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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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