[PATCH i-g-t v2 1/2] lib/igt_kmemleak: library to interact with kmemleak

[Peter Senna Tschudin <peter.senna@linux.intel.com>]

Adds a simple library for interacting with kmemleak and add
unit testing for the library. There are two modes intended to
integrate with igt_runner:
- once: collect kmemleaks after all test completed
- each: collect kmemleaks after eachb test completes

To use the library include "igt_kmemleak.h", call
igt_kmemleak_init(NULL) to check if kmemleak is enabled and finally
call igt_kmemleak() to collect kmemleaks. igt_kmemleak() expect the
following arguments:
  - const char *last_test: Name of the last lest or NULL
  - int resdirfd: file descriptor of the results directory
  - bool kmemleak_each: Are we scanning once or scanning after
    each test?
  - bool sync: sync after each write?

CC: stylon.wang@amd.com
CC: Rodrigo.Siqueira@amd.com>
CC: ramadevi.gandi@intel.com
CC: ryszard.knop@intel.com
CC: sameer.lattannavar@intel.com
CC: lucas.demarchi@intel.com
CC: jani.saarinen@intel.com
CC: katarzyna.piecielska@intel.com
CC: matthew.d.roper@intel.com
CC: gregory.f.germano@intel.com
CC: clinton.a.taylor@intel.com
CC: jianshui.yu@intel.com
CC: balasubramani.vivekanandan@intel.com

Reviewed-by: jonathan.cavitt@intel.com
Signed-off-by: Peter Senna Tschudin <peter.senna@linux.intel.com>
---
 lib/igt_kmemleak.c       | 274 +++++++++++++++++++++++++++++++++++++++
 lib/igt_kmemleak.h       |  16 +++
 lib/meson.build          |   1 +
 lib/tests/igt_kmemleak.c | 267 ++++++++++++++++++++++++++++++++++++++
 lib/tests/meson.build    |   1 +
 5 files changed, 559 insertions(+)
 create mode 100644 lib/igt_kmemleak.c
 create mode 100644 lib/igt_kmemleak.h
 create mode 100644 lib/tests/igt_kmemleak.c

diff --git a/lib/igt_kmemleak.c b/lib/igt_kmemleak.c
new file mode 100644
index 000000000..b875d95a2
--- /dev/null
+++ b/lib/igt_kmemleak.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "igt_core.h"
+#include "igt_kmemleak.h"
+
+/* We can change the path for unit testing, see igt_kmemleak_init() */
+static char igt_kmemleak_file[256] = "/sys/kernel/debug/kmemleak";
+
+#define MAX_WRITE_RETRIES 5
+/**
+ * igt_kmemleak_write - Writes the buffer to the file descriptor retrying when
+ * possible.
+ * @fd: The file descriptor to write to.
+ * @buf: Pointer to the data to write.
+ * @count: Total number of bytes to write.
+ *
+ * Returns the total number of bytes written on success, or -1 on failure.
+ */
+static bool igt_kmemleak_write(int fd, const void *buf, size_t count)
+{
+	const char *ptr = buf;
+	size_t remaining = count;
+	ssize_t written;
+	int retries = 0;
+
+	while (remaining > 0) {
+		written = write(fd, ptr, remaining);
+		if (written > 0) {
+			ptr += written;
+			remaining -= written;
+		} else if (written == -1) {
+			if (errno == EINTR || errno == EAGAIN) {
+				/* Retry for recoverable errors */
+				if (++retries > MAX_WRITE_RETRIES) {
+					igt_warn("igt_write: Exceeded retry limit\n");
+					return false;
+				}
+				continue;
+			} else {
+				/* Log unrecoverable error */
+				igt_warn("igt_write: unrecoverable write error");
+				return false;
+			}
+		} else if (written == 0) {
+			if (++retries > MAX_WRITE_RETRIES) {
+				igt_warn("igt_write: Exceeded retry limit\n");
+				return false;
+			}
+		}
+	}
+	return true;
+}
+
+/**
+ * igt_kmemeak_cmd:
+ * @cmd: command to send to kmemleak
+ *
+ * Send a command to kmemleak.
+ *
+ * Returns: true if sending the command was successful, false otherwise.
+ */
+static bool igt_kmemleak_cmd(const char *cmd)
+{
+	int fp;
+	bool res;
+
+	fp = open(igt_kmemleak_file, O_RDWR);
+	if (!fp)
+		return false;
+
+	res = igt_kmemleak_write(fp, cmd, strlen(cmd));
+	close(fp);
+
+	return res;
+}
+
+/**
+ * igt_kmemeak_clear:
+ *
+ * Trigger an immediate clear on kmemleak.
