Index: cddl/usr.sbin/dtrace/tests/tools/exclude.sh
===================================================================
--- cddl/usr.sbin/dtrace/tests/tools/exclude.sh
+++ cddl/usr.sbin/dtrace/tests/tools/exclude.sh
@@ -17,9 +17,11 @@
 # 1) and 2).
 #
 # The SKIP variable contains tests that should not be executed at all. The
-# EXFAIL variable contains tests that are expected to fail when run. Please
-# avoid adding tests to SKIP unless it really is necessary; with EXFAIL, tests
-# that begin passing as the result of a change are visible in the test summary.
+# EXFAIL variable contains tests that are expected to fail when run. The
+# SKIPCI variable contains tests that are flakey and should not be executed in
+# the CI environment. Please avoid adding tests to SKIP unless it really is
+# necessary; with EXFAIL, tests that begin passing as the result of a change
+# are visible in the test summary.
 
 exclude()
 {
@@ -206,3 +208,6 @@
 
 # Triggers a lock assertion by using the raise() action from a profile probe.
 exclude SKIP common/ustack/tst.spin.ksh
+
+# https://bugs.freebsd.org/237641
+exclude SKIPCI common/misc/tst.dynopt.d
Index: cddl/usr.sbin/dtrace/tests/tools/gentest.sh
===================================================================
--- cddl/usr.sbin/dtrace/tests/tools/gentest.sh
+++ cddl/usr.sbin/dtrace/tests/tools/gentest.sh
@@ -83,18 +83,20 @@
 . $EXCLUDES
 EXFAILS=$(echo -e "$EXFAIL" | grep "^${CATEGORY}/" | xargs basename -a)
 SKIPS=$(echo -e "$SKIP" | grep "^${CATEGORY}/" | xargs basename -a)
+SKIPCIS=$(echo -e "$SKIPCI" | grep "^${CATEGORY}/" | xargs basename -a)
 
 FILELIST=$(mktemp)
 trap 'rm -f $FILELIST' EXIT
 
 echo "$@" | tr ' ' '\n' | xargs basename -a | sort > ${FILELIST}
-TFILES=$(printf '%s\n%s' "$EXFAILS" "$SKIPS" | sort | comm -13 /dev/stdin $FILELIST)
+TFILES=$(printf '%s\n%s' "$EXFAILS" "$SKIPS" "$SKIPCIS" | sort | comm -13 /dev/stdin $FILELIST)
 
 #
 # Generate test cases.
 #
 gentestcases SKIPS "atf_skip \"test may hang or cause system instability\""
 gentestcases EXFAILS "atf_expect_fail \"test is known to fail\""
+gentestcases SKIPCIS "if [ \"\$(atf_config_get ci false)\" = \"true\" ]; then atf_skip \"see cddl/usr.sbin/dtrace/tests/tools/exclude.sh\"; fi"
 gentestcases TFILES
 
 #