Pim van Pelt 7ed77f5b22 Strip socket options on cross-cscf repeat listens (v0.7.2) ...

Make the shared-listen-include pattern work with `reuseport` and the
other socket-level listen options. Nginx core enforces at-most-once
per sockaddr on options that set lsopt.set=1 (reuseport, bind,
backlog=, rcvbuf=, sndbuf=, setfib=, fastopen=, accept_filter=,
deferred, ipv6only=, so_keepalive=) and emits "duplicate listen
options for <addr>" otherwise. That rule collides with a single
listens.conf included from every vhost — each vhost's include
re-submits the same options.

The listen wrapper now detects the cross-cscf case, strips those
options from cf->args before delegating to the core handler, and
logs one notice per stripped listen. The first cscf owns the
options on the kernel socket; later cscfs merge cleanly via
ngx_http_add_server. Protocol-level flags (ssl, http2, quic,
proxy_protocol) pass through untouched since nginx OR-merges those
across cscfs.

This unblocks `reuseport` for deployments that want better
new-connection spread across workers.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-19 16:23:58 +02:00

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