/usr/sbin/xentrace_setmask is in xen-utils-common 4.6.0-1ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/sbin/../lib/xen-common/bin/xen-utils-wrapper
/usr/sbin/../lib/xen-common/bin/xen-utils-wrapper