Due to incorrect quoting in some awk statements in test.sh, socat FTBFS: https://launchpadlibrarian.net/624292174/buildlog_ubuntu-kinetic-amd64.socat_1.7.4.1-3ubuntu4_BUILDING.txt.gz. The relevant portion is this:
make[2]: Entering directory '/<<PKGBUILDDIR>>'
./test.sh
Using temp directory /tmp/buildd/7466
testing if address array is sorted... ok
testing if address options are sorted... ok
./test.sh: line 1924: syntax error near unexpected token `}'
./test.sh: line 1924: ` CYGWIN*) l="$(ps -pafe |grep "^[^ ]*[ ][ ]*[^ ][^ ]*[ ][ ]*$1[ ]" |awk '{print($2)';})" ;;'
make[2]: *** [Makefile:186: test] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_test: error: make -j4 test "TESTSUITEFLAGS=-j4 --verbose" VERBOSE=1 returned exit code 2
make[1]: *** [debian/rules:19: override_dh_auto_test] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:25: binary-arch] Error 2
dpkg-buildpackage: error: debian/rules binary-arch subprocess returned exit status 2
This is fixed upstream by a larger commit (https://repo.or.cz/socat.git/commit/ff51262e). It would probably be best at this stage in the Kinetic cycle to add a patch just the quoting fix.
Sponsored, thanks. Looks like bash changed behaviour and now fails at the time the function is defined, whereas previously that code path never ran so it never failed.