add launchpad bug reports without comments

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+vmstate_load_state return error into virtio_load function
+
+Qemu version 4.2.1
+
+In the function of virtio_load, the vmstate_load_state will return error in the following case.
+
+The virtio is legacy mode(disable-modern=on,disable-legacy=off), virtio_device is in reset state. 
+
+In the the function of "vmstate_load_state", it will load all subsection. For the vmstate_virtio_extra_state subsection. 
+It will execute:
+vmstate_load_state   -->
+          ret = field->info->get(f, curr_elem, size, field);    line 143  vmstate.c.
+           -->virtio_pci_load_extra_state
+                        -->  vmstate_load_state
+                                 -->qemu_peek_byte
+But if the f->buf_index is same with buf_size, qemu_peek_byte function will set "-EIO" error. 
+the field->info->get will return 0, then it will get the error "ret = qemu_file_get_error(f);". then the vmstate_load_state will return error.
+
+It output is "Failed to load virtio/extra_state:extra_state"
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