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+Ubuntu 15.10: QEMU VM hang if memory >= 1T
+
+1. Ubuntu 15.10 x86_64 installed on HP SuperDome X with 8CPUs and 4T memory.
+
+2. Create a VM, install Ubuntu 15.10, if memory >= 1T , VM hang when start. If memory < 1T, it is good.
+<domain type='kvm'>
+  <name>u1510-1</name>
+  <uuid>39eefe1e-4829-4843-b892-026d143f3ec7</uuid>
+  <memory unit='KiB'>1073741824</memory>
+  <currentMemory unit='KiB'>1073741824</currentMemory>
+  <vcpu placement='static'>16</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type>
+    <boot dev='hd'/>
+    <boot dev='cdrom'/>
+  </os>
+  <features>
+    <acpi/>
+    <apic/>
+    <pae/>
+  </features>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>restart</on_crash>
+  <devices>
+    <emulator>/usr/bin/kvm</emulator>
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2' cache='directsync'/>
+      <source file='/vms/images/u1510-1.img'/>
+      <target dev='vda' bus='virtio'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
+    </disk>
+    <disk type='file' device='cdrom'>
+      <driver name='qemu' type='raw'/>
+      <target dev='hdc' bus='ide'/>
+      <readonly/>
+      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
+    </disk>
+    <controller type='pci' index='0' model='pci-root'/>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <interface type='bridge'>
+      <mac address='0c:da:41:1d:ae:f1'/>
+      <source bridge='vswitch0'/>
+      <model type='virtio'/>
+      <driver name='vhost'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </interface>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
+      <listen type='address' address='0.0.0.0'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='16384' heads='1'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </video>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>
+
+3. The panic stack is
+  ... cannot show
+  async_page_fault+0x28
+  ioread32_rep+0x38
+  ata_sff_data_xfer32+0x8a
+  ata_pio_sector+0x93
+  ata_pio_sectors+0x34
+  ata_sff_hsm_move+0x226
+  RIP: kthread_data+0x10
+  CR2: FFFFFFFF_FFFFFFD8
+
+4. Change the host os to Redhat 7.2 , the vm is good even memory >=3.8T.
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