Hi! I can confirm this bug and indeed it happens with "qemu-system-x86_64" on 1:2.8+dfsg-6+deb9u2, too.
However, it does *not* happen using 1:2.8+dfsg-6+deb9u1! I have not tried it for a longer time but the memory consumption is a lot better immediately if I go back to 1:2.8+dfsg-6+deb9u1. On 1:2.8+dfsg-6+deb9u2, my Windows 7 x64 VM used 4GiB of Dom0 during setup and at least 1GiB for "normal operation" (slowly growing). Now, using 1:2.8+dfsg-6+deb9u1, QEMU consumes about 40MiB of Dom0 which is a lot better. Hope this helps to narrow down the issue. -- Best regards Thomas Keppler
