Regression tests for MobilityDB: Continous shutdowns at a random step

While executing the regression tests for MobilityDB I load a predefined database on which I run the tests and then compare the results obtained with those expected. All the tests are driven by the following bash file

However, I continuously receive at a random step in the process the following error in the log file

2021-08-25 16:48:13.608 CEST [22375] LOG:  received fast shutdown request
2021-08-25 16:48:13.622 CEST [22375] LOG:  aborting any active transactions
2021-08-25 16:48:13.622 CEST [22375] LOG:  background worker "logical replication launcher" (PID 22382) exited with exit code 1
2021-08-25 16:48:13.623 CEST [22377] LOG:  shutting down
2021-08-25 16:48:13.971 CEST [22375] LOG:  database system is shut down

and sometimes I need to relaunch *numerous* times the whole build process in CMake

to finalize the tests

/* While on MobilityDB/build directory */

rm -rf * 

cmake ..

make

make test

Any idea where I can begin looking at the problem ?

Thanks for your help

Esteban