The "Fixes" commit mentioned below adds new MIBs counters to track some
particular cases that have been fixed by its parent commit 150d1e06c4f1
("mptcp: fix race in incoming ADD_ADDR option processing").

Unfortunately, one of the new MIB counter (AddAddrDrop) shares the same
prefix as an older one (AddAddr). This breaks one selftest because it
was doing a grep on "AddAddr" and it now gets 2 counters instead of 1.

This issue has been fixed upstream in a commit that was part of the same
set but not backported to v5.15, see commit 6ef84b1517e0 ("selftests:
mptcp: more robust signal race test"). It has not been backported
because it was fixing multiple things, some where for >v5.15.

This patch then simply extracts the only bit needed for v5.15. Now the
test passes when validating the last stable v5.15 kernel.

Fixes: f25ae162f4b3 ("mptcp: add mibs counter for ignored incoming options")
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
---
Hi Greg, Sasha,
Here is a fix just for v5.15, where f73c11946345 ("mptcp: add mibs
counter for ignored incoming options") has been backported but not
6ef84b1517e0 ("selftests: mptcp: more robust signal race test").
Thanks!
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 3be615ab1588..96a090e7f47e 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -732,7 +732,7 @@ chk_add_nr()
 	local dump_stats
 
 	printf "%-39s %s" " " "add"
-	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtAddAddr | awk '{print $2}'`
+	count=`ip netns exec $ns2 nstat -as MPTcpExtAddAddr | grep MPTcpExtAddAddr | awk '{print $2}'`
 	[ -z "$count" ] && count=0
 	if [ "$count" != "$add_nr" ]; then
 		echo "[fail] got $count ADD_ADDR[s] expected $add_nr"

---
base-commit: f48aeeaaa64c628519273f6007a745cf55b68d95
change-id: 20230428-upstream-stable-20230428-mptcp-addaddrdropmib-b078a0442078

Best regards,
-- 
Matthieu Baerts <matthieu.baerts@tessares.net>

This is a note to let you know that I've just added the patch titled

    selftests: mptcp: join: fix "invalid address, ADD_ADDR timeout"

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     selftests-mptcp-join-fix-invalid-address-add_addr-timeout.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From matthieu.baerts@tessares.net  Fri Apr 28 13:12:10 2023
From: Matthieu Baerts <matthieu.baerts@tessares.net>
Date: Fri, 28 Apr 2023 11:43:46 +0200
Subject: selftests: mptcp: join: fix "invalid address, ADD_ADDR timeout"
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Sasha Levin <sashal@kernel.org>
Cc: Mat Martineau <martineau@kernel.org>, Paolo Abeni <pabeni@redhat.com>, stable@vger.kernel.org, mptcp@lists.linux.dev, Matthieu Baerts <matthieu.baerts@tessares.net>
Message-ID: <20230428-upstream-stable-20230428-mptcp-addaddrdropmib-v1-1-51bca8b26c22@tessares.net>

From: Matthieu Baerts <matthieu.baerts@tessares.net>

The "Fixes" commit mentioned below adds new MIBs counters to track some
particular cases that have been fixed by its parent commit 150d1e06c4f1
("mptcp: fix race in incoming ADD_ADDR option processing").

Unfortunately, one of the new MIB counter (AddAddrDrop) shares the same
prefix as an older one (AddAddr). This breaks one selftest because it
was doing a grep on "AddAddr" and it now gets 2 counters instead of 1.

This issue has been fixed upstream in a commit that was part of the same
set but not backported to v5.15, see commit 6ef84b1517e0 ("selftests:
mptcp: more robust signal race test"). It has not been backported
because it was fixing multiple things, some where for >v5.15.

This patch then simply extracts the only bit needed for v5.15. Now the
test passes when validating the last stable v5.15 kernel.

Fixes: f25ae162f4b3 ("mptcp: add mibs counter for ignored incoming options")
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -732,7 +732,7 @@ chk_add_nr()
 	local dump_stats
 
 	printf "%-39s %s" " " "add"
-	count=`ip netns exec $ns2 nstat -as | grep MPTcpExtAddAddr | awk '{print $2}'`
+	count=`ip netns exec $ns2 nstat -as MPTcpExtAddAddr | grep MPTcpExtAddAddr | awk '{print $2}'`
 	[ -z "$count" ] && count=0
 	if [ "$count" != "$add_nr" ]; then
 		echo "[fail] got $count ADD_ADDR[s] expected $add_nr"


Patches currently in stable-queue which might be from matthieu.baerts@tessares.net are

queue-5.15/selftests-mptcp-join-fix-invalid-address-add_addr-timeout.patch