Support stem's backtrace signals in Travis
In #29437 (moved), we're trying to track down a stem hang in our CI. In #30012 (closed), I added backtrace support to stem.
But we need that backtrace support in our CI to see why stem is hanging.
In #29437 (moved), we're trying to track down a stem hang in our CI. In #30012 (closed), I added backtrace support to stem.
But we need that backtrace support in our CI to see why stem is hanging.