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A session of 2026-11-13 grew from 683 to 1095 OS handles in 11 minutes, rising at every area load and never falling,
while the guest's own handles stayed at 116-122 and the threads flat; the VMA block count fell back while the handle
count did not. The log could not show it: the 600-frame "mem: sizes" line had only the guest's handles, and nothing
told which kind of handle grows.
kernel.c kern_sizes now adds "process handles" (plat_handle_count, one system call every 600 frames under trace=perf)
beside the guest's "handles". platform.h gets plat_handle_census: on Windows the system's extended handle table
filtered by our process id, with the type names from NtQueryObject's ObjectTypesInformation; on Linux the
/proc/self/fd links grouped by kind. It never opens, duplicates or names a handle (a name query can block on a pipe).
With NX2NAVI_HANDLE_CENSUS=1 (default 0, read at start) and trace=perf, perf.c starts one long-lived thread that the
600-frame report wakes; when the count grew by 16 or more since its last census it logs "mem: handles frame N: T in
all (+D since the last census): Event a (+x), ...". The census reads a few MiB of the system's table in 2-5 ms, off
the drawing threads; one thread for the run keeps a new thread's own handle out of what it counts. New cfg rows:
HANDLE_CENSUS in known[], sections[] (diagnostics) and metas[] ("0", "0|1", restart), and an nx2navi.ini.example
entry.
New tests/handle_census_check.py builds the platform layer alone: 20 events and 5 sections show as Event +20 and
Section +5, the total stays within 2 of GetProcessHandleCount, the figures return once they are closed, and kinds
past the room given go into the last entry; docs/building.md describes it. Not reproduced before the change (the
growth needs a game run). handle_census_check, sync_wake_check and the cfg row check pass; every runtime file compiles
with the dev flags, and perf.c, kernel.c, win32.c and cfg.c add no -Wall -Wextra warnings.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>