When a model method blocks (e.g. on a subprocess), swamp catches SIGINT/SIGTERM but never force-exits — repeated Ctrl-C has no effect and the run can only be ended with SIGKILL. There is also no cancellation signal exposed to a model's execute, so extensions have no way to abort in-flight work on interrupt.

Environment

swamp 20260711.232311.0-sha.6bda08e7 (Linux x86-64)

Evidence

The swamp process registers custom handlers for SIGINT/SIGTERM/SIGHUP:

/proc/<pid>/status
  SigCgt: 0000000100004443   # HUP + INT + TERM caught (custom handlers)

…but delivering those signals directly to the process does nothing — it stays in S (sleeping), frozen mid-method, holding the datastore .lock:

kill -INT  <pid>   # x3, ignored
kill -TERM <pid>   # ignored
kill -HUP  <pid>   # ignored
kill -KILL <pid>   # only this ends it

The handler waits indefinitely for the in-flight method promise to settle. If the method is blocked in an uncancellable call (e.g. await [HOST-1]() with no signal:), that promise never settles and the process is wedged.

Requested behavior (defense-in-depth)

Expose a per-run cancellation AbortSignal to model execute(args, context) so extensions can wire it into Deno.Command({ signal }) and other awaits.
On SIGINT: fire that signal (graceful cancel). On a second SIGINT (or after a short grace period), force-exit the process — releasing/soft-breaking the datastore lock — rather than waiting forever for the method.

Downstream extension-side instance of this (ssh child never aborted): Lab #1155.

02Bog Flow

Shipped

7/16/2026, 12:35:44 AM

Click a lifecycle step above to view its details.

03Sludge Pulse

stack72 assigned stack727/15/2026, 11:02:53 PM

stack72 commented 7/16/2026, 12:35:51 AM

Thanks @kneel for reporting this! The fix has been merged and a release is on its way. We appreciate your contribution to swamp.

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