TEMP_REFERENCE checkouts confirmed current (Tcl core 2026-07-07, tcludp
2026-07-05). core-9-0-branch carries no tclWinConsole.c fix since 9.0.2, so
the wedge - if in the console driver - is likely still present upstream.
Current driver architecture recorded (process-global gConsoleLock, console
handle list shared across all Tcl threads, per-handle SRWLOCKs, reader/writer
threads with CONDITION_VARIABLE wakeups + Tcl_ThreadAlert fan-out) as the
credible wedge surface. Worker-side hypothesis sharpened: std-channel init on
a worker's first channel creation (udp_open / log-file open) attaches it to
the shared console machinery when the process stdin handle is the console -
fits which workers wedge vs survive, though probes have not yet reproduced.
Probe 'adopt' variant added (main thread closes stdin, CONIN$ adopted into
the stdin slot, SetStdHandle, active reader) - clean, ruling out the last
easy stdin-arrangement candidate. Approach reordered: native thread stacks
of a wedged in-context specimen promoted to step 1 (no debugger installed
yet - tool options noted).
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Index entry recorded active per user. The detail file carries the full
investigation record: diagnosis chain of the piped-stdin exit/quit hang,
evidence and scoring caveats, ruled-out repro ingredients, remaining
candidates, and inline tooling listings (standalone probe script and the
hidden-console batch scorer with its 2026-07-08 baseline: punk902z run-2
syslog workers wedged 4/4, punksys 8.6 alive 4/4). Upstream reporting is the
user's manual step, gated on re-verifying against a Tcl 9 built from current
core sources.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Julian Noble