3 would have been in lieu of 2, which is in retrospect a better choice in this case, and will give you the opportunity to tighten liblttng-ctl0's own shlibs while you're at it. Please take care to have ltt-control build-depend on a version of liburcu-dev with this fix. (I presume liburcu-dev already Depends: liburcu1 (= ${binary:Version}.)
Thanks! -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.