vms-4bd0: DLM harness H2 -- two real-executive QEMU nodes complete the full VMS$VAXcluster join

[baron-3dl]

DLM harness H2 (rd vms-4bd0) — two real-executive QEMU nodes complete the full VMS$VAXcluster join

Extends the H1 two-node real-/dev/vms QEMU harness (socket mcast netdev, no host bridge, no privilege, CI-runnable) from the 0x6007 HELLO transport (H1) to the full VMS$VAXcluster JOIN. With the join sequencer on — OVMX_MCAST_SOLICIT=1 OVMX_JOIN_SEQ=1, the same flags the Docker tests/cluster/two-ovmx harness completes the OVMX↔OVMX join with — each node climbs multicast HELLO → directed HELLO → 0x41 START / VC OPEN → the 8-step SCS$DIRECTORY/MSCP$DISK/VMS$VAXcluster sequencer → member-role 0x5b accept, and BOTH nodes reach SCSD-I-VAXCLMEMBER, inside QEMU, each on a real executive.

Scope discipline: JOIN/membership only. No OVMX_DLM_ENQ (the cross-node $ENQ is H3, the grant is H4). No change to the executive stub or DLM GRANT logic.

Files

• tests/qemu/init_dlm_h2.sh — PID 1; exports the sequencer flags, runs SCSD.EXE --connect, emits the NEW→MEMBER ladder + VAXCLMEMBER on ttyS1.
• tests/qemu/run_dlm_harness_h2.sh — boots both nodes; verdict asserts both reached SCSD-I-VAXCLMEMBER (mirrors tests/cluster/two-ovmx/verdict.sh); emits DLM HARNESS H2 PASSED / A_VAXCLMEMBER=1 B_VAXCLMEMBER=1. Default H2_DURATION=90 (matches the Docker harness's completing run).
• tests/qemu/Dockerfile.dlm-harness-h2 — same real-executive ingredients as H1 (vms.ko + static-musl SCSD.EXE + sca_l2probe + OVMXA/OVMXB SYSGEN stores).
• CI job dlm-harness-h2 under the dlm_harness path filter (KVM passthrough, TCG fallback, uploads pcap + node logs).

Proven locally (workshop, KVM), both nodes on a real /dev/vms

=== node A / node B: PASS: vms.ko loaded, /dev/vms present (char device)
ladder A: HELLOSENT DIRHELLO STARTTX STARTDONE VCOPEN OWNDIRBOUND MSCPBOUND CONNRESP VAXCLMEMBER CMCONFIG
ladder B: HELLOSENT DIRHELLO STARTTX STARTDONE VCOPEN OWNDIRBOUND MSCPBOUND CONNRESP VAXCLMEMBER CMCONFIG

A: SCSD-I-VAXCLMEMBER, VMS$VAXcluster SYSAP connection reached OPEN (conid=0xD85A0002 joiner-opened)
B: SCSD-I-VAXCLMEMBER, VMS$VAXcluster SYSAP connection reached OPEN (conid=0xFB0A0002 joiner-opened)
pcap: nodeA 235 frames (peer_seen=1), nodeB 238 frames (peer_seen=1)

highest rung A : SCSD-I-CMCONFIG
highest rung B : SCSD-I-CMCONFIG
verdict inputs: A_VAXCLMEMBER=1  B_VAXCLMEMBER=1

  DLM HARNESS H2 PASSED
  A_VAXCLMEMBER=1 B_VAXCLMEMBER=1

Container exit rc=0.

Real-executive finding

No defect surfaced. The stop-and-wait join sequencer that completes in the Docker two-ovmx harness also completes under real-executive QEMU boot/scheduling latency over the mcast socket netdev — the join reaches membership on both sides with no timing/collision-latch divergence. (H0 by contrast surfaced a missing REGISTER; H2's real-executive join is clean.)

🤖 Generated with Claude Code