Regression tests for MobilityDB: Continous shutdowns at a random step

Hello

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
https://github.com/MobilityDB/MobilityDB/blob/develop/test/scripts/test.sh

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
https://github.com/MobilityDB/MobilityDB/blob/develop/CMakeLists.txt
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