Hi
I am using

kvm --version
QEMU emulator version 2.3.92

I have noticed if you select the iothread option in the disk options of
your KVM,  KVM hangs in a very nasty way: the kvm processes starts, the
qm manager reports the machine as running but actually it is not: it is
not possible to attach a qm terminal or qm monitor, or vnc console, it
seems the processes ignores the messages being sent over the qmp socket:


qm config 100 | grep iothread

virtio0: big1:vm-100-disk-1,cache=unsafe,backup=no,iothread=on,size=16G

 qm monitor 100
Entering Qemu Monitor for VM 100 - type 'help' for help
qm> info blockdev
ERROR: VM 100 qmp command 'human-monitor-command' failed - unable to
connect to VM 100 qmp socket - timeout after 31 retries


Emmanuel

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