---
id: "bug-1629"
status: "fixed"
status_updated: "2026-09-24"
status_note: ""
component: "scheduler"
severity: "crash"
timestamp: "2026-08-23T08:12:20"
last_seen: "2026-09-19T09:00:00Z"
occurrences: 1
files: ["src/scheduler/testsuite/test_scheduler_dispatch_commit.c"]
tags: ["scheduler", "testsuite", "zarray", "resource-accounting", "asan", "scheduler-dispatch-commit", "test-fixture"]
related: []
legacy: true
---

# bug-1629: AddressSanitizer SEGV in zarray_get_ex (lib/zarray.c:332) when a test-fixture…

## Description
AddressSanitizer SEGV in zarray_get_ex (lib/zarray.c:332) when a test-fixture xce_res_account_t.residx was never resolved from -1

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

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

## Root cause
zarray_get_ex() only guards idx >= array->caps before indexing array->data[idx]; it does NOT guard idx < 0. sched_update_res_accounts() (resource.c) resolves xce_res_account_t.residx from -1 to a real index via key_find()/add_vres() against core->resmgr ONLY when the host lookup (sched_get_worker()) and the surrounding call chain actually run to completion; if a test fixture never pre-registers the resource name in core->resmgr, sched_update_account()/sched_update_res_accounts() silently swallow the resolution failure (return values are discarded by sched_update_account()) and residx stays -1. A -1 index then passes the 'idx >= array->caps' bounds check (false, since caps starts at 0 too) and falls through to array->data[-1], an out-of-bounds/underflow read that ASAN reports as a high-address SEGV rather than a clean bounds error.

## Fix
In the test fixture, pre-register the resource with add_vres(&vres, core.resmgr, RES_NAME, 0) BEFORE calling the real charging path, and use the returned (non-negative) index for get_resvals()/put_resvals() calls, instead of relying on the production code's lazy first-use resolution path inside a minimal test fixture that never loads real resource config.

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

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