I believe there is test regression introduced by JDK-8245129. That change added two test lines, but it never checks the exit code for the first test line.

If we add the explicit exit code checks, like:

${JSTAT} ${COMMON_JSTAT_FLAGS} -gcutil 0 250 5 2>&1 | awk -f ${TESTSRC}/lineCounts1.awk
RC=$?
if [ $RC -ne 0 ]; then
  exit $RC
fi

${JSTAT} ${COMMON_JSTAT_FLAGS} -J-XX:+UseParallelGC -gcutil 0 250 5 2>&1 | awk -f ${TESTSRC}/lineCounts1.awk
RC=$?
if [ $RC -ne 0 ]; then
  exit $RC
fi

...then the test fails on current VMs:

$ CONF=linux-x86_64-server-fastdebug make run-test TEST=sun/tools/jstat/jstatLineCounts1.sh

STDOUT:
  S0 S1 E O M CCS YGC YGCT FGC FGCT CGC CGCT GCT
  0.00 0.00 0.00 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
  0.00 0.00 0.00 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
  0.00 0.00 0.00 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
  0.00 0.00 0.00 0.00 - - 0 0.000 0 0.000 0 0.000 0.000
  0.00 0.00 0.00 0.00 - - 0 0.000 0 0.000 0 0.000 0.000

The first case produces "M" and "CCS" columns as "-", which is not accepted by the current regexp.