Messaging patches

Volker Lendecke Volker.Lendecke at SerNet.DE
Tue Apr 29 09:03:22 MDT 2014


Hi!

Attached find a few patches for messaging3, one critical
bugfix (I believe). Right now autobuild is pretty flaky for
me, so I could not successfully run this through autobuild
yet. It does survive some simple tests for me though.

Posting it here for preliminary review, we need to wait I
guess until sn-devel settles down a bit again.

With best regards,

Volker Lendecke

-- 
SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
phone: +49-551-370000-0, fax: +49-551-370000-9
AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
http://www.sernet.de, mailto:kontakt at sernet.de
-------------- next part --------------
From 5af54afc20e4b701bd8a4bbd4ecc6d2acac580a2 Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:08:29 +0200
Subject: [PATCH 1/6] messaging3: Fix formatting

This went over the 80-char limit

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/lib/messages.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/source3/lib/messages.c b/source3/lib/messages.c
index b6fe423..9354ac8 100644
--- a/source3/lib/messages.c
+++ b/source3/lib/messages.c
@@ -526,7 +526,8 @@ static void messaging_read_cleanup(struct tevent_req *req,
 	}
 }
 
-static void messaging_read_done(struct tevent_req *req, struct messaging_rec *rec)
+static void messaging_read_done(struct tevent_req *req,
+				struct messaging_rec *rec)
 {
 	struct messaging_read_state *state = tevent_req_data(
 		req, struct messaging_read_state);
-- 
1.8.1.2


From d1c488b9455b12a3aaadd8eb2d524283076d6f88 Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:10:04 +0200
Subject: [PATCH 2/6] torture3: Add a bit more coverage to messaging_read

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/torture/test_dbwrap_watch.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/source3/torture/test_dbwrap_watch.c b/source3/torture/test_dbwrap_watch.c
index 4e699fe..ab9330f 100644
--- a/source3/torture/test_dbwrap_watch.c
+++ b/source3/torture/test_dbwrap_watch.c
@@ -67,6 +67,13 @@ bool run_dbwrap_watch1(int dummy)
 	}
 	TALLOC_FREE(rec);
 
+	status = dbwrap_store_int32_bystring(db, "different_key", 1);
+	if (!NT_STATUS_IS_OK(status)) {
+		fprintf(stderr, "dbwrap_store_int32 failed: %s\n",
+			nt_errstr(status));
+		goto fail;
+	}
+
 	status = dbwrap_store_int32_bystring(db, keystr, 1);
 	if (!NT_STATUS_IS_OK(status)) {
 		fprintf(stderr, "dbwrap_store_int32 failed: %s\n",
-- 
1.8.1.2


From d278cb542a0506324fd831344fcfda80ef5e54b6 Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:12:26 +0200
Subject: [PATCH 3/6] messaging3: Make "presult" optional in
 messaging_read_recv

Callers might not be interested in the rec, just the fact that something
arrived

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/lib/messages.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/source3/lib/messages.c b/source3/lib/messages.c
index 9354ac8..b0b2bb2 100644
--- a/source3/lib/messages.c
+++ b/source3/lib/messages.c
@@ -550,7 +550,9 @@ int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 		tevent_req_received(req);
 		return err;
 	}
-	*presult = talloc_move(mem_ctx, &state->rec);
+	if (presult != NULL) {
+		*presult = talloc_move(mem_ctx, &state->rec);
+	}
 	return 0;
 }
 
-- 
1.8.1.2


From f4915fb8c4f5b2d1a8e57f7d0d14122da782f41b Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:14:24 +0200
Subject: [PATCH 4/6] messaging3: Fix messaging_read_send/recv

messaging_read_send/recv was okay for just one handler in the queue. For
multiple handlers it was pretty broken.

A handler that deletes itself as part of the callback (pretty typical use
case...) drops the message for a subsequent handler that responds to the same
message type. In messaging_dispatch_rec we walk the array, however
messaging_read_cleanup has already changed the array. tevent_req_defer_callback
does not help here: It only defers the callback, it does not defer the cleanup
function.

