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* [LTP] [PATCH v1] fanotify22.c: handle multiple asynchronous error events
@ 2026-03-04 13:38 Wei Gao via ltp
  2026-03-05  9:36 ` Jan Kara
  2026-03-09  7:59 ` [LTP] [PATCH v2] " Wei Gao via ltp
  0 siblings, 2 replies; 27+ messages in thread
From: Wei Gao via ltp @ 2026-03-04 13:38 UTC (permalink / raw)
  To: ltp; +Cc: kernel test robot, Jan Kara

Since the introduction of the asynchronous fserror reporting framework
(kernel commit 81d2e13a57c9), fanotify22 has encountered sporadic failures
due to the non-deterministic nature of event delivery and merging:

1) tcase3 failure: A race condition occurs when the test reads the
   notification fd between two events. Adding a short delay
   (usleep) ensures all events are dispatched and ready before the
   read() call.

2) tcase4 failure: The kernel may deliver errors as independent events
   instead of a single merged event, The test logic is updated to
   validate the expected error_count by either a single merged event
   or the accumulation of multiple independent events in the buffer.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202602042124.87bd00e3-lkp@intel.com
Signed-off-by: Wei Gao <wegao@suse.com>
---
 .../kernel/syscalls/fanotify/fanotify22.c     | 32 ++++++++++++++++---
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify22.c b/testcases/kernel/syscalls/fanotify/fanotify22.c
index 6578474a7..82eed7ba9 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify22.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify22.c
@@ -53,6 +53,8 @@ static struct fanotify_fid_t null_fid;
 static struct fanotify_fid_t bad_file_fid;
 static struct fanotify_fid_t bad_link_fid;
 
+static int event_count;
+
 static void trigger_fs_abort(void)
 {
 	SAFE_MOUNT(tst_device->dev, MOUNT_PATH, tst_device->fs_type,
@@ -88,7 +90,6 @@ static void trigger_bad_link_lookup(void)
 			ret, BAD_LINK, errno, EUCLEAN);
 }
 
-
 static void tcase3_trigger(void)
 {
 	trigger_bad_link_lookup();
@@ -176,9 +177,10 @@ static int check_error_event_info_error(struct fanotify_event_info_error *info_e
 {
 	int fail = 0;
 
-	if (info_error->error_count != ex->error_count) {
-		tst_res(TFAIL, "%s: Unexpected error_count (%d!=%d)",
-			ex->name, info_error->error_count, ex->error_count);
+	if (info_error->error_count != ex->error_count && event_count != ex->error_count) {
+		tst_res(TFAIL, "%s: Unexpected error_count (%d!=%d && %d!=%d)",
+			ex->name, info_error->error_count, ex->error_count,
+			event_count, ex->error_count);
 		fail++;
 	}
 
@@ -255,8 +257,30 @@ static void do_test(unsigned int i)
 
 	tcase->trigger_error();
 
+	usleep(100000);
+
 	read_len = SAFE_READ(0, fd_notify, event_buf, BUF_SIZE);
 
+	struct fanotify_event_metadata *metadata;
+	size_t len = read_len;
+
+	event_count = 0;
+
+	for (metadata = (struct fanotify_event_metadata *)event_buf;
+			FAN_EVENT_OK(metadata, len);
+			metadata = FAN_EVENT_NEXT(metadata, len)) {
+		event_count++;
+		struct fanotify_event_info_error *info_error = get_event_info_error(metadata);
+
+		if (info_error) {
+			tst_res(TINFO, "Event [%d]: errno=%d (expected %d), error_count=%d (expected total %d)",
+					event_count, info_error->error, tcase->error,
+					info_error->error_count, tcase->error_count);
+		} else {
+			tst_res(TINFO, "Event [%d]: No error info record found", event_count);
+		}
+	}
+
 	SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_REMOVE|FAN_MARK_FILESYSTEM,
 			   FAN_FS_ERROR, AT_FDCWD, MOUNT_PATH);
 
