[ci] debug script execution

.travis.script.bash

@@ -10,7 +10,7 @@
 #   Felix Schindler (2017)
 #   Rene Milk       (2016 - 2017)
 
-set -e
+set -ex
 
 WAIT="${SUPERDIR}/scripts/bash/travis_wait_new.bash 45"
 source ${SUPERDIR}/scripts/bash/retry_command.bash
@@ -22,6 +22,8 @@ ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} make
 # -> builder will timeout -> manually run refresh_test_timings -> push results
 ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v -j 1 refresh_test_timings
 
+free -h
+
 if [ x"${TESTS}" == x ] ; then
     ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ninja -v test_binaries
     ${WAIT} ${SRC_DCTRL} ${BLD} --only=${MY_MODULE} bexec ctest -V -j 2