On Thu, Nov 08, 2018 at 07:10:58PM +0800, Ming Lei wrote:
I guess the issue may depend on specific QEMU version, just tried the test over
virtio-scsi/sata/usb-storage emulated via qemu-2.10.2-1.fc27, not observed
this problem.
I actually didn't use virtio-scsi, but it really doesn't matter.
FWIW, this is what I ran:
# qemu-system-x86_64 --version
QEMU emulator version 2.10.2(qemu-2.10.2-1.fc27)
# qemu-system-x86_64 -m 192 -smp 2 -enable-kvm -display none -snapshot \
-hda /mnt/images/fedora-27.img -nographic \
-append "console=tty0 console=ttyS0 root=/dav/sda rw" \
-kernel /boot/vmlinuz-4.18.10-100.fc27.x86_64 \
-initrd /boot/initramfs-4.18.10-100.fc27.x86_64.img
The file "fedora-27.img" is just a filesystem image of a minimal mock
setup from /var/lib/mock/fedora-27-x86_64/root/.
A small memory size makes it easier to observe, otherwise your probability
of allocating unclean pages lowers. That's really the only reason I used
qemu since all my real machines have too much memory that I never come
close to using, making observations more random.