+ ./leak 10
[harness] vclist head-order: carol@c bob@b alice@a 
[harness] 10 failing lookups (username 'nobody@nowhere' matches none)

=== VULNERABLE smb_sm_lookupint (sys/netproto/smb/smb_conn.c:123-180) ===
  call #0: rc=1 (nonzero => lookup FAILED), but *vcpp=alice@a (NOT NULL!)
  after 10 failed lookups:
    usecount[alice@a] = 11  (baseline 1, delta +10)
    usecount[bob@b]   = 1  (baseline 1, delta +0)
    usecount[carol@c] = 1  (baseline 1, delta +0)
    TOTAL leaked refs across all VCs = 10  (expected 10)
    every miss returned *vcpp=alice@a (WRONG VC: caller gets a ref to a VC
        that does NOT match the lookup, and never releases it)

=== FIXED smb_sm_lookupint (fix.diff applied) ===
  call #0: rc=1 (nonzero => lookup FAILED), *vcpp=(null) — correct: miss leaves caller's NULL intact
  after 10 failed lookups:
    usecount[alice@a] = 1  (baseline 1, delta +0)
    usecount[bob@b]   = 1  (baseline 1, delta +0)
    usecount[carol@c] = 1  (baseline 1, delta +0)
    TOTAL leaked refs across all VCs = 0  (expected 0)
    every miss returned *vcpp=(null) — caller cannot confuse a NULL VC for a real one

=== RESULT ===
REPRODUCED: vulnerable lookupint leaked 10 VC ref(s) across 10 miss(es);
FIXED:      patched lookupint leaked 0 ref(s) across 10 miss(es).
The stale `vcp` post-loop in sys/netproto/smb/smb_conn.c:175-178 is
the root cause; fix.diff closes it.
RUN_EXIT=0