---
id: "bug-1554"
status: "fixed"
status_updated: "2026-09-24"
status_note: ""
component: "worker"
severity: "unknown"
timestamp: "2026-08-13T07:36:00Z"
last_seen: "2026-09-19T09:00:00Z"
occurrences: 2
files: ["src/worker/src/xcecd.c"]
tags: ["worker", "stub", "maxtmp", "hardware-detection", "maxswap"]
related: []
legacy: true
---

# bug-1554: workerlist / resval show maxswap=1024 and maxtmp=2048 for every host regardless of actual…

## Description
workerlist / resval show maxswap=1024 and maxtmp=2048 for every host regardless of actual hardware, unless overridden by a per-host config resource entry

## Environment
_Not recorded (migrated from buglog.json)._

## Reproduction
_Not recorded (migrated from buglog.json)._

## Root cause
init_host_attrs() hardcodes host_attrs.maxswap = 1024 and host_attrs.maxtmp = 2048 as placeholder constants (lines ~349-350) -- unlike maxcpus/maxmem, which come from real hardware_monitor_* detection, these two fields have no real detection implemented yet. Confirmed live: a deploy's maxtmp showed exactly 2048 (the hardcoded stub) while maxswap showed 10000 (a per-host config override in hosts.yaml resource list, taking precedence via apply_join_state's mark_host_res loop -- proves the stub IS reachable/live whenever no override exists).

## Fix
FIXED (2026-09-06, worker hardware detection). Real detection replaces both placeholder stubs: maxswap now comes from sysinfo()'s totalswap field (hardware_monitor_get_total_swap(), the same sysinfo() snapshot hardware_monitor_update() already takes for maxmem -- no extra syscall), and maxtmp now comes from a fresh statvfs("/tmp") total-capacity measurement (hardware_monitor_get_disk_info()), mirroring node_information.c's node_info_get_tmp() own statvfs("/tmp") convention but reporting total blocks*frsize instead of free space. init_host_attrs() (xcecd.c) wires both in, with NO synthetic fallback on detection failure (left at 0, matching maxcpus/maxmem's own existing no-fallback behavior) -- a system with swap genuinely disabled reports 0 correctly instead of a fabricated non-zero placeholder. New tests: test_hardware_monitor.c (7 tests, cross-checks each function's output against an independent sysinfo()/statvfs() call made directly in the test) and a new integration test in test_xcecd_startup_order.c pinning that init_host_attrs() picks up whatever these two functions report. Full worker suite: 9/9 pass.

## Verification
_Not recorded (migrated from buglog.json)._

## References
_Not recorded (migrated from buglog.json)._