-- 
2.52.0


-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

^ permalink raw reply related	[flat|nested] 27+ messages in thread
* [LTP] [PATCH v6] io_submit04: Add test case for RWF_NOWAIT flag
@ 2026-03-17 11:46 Wei Gao via ltp
  2026-03-31 11:18 ` [LTP] [PATCH v7] fanotify22.c: handle multiple asynchronous error events Wei Gao via ltp
  0 siblings, 1 reply; 27+ messages in thread
From: Wei Gao via ltp @ 2026-03-17 11:46 UTC (permalink / raw)
  To: ltp

v5-v6:
- Changed fd checks to != -1 in cleanup function
- Replaced errno with TST_ERR for LTP macro consistency
- cleanup format issue for aio_abi.h

Fixes: #467
Signed-off-by: Wei Gao <wegao@suse.com>
---
 configure.ac                                  |  1 +
 include/lapi/aio_abi.h                        | 44 +++++++++
 runtest/syscalls                              |  1 +
 .../kernel/syscalls/io_submit/.gitignore      |  1 +
 .../kernel/syscalls/io_submit/io_submit04.c   | 99 +++++++++++++++++++
 5 files changed, 146 insertions(+)
 create mode 100644 include/lapi/aio_abi.h
 create mode 100644 testcases/kernel/syscalls/io_submit/io_submit04.c

diff --git a/configure.ac b/configure.ac
index 7fa614dcb..61462d192 100644
--- a/configure.ac
+++ b/configure.ac
@@ -172,6 +172,7 @@ AC_CHECK_FUNCS_ONCE([ \
 ])
 AC_CHECK_FUNCS(mkdtemp,[],AC_MSG_ERROR(mkdtemp() not found!))
 
+AC_CHECK_MEMBERS([struct iocb.aio_rw_flags],,,[#include <linux/aio_abi.h>])
 AC_CHECK_MEMBERS([struct fanotify_event_info_fid.fsid.__val],,,[#include <sys/fanotify.h>])
 AC_CHECK_MEMBERS([struct perf_event_mmap_page.aux_head],,,[#include <linux/perf_event.h>])
 AC_CHECK_MEMBERS([struct sigaction.sa_sigaction],[],[],[#include <signal.h>])
diff --git a/include/lapi/aio_abi.h b/include/lapi/aio_abi.h
new file mode 100644
index 000000000..ac78e5500
--- /dev/null
+++ b/include/lapi/aio_abi.h
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Wei Gao <wegao@suse.com>
+ */
+
+#ifndef LAPI_AIO_ABI_H__
+#define LAPI_AIO_ABI_H__
+
+#include <endian.h>
+#include <linux/aio_abi.h>
+
+#ifndef RWF_NOWAIT
+# define RWF_NOWAIT 0x00000008
+#endif
+
+struct iocb_fallback {
+	uint64_t aio_data;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	uint32_t   aio_key;
+	uint32_t aio_rw_flags;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	uint32_t aio_rw_flags;
+	uint32_t   aio_key;
+#else
+#error edit for your odd byteorder.
+#endif
+	uint16_t   aio_lio_opcode;
+	int16_t   aio_reqprio;
+	uint32_t   aio_fildes;
+	uint64_t   aio_buf;
+	uint64_t   aio_nbytes;
+	int64_t   aio_offset;
+	uint64_t   aio_reserved2;
+	uint32_t   aio_flags;
+	uint32_t   aio_resfd;
+};
+
+#ifndef HAVE_STRUCT_IOCB_AIO_RW_FLAGS
+typedef struct iocb_fallback iocb;
+#else
+typedef struct iocb iocb;
+#endif
+
+#endif /* LAPI_AIO_ABI_H__ */
diff --git a/runtest/syscalls b/runtest/syscalls
index 2179e007c..9812b1bfe 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -699,6 +699,7 @@ io_setup02 io_setup02
 io_submit01 io_submit01
 io_submit02 io_submit02
 io_submit03 io_submit03
+io_submit04 io_submit04
 
