Hello, On Tue, 19 Jan 2016 23:18:59 +0100 Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > So this is kernel 4.4 on the host, and virtio-scsi in the guest. What > about virtio-blk in the guest? Tried with: -device virtio-blk-pci,drive=hd,scsi=off it locks up as well. In fact turns out it's not 100% lock-up, more like 50-80% chance. But it certainly happens if I trigger heavy disk activity in the guest: while true; do dd if=/dev/zero of=zerofile count=1024 bs=1M; sync; done ...at the same time repeatedly snapshotting the subvolume on the host. Could not trigger it even once with IDE so far. > > -drive > > if=none,id=hd,cache=writeback,aio=threads,format=raw,file=$NAME.img,discard=unmap,detect-zeroes=unmap > > \ > > So you're snapshotting the subvolume that includes $NAME.img? Yes -- With respect, Roman
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