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QEMU Crashes During Snapshot: bdrv_co_write_req_prepare Assertion child->perm & BLK_PERM_WRITE Failed
Description of problem:
After taking a external snapshot (w/ memory state) with libvirt, the QEMU process crashed with an assertion
```
qemu-system-x86_64: ../block/io.c:2052: bdrv_co_write_req_prepare: Assertion `child->perm & BLK_PERM_WRITE` failed.
```
Steps to reproduce:
1. Start the qemu process
2. Take an external (w/ memory) snapshot by libvirt Python API
```python
domain.snapshotCreateXML(<xml_string>,
libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_ATOMIC |
libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_REUSE_EXT |
libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_LIVE)
```
3. The qemu process crashed by hitting the assertion
Additional information:
Libvirt domain XML
```xml
<domain type='kvm'>
<name>1a3dabc5-c33b-4308-acc5-2245f3b64163</name>
<uuid>1a3dabc5-c33b-4308-acc5-2245f3b64163</uuid>
<metadata xmlns:qvs="http://www.qnap.com/schemas/qvs/1.0">
</metadata>
<memory unit='KiB'>16777216</memory>
<currentMemory unit='KiB'>16777216</currentMemory>
<memoryBacking>
<nosharepages/>
</memoryBacking>
<vcpu placement='static' cpuset='0-23'>5</vcpu>
<sysinfo type='smbios'>
<system>
<entry name='manufacturer'>qemu</entry>
<entry name='product'>qemu</entry>
</system>
</sysinfo>
<os>
<type arch='x86_64' machine='pc-i440fx-7.0'>hvm</type>
<boot dev='cdrom'/>
<boot dev='hd'/>
<bootmenu enable='no'/>
<smbios mode='sysinfo'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode='host-passthrough' check='none' migratable='on'>
<topology sockets='1' dies='1' cores='5' threads='1'/>
<numa>
<cell id='0' cpus='0-4' memory='16777216' unit='KiB' memAccess='private'/>
</numa>
</cpu>
<clock offset='localtime'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/QVS/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1747803601' startupPolicy='optional'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1747630800'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1747371601'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1747198801'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1747026001'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1746594001'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1746421201'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1745557200'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1745211600'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1744174801'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1743570001'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1743138001'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1742965201'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1742360400'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1742187600'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1741928400'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1741755601'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1741323600'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1740718800'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1740546000'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1740373200'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1740114000'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1739941201'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1739768400'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1739509200'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1739336400'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1739163600'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1738904400'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1738558801'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1724816945'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1724045214_1'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.1721622169'/>
<backingStore type='file'>
<format type='qcow2'/>
<source file='/share/Virtualization Main/Win 10 x64 - Home VM/Win 10 x64 - Home VM_00.img'/>
<backingStore/>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
</backingStore>
<target dev='vdb' bus='virtio'/>
<serial>1a3dabc5c33b4308ac01</serial>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source startupPolicy='optional'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='usb' index='0' model='nec-xhci' ports='6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:a2:a4:e3'/>
<source bridge='qvs0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<channel type='unix'>
<source mode='bind' path='/QVS/var/lib/libvirt/qemu/1a3dabc5-c33b-4308-acc5-2245f3b64163.agent'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<tpm model='tpm-tis'>
<backend type='emulator' version='2.0'/>
</tpm>
<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1' keymap='en-us'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<graphics type='spice' autoport='yes' listen='127.0.0.1' keymap='en-us'>
<listen type='address' address='127.0.0.1'/>
<image compression='off'/>
<jpeg compression='never'/>
<zlib compression='never'/>
<playback compression='off'/>
<streaming mode='all'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<audio id='1' type='spice'/>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</memballoon>
</devices>
</domain>
```
|