+ *
+ * Returns: true if sending the command to clear was successful, false
+ * otherwise.
+ */
+static bool igt_kmemleak_clear(void)
+{
+	return igt_kmemleak_cmd("clear");
+}
+
+/**
+ * igt_kmemeak_found_leaks:
+ *
+ * Check if kmemleak found any leaks by trying to read one byte from the
+ * kmemleak file.
+ *
+ * Returns: true if kmemleak found any leaks, false otherwise.
+ */
+static bool igt_kmemleak_found_leaks(void)
+{
+	FILE *fp;
+	char buf[1];
+	size_t rlen;
+
+	fp = fopen(igt_kmemleak_file, "r");
+	if (!fp)
+		return false;
+
+	rlen = fread(buf, 1, 1, fp);
+
+	if (rlen == 1)
+		lseek(fileno(fp), 0, SEEK_SET);
+
+	fclose(fp);
+
+	return rlen == 1;
+}
+
+/**
+ * igt_kmemeak_scan:
+ *
+ * Trigger an immediate scan on kmemleak.
+ *
+ * Returns: true if leaks are found. False on failure and when no leaks are
+ * found.
+ */
+static bool igt_kmemleak_scan(void)
+{
+	if (!igt_kmemleak_cmd("scan"))
+		return false;
+
+	/* kmemleak documentation states that "the memory scanning is only
+	 * performed when the /sys/kernel/debug/kmemleak file is read." Read
+	 * a byte to trigger the scan now.
+	 */
+	return igt_kmemleak_found_leaks();
+}
+
+/**
+ * igt_kmemleak_append_to:
+ * @last_test: last test name to append to the file
+ * @resdirfd: file descriptor of the results directory
+ * @kmemleak_each: Are we scanning once or scanning after each test?
+ * @sync: sync the kmemleak file often
+ *
+ * Append the kmemleak file to the result file adding a header indicating if
+ * the leaks are for all tests or for a single one.
+ *
+ * Returns: true if appending to the file was successful, false otherwise.
+ */
+static bool igt_kmemleak_append_to(const char *last_test, int resdirfd,
+				   bool kmemleak_each, bool sync)
+{
+	const char *before = "kmemleaks found before running any test\n\n";
+	const char *once = "kmemleaks found after running all tests\n";
+	int kmemleakfd, resfilefd;
+	char buf[4096];
+	size_t rlen;
+
+	kmemleakfd = open(igt_kmemleak_file, O_RDONLY);
+	if (kmemleakfd < 0)
+		return false;
+
+	/* Seek back to first byte */
+	lseek(kmemleakfd, 0, SEEK_SET);
+
+	/* Open text file to append */
+	resfilefd = openat(resdirfd, KMEMLEAKRESFILENAME,
+			   O_RDWR | O_CREAT | O_APPEND, 0666);
+	if (!resfilefd) {
+		close(kmemleakfd);
+		return false;
+	}
+
+	/* This is the header added before the content of the kmemleak file */
+	if (kmemleak_each) {
+		if (!last_test) {
+			igt_kmemleak_write(resfilefd, before, strlen(before));
+		} else {
+			/* Write \n\n last_test \n to buf */
+			snprintf(buf, sizeof(buf),
+				 "\n\nkmemleaks found after running %s:\n",
+				 last_test);
+
+			igt_kmemleak_write(resfilefd, buf, strlen(buf));
+			memset(buf, 0, sizeof(buf));
+		}
+	} else {
+		igt_kmemleak_write(resfilefd, once, strlen(once));
+	}
+
+	if (sync)
+		fsync(resfilefd);
+
+	while ((rlen = read(kmemleakfd, buf, sizeof(buf))) > 0) {
+		if (!igt_kmemleak_write(resfilefd, buf, rlen)) {
+			close(resfilefd);
+			close(kmemleakfd);
+			return false;
+		}
+		if (sync)
+			fsync(resfilefd);
+	}
+
+	close(resfilefd);
+	close(kmemleakfd);
+
+	return true;
+}
+
+/**
+ * igt_kmemeak_init:
+ * @unit_test_kmemleak_file: path to kmemleak file for unit testing
+ *
+ * Check if kmemleak is enabled in the kernel, if debugfs is mounted and
+ * if kmemleak file is present and readable.
+ *
+ * Returns: true if kmemleak is enabled, false otherwise.
+ */
+bool igt_kmemleak_init(const char *unit_test_kmemleak_file)
+{
+	FILE *fp;
+
+	if (unit_test_kmemleak_file)
+		snprintf(igt_kmemleak_file,
+			 sizeof(igt_kmemleak_file),
+			 "%s",
+			 unit_test_kmemleak_file);
+
+	fp = fopen(igt_kmemleak_file, "r");
+	if (!fp)
+		return false;
+
+	fclose(fp);
+
+	return true;
+}
+
+/**
+ * igt_kmemleak:
+ * @last_test: last test name to append to the file
+ * @resdirfd: file descriptor of the results directory
+ * @kmemleak_each: Are we scanning once or scanning after each test?