 keyctl01 keyctl01
 keyctl02 keyctl02
diff --git a/testcases/kernel/syscalls/io_submit/.gitignore b/testcases/kernel/syscalls/io_submit/.gitignore
index 60b07970a..abe962e1c 100644
--- a/testcases/kernel/syscalls/io_submit/.gitignore
+++ b/testcases/kernel/syscalls/io_submit/.gitignore
@@ -1,3 +1,4 @@
 /io_submit01
 /io_submit02
 /io_submit03
+/io_submit04
diff --git a/testcases/kernel/syscalls/io_submit/io_submit04.c b/testcases/kernel/syscalls/io_submit/io_submit04.c
new file mode 100644
index 000000000..3b8842da0
--- /dev/null
+++ b/testcases/kernel/syscalls/io_submit/io_submit04.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2025 Wei Gao <wegao@suse.com>
+ */
+
+/*\
+ * Test RWF_NOWAIT support in io_submit(), verifying that an
+ * asynchronous read operation on a blocking resource (empty pipe)
+ * will cause -EAGAIN. This is done by checking that io_getevents()
+ * syscall returns immediately and io_event.res is equal to -EAGAIN.
+ */
+
+#include "config.h"
+#include "tst_test.h"
+#include "lapi/syscalls.h"
+#include "lapi/aio_abi.h"
+
+#define BUF_SIZE 100
+
+static int fd[2] = {-1, -1};
+static aio_context_t ctx;
+static char *buf;
+static iocb *cb;
+static iocb **iocbs;
+
+static void setup(void)
+{
+	if (tst_syscall(__NR_io_setup, 1, &ctx))
+		tst_brk(TBROK | TERRNO, "io_setup failed");
+
+	SAFE_PIPE(fd);
+
+	cb->aio_fildes = fd[0];
+	cb->aio_lio_opcode = IOCB_CMD_PREAD;
+	cb->aio_buf = (uint64_t)buf;
+	cb->aio_offset = 0;
+	cb->aio_nbytes = BUF_SIZE;
+	cb->aio_rw_flags = RWF_NOWAIT;
+
+	iocbs[0] = cb;
+}
+
+static void cleanup(void)
+{
+	if (fd[0] != -1)
+		SAFE_CLOSE(fd[0]);
+
+	if (fd[1] != -1)
+		SAFE_CLOSE(fd[1]);
+
+	if (ctx)
+		if (tst_syscall(__NR_io_destroy, ctx))
+			tst_brk(TBROK | TERRNO, "io_destroy() failed");
+}
+
+static void run(void)
+{
+	struct io_event evbuf;
+	struct timespec timeout = { .tv_sec = 1 };
+	long nr = 1;
+
+	TEST(tst_syscall(__NR_io_submit, ctx, nr, iocbs));
+
+	if (TST_RET == -1 && TST_ERR == EOPNOTSUPP) {
+		tst_brk(TCONF, "RWF_NOWAIT not supported by kernel");
+	} else if (TST_RET != nr) {
+		tst_brk(TBROK | TTERRNO, "io_submit() returns %ld, expected %ld",
+				TST_RET, nr);
+	}
+
+	TEST(tst_syscall(__NR_io_getevents, ctx, 1, 1, &evbuf, &timeout));
+
+	if (TST_RET != 1) {
+		tst_res(TFAIL | TTERRNO, "io_getevents() failed to get 1 event");
+		return;
+	}
+
+	if (evbuf.res == -EAGAIN)
+		tst_res(TPASS, "io_getevents() returned EAGAIN on read event");
+	else
+		tst_res(TFAIL, "io_getevents() returned with %s instead of EAGAIN",
+			strerror(-evbuf.res));
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.needs_kconfigs = (const char *[]) {
+		"CONFIG_AIO=y",
+		NULL
+	},
+	.bufs = (struct tst_buffers []) {
+		{&buf, .size = BUF_SIZE},
+		{&cb, .size = sizeof(iocb)},
+		{&iocbs, .size = sizeof(iocb *)},
+		{},
+	}
+};
-- 
2.52.0


