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Matthieu Baerts (NGI0) ee8d393af3 selftests: mptcp: avoid spurious errors on TCP disconnect 
commit 8708c5d8b3fb3f6d5d3b9e6bfe01a505819f519a 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>
2025-09-25 11:16:50 +02:00
arch KVM: SVM: Sync TPR from LAPIC into VMCB::V_TPR even if AVIC is active 2025-09-25 11:16:49 +02:00
block block: don't silently ignore metadata for sync read/write 2025-09-19 16:37:26 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg 2025-09-25 11:16:45 +02:00
Documentation doc/netlink: Fix typos in operation attributes 2025-09-25 11:16:44 +02:00
drivers crypto: ccp - Always pass in an error pointer to __sev_platform_shutdown_locked() 2025-09-25 11:16:50 +02:00
fs btrfs: tree-checker: fix the incorrect inode ref size check 2025-09-25 11:16:48 +02:00
include ASoC: SDCA: Add quirk for incorrect function types for 3 systems 2025-09-25 11:16:48 +02:00
init io_uring: fix breakage in EXPERT menu 2025-08-15 16:38:23 +02:00
io_uring io_uring: include dying ring in task_work "should cancel" state 2025-09-25 11:16:50 +02:00
ipc - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
kernel Revert "sched_ext: Skip per-CPU tasks in scx_bpf_reenqueue_local()" 2025-09-25 11:16:46 +02:00
lib lib/sbitmap: convert shallow_depth from one word to the whole sbitmap 2025-08-20 18:41:31 +02:00
LICENSES LICENSES: add CC0-1.0 license text 2025-05-21 14:54:17 +02:00
mm mm: folio_may_be_lru_cached() unless folio_test_large() 2025-09-25 11:16:46 +02:00
net mptcp: propagate shutdown to subflows when possible 2025-09-25 11:16:50 +02:00
rust rust: mm: mark VmaNew as transparent 2025-09-09 19:02:29 +02:00
samples ftrace/samples: Fix function size computation 2025-09-19 16:37:28 +02:00
scripts rust: support Rust >= 1.91.0 target spec 2025-09-09 19:02:35 +02:00
security apparmor: Fix 8-byte alignment for initial dfa blob streams 2025-08-28 16:34:16 +02:00
sound ASoC: qcom: q6apm-lpass-dais: Fix missing set_fmt DAI op for I2S 2025-09-25 11:16:48 +02:00
tools selftests: mptcp: avoid spurious errors on TCP disconnect 2025-09-25 11:16:50 +02:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt KVM: Allow CPU to reschedule while setting per-page memory attributes 2025-06-24 12:20:17 -07:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
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.cocciconfig
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.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
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.gitignore gitignore: allow .pylintrc to be tracked 2025-08-15 16:39:03 +02:00
.mailmap 11 hotfixes. 9 are cc:stable and the remainder address post-6.15 issues 2025-07-24 19:13:30 -07:00
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.rustfmt.toml
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CREDITS mm: update MAINTAINERS entry for HMM 2025-07-19 19:26:16 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS 11 hotfixes. 9 are cc:stable and the remainder address post-6.15 issues 2025-07-24 19:13:30 -07:00
Makefile Linux 6.16.8 2025-09-19 16:37:39 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README

Linux kernel

There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first.

In order to build the documentation, use make htmldocs or make pdfdocs. The formatted documentation can also be read online at:

https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory, several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.