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chore(scheduler-allocator-runner): implementation complete; log bug-1897

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Feature validation GO (ASAN scheduler suite 96/96, smoke replay clean on
the allocation path). Roadmap entry marked implemented with follow-ups.

bug-1897 (found by the validation smoke run, not caused by this feature):
xce_scheduler --sim segfaults in limit_job_election on a job whose
snapshot resreq failed to parse (pre-bug-1888-fix replays).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Rongsong Shen 2026-09-30 10:20:39 +00:00
parent 28cff179b2
commit 1f932bf22d
Signed by untrusted user: rshen
GPG key ID: 80533536B0EB651C
4 changed files with 92 additions and 3 deletions
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27
.wolf/buglog.json
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@ -16658,6 +16658,33 @@
],
"fix_commits": [],
"record": ".wolf/bugs/bug-1896.md"
},
{
"id": "bug-1897",
"status": "open",
"status_updated": "2026-09-30",
"status_note": "newly logged",
"component": "scheduler",
"severity": "crash",
"timestamp": "2026-09-30T10:19:59Z",
"last_seen": "2026-09-30T10:19:59Z",
"occurrences": 1,
"error_message": "xce_scheduler --sim segfaults in limit_job_election on a job whose snapshot resreq failed to parse\n\n**Observed:** replaying `data/scheduler-replay-20260928-064842.replay` in simulation mode crashes before any decision, 3/3 runs:\n```\n[ERROR] [xce_sched_core_load_snapshot] xce_sched_core_load_snapshot parse_resreq failed for jobid 4667606771186008064: Primary: ...\n==2723571==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000008 (pc 0x555555a7cb6e ... T3)\n #0 limit_job_election ../scheduler/src/plugins/limit.c:336\n #1 plugin_job_election ../scheduler/src/plugin.c:601\n #2 sched_allocator ../scheduler/src/sched_election.c:236\n```\nThe replay's snapshot stores resreqs in the debug-dump format that bug-1888 wrote before its fix. Since the bug-1887 fix, `parse_resreq` rejects that text, so the snapshot loader logs the error but keeps the job with no schedobj. The allocator thread's job election then reads `job->schedobj` as NULL in the limit plugin.\n\n**Expected:** a job whose resreq cannot be parsed from a snapshot is either dropped (with the error logged) or kept pending with a reason, and never reaches election with a NULL schedobj; the simulator must not crash on an old replay.\n\n**Impact:** crash (SIGSEGV) of `xce_scheduler --sim` on any replay whose snapshot has unparsable resreqs, including every replay captured before the bug-1888 fix. Suspected: the same path could crash a normal-mode scheduler loading such a snapshot (not tried).\n\n**Found by:** feature-level validation smoke run of spec `scheduler-allocator-runner` (2026-09-30); not caused by that feature (limit.c, snapshot_load.c, sched_election.c untouched by it).",
"file": "src/scheduler/src/plugins/limit.c, src/scheduler/src/snapshot_load.c",
"root_cause": "TODO: required for fixed/partial",
"fix": "TODO: required for fixed/partial\n\nVerification:\n- Test: TODO: name + file; RED before the fix, GREEN after\n- Suites: TODO: suite results and build profile\n- Live: TODO: soak/deploy run, or n/a and why",
"tags": [
"scheduler",
"sim",
"snapshot",
"limit"
],
"related_bugs": [
"bug-1887",
"bug-1888"
],
"fix_commits": [],
"record": ".wolf/bugs/bug-1897.md"
}
]
}