-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

^ permalink raw reply related	[flat|nested] 27+ messages in thread
* [LTP] [PATCH v7] fanotify22.c: handle multiple asynchronous error events
@ 2026-03-27 12:22 Wei Gao via ltp
  0 siblings, 0 replies; 27+ messages in thread
From: Wei Gao via ltp @ 2026-03-27 12:22 UTC (permalink / raw)
  To: ltp; +Cc: Jan Kara, kernel test robot

Since the introduction of the asynchronous fserror reporting framework
(kernel commit 81d2e13a57c9), fanotify22 has encountered sporadic failures
due to the non-deterministic nature of event delivery and merging:

1) tcase3 failure: A race condition occurs when the test reads the
   notification fd between two events. Use a poll() and read() loop to wait
   until the expected event.

2) tcase4 failure: The kernel may deliver errors as independent events
   instead of a single merged event, since different worker kthread can
   end up generating each event so they won't be merged. As suggested by
   Jan Kara, this patch introduces a consolidate_events() helper. It iterates
   through the event buffer, accumulates the error_count from all independent
   events, and updates the first event's count in-place.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202602042124.87bd00e3-lkp@intel.com
Suggested-by: Jan Kara <jack@suse.cz>
Cc: Andrea Cervesato <andrea.cervesato@suse.com>
Signed-off-by: Wei Gao <wegao@suse.com>
---
v6 -> v7:
- Replaced read() with SAFE_READ().
- Added TINFO message at the start of do_test().
- Removed redundant test case names from error messages.
- Improved buffer overflow check in do_test().

 .../kernel/syscalls/fanotify/fanotify22.c     | 110 +++++++++++++++---
 1 file changed, 94 insertions(+), 16 deletions(-)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify22.c b/testcases/kernel/syscalls/fanotify/fanotify22.c
index e8002b160..9a555c247 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify22.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify22.c
@@ -28,6 +28,7 @@
 #include "tst_test.h"
 #include <sys/fanotify.h>
 #include <sys/types.h>
+#include <poll.h>
 
 #ifdef HAVE_SYS_FANOTIFY_H
 #include "fanotify.h"
@@ -88,7 +89,6 @@ static void trigger_bad_link_lookup(void)
 			ret, BAD_LINK, errno, EUCLEAN);
 }
 
-
 static void tcase3_trigger(void)
 {
 	trigger_bad_link_lookup();
@@ -104,6 +104,7 @@ static void tcase4_trigger(void)
 static struct test_case {
 	char *name;
 	int error;
+	int error2;
 	unsigned int error_count;
 	struct fanotify_fid_t *fid;
 	void (*trigger_error)(void);
@@ -134,37 +135,79 @@ static struct test_case {
 		.trigger_error = &tcase4_trigger,
 		.error_count = 2,
 		.error = EFSCORRUPTED,
+		.error2 = ESHUTDOWN,
 		.fid = &bad_file_fid,
 	}
 };
 
+static size_t consolidate_events(char *buf, size_t len, const struct test_case *ex)
+{
+	struct fanotify_event_metadata *metadata, *first = NULL;
+	struct fanotify_event_info_error *first_info = NULL;
+	unsigned int total_count = 0;
+	int event_num = 0;
+
+	for (metadata = (struct fanotify_event_metadata *)buf;
+			FAN_EVENT_OK(metadata, len);
+			metadata = FAN_EVENT_NEXT(metadata, len)) {
+
+		event_num++;
+		struct fanotify_event_info_error *info = get_event_info_error(metadata);
+
+		if (!info) {
+			tst_res(TFAIL, "Event [%d] missing error info", event_num);
+			continue;
+		}
+
+		if (info->error != ex->error && (ex->error2 == 0 || info->error != ex->error2)) {
+			tst_res(TFAIL, "Event [%d] unexpected errno (%d)",
+					event_num, info->error);
+			continue;
+		}
+
+		if (!first) {
+			first = metadata;
+			first_info = info;
+		}
+		total_count += info->error_count;
+
+		tst_res(TINFO, "Event [%d]: errno=%d, error_count=%d",
+				event_num, info->error, info->error_count);
+	}
+
+	if (first_info)
+		first_info->error_count = total_count;
+
+	return (first) ? first->event_len : 0;
+}
+
 static int check_error_event_info_fid(struct fanotify_event_info_fid *fid,
 				 const struct test_case *ex)
 {
 	struct file_handle *fh = (struct file_handle *) &fid->handle;
 
