-02.sock,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 -msg timestamp=on
2017-10-09T06:10:38.617661Z qemu-system-ppc64: -chardev pty,id=charserial0: char device redirected to /dev/pts/4 (label charserial0)
**
ERROR:/builddir/build/BUILD/qemu/hw/ppc/spapr_drc.c:417:spapr_drc_detach: assertion failed: (drc->dev)
2017-10-09 06:16:39.979+0000: shutting down, reason=crashed
cde:info Mirrored with LTC bug #159863 </cde:info>