This is a v2 of:

https://lore.kernel.org/mptcp/ed5c5ea1de503f6dc8a514b5eb4c9d16c431646f.1762696333.git.pabeni@redhat.com/

It turns out the previous revision was prone to a lot of ugly race.
Addressing them needs a some pre-reqs.

Races are due to MPJ subflows racing with accept() and possibly adding
non accounted memory to the backlog while the account code is trying to
handle backlog_len.

Paolo Abeni (3):
  mptcp: fix grafting corner case
  Squash-to: "mptcp: fix memcg accounting for passive sockets"
  Squash-to: "mptcp: leverage the backlog for RX packet processing"

 net/mptcp/protocol.c | 104 +++++++++++++++++++++++++++++++++++--------
 net/mptcp/protocol.h |   1 +
 2 files changed, 87 insertions(+), 18 deletions(-)

-- 
2.51.1

Hi Paolo,

Thank you for your modifications, that's great!

Our CI did some validations and here is its report:

- KVM Validation: normal (except selftest_mptcp_join): Success! ✅
- KVM Validation: normal (only selftest_mptcp_join): Success! ✅
- KVM Validation: debug (except selftest_mptcp_join): Success! ✅
- KVM Validation: debug (only selftest_mptcp_join): Success! ✅
- KVM Validation: btf-normal (only bpftest_all): Success! ✅
- KVM Validation: btf-debug (only bpftest_all): Success! ✅
- Task: https://github.com/multipath-tcp/mptcp_net-next/actions/runs/19316383216

Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/42d108656927
Patchwork: https://patchwork.kernel.org/project/mptcp/list/?series=1022713


If there are some issues, you can reproduce them using the same environment as
the one used by the CI thanks to a docker image, e.g.:

    $ cd [kernel source code]
    $ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --privileged --rm -it \
        --pull always mptcp/mptcp-upstream-virtme-docker:latest \
        auto-normal

For more details:

    https://github.com/multipath-tcp/mptcp-upstream-virtme-docker


Please note that despite all the efforts that have been already done to have a
stable tests suite when executed on a public CI like here, it is possible some
reported issues are not due to your modifications. Still, do not hesitate to
help us improve that ;-)

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (NGI0 Core)

Hi Paolo,

Thank you for your modifications, that's great!

But sadly, our CI spotted some issues with it when trying to build it.

You can find more details there:

  https://github.com/multipath-tcp/mptcp_net-next/actions/runs/19316383224

Status: failure
Initiator: Patchew Applier
Commits: https://github.com/multipath-tcp/mptcp_net-next/commits/42d108656927
Patchwork: https://patchwork.kernel.org/project/mptcp/list/?series=1022713

Feel free to reply to this email if you cannot access logs, if you need
some support to fix the error, if this doesn't seem to be caused by your
modifications or if the error is a false positive one.

Cheers,
MPTCP GH Action bot
Bot operated by Matthieu Baerts (NGI0 Core)