** Changed in: linux (Ubuntu)
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
Canonical Kernel Team (canonical-kernel-team)

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1818645

Title:
  Ubuntu18.04.01: [Power9] power8 Compat guest(RHEL7.6) crashes during
  guest boot with > 256G of memory (kernel/kvm)

Status in The Ubuntu-power-systems project:
  Triaged
Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Satheesh Rajendran <sathe...@in.ibm.com> - 2019-02-28 
04:38:22 ==
  ---Problem Description---
  Power8 Compat guest(RHEL 7.6) crashes during guest boot with > 256G of memory 
(kernel/kvm)
   
  Contact Information = sathe...@in.ibm.com 
   
  ---uname output---
  Host Kernel: 4.15.0-1016-ibm-gt

  ii  qemu-system-ppc                                1:2.11+dfsg-
  1ubuntu7.8-1ibm3                                   ppc64el      QEMU
  full system emulation binaries (ppc)

  ii  libvirt-bin                                    4.0.0-1ubuntu8.6
  ppc64el      programs for the libvirt library

  Guest kernel: 3.10.0-957.5.1.el7.ppc64le (rhel7.6 zstream)
   
  Machine Type = power9 ppc64le 

   
  ---Steps to Reproduce---
   1. Boot a power8 compat guest with memory >256G
  virsh define avocado-vt-vm1;virsh start --console avocado-vt-vm1 (guest xml 
sosreport attached)
  ----Guest crashes while booting

  
  2019-02-28 10:36:44.752+0000: starting up libvirt version: 4.0.0, package: 
1ubuntu8.6 (Christian Ehrhardt <christian.ehrha...@canonical.com> Fri, 09 Nov 
2018 07:42:01 +0100), qemu version: 2.11.1(Debian 
1:2.11+dfsg-1ubuntu7.8-1ibm3), hostname: cs-host-f37-ac922-3.pok.ibm.com
  LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 
QEMU_AUDIO_DRV=none /usr/bin/qemu-system-ppc64 -name 
guest=avocado-vt-vm1,debug-threads=on -S -object 
secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-15-avocado-vt-vm1/master-key.aes
 -machine pseries-2.11,accel=kvm,usb=off,dump-guest-core=off -m 264192 
-realtime mlock=off -smp 256,sockets=256,cores=1,threads=1 -uuid 
f4e14f88-bf1b-4cc3-b6d6-958d514d6c18 -display none -no-user-config -nodefaults 
-chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-15-avocado-vt-vm1/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 -device 
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4 -drive 
file=/home/sath/avocado-fvt-wrapper/data/avocado-vt/images/rhel76-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:fc:fd:fe,bus=pci.0,addr=0x1 
-chardev pty,id=charserial0 -device 
spapr-vty,chardev=charserial0,id=serial0,reg=0x30000000 -chardev 
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-15-avocado-vt-vm1/org.qemu.guest_agent.0,server,nowait
 -device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
  2019-02-28 10:36:44.759+0000: 19598: info : libvirt version: 4.0.0, package: 
1ubuntu8.6 (Christian Ehrhardt <christian.ehrha...@canonical.com> Fri, 09 Nov 
2018 07:42:01 +0100)
  2019-02-28 10:36:44.759+0000: 19598: info : hostname: cs-host-f37-ac922-3
  2019-02-28 10:36:44.759+0000: 19598: info : virObjectUnref:350 : 
OBJECT_UNREF: obj=0x76d594111710
  2019-02-28T10:36:44.781703Z qemu-system-ppc64: -chardev pty,id=charserial0: 
char device redirected to /dev/pts/3 (label charserial0)
  2019-02-28T10:36:44.781945Z qemu-system-ppc64: warning: Number of SMP cpus 
requested (256) exceeds the recommended cpus supported by KVM (128)
  2019-02-28T10:36:44.781953Z qemu-system-ppc64: warning: Number of 
hotpluggable cpus requested (256) exceeds the recommended cpus supported by KVM 
(128)
  2019-02-28 10:37:18.060+0000: shutting down, reason=crashed
  2019-02-28T10:37:18.071969Z qemu-system-ppc64: terminating on signal 15 from 
pid 14056 (/usr/sbin/libvirtd)

   
  *Additional Instructions for sathe...@in.ibm.com: 
  -Post a private note with access information to the machine that the bug is 
occuring on.

  
  == Comment: #3 - Satheesh Rajendran <sathe...@in.ibm.com> - 2019-02-28 
04:51:45 ==
  Possible Upstream fix: 
https://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc.git/commit/?h=kvm-ppc-next&id=46dec40fb741f00f1864580130779aeeaf24fb3d

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