commit 8708c5d8b3 upstream.
The disconnect test-case, with 'plain' TCP sockets generates spurious
errors, e.g.
07 ns1 TCP -> ns1 (dead:beef:1::1:10006) MPTCP
read: Connection reset by peer
read: Connection reset by peer
(duration 155ms) [FAIL] client exit code 3, server 3
netns ns1-FloSdv (listener) socket stat for 10006:
TcpActiveOpens 2 0.0
TcpPassiveOpens 2 0.0
TcpEstabResets 2 0.0
TcpInSegs 274 0.0
TcpOutSegs 276 0.0
TcpOutRsts 3 0.0
TcpExtPruneCalled 2 0.0
TcpExtRcvPruned 1 0.0
TcpExtTCPPureAcks 104 0.0
TcpExtTCPRcvCollapsed 2 0.0
TcpExtTCPBacklogCoalesce 42 0.0
TcpExtTCPRcvCoalesce 43 0.0
TcpExtTCPChallengeACK 1 0.0
TcpExtTCPFromZeroWindowAdv 42 0.0
TcpExtTCPToZeroWindowAdv 41 0.0
TcpExtTCPWantZeroWindowAdv 13 0.0
TcpExtTCPOrigDataSent 164 0.0
TcpExtTCPDelivered 165 0.0
TcpExtTCPRcvQDrop 1 0.0
In the failing scenarios (TCP -> MPTCP), the involved sockets are
actually plain TCP ones, as fallbacks for passive sockets at 2WHS time
cause the MPTCP listeners to actually create 'plain' TCP sockets.
Similar to commit 218cc16632 ("selftests: mptcp: avoid spurious errors
on disconnect"), the root cause is in the user-space bits: the test
program tries to disconnect as soon as all the pending data has been
spooled, generating an RST. If such option reaches the peer before the
connection has reached the closed status, the TCP socket will report an
error to the user-space, as per protocol specification, causing the
above failure. Note that it looks like this issue got more visible since
the "tcp: receiver changes" series from commit 06baf9bfa6 ("Merge
branch 'tcp-receiver-changes'").
Address the issue by explicitly waiting for the TCP sockets (-t) to
reach a closed status before performing the disconnect. More precisely,
the test program now waits for plain TCP sockets or TCP subflows in
addition to the MPTCP sockets that were already monitored.
While at it, use 'ss' with '-n' to avoid resolving service names, which
is not needed here.
Fixes: 218cc16632 ("selftests: mptcp: avoid spurious errors on disconnect")
Cc: stable@vger.kernel.org
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Reviewed-by: Geliang Tang <geliang@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250912-net-mptcp-fix-sft-connect-v1-3-d40e77cbbf02@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
acab5c56a6