This also happens when a callback deletes a different handler

A handler that re-installs itself in the callback might get a message twice.

This patch changes the code such that only messaging_dispatch_rec adds records
to msg_ctx->waiters, new waiters are put into a staging area first
(msg_ctx->new_waiters). Also messaging_read_cleanup does not move anything
around in msg_ctx->waiters, it only nulls out itself. messaging_dispatch_rec is
changed to cope with this.

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/include/messages.h |  3 ++
 source3/lib/messages.c     | 84 +++++++++++++++++++++++++++++++++++++---------
 2 files changed, 71 insertions(+), 16 deletions(-)

diff --git a/source3/include/messages.h b/source3/include/messages.h
index 1681ec9..06c1748 100644
--- a/source3/include/messages.h
+++ b/source3/include/messages.h
@@ -76,6 +76,9 @@ struct messaging_context {
 	struct tevent_context *event_ctx;
 	struct messaging_callback *callbacks;
 
+	struct tevent_req **new_waiters;
+	unsigned num_new_waiters;
+
 	struct tevent_req **waiters;
 	unsigned num_waiters;
 
diff --git a/source3/lib/messages.c b/source3/lib/messages.c
index b0b2bb2..e4fc4ec 100644
--- a/source3/lib/messages.c
+++ b/source3/lib/messages.c
@@ -475,7 +475,7 @@ struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
 {
 	struct tevent_req *req;
 	struct messaging_read_state *state;
-	size_t waiters_len;
+	size_t new_waiters_len;
 
 	req = tevent_req_create(mem_ctx, &state,
 				struct messaging_read_state);
@@ -486,21 +486,21 @@ struct tevent_req *messaging_read_send(TALLOC_CTX *mem_ctx,
 	state->msg_ctx = msg_ctx;
 	state->msg_type = msg_type;
 
-	waiters_len = talloc_array_length(msg_ctx->waiters);
+	new_waiters_len = talloc_array_length(msg_ctx->new_waiters);
 
-	if (waiters_len == msg_ctx->num_waiters) {
+	if (new_waiters_len == msg_ctx->num_new_waiters) {
 		struct tevent_req **tmp;
 
-		tmp = talloc_realloc(msg_ctx, msg_ctx->waiters,
-				     struct tevent_req *, waiters_len+1);
+		tmp = talloc_realloc(msg_ctx, msg_ctx->new_waiters,
+				     struct tevent_req *, new_waiters_len+1);
 		if (tevent_req_nomem(tmp, req)) {
 			return tevent_req_post(req, ev);
 		}
-		msg_ctx->waiters = tmp;
+		msg_ctx->new_waiters = tmp;
 	}
 
-	msg_ctx->waiters[msg_ctx->num_waiters] = req;
-	msg_ctx->num_waiters += 1;
+	msg_ctx->new_waiters[msg_ctx->num_new_waiters] = req;
+	msg_ctx->num_new_waiters += 1;
 	tevent_req_set_cleanup_fn(req, messaging_read_cleanup);
 
 	return req;
@@ -512,15 +512,20 @@ static void messaging_read_cleanup(struct tevent_req *req,
 	struct messaging_read_state *state = tevent_req_data(
 		req, struct messaging_read_state);
 	struct messaging_context *msg_ctx = state->msg_ctx;
-	struct tevent_req **waiters = msg_ctx->waiters;
 	unsigned i;
 
 	tevent_req_set_cleanup_fn(req, NULL);
 
 	for (i=0; i<msg_ctx->num_waiters; i++) {
-		if (waiters[i] == req) {
-			waiters[i] = waiters[msg_ctx->num_waiters-1];
-			msg_ctx->num_waiters -= 1;
+		if (msg_ctx->waiters[i] == req) {
+			msg_ctx->waiters[i] = NULL;
+			return;
+		}
+	}
+
+	for (i=0; i<msg_ctx->num_new_waiters; i++) {
+		if (msg_ctx->new_waiters[i] == req) {
+			msg_ctx->new_waiters[i] = NULL;
 			return;
 		}
 	}
@@ -556,6 +561,34 @@ int messaging_read_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 	return 0;
 }
 
