cet-is » messagefacility

While investigating issue #13453, I boiled the problem down to the initialisation of message facility.
This the earth of the problem seems to be a call to:

mf::StartMessageFacility(mf::MessageFacilityService::SingleThread, mf_pset);

which used to work with messagefacility v1_16_26.
Somehow revealing is that if I use mf::MessageFacilityService::MultiThread instead of mf::MessageFacilityService::SingleThread everything seems to work.

I attach an executable that shows the problem. I compiled it with cetbuildtools:

cet_test(testing_test
  SOURCES testing_test.cxx
  LIBRARIES ${MF_MESSAGELOGGER}
            ${MF_UTILITIES}
            ${FHICLCPP}
            ${CETLIB}
)

The error I see is a grim Segmentation fault. Backtrace seems to depend on whether I enable the standard output or the standard error, but this could be a red herring.