+ * @sync: sync the kmemleak file often
+ *
+ * This is the main function that should be called when integrating igt_kmemleak
+ * into igt_runner or elsewhere. There are two flows:
+ *  - run once: runs only once after all tests are completed
+ *  - run for each test: runs after every test
+ *
+ * Returns: true on success, false otherwise.
+ */
+bool igt_kmemleak(const char *last_test, int resdirfd, bool kmemleak_each,
+		  bool sync)
+{
+	/* Scan to collect results */
+	if (igt_kmemleak_scan())
+		if (!igt_kmemleak_append_to(last_test, resdirfd,
+					    kmemleak_each, sync))
+			return false;
+
+	if (kmemleak_each)
+		igt_kmemleak_clear();
+
+	return true;
+}
diff --git a/lib/igt_kmemleak.h b/lib/igt_kmemleak.h
new file mode 100644
index 000000000..cf7440384
--- /dev/null
+++ b/lib/igt_kmemleak.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef IGT_KMEMLEAK_H
+#define IGT_KMEMLEAK_H
+
+#include <stdbool.h>
+
+bool igt_kmemleak_init(const char *unit_test_kmemleak_file);
+bool igt_kmemleak(const char *last_test, int resdirfd, bool kmemleak_each,
+		  bool sync);
+
+#define KMEMLEAKRESFILENAME "kmemleak.txt"
+
+#endif /* IGT_KMEMLEAK_H */
diff --git a/lib/meson.build b/lib/meson.build
index 9fffdd3c6..7959dcacb 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -97,6 +97,7 @@ lib_sources = [
 	'igt_dummyload.c',
 	'igt_store.c',
 	'uwildmat/uwildmat.c',
+	'igt_kmemleak.c',
 	'igt_kmod.c',
 	'igt_ktap.c',
 	'igt_panfrost.c',
diff --git a/lib/tests/igt_kmemleak.c b/lib/tests/igt_kmemleak.c
new file mode 100644
index 000000000..5801d448c
--- /dev/null
+++ b/lib/tests/igt_kmemleak.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#include <ctype.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <zlib.h>
+
+#include "igt.h"
+#include "igt_kmemleak.h"
+
+const char *kmemleak_file_example =
+"unreferenced object 0xffff888102a2e638 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   00 00 00 00 00 00 00 00 0d 01 a2 00 00 00 00 00  ................\n"
+"   f0 7c 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .|..............\n"
+" backtrace (crc 2df71a7e):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2ed18 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   38 e6 a2 02 81 88 ff ff 0d 11 2d 00 00 00 00 00  8.........-.....\n"
+"   f2 7c 03 00 00 c9 ff ff 58 ea a2 02 81 88 ff ff  .|......X.......\n"
+" backtrace (crc ec2a8bdc):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2ea58 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   38 e6 a2 02 81 88 ff ff 0d 01 a0 00 00 00 00 00  8...............\n"
+"   f6 7c 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .|..............\n"
+" backtrace (crc f911c0d1):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e428 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   58 ea a2 02 81 88 ff ff 0d 01 35 00 00 00 00 00  X.........5.....\n"
+"   fc 7c 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .|..............\n"
+" backtrace (crc cb8aaffd):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e008 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   28 e4 a2 02 81 88 ff ff 0d 01 2d 00 00 00 00 00  (.........-.....\n"
+"   fc 7c 03 00 00 c9 ff ff c8 e2 a2 02 81 88 ff ff  .|..............\n"
+" backtrace (crc 7f883e78):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2b9e5>] acpi_ps_get_next_namepath+0x1f5/0x390\n"
+"   [<ffffffff81c2cc15>] acpi_ps_parse_loop+0x4a5/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e2c8 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   28 e4 a2 02 81 88 ff ff 0d 01 73 00 00 00 00 00  (.........s.....\n"
+"   00 7d 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .}..............\n"
