- getrescaninfo takes no lock in dragonxd (it only reads wallet fields),
so the stub no longer holds it behind cs_main. Holding it there made
the GUI's rescan-progress poll look like an abandoned request every
30 s during a simulated rebuild.
- a `methods` event lists the 10 most-requested JSON-RPC methods with
counts (alongside `stats`, and at exit): what the GUI is polling.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Holds cs_main like a witness rebuild but logs no rebuild markers: a node
that is busy while its output says nothing (an external node, or a
rebuild path that prints no progress), for exercising the GUI's
"busy but alive" handling.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A scriptable fake dragonxd that reproduces, in minutes, the incident where
the GUI hard-killed a node busy with an hour-long witness rebuild:
- dragonxd's HTTP-RPC queue (8 workers + 16 queued, -rpcthreads /
-rpcworkqueue honoured): a full queue answers an immediate plain-text
500 "Work queue depth exceeded", and a request whose client gave up
keeps its slot until a worker reaches it
- a global cs_main held by a "witness rebuild" that logs the real
markers; every method except stop/help takes it
- warmup -28 with the daemon's allow-list, an optional startup replay
- dragonxd's shutdown order: stop (or SIGTERM on POSIX) unbinds RPC,
503s open connections, waits for the rebuild, then logs
"Shutdown: In progress..." / "Shutdown: done" and exits 0
Everything is appended to <datadir>/fake_dragonxd.events; a missing
"clean-exit" line means the process was killed. One portable C++17 file
(POSIX + Winsock), OFF by default (-DDRAGONX_BUILD_FAKE_DAEMON=ON), built
into <build>/fake_dragonxd/ so it can't shadow the real bin/dragonxd.
run-gui-with-fake.sh runs the GUI against it in a throwaway HOME.
Against master's GUI on Linux it reproduces the bug: closing during a
rebuild queues stop behind cs_main-blocked workers, then the GUI sends
SIGTERM and SIGKILL mid-rebuild, with no clean exit.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
DanSandClaude Opus 5.5