 	if (memcmp(&fid->fsid, &ex->fid->fsid, sizeof(fid->fsid))) {
-		tst_res(TFAIL, "%s: Received bad FSID type (%x...!=%x...)",
-			ex->name, FSID_VAL_MEMBER(fid->fsid, 0),
+		tst_res(TFAIL, "Received bad FSID type (%x...!=%x...)",
+			FSID_VAL_MEMBER(fid->fsid, 0),
 			ex->fid->fsid.val[0]);
 
 		return 1;
 	}
 	if (fh->handle_type != ex->fid->handle.handle_type) {
-		tst_res(TFAIL, "%s: Received bad file_handle type (%d!=%d)",
-			ex->name, fh->handle_type, ex->fid->handle.handle_type);
+		tst_res(TFAIL, "Received bad file_handle type (%d!=%d)",
+			fh->handle_type, ex->fid->handle.handle_type);
 		return 1;
 	}
 
 	if (fh->handle_bytes != ex->fid->handle.handle_bytes) {
-		tst_res(TFAIL, "%s: Received bad file_handle len (%d!=%d)",
-			ex->name, fh->handle_bytes, ex->fid->handle.handle_bytes);
+		tst_res(TFAIL, "Received bad file_handle len (%d!=%d)",
+			fh->handle_bytes, ex->fid->handle.handle_bytes);
 		return 1;
 	}
 
 	if (memcmp(fh->f_handle, ex->fid->handle.f_handle, fh->handle_bytes)) {
-		tst_res(TFAIL, "%s: Received wrong handle. "
-			"Expected (%x...) got (%x...) ", ex->name,
+		tst_res(TFAIL, "Received wrong handle. "
+			"Expected (%x...) got (%x...) ",
 			*(int *)ex->fid->handle.f_handle, *(int *)fh->f_handle);
 		return 1;
 	}
@@ -177,14 +220,14 @@ static int check_error_event_info_error(struct fanotify_event_info_error *info_e
 	int fail = 0;
 
 	if (info_error->error_count != ex->error_count) {
-		tst_res(TFAIL, "%s: Unexpected error_count (%d!=%d)",
-			ex->name, info_error->error_count, ex->error_count);
+		tst_res(TFAIL, "Unexpected error_count (%d!=%d)",
+			info_error->error_count, ex->error_count);
 		fail++;
 	}
 
 	if (info_error->error != ex->error) {
-		tst_res(TFAIL, "%s: Unexpected error code value (%d!=%d)",
-			ex->name, info_error->error, ex->error);
+		tst_res(TFAIL, "Unexpected error code value (%d!=%d)",
+			info_error->error, ex->error);
 		fail++;
 	}
 
@@ -248,19 +291,54 @@ static void check_event(char *buf, size_t len, const struct test_case *ex)
 static void do_test(unsigned int i)
 {
 	const struct test_case *tcase = &testcases[i];
-	size_t read_len;
+	size_t read_len = 0;
+	struct pollfd pfd;
+	unsigned int accumulated_count = 0;
+
+	tst_res(TINFO, "Test case: %s", tcase->name);
 
 	SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_ADD|FAN_MARK_FILESYSTEM,
 			   FAN_FS_ERROR, AT_FDCWD, MOUNT_PATH);
 
 	tcase->trigger_error();
 
