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D61475.1794628108.diff
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diff --git a/tests/sys/kern/Makefile b/tests/sys/kern/Makefile
--- a/tests/sys/kern/Makefile
+++ b/tests/sys/kern/Makefile
@@ -82,6 +82,9 @@
ATF_TESTS_C+= pdeathsig
ATF_TESTS_C+= sigsys
TEST_METADATA.sigsys+= is_exclusive="true"
+.if ${MACHINE_ARCH:M*64*}
+ATF_TESTS_C+= vn_io_fault1
+.endif
ATF_TESTS_SH+= coredump_phnum_test
ATF_TESTS_SH+= logsigexit_test
diff --git a/tests/sys/kern/vn_io_fault1.c b/tests/sys/kern/vn_io_fault1.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/kern/vn_io_fault1.c
@@ -0,0 +1,56 @@
+/*-
+ * Copyright (c) 2026 Dag-Erling Smørgrav
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <atf-c.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+ATF_TC(big_unmapped_read);
+ATF_TC_HEAD(big_unmapped_read, tc)
+{
+ atf_tc_set_md_var(tc, "descr", "Read a large amount of data "
+ "into a partially unmapped buffer");
+}
+ATF_TC_BODY(big_unmapped_read, tc)
+{
+ char *buf;
+ size_t len = 3LU << 30;
+ ssize_t ret;
+ int fd;
+
+ /* allocate a large buffer */
+ if ((buf = malloc(len)) == NULL)
+ atf_tc_skip("failed to allocate buffer");
+
+ /* fault in just a tad more than the first 2 GB */
+ for (size_t i = 0; i <= 2LU << 30; i += 4096)
+ buf[i] = 0;
+
+ /* create a large file */
+ fd = open("big", O_RDWR | O_CREAT | O_TRUNC, 0600);
+ ATF_REQUIRE(fd >= 0);
+ ATF_REQUIRE_EQ_MSG(0, ftruncate(fd, len),
+ "failed to extend file: %m");
+
+ /* read the file into the buffer */
+ ret = read(fd, buf, len);
+ ATF_REQUIRE_MSG(ret >= 0,
+ "failed to read from file: %m");
+ ATF_REQUIRE_EQ_MSG(len, (size_t)ret,
+ "requested %zu bytes, got %zd", len, ret);
+
+ /* done */
+ ATF_CHECK_EQ(0, close(fd));
+ free(buf);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, big_unmapped_read);
+ return (atf_no_error());
+}

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