+" backtrace (crc 338c016):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e378 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   c8 e2 a2 02 81 88 ff ff 0d 01 0d 00 00 00 00 00  ................\n"
+"   01 7d 03 00 00 c9 ff ff 98 e7 a2 02 81 88 ff ff  .}..............\n"
+" backtrace (crc 665fb8a7):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e798 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   7c8 e2 a2 02 81 88 ff ff 0d 01 98 00 00 00 00 00  ................\n"
+"   1b 7d 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .}..............\n"
+" backtrace (crc b7a23a1c):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170"
+"unreferenced object 0xffff888102a2e0b8 (size 80):\n"
+" comm \"swapper/0\", pid 1, jiffies 4294672730\n"
+" hex dump (first 32 bytes):\n"
+"   98 e7 a2 02 81 88 ff ff 0d 01 2d 00 00 00 00 00  ..........-.....\n"
+"   1c 7d 03 00 00 c9 ff ff 00 00 00 00 00 00 00 00  .}..............\n"
+" backtrace (crc 14d67a9c):\n"
+"   [<ffffffff824cd71b>] kmemleak_alloc+0x4b/0x80\n"
+"   [<ffffffff814e169b>] kmem_cache_alloc_noprof+0x2ab/0x370\n"
+"   [<ffffffff81c2f4dc>] acpi_ps_alloc_op+0xdc/0xf0\n"
+"   [<ffffffff81c2d650>] acpi_ps_create_op+0x1c0/0x400\n"
+"   [<ffffffff81c2c8dc>] acpi_ps_parse_loop+0x16c/0xa60\n"
+"   [<ffffffff81c2e94f>] acpi_ps_parse_aml+0x22f/0x5f0\n"
+"   [<ffffffff81c2fa82>] acpi_ps_execute_method+0x152/0x380\n"
+"   [<ffffffff81c233ed>] acpi_ns_evaluate+0x31d/0x5e0\n"
+"   [<ffffffff81c2a606>] acpi_evaluate_object+0x206/0x490\n"
+"   [<ffffffff81bf1202>] __acpi_power_off.isra.0+0x22/0x70\n"
+"   [<ffffffff81bf275b>] acpi_turn_off_unused_power_resources+0xbb/0xf0\n"
+"   [<ffffffff83867799>] acpi_scan_init+0x119/0x290\n"
+"   [<ffffffff8386711a>] acpi_init+0x23a/0x590\n"
+"   [<ffffffff81002c71>] do_one_initcall+0x61/0x3d0\n"
+"   [<ffffffff837dce32>] kernel_init_freeable+0x3e2/0x680\n"
+"   [<ffffffff824ca53b>] kernel_init+0x1b/0x170\n";
+
+static const char *igt_kmemleak_unit_testing_resdir = "/tmp";
+
+igt_main
+{
+	char unit_testing_kmemleak_filepath[256] = "/tmp/igt_kmemleak_test_XXXXXX";
+	int written_bytes;
+	int resdirfd;
+	int fd;
+
+	igt_fixture {
+		/* resdirfd is used by igt_kmemleak() to store results */
+		igt_assert(resdirfd = open(igt_kmemleak_unit_testing_resdir,
+					   O_DIRECTORY | O_RDONLY));
+
+		/* Try to delete results file in case of leftovers,
+		 * ignoring errors as the file may not exist
+		 */
+		unlinkat(resdirfd, KMEMLEAKRESFILENAME, 0);
+
+		/* Creating a fake kmemleak file for unit testing */
+		fd = mkstemp(unit_testing_kmemleak_filepath);
+		igt_assert(fd >= 0);
+
+		written_bytes = write(fd, kmemleak_file_example,
+				strlen(kmemleak_file_example));
+		igt_assert_eq(written_bytes, strlen(kmemleak_file_example));
+
+		close(fd);
+
+		/* Initializing igt_kmemleak with a fake kmemleak file
+		 * for unit testing
+		 */
+		igt_assert(igt_kmemleak_init(unit_testing_kmemleak_filepath));
+	}
+
+	igt_subtest_group {
+		igt_subtest("test_igt_kmemleak_once")
+			igt_assert(igt_kmemleak(NULL, resdirfd, false, false));
+
+		igt_subtest("test_igt_kmemleak_each") {
+			igt_assert(igt_kmemleak("test_name_1", resdirfd,
+						true, false));
+			igt_assert(igt_kmemleak("test_name_2", resdirfd,
+						true, false));
+			igt_assert(igt_kmemleak("test_name_3", resdirfd,
+						true, false));
+		}
+		igt_fixture {
+			close(resdirfd);
+		}
+	}
+	igt_fixture
+		unlinkat(resdirfd, KMEMLEAKRESFILENAME, 0);
+}
diff --git a/lib/tests/meson.build b/lib/tests/meson.build
index 1ce19f63c..5c42408d5 100644
--- a/lib/tests/meson.build
+++ b/lib/tests/meson.build
@@ -16,6 +16,7 @@ lib_tests = [
         'igt_ktap_parser',
 	'igt_list_only',
 	'igt_invalid_subtest_name',
+	'igt_kmemleak',
 	'igt_nesting',
 	'igt_no_exit',
 	'igt_runnercomms_packets',
-- 
2.34.1