xarmian
7e20e29754
fix(server): two defects codex round 10 found INSIDE round 9's fixes (BUG-2726, BUG-2727)
...
Aiming a round at the previous round's fixes paid, which is the second
time this week that has been the sharpest angle available.
1. The lifecycle fix guarded the FIELDS and not the OPERATION. Stop
cleared started, released the lock, and only then cancelled and
waited — so a Start racing into that window installed a fresh loop the
in-flight Stop neither cancelled nor could end, while both shared one
WaitGroup. Start and Stop are now serialized end to end by a dedicated
lifecycleMu, deliberately not the state mutex, because probe() takes
that one on the goroutine Stop waits for.
2. The gauge fix made the callback reorderable. It captured the total
under the lock and fired outside it, so one admission could capture 1,
a concurrent one capture 2, and the stale 1 land last — leaving
pad_stream_connections_active permanently BELOW the real total, which
reads to an operator as spare capacity that is not there. The callback
now reads the total at notify time under a notify mutex, so whichever
fires last also read last and the gauge converges.
Both tests are concurrent, because the sequential ones structurally could
not see either defect — round 10 said so and it was right.
The gauge test needed a second pass to become an instrument. The first
version SURVIVED five runs against the broken build: the reorder window
is real but too narrow to hit reliably, so the test could not fail and
would have shipped as coverage that proves nothing. It now widens the
window deliberately with a sleep inside the observer, and the broken
build fails it by name (gauge = 9 against a true total of 8). The
lifecycle test catches its mutation as a data race plus a failure.
Claude-Session: https://claude.ai/code/session_01JVDBKbgn3Xt7ndW1YoYd8X
2026-08-22 03:51:27 +00:00
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