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When xenstored crashes due to an unrecoverable condition it is calling either barf() or barf_perror() to issue a message and then exit(). Make sure the message is visible somewhere by using syslog() additionally to xprintf(), as the latter will be visible only with tracing active. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Paul Durrant <paul@xen.org> Reviewed-by: Julien Grall <jgrall@amazon.com>