tree a6eda29d2516a597edfcb3ca4e796b77fcecfdf0
parent 0c0f45971be67a6604258f4e47b7fcfd52bd26e5
author haoyuewang <haoyuewang@google.com> 1686943688 -0700
committer Copybara-Service <copybara-worker@google.com> 1686943750 -0700

Check if CID is missing in QuicConnection::WriteIfNotBlocked.

Without this change, write unexpectedly blocked QUIC BUG can be triggered when:
(1) Multiple UDP packets are processed for the same session in the same Epoll loop.
(2) Early packets schedule a send alarm.
(3) Later packets made destination CID unavailable.

Protected by FLAGS_quic_reloadable_flag_quic_write_is_blocked_when_cid_is_missing.

PiperOrigin-RevId: 540964630