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feat(scheduler-core): implement scheduler-side admin request handler (task 9.4)

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Implements the scheduler's first request-reply opcode (OPCode_schedAdmin).
sched_handle_admin_request() (handler.c) decodes SchedAdminRequest and
dispatches by action: recordStatus answers synchronously (pure read);
recordStart/recordStop are deferred onto the existing pend_updates queue
(XCE_SCHED_OP_ADMIN_RECORD) since sched_record_start()'s snapshot call
requires the session_active==0 precondition only guaranteed on the driver
thread, not the async request-handling thread. driver.c's
xce_sched_driver_translate_pending_events() performs the deferred action
and sends the reply via a new xcecli_reply_schedadmin() (client.c/client.h),
correlated by seq copied before the original request is freed.

Adversarial review found a genuine cross-thread race: sched_record_status()
read driver-owned recording state (including a pointer the driver thread
frees) from the vtask thread with no lock -- the codebase's first such
race, missed by ASan (doesn't detect races). Fixed with a dedicated
record_lock scoped strictly to in-memory field access, never spanning file
I/O; sched_record_status() now strdup()s under the lock instead of
returning a borrowed live pointer. Verified with a real two-thread
lock-contention test (independently confirmed non-vacuous by removing the
lock and observing the test fail) plus a deterministic use-after-free
reproduction.

26/26 scheduler suite, clang-format clean.
This commit is contained in:
Rongsong Shen 2026-08-05 14:11:43 +00:00
parent 7494542a60
commit e819a50600
Signed by: rshen
SSH key fingerprint: SHA256:8Vf2pZ3h6rJa7EhGK+WaAQ9Mta/apZvteW6g9U/WKKk
19 changed files with 1761 additions and 115 deletions
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11
src/scheduler/testsuite/test_job_array_wire_e2e.c
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@ -79,6 +79,17 @@ int sched_init_config(xce_scheduler_t* s, xce_conf4sched_t* c)
return 0;
}
/* sched_record_status (recording.c, scheduler-core spec, task 9.4) --
* handler.c's OPCode_schedAdmin/recordStatus path references it; this file
* never exercises OPCode_schedAdmin, so a link-satisfying stub is enough,
* same rationale as sched_init_config above. */
int sched_record_status(xce_scheduler_t* sched, sched_admin_reply_t* reply)
{
(void)sched;
(void)reply;
return -EINVAL;
}
/* REAL kvmgr-backed job add/get -- same rtti path production uses (mirrors
* test_job_array_expand.c's precedent), needed so sched_on_job_array()'s
* per-element dedup check (sched_get_job) is exercised for real. Relocated