chore(buglog): record Gitea sync state for bug-1871 (#297 ) and bug-1890 (#336 )

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-09-29 14:18:38 +00:00

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bug-1890: netio sockets leave Nagle on: last TLS records of a message burst arrive ~40 ms late

Description

Observed: a 9-chunk HA snapshot transfer is fully written by the primary within 1 ms, but the standby reads the last chunks ~40 ms later. Primary trace (xce-1871-fs1, ctrl-1) shows the final send drained at 13:20:33.967 (bug1871 upd ... 0x5->0x1 outq_empty=1 fsm_out=5); the standby logs:

[2026-09-29 13:20:33,969] ... ha_handle_snapshot_chunk: chunk crc32 checkpoint_lsn=114 chunk_index=6 ...
[2026-09-29 13:20:34,010] ... ha_handle_snapshot_chunk: chunk crc32 checkpoint_lsn=114 chunk_index=7 ...

Expected: on loopback the whole burst arrives within a few ms (most runs: max inter-chunk gap 1-4 ms). Impact: latency only, ~40 ms on the tail of a burst (snapshot/WAL batches, request-reply pairs after bulk data); no loss. grep -rn TCP_NODELAY src/lib finds nothing, so every netio TCP socket runs with Nagle, and a small trailing TLS record waits for the receiver's delayed ACK. Found by: soak -- bug-1871's instrumented force-snapshot runs, 2026-09-29. Suspected (not yet proven with TCP_NODELAY on): Nagle + delayed ACK.

Environment

OS: no /etc/os-release; Docker container; NixOS kernel; kernel Linux 6.18.33 x86_64
libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2)
Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
Build: asan (src/xce.build.bug1871, with temporary netio TRACE instrumentation)
Code: scheduler-framework @ 3444cf16
Deployment: local 3-node HA controller cluster (xce-test-ha --force-snapshot), localhost:9991-9993, 32 CPUs

Reproduction

nix develop ./src --command bash .claude/skills/xce-test-ha/run-ha-soak.sh --force-snapshot <dir>
On the rejoined standby's log, compute the gap between consecutive ha_handle_snapshot_chunk: chunk crc32 lines of one transfer; a ~40 ms gap (while the primary finished sending 1 ms earlier) is the symptom.

Frequency: 5/40 transfers had a 39-41 ms gap, 2026-09-29 (xce-1871-fs1..fs16)
Evidence: /home/claude/tmp/xce-1871-fs1, /home/claude/tmp/xce-1871-fs5, /home/claude/tmp/xce-1871-fs16 (ctrl-*.log)

Root cause

TODO: required for fixed/partial

Fix