+static bool messaging_append_new_waiters(struct messaging_context *msg_ctx)
+{
+	if (msg_ctx->num_new_waiters == 0) {
+		return true;
+	}
+
+	if (talloc_array_length(msg_ctx->waiters) <
+	    (msg_ctx->num_waiters + msg_ctx->num_new_waiters)) {
+		struct tevent_req **tmp;
+		tmp = talloc_realloc(
+			msg_ctx, msg_ctx->waiters, struct tevent_req *,
+			msg_ctx->num_waiters + msg_ctx->num_new_waiters);
+		if (tmp == NULL) {
+			DEBUG(1, ("%s: talloc failed\n", __func__));
+			return false;
+		}
+		msg_ctx->waiters = tmp;
+	}
+
+	memcpy(&msg_ctx->waiters[msg_ctx->num_waiters], msg_ctx->new_waiters,
+	       sizeof(struct tevent_req *) * msg_ctx->num_new_waiters);
+
+	msg_ctx->num_waiters += msg_ctx->num_new_waiters;
+	msg_ctx->num_new_waiters = 0;
+
+	return true;
+}
+
 /*
   Dispatch one messaging_rec
 */
@@ -578,14 +611,33 @@ void messaging_dispatch_rec(struct messaging_context *msg_ctx,
 		}
 	}
 
-	for (i=0; i<msg_ctx->num_waiters; i++) {
-		struct tevent_req *req = msg_ctx->waiters[i];
-		struct messaging_read_state *state = tevent_req_data(
-			req, struct messaging_read_state);
+	if (!messaging_append_new_waiters(msg_ctx)) {
+		return;
+	}
+
+	i = 0;
+	while (i < msg_ctx->num_waiters) {
+		struct tevent_req *req;
+		struct messaging_read_state *state;
+
+		req = msg_ctx->waiters[i];
+		if (req == NULL) {
+			/*
+			 * This got cleaned up in the meantime, get the one
+			 * from the end of the array
+			 */
+			msg_ctx->waiters[i] =
+				msg_ctx->waiters[msg_ctx->num_waiters-1];
+			msg_ctx->num_waiters -= 1;
+			continue;
+		}
 
+		state = tevent_req_data(req, struct messaging_read_state);
 		if (state->msg_type == rec->msg_type) {
 			messaging_read_done(req, rec);
 		}
+
+		i += 1;
 	}
 	return;
 }
-- 
1.8.1.2


From 22718e1c9f181ba02689a6dddac6f326038ae67b Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:25:14 +0200
Subject: [PATCH 5/6] torture3: Add local-messaging-read1

This covers deleting and re-adding a request in a callback

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/selftest/tests.py             |   1 +
 source3/torture/proto.h               |   1 +
 source3/torture/test_messaging_read.c | 144 ++++++++++++++++++++++++++++++++++
 source3/torture/torture.c             |   1 +
 source3/wscript_build                 |   1 +
 5 files changed, 148 insertions(+)
 create mode 100644 source3/torture/test_messaging_read.c

diff --git a/source3/selftest/tests.py b/source3/selftest/tests.py
index 4357ed9..7200329 100755
--- a/source3/selftest/tests.py
+++ b/source3/selftest/tests.py
@@ -102,6 +102,7 @@ local_tests = [
     "LOCAL-CONVERT-STRING",
     "LOCAL-CONV-AUTH-INFO",
     "LOCAL-IDMAP-TDB-COMMON",
+    "LOCAL-MESSAGING-READ1",
     "LOCAL-hex_encode_buf",
     "LOCAL-sprintf_append",
     "LOCAL-remove_duplicate_addrs2"]
diff --git a/source3/torture/proto.h b/source3/torture/proto.h
index 3673d98..f23efa1 100644
--- a/source3/torture/proto.h
+++ b/source3/torture/proto.h
@@ -113,5 +113,6 @@ bool run_idmap_tdb_common_test(int dummy);
 bool run_local_dbwrap_ctdb(int dummy);
 bool run_qpathinfo_bufsize(int dummy);
 bool run_bench_pthreadpool(int dummy);
+bool run_messaging_read1(int dummy);
 
