diff --git a/tests/sys/kern/Makefile b/tests/sys/kern/Makefile
--- a/tests/sys/kern/Makefile
+++ b/tests/sys/kern/Makefile
@@ -23,6 +23,7 @@
 ATF_TESTS_C+=	ktrace_test
 ATF_TESTS_C+=	listener_wakeup
 ATF_TESTS_C+=	module_test
+ATF_TESTS_C+=	prace
 ATF_TESTS_C+=	ptrace_test
 TEST_METADATA.ptrace_test+=		timeout="15"
 ATF_TESTS_C+=	reaper
diff --git a/tests/sys/kern/prace.c b/tests/sys/kern/prace.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/kern/prace.c
@@ -0,0 +1,108 @@
+/*-
+ * Copyright (c) 2024 Klara, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sys/select.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <atf-c.h>
+
+static volatile sig_atomic_t caught[NSIG];
+
+static void
+handler(int signo)
+{
+	caught[signo]++;
+}
+
+static void
+child(int rd, bool poll)
+{
+	struct timespec timeout = { .tv_nsec = 1000000 };
+	sigset_t set0, set1;
+	int ret;
+
+	sigemptyset(&set0);
+	sigemptyset(&set1);
+	sigaddset(&set1, SIGINT);
+	sigprocmask(SIG_BLOCK, &set1, NULL);
+	signal(SIGINT, handler);
+	close(rd);
+	for (;;) {
+		ret = poll ? ppoll(NULL, 0, &timeout, &set0) :
+		    pselect(0, NULL, NULL, NULL, &timeout, &set0);
+		if (ret != 0 && errno != EINTR)
+			err(1, "p%s()", poll ? "poll" : "select");
+		if (ret == 0 && caught[SIGINT]) {
+			signal(SIGINT, SIG_DFL);
+			raise(SIGINT);
+		}
+		caught[SIGINT] = 0;
+	}
+	/* Not reached */
+}
+
+static void
+prace(bool poll)
+{
+	useconds_t timeout = 1100;
+	int pd[2], status;
+	pid_t pid;
+
+	if (pipe(pd) != 0)
+		err(1, "pipe()");
+	if ((pid = fork()) < 0)
+		err(1, "fork()");
+	if (pid == 0) {
+		close(pd[0]);
+		child(pd[1], poll);
+		/* Not reached */
+	}
+	close(pd[1]);
+	(void)read(pd[0], &pd[0], sizeof(pd[0]));
+	close(pd[0]);
+	do {
+		usleep(timeout);
+		if (kill(pid, SIGINT) != 0) {
+			if (errno != ENOENT)
+				err(1, "kill()");
+			break;
+		}
+	} while (timeout-- > 900);
+	(void)kill(pid, SIGKILL);
+	if (waitpid(pid, &status, 0) < 0)
+		err(1, "waitpid()");
+	ATF_REQUIRE(WIFSIGNALED(status));
+	ATF_REQUIRE_MSG(WTERMSIG(status) == SIGKILL,
+	    "child caught SIG%s", sys_signame[WTERMSIG(status)]);
+}
+
+ATF_TC_WITHOUT_HEAD(ppoll_race);
+ATF_TC_BODY(ppoll_race, tc)
+{
+	prace(true);
+}
+
+
+ATF_TC_WITHOUT_HEAD(pselect_race);
+ATF_TC_BODY(pselect_race, tc)
+{
+	prace(false);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, ppoll_race);
+	ATF_TP_ADD_TC(tp, pselect_race);
+	return (atf_no_error());
+}