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myxce/.wolf/bugs/bug-1881.md
Rongsong Shen 8f51a4997d
chore(buglog): bug-1882 logged and fixed (f9146864); bug-1881 fix planned in spec libxce-alloc-preason-equality 
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-09-28 08:50:06 +00:00

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id status status_updated status_note component severity timestamp last_seen occurrences files tags related
bug-1881 open 2026-09-28 logged 2026-09-28; fix not started scheduler wrong-result 2026-09-28T07:26:09Z 2026-09-28T07:26:09Z 1
src/scheduler/src/sim_verify.c
scheduler
sim
sim-verify
logging

bug-1881: sim_log_mismatch prints identical expected/actual, hiding the field that differs

Description

Observed:

... MISMATCH ... -- expected: DISPATCH jobid=0-12-1790578108-0[49] nhosts=1 -- actual: DISPATCH jobid=0-12-1790578108-0[49] nhosts=1

Expected: the message names the field(s) that differ, with both values. Impact: a mismatch cannot be diagnosed from the log (bug-1880: 43 such lines, none showing the difference). Found by: user reading the bug-1880 replay log, 2026-09-28

UPDATE (2026-09-28): Fix planned in spec libxce-alloc-preason-equality (Requirement 3, Requirement 5.3, task 5): the libxce equality functions gain an optional why/whylen buffer describing the first difference, and sim_log_mismatch appends it to the MISMATCH line.

Environment

  • OS: NixOS 26.05 (Yarara); NixOS kernel; kernel Linux 6.18.33 x86_64
  • libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2)
  • Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
  • Build: debug (build.dbg)
  • Code: scheduler-framework @ 4c134127 (xce_scheduler --version: v0.0.0.1-4c134127-85e8fc00, built 2026-09-28T06:40:21Z)
  • Deployment: pc13v: xce_scheduler in simulation mode (pid 93231) replaying a capture of the live pc13v cluster's scheduler (scheduler-replay-20260928-064842.replay, captured from 06:48:42); exact command line and --sim-start-ts not recorded

Reproduction

  1. Any --sim-verify mismatch whose decisions differ only below the jobid/nhosts level (bug-1880's replay)
  • Frequency: deterministic (43/43 lines in the pc13v run)
  • Evidence: data/xce_scheduler.log

Root cause

sim_log_mismatch() (src/scheduler/src/sim_verify.c) summarizes each decision as kind + jobid + nhosts, while sim_decision_eq() also compares every host's allocations (resname, value, duration, reserve), so a difference there prints two identical summaries.

Fix

TODO: required for fixed/partial

Verification

  • Test: TODO: name + file; RED before the fix, GREEN after
  • Suites: TODO: suite results and build profile
  • Live: TODO: soak/deploy run, or n/a and why

References

  • Related: bug-1880