chore(buglog): bug-1884 logged (ASAN --sim exits 1 on exit-time LeakSanitizer report)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.wolf/bugs/bug-1884.md

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+---
+id: "bug-1884"
+status: "open"
+status_updated: "2026-09-29"
+status_note: "newly logged"
+component: "scheduler"
+severity: "leak"
+timestamp: "2026-09-29T08:20:03Z"
+last_seen: "2026-09-29T08:20:03Z"
+occurrences: 1
+files: ["src/scheduler/src/sim_loop.c", "src/scheduler/src/sim.c", "src/scheduler/src/plugins/limit.c", "src/scheduler/src/main.c"]
+tags: ["scheduler", "sim", "asan", "lsan", "leak"]
+related: ["bug-1632", "bug-1763"]
+---
+
+# bug-1884: standalone ASAN xce_scheduler --sim exits 1: LeakSanitizer reports 17 MB still allocated at exit
+
+## Description
+**Observed:** an ASAN build of `xce_scheduler --sim=<file> --sim-verify`
+replays the whole recording (0 MISMATCH lines) and then exits 1 because
+LeakSanitizer reports at exit:
+```
+==2234882==ERROR: LeakSanitizer: detected memory leaks
+...
+SUMMARY: AddressSanitizer: 17041405 byte(s) leaked in 1187 allocation(s).
+```
+Of the 17,041,405 bytes, 17,036,261 are indirect and 5,144 direct.
+Grouped by first scheduler/lib frame (bytes, leak groups):
+- `kvtab_init` (lib/kv.c:106): 16,941,432 in 15 -- core kv tables, reachable only from leaked roots
+- `sim_process_replay_event_message` (sim_loop.c:403): 49,688 in 54 -- decoded replay events (e.g. `decode_JobStateChangeEvent_ptr`)
+- `xkvmgr_add` (lib/kvmgr.c:114): 21,376 in 9
+- `sim_locate_and_load_snapshot` (sim.c:224): 14,347 in 106 -- snapshot decode (`decode_Conf4Sched` / `decode_QueueConf_list`)
+- `put_resvals` (resource.c:99) via limit.c `update_limit_res_value` and `sched_update_res_accounts`: 2,048 in 2
+- smaller: `parse_resreq`, `core_build_job`, `sched_ctx_init`, `match_job_host_limit_`
+
+The indirect bulk fits the simulator never tearing down its core at exit
+(its picker/allocator threads are never joined, see bug-1632/bug-1763);
+the direct groups may include real per-event leaks.
+
+**Expected:** a clean replay exits 0 under ASAN with LeakSanitizer enabled,
+or the exit-time teardown frees what the driver owns.
+**Impact:** leak; for scripts, any ASAN `--sim` replay must set
+`ASAN_OPTIONS=detect_leaks=0` or its exit code is always 1, which masks real
+failures and hides any genuine per-event leak among the exit-time noise.
+Release builds are unaffected at exit; a per-event leak would still grow a
+long replay's memory.
+**Found by:** spec task (libxce-alloc-preason-equality 5.3, live
+default-settings replay, 2026-09-29)
+
+## Environment
+- OS: no /etc/os-release; Docker container; 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: asan (src/xce.build.discrete, debug + b_sanitize=address)
+- Code: scheduler-framework @ 4500ec46-dirty
+- Deployment: n/a (standalone simulation mode, no cluster); the replay file was recorded by a local 3-node HA soak (run-ha-soak.sh, 2 sequential rounds, xcecd_virtual worker) at /home/claude/tmp/xce-alloceq-53
+
+## Reproduction
+1. `bash src/tools/xce-build.sh scheduler asan` (or any ASAN build dir)
+2. `src/xce.build/scheduler/xce_scheduler --sim=/home/claude/tmp/bug-1884/scheduler-replay-20260929-064412.replay --sim-verify --logfile /tmp/sim.log; echo rc=$?`
+3. Observe `rc=1` and the LeakSanitizer SUMMARY on stderr. With `ASAN_OPTIONS=detect_leaks=0` the same run exits 0.
+- Frequency: deterministic (2/2 runs, identical totals, 2026-09-29); also seen on every recording of /home/claude/tmp/xce-ha-dc-soak
+- Evidence: /home/claude/tmp/bug-1884/lsan-report.txt (full report), /home/claude/tmp/bug-1884/scheduler-replay-20260929-064412.replay
+
+## Root cause
+TODO: required for fixed/partial
+
+## 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-1632, bug-1763 (sim picker/allocator threads never joined)
+- run-ha-soak.sh replay gate already runs `--sim` with `ASAN_OPTIONS=detect_leaks=0`