Function gdn_init_spine_line 

pub fn gdn_init_spine_line(tc_spine_bound: bool, scalar_entry: &str) -> String

2026-09-25: GDN state spine: …, the line qwen3_ssm::init prints for each layer as it binds the handles, before any prefill has run.

Why it is not simply the scalar entry’s name

With the tensