Submatrix ../t/op/threads.t

List of failing smokes by test.
Version Git-id Report OS
5.28.0 v5.28.0-RC1-16-gee50dc5205 66441 netbsd - 6.1.5
5.28.0 v5.27.11-24-g9fafc52ee1 65587 netbsd - 7.1.2
5.28.0 v5.27.11-15-ge7a4ac29db 65312 netbsd - 7.1.2