reap_idle() is reached concurrently from attach_or_spawn() and the
background run_reaper loop, and each pop is followed by an awaited
close(); while one reap is parked inside close(), a second reap reaching
the same doomed key hit dict.pop(key) without a default and raised
KeyError straight into the websocket handler. close_all() has the same
overlap window against an in-flight reap.
Pop with a default and skip keys a concurrent reap already removed, so
overlapping reaps are idempotent. Which sessions get reaped is
unchanged.
Fixes#106400
(cherry picked from commit 8ea63a845424263551487886a7526ca2f4bbd1ee)
* fix(dashboard): prevent PTY input from blocking event loop
* fix(win-pty): don't terminate a healthy ConPTY on write cancellation; log leaked write workers
Review follow-up to the backpressure fix.
CancelledError on WinPtyBridge.write() ran the same path as a timeout and
force-terminated the ConPTY. Cancellation means the owning socket went away
mid-write, which is the keep-alive session's normal reattach case, not a
wedged child; killing the process there defeats the PTY-outlives-socket
design. Give the in-flight write the shutdown grace window and only
terminate if it never lands.
When terminate() fails to unblock pywinpty, the worker stays parked in the
default executor. That was swallowed by a bare except; log it so a slow
thread-pool starvation is diagnosable.
---------
Co-authored-by: Austin Pickett <pickett.austin@gmail.com>
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
Keep-alive path when ?attach=<token> is present: PTY outlives the socket
via PTY_REGISTRY, reattaches on reconnect. No token = unchanged legacy
pump (_legacy_pump). detach (not close) on disconnect.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
liuhao1024