[PATCH 5/5] selftests/liveupdate: Add stress-files kexec test

Pasha Tatashin
2026-04-14T20:02:48Z

Add a new luo_stress_files kexec test that verifies preserving and
retrieving 500 files across a kexec reboot.

Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
---
tools/testing/selftests/liveupdate/Makefile | 1 +
.../selftests/liveupdate/luo_stress_files.c | 98 +++++++++++++++++++
2 files changed, 99 insertions(+)
create mode 100644 tools/testing/selftests/liveupdate/luo_stress_files.c

diff --git a/tools/testing/selftests/liveupdate/Makefile b/tools/testing/selftests/liveupdate/Makefile
index ed7534468386..30689d22cb02 100644
--- a/tools/testing/selftests/liveupdate/Makefile
+++ b/tools/testing/selftests/liveupdate/Makefile
@@ -7,6 +7,7 @@ TEST_GEN_PROGS += liveupdate
TEST_GEN_PROGS_EXTENDED += luo_kexec_simple
TEST_GEN_PROGS_EXTENDED += luo_multi_session
TEST_GEN_PROGS_EXTENDED += luo_stress_sessions
+TEST_GEN_PROGS_EXTENDED += luo_stress_files

TEST_FILES += do_kexec.sh

diff --git a/tools/testing/selftests/liveupdate/luo_stress_files.c b/tools/testing/selftests/liveupdate/luo_stress_files.c
new file mode 100644
index 000000000000..6217122b92f4
--- /dev/null
+++ b/tools/testing/selftests/liveupdate/luo_stress_files.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * Copyright (c) 2026, Google LLC.
+ * Pasha Tatashin <pasha.tatashin@soleen.com>
+ *
+ * Validate that LUO can handle a large number of files per session across
+ * a kexec reboot.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include "luo_test_utils.h"
+
+#define NUM_FILES 500
+#define STATE_SESSION_NAME "kexec_many_files_state"
+#define STATE_MEMFD_TOKEN 9999
+#define TEST_SESSION_NAME "many_files_session"
+
+/* Stage 1: Executed before the kexec reboot. */
+static void run_stage_1(int luo_fd)
+{
+ int session_fd;
+ int i;
+
+ ksft_print_msg("[STAGE 1] Increasing ulimit for open files...\n");
+ luo_ensure_nofile_limit(NUM_FILES + 10);
+
+ ksft_print_msg("[STAGE 1] Creating state file for next stage (2)...\n");
+ create_state_file(luo_fd, STATE_SESSION_NAME, STATE_MEMFD_TOKEN, 2);
+
+ ksft_print_msg("[STAGE 1] Creating test session '%s'...\n", TEST_SESSION_NAME);
+ session_fd = luo_create_session(luo_fd, TEST_SESSION_NAME);
+ if (session_fd < 0)
+ fail_exit("luo_create_session");
+
+ ksft_print_msg("[STAGE 1] Preserving %d files...\n", NUM_FILES);
+ for (i = 0; i < NUM_FILES; i++) {
+ char data[64];
+
+ snprintf(data, sizeof(data), "file-data-%d", i);
+ if (create_and_preserve_memfd(session_fd, i, data) < 0)
+ fail_exit("create_and_preserve_memfd for index %d", i);
+ }
+
+ ksft_print_msg("[STAGE 1] Successfully preserved %d files.\n", NUM_FILES);
+
+ close(luo_fd);
+ daemonize_and_wait();
+}
+
+/* Stage 2: Executed after the kexec reboot. */
+static void run_stage_2(int luo_fd, int state_session_fd)
+{
+ int session_fd;
+ int i, stage;
+
+ ksft_print_msg("[STAGE 2] Starting post-kexec verification...\n");
+
+ restore_and_read_stage(state_session_fd, STATE_MEMFD_TOKEN, &stage);
+ if (stage != 2) {
+ fail_exit("Expected stage 2, but state file contains %d",
+ stage);
+ }
+
+ ksft_print_msg("[STAGE 2] Retrieving test session '%s'...\n", TEST_SESSION_NAME);
+ session_fd = luo_retrieve_session(luo_fd, TEST_SESSION_NAME);
+ if (session_fd < 0)
+ fail_exit("luo_retrieve_session");
+
+ ksft_print_msg("[STAGE 2] Verifying %d files...\n", NUM_FILES);
+ for (i = 0; i < NUM_FILES; i++) {
+ char data[64];
+
+ snprintf(data, sizeof(data), "file-data-%d", i);
+ if (restore_and_verify_memfd(session_fd, i, data) < 0)
+ fail_exit("restore_and_verify_memfd for index %d", i);
+ }
+
+ ksft_print_msg("[STAGE 2] Finishing test session...\n");
+ if (luo_session_finish(session_fd) < 0)
+ fail_exit("luo_session_finish for test session");
+ close(session_fd);
+
+ ksft_print_msg("[STAGE 2] Finalizing state session...\n");
+ if (luo_session_finish(state_session_fd) < 0)
+ fail_exit("luo_session_finish for state session");
+ close(state_session_fd);
+
+ ksft_print_msg("\n--- MANY-FILES KEXEC TEST PASSED (%d files) ---\n",
+ NUM_FILES);
+}
+
+int main(int argc, char *argv[])
+{
+ return luo_test(argc, argv, STATE_SESSION_NAME,
+ run_stage_1, run_stage_2);
+}
--
2.43.0