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Bug: handshake_subscriber assigned bit + activated slot но НЕ tracked
client_fd. Когда subscriber container exited, socket closed on client side
но producer не detected → bit оставался set forever → после 32 connections
subscribe_create('cam-X'): too many subscribers (max 32).
Симптом в production: каждый pipeline recreate accumulated 1 stale subscriber.
После 4-5 recreate операций publishers перестали accept new pipeline →
"too many subscribers" crash loop.
Fix: после успешного handshake spawn detached pthread monitoring socket
via blocking recv(). recv() returns 0 (EOF) когда other side closes —
monitor clears bit (subscriber_bitmap &= ~(1<<bit)) + state[bit] = 0,
closes fd, exits.
Cost: 1 thread per active subscriber. Max 32 threads — небольшой
overhead. Threads detached, no join needed.
Stress test: 5x pipeline recreate без single "too many subscribers" error.
Раньше: 2-3 recreate → bitmap overflow.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>