-	read_len = SAFE_READ(0, fd_notify, event_buf, BUF_SIZE);
+	pfd.fd = fd_notify;
+	pfd.events = POLLIN;
+
+	while (accumulated_count < tcase->error_count) {
+		if (poll(&pfd, 1, 5000) <= 0) {
+			tst_res(TFAIL, "Timeout waiting for events");
+			goto out;
+		}
+
+		if (BUF_SIZE - read_len < FAN_EVENT_METADATA_LEN)
+			tst_brk(TBROK, "Insufficient buffer space for next event");
+
+		char *current_pos = event_buf + read_len;
+		ssize_t ret = SAFE_READ(0, fd_notify, current_pos, BUF_SIZE - read_len);
+
+		struct fanotify_event_metadata *m =
+			(struct fanotify_event_metadata *)current_pos;
+		while (FAN_EVENT_OK(m, ret)) {
+			struct fanotify_event_info_error *e = get_event_info_error(m);
+
+			if (e)
+				accumulated_count += e->error_count;
+
+			read_len += m->event_len;
+			m = FAN_EVENT_NEXT(m, ret);
+		}
+	}
+
+	read_len = consolidate_events(event_buf, read_len, tcase);
+
+	check_event(event_buf, read_len, tcase);
+
+out:
 
 	SAFE_FANOTIFY_MARK(fd_notify, FAN_MARK_REMOVE|FAN_MARK_FILESYSTEM,
 			   FAN_FS_ERROR, AT_FDCWD, MOUNT_PATH);
 
-	check_event(event_buf, read_len, tcase);
 	/* Unmount and mount the filesystem to get it out of the error state */
 	SAFE_UMOUNT(MOUNT_PATH);
 	SAFE_MOUNT(tst_device->dev, MOUNT_PATH, tst_device->fs_type, 0, NULL);
-- 
2.52.0


-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

^ permalink raw reply related	[flat|nested] 27+ messages in thread
end of thread, other threads:[~2026-03-31 11:19 UTC | newest]

Thread overview: 27+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-04 13:38 [LTP] [PATCH v1] fanotify22.c: handle multiple asynchronous error events Wei Gao via ltp
2026-03-05  9:36 ` Jan Kara
2026-03-05 14:36   ` Wei Gao via ltp
2026-03-05 15:50     ` Jan Kara
2026-03-06  4:50       ` Wei Gao via ltp
2026-03-06 12:24         ` Petr Vorel
2026-03-06 15:19         ` Jan Kara
2026-03-09  7:59 ` [LTP] [PATCH v2] " Wei Gao via ltp
2026-03-09 10:26   ` Andrea Cervesato via ltp
2026-03-09 11:29   ` Jan Kara
2026-03-18  6:46   ` [LTP] [PATCH v3] " Wei Gao via ltp
2026-03-18 18:18     ` Jan Kara
2026-03-24 11:55     ` Andrea Cervesato via ltp
2026-03-25 12:43     ` [LTP] [PATCH v4] " Wei Gao via ltp
2026-03-25 15:52       ` Jan Kara
2026-03-26  1:28       ` [LTP] [PATCH v5] " Wei Gao via ltp
2026-03-26  8:57         ` Jan Kara
2026-03-26  9:40         ` Andrea Cervesato via ltp
2026-03-27  4:55         ` [LTP] [PATCH v6] " Wei Gao via ltp
2026-03-27  9:07           ` Andrea Cervesato via ltp
2026-03-27 12:33           ` [LTP] [PATCH v7] " Wei Gao via ltp
2026-03-27 14:19             ` Andrea Cervesato via ltp
2026-03-28  0:44               ` Wei Gao via ltp
2026-03-30  7:17                 ` Andrea Cervesato via ltp
2026-03-30  7:36                 ` Jan Kara
  -- strict thread matches above, loose matches on Subject: below --
2026-03-17 11:46 [LTP] [PATCH v6] io_submit04: Add test case for RWF_NOWAIT flag Wei Gao via ltp
2026-03-31 11:18 ` [LTP] [PATCH v7] fanotify22.c: handle multiple asynchronous error events Wei Gao via ltp
2026-03-27 12:22 Wei Gao via ltp

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