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[Qemu-devel] [Bug 1785972] Re: v3.0.0-rc4: VM fails to start after vcpuh

From: Satheesh Rajendran
Subject: [Qemu-devel] [Bug 1785972] Re: v3.0.0-rc4: VM fails to start after vcpuhotunplug, managedsave sequence
Date: Wed, 08 Aug 2018 13:14:26 -0000

Last good commit I could find, 2309832afdaf8d6451ebc2e81bace8eb8ea41293
where both vcpu hotplug and managed save sequence worked fine.

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  v3.0.0-rc4: VM fails to start after vcpuhotunplug, managedsave

Status in QEMU:

Bug description:
  VM fails to start after vcpu hot un-plug, managedsave sequence

  Host info:
  Kernel: 4.18.0-rc8-00002-g1236568ee3cb

  qemu: commit 6ad90805383e6d04b3ff49681b8519a48c9f4410 (HEAD -> master, tag: 
  QEMU emulator version 2.12.94 (v3.0.0-rc4-dirty)

  libvirt: commit 087de2f5a3dffb27d2eeb0c50a86d5d6984e5a5e (HEAD -> master)
  libvirtd (libvirt) 4.6.0

  Guest Kernel: 4.18.0-rc8-00002-g1236568ee3cb

  Steps to reproduce:
  1. Start a guest(VM) with 2 current , 4 max vcpus
  virsh start vm1
  Domain vm1 started

  2. Hotplug 2 vcpus
  virsh setvcpus vm1 4 --live

  3. Hot unplug 2 vcpus
  virsh setvcpus vm1 2 --live

  4. Managedsave the VM
  virsh managedsave vm1

  Domain vm1 state saved by libvirt

  5. Start the VM ---Fails to start
  virsh start vm1

  error: Failed to start domain avocado-vt-vm1
  error: internal error: qemu unexpectedly closed the monitor: 
2018-08-08T06:27:53.853818Z qemu: Unknown savevm section or instance 
'spapr_cpu' 2
  2018-08-08T06:27:53.854949Z qemu: load of migration failed: Invalid argument

  avocado run 
 --vt-type libvirt --vt-extra-params 
emulator_path=/usr/share/avocado-plugins-vt/bin/qemu create_vm_libvirt=yes 
kill_vm_libvirt=yes env_cleanup=yes smp=8 backup_image_before_testing=no 
libvirt_controller=virtio-scsi scsi_hba=virtio-scsi-pci drive_format=scsi-hd 
use_os_variant=no restore_image_after_testing=no vga=none display=nographic 
kernel=/home/kvmci/linux/vmlinux kernel_args='root=/dev/sda2 rw console=tty0 
console=ttyS0,115200 init=/sbin/init  initcall_debug' 
take_regular_screendumps=no --vt-guest-os JeOS.27.ppc64le
  JOB ID     : 1f869477ad87e7d7e7e7777f631ae08965f41a74
  JOB LOG    : /root/avocado/job-results/job-2018-08-08T02.42-1f86947/job.log
 ERROR (91.58 s)
  RESULTS    : PASS 0 | ERROR 1 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | 
  JOB TIME   : 95.89 s

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