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idmap fail with filesystem type='block'
# virsh dumpxml sew02
<domain type='lxc'>
<name>sew02</name>
<uuid>18f76f2f-0852-434c-8a3d-18a56ffdf33b</uuid>
<memory unit='KiB'>65536</memory>
<currentMemory unit='KiB'>65536</currentMemory>
<vcpu placement='static'>1</vcpu>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64'>exe</type>
<init>/sbin/init</init>
</os>
<idmap>
<uid start='0' target='10000' count='2000'/>
<gid start='0' target='10000' count='2000'/>
</idmap>
<features>
<privnet/>
</features>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/lib/libvirt_lxc</emulator>
<filesystem type='block' accessmode='passthrough'>
<source dev='/dev/instances/sew02'/>
<target dir='/'/>
</filesystem>
<filesystem type='mount' accessmode='passthrough'>
<source dir='/sys/fs/fuse/connections'/>
<target dir='/sys/fs/fuse/connections'/>
</filesystem>
<interface type='network'>
<mac address='52:54:00:64:1b:2a'/>
<source network='br1'/>
</interface>
<console type='pty'>
<target type='lxc' port='0'/>
</console>
</devices>
</domain>
# virsh start sew02
error: Failed to start domain sew02
error: internal error: guest failed to start: Failed to mount device /dev/dm-1 to /var/run/libvirt/lxc/sew02.root: Operation not permitted
0x7f085a52a160 0x7f085a529500
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