[Qemu-devel] [Bug 1718118] Re: qemu crashes with hw/ppc/spapr_drc.c:417:spapr_drc_detach: assertion failed: (drc->dev)

[Thomas Huth]

Fix has been released with QEMU 2.11:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=2a129767ebb13ffc29dad

** Changed in: qemu
       Status: New => Fix Released

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Title:
  qemu crashes with hw/ppc/spapr_drc.c:417:spapr_drc_detach: assertion
  failed: (drc->dev)

Status in QEMU:
  Fix Released

Bug 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:
  1. git clone (today's i.e 19th Sept)
  2. Bring up ppc64le guest with memory hotplug capabilities ( I used libvirt 
xml to do this).
  3. 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>
  4. Run the following 
  for i in `seq 1 100`; do virsh attach-device nrs mem_hp_8g.xml --live; virsh 
detach-device nrs mem_hp_8g.xml --live; done
  5. Guest will crash
  6. Following is from qemu log

  LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin 
QEMU_AUDIO_DRV=none /usr/local/bin/qemu-system-ppc64 -name 
guest=nrs,debug-threads=on -S -object 
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-19-nrs/master-key.aes
 -machine pseries-2.10,accel=kvm,usb=off,dump-guest-core=off -m 
size=8388608k,slots=256,maxmem=419430400k -realtime mlock=off -smp 
4,sockets=4,cores=1,threads=1 -numa node,nodeid=0,cpus=0-1,mem=4096 -numa 
node,nodeid=1,cpus=2-3,mem=4096 -uuid d7987973-2467-43ff-b8d2-acefc6ac59e5 
-display none -no-user-config -nodefaults -chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-19-nrs/monitor.sock,server,nowait
 -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown 
-boot strict=on -device qemu-xhci,id=usb,bus=pci.0,addr=0x3 -device 
virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x2 -drive 
file=/home/nasastry/pegas-1.0-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=28,id=hostnet0,vhost=on,vhostfd=30 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:89:8a:8b,bus=pci.0,addr=0x1 
-chardev pty,id=charserial0 -device 
spapr-vty,chardev=charserial0,reg=0x30000000 -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -s -msg timestamp=on
  2017-09-19 06:59:07.878+0000: Domain id=19 is tainted: custom-argv
  2017-09-19T06:59:07.918273Z qemu-system-ppc64: -chardev pty,id=charserial0: 
char device redirected to /dev/pts/5 (label charserial0)
  **
  ERROR:/home/nasastry/qemu/hw/ppc/spapr_drc.c:417:spapr_drc_detach: assertion 
failed: (drc->dev)
  2017-09-19 06:59:51.428+0000: shutting down, reason=crashed

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