 #endif /* __TORTURE_H__ */
diff --git a/source3/torture/test_messaging_read.c b/source3/torture/test_messaging_read.c
new file mode 100644
index 0000000..6c8cdba
--- /dev/null
+++ b/source3/torture/test_messaging_read.c
@@ -0,0 +1,144 @@
+/*
+   Unix SMB/CIFS implementation.
+   Test for a messaging_read bug
+   Copyright (C) Volker Lendecke 2014
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "torture/proto.h"
+#include "lib/util/tevent_unix.h"
+#include "messages.h"
+
+struct msg_count_state {
+	struct tevent_context *ev;
+	struct messaging_context *msg_ctx;
+	uint32_t msg_type;
+	unsigned *count;
+};
+
+static void msg_count_done(struct tevent_req *subreq);
+
+static struct tevent_req *msg_count_send(TALLOC_CTX *mem_ctx,
+					 struct tevent_context *ev,
+					 struct messaging_context *msg_ctx,
+					 uint32_t msg_type,
+					 unsigned *count)
+{
+	struct tevent_req *req, *subreq;
+	struct msg_count_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct msg_count_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->msg_ctx = msg_ctx;
+	state->msg_type = msg_type;
+	state->count = count;
+
+	subreq = messaging_read_send(state, state->ev, state->msg_ctx,
+				     state->msg_type);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, msg_count_done, req);
+	return req;
+}
+
+static void msg_count_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct msg_count_state *state = tevent_req_data(
+		req, struct msg_count_state);
+	int ret;
+
+	ret = messaging_read_recv(subreq, NULL, NULL);
+	TALLOC_FREE(subreq);
+	if (tevent_req_error(req, ret)) {
+		return;
+	}
+	*state->count += 1;
+
+	subreq = messaging_read_send(state, state->ev, state->msg_ctx,
+				     state->msg_type);
+	if (tevent_req_nomem(subreq, req)) {
+		return;
+	}
+	tevent_req_set_callback(subreq, msg_count_done, req);
+}
+
+bool run_messaging_read1(int dummy)
+{
+	struct tevent_context *ev = NULL;
+	struct messaging_context *msg_ctx = NULL;
+	struct tevent_req *req1 = NULL;
+	unsigned count1 = 0;
+	struct tevent_req *req2 = NULL;
+	unsigned count2 = 0;
+	NTSTATUS status;
+	bool retval = false;
+
+	ev = samba_tevent_context_init(talloc_tos());
+	if (ev == NULL) {
+		fprintf(stderr, "tevent_context_init failed\n");
+		goto fail;
+	}
+	msg_ctx = messaging_init(ev, ev);
+	if (msg_ctx == NULL) {
+		fprintf(stderr, "messaging_init failed\n");
+		goto fail;
+	}
+
+	req1 = msg_count_send(ev, ev, msg_ctx, MSG_SMB_NOTIFY, &count1);
+	if (req1 == NULL) {
+		fprintf(stderr, "msg_count_send failed\n");
+		goto fail;
+	}
+	req2 = msg_count_send(ev, ev, msg_ctx, MSG_SMB_NOTIFY, &count2);
+	if (req1 == NULL) {
+		fprintf(stderr, "msg_count_send failed\n");
+		goto fail;
+	}
+	status = messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
+				    MSG_SMB_NOTIFY, NULL, 0);
+	if (!NT_STATUS_IS_OK(status)) {
+		fprintf(stderr, "messaging_send_buf failed: %s\n",
+			nt_errstr(status));
+		goto fail;
+	}
+
+	if (tevent_loop_once(ev) != 0) {
+		fprintf(stderr, "tevent_loop_once failed\n");
+		goto fail;
+	}
+
+	printf("%u/%u\n", count1, count2);
+
+	if ((count1 != 1) || (count2 != 1)){
+		fprintf(stderr, "Got %u/%u msgs, expected 1 each\n",
+			count1, count2);
+		goto fail;
+	}
+
+	retval = true;
+fail:
+	TALLOC_FREE(req1);
+	TALLOC_FREE(req2);
+	TALLOC_FREE(msg_ctx);
+	TALLOC_FREE(ev);
+	return retval;
+}
diff --git a/source3/torture/torture.c b/source3/torture/torture.c
index 61e9338..5d75bbf 100644
--- a/source3/torture/torture.c
+++ b/source3/torture/torture.c
@@ -9574,6 +9574,7 @@ static struct {
 	{ "LOCAL-TALLOC-DICT", run_local_talloc_dict, 0},
 	{ "LOCAL-CTDB-CONN", run_ctdb_conn, 0},
 	{ "LOCAL-DBWRAP-WATCH1", run_dbwrap_watch1, 0 },
+	{ "LOCAL-MESSAGING-READ1", run_messaging_read1, 0 },
 	{ "LOCAL-BASE64", run_local_base64, 0},
 	{ "LOCAL-RBTREE", run_local_rbtree, 0},
 	{ "LOCAL-MEMCACHE", run_local_memcache, 0},
diff --git a/source3/wscript_build b/source3/wscript_build
index e9c2f91..f13aa63 100755
--- a/source3/wscript_build
+++ b/source3/wscript_build
@@ -1256,6 +1256,7 @@ bld.SAMBA3_BINARY('smbtorture' + bld.env.suffix3,
                  torture/test_idmap_tdb_common.c
                  torture/test_dbwrap_ctdb.c
                  torture/test_buffersize.c
+                 torture/test_messaging_read.c
                  torture/t_strappend.c
                  torture/bench_pthreadpool.c
                  torture/wbc_async.c''',
-- 
1.8.1.2


From 66277b7a50b7223b20637215b20be486e57b3a7a Mon Sep 17 00:00:00 2001
From: Volker Lendecke <vl at samba.org>
Date: Tue, 29 Apr 2014 14:27:03 +0200
Subject: [PATCH 6/6] torture3: Add a test deleting a different req

Signed-off-by: Volker Lendecke <vl at samba.org>
---
 source3/selftest/tests.py             |   1 +
 source3/torture/proto.h               |   1 +
 source3/torture/test_messaging_read.c | 103 ++++++++++++++++++++++++++++++++++
 source3/torture/torture.c             |   1 +
 4 files changed, 106 insertions(+)

diff --git a/source3/selftest/tests.py b/source3/selftest/tests.py
index 7200329..fcf3cd5 100755
--- a/source3/selftest/tests.py
+++ b/source3/selftest/tests.py
@@ -103,6 +103,7 @@ local_tests = [
     "LOCAL-CONV-AUTH-INFO",
     "LOCAL-IDMAP-TDB-COMMON",
     "LOCAL-MESSAGING-READ1",
+    "LOCAL-MESSAGING-READ2",
     "LOCAL-hex_encode_buf",
     "LOCAL-sprintf_append",
     "LOCAL-remove_duplicate_addrs2"]
diff --git a/source3/torture/proto.h b/source3/torture/proto.h
index f23efa1..a737ea4 100644
--- a/source3/torture/proto.h
+++ b/source3/torture/proto.h
@@ -114,5 +114,6 @@ bool run_local_dbwrap_ctdb(int dummy);
 bool run_qpathinfo_bufsize(int dummy);
 bool run_bench_pthreadpool(int dummy);
 bool run_messaging_read1(int dummy);
+bool run_messaging_read2(int dummy);
 
 #endif /* __TORTURE_H__ */
diff --git a/source3/torture/test_messaging_read.c b/source3/torture/test_messaging_read.c
index 6c8cdba..387ebfd 100644
--- a/source3/torture/test_messaging_read.c
+++ b/source3/torture/test_messaging_read.c
@@ -142,3 +142,106 @@ fail:
 	TALLOC_FREE(ev);
 	return retval;
 }
+
+struct msg_free_state {
+	struct tevent_req **to_free;
+};
+
+static void msg_free_done(struct tevent_req *subreq);
+
+static struct tevent_req *msg_free_send(TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct messaging_context *msg_ctx,
+					uint32_t msg_type,
+					struct tevent_req **to_free)
+{
+	struct tevent_req *req, *subreq;
+	struct msg_free_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct msg_free_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->to_free = to_free;
+
+	subreq = messaging_read_send(state, ev, msg_ctx, msg_type);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, msg_free_done, req);
+	return req;
+}
+
+static void msg_free_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct msg_free_state *state = tevent_req_data(
+		req, struct msg_free_state);
+	int ret;
+
+	ret = messaging_read_recv(subreq, NULL, NULL);
+	TALLOC_FREE(subreq);
+	if (tevent_req_error(req, ret)) {
+		return;
+	}
+	TALLOC_FREE(*state->to_free);
+	tevent_req_done(req);
+}
+
+bool run_messaging_read2(int dummy)
+{
+	struct tevent_context *ev = NULL;
+	struct messaging_context *msg_ctx = NULL;
+	struct tevent_req *req1 = NULL;
+	struct tevent_req *req2 = NULL;
+	unsigned count = 0;
+	NTSTATUS status;
+	bool retval = false;
+
+	ev = samba_tevent_context_init(talloc_tos());
+	if (ev == NULL) {
+		fprintf(stderr, "tevent_context_init failed\n");
+		goto fail;
+	}
+	msg_ctx = messaging_init(ev, ev);
+	if (msg_ctx == NULL) {
+		fprintf(stderr, "messaging_init failed\n");
+		goto fail;
+	}
+
+	req1 = msg_free_send(ev, ev, msg_ctx, MSG_SMB_NOTIFY, &req2);
+	if (req1 == NULL) {
+		fprintf(stderr, "msg_count_send failed\n");
+		goto fail;
+	}
+	req2 = msg_count_send(ev, ev, msg_ctx, MSG_SMB_NOTIFY, &count);
+	if (req1 == NULL) {
+		fprintf(stderr, "msg_count_send failed\n");
+		goto fail;
+	}
+	status = messaging_send_buf(msg_ctx, messaging_server_id(msg_ctx),
+				    MSG_SMB_NOTIFY, NULL, 0);
+	if (!NT_STATUS_IS_OK(status)) {
+		fprintf(stderr, "messaging_send_buf failed: %s\n",
+			nt_errstr(status));
+		goto fail;
+	}
+
+	if (!tevent_req_poll(req1, ev) != 0) {
+		fprintf(stderr, "tevent_req_poll failed\n");
+		goto fail;
+	}
+
+	if (count != 0) {
+		fprintf(stderr, "Got %u msgs, expected none\n", count);
+		goto fail;
+	}
+
+	retval = true;
+fail:
+	TALLOC_FREE(req1);
+	TALLOC_FREE(msg_ctx);
+	TALLOC_FREE(ev);
+	return retval;
+}
diff --git a/source3/torture/torture.c b/source3/torture/torture.c
index 5d75bbf..f97119a 100644
--- a/source3/torture/torture.c
+++ b/source3/torture/torture.c
@@ -9575,6 +9575,7 @@ static struct {
 	{ "LOCAL-CTDB-CONN", run_ctdb_conn, 0},
 	{ "LOCAL-DBWRAP-WATCH1", run_dbwrap_watch1, 0 },
 	{ "LOCAL-MESSAGING-READ1", run_messaging_read1, 0 },
+	{ "LOCAL-MESSAGING-READ2", run_messaging_read2, 0 },
 	{ "LOCAL-BASE64", run_local_base64, 0},
 	{ "LOCAL-RBTREE", run_local_rbtree, 0},
 	{ "LOCAL-MEMCACHE", run_local_memcache, 0},
-- 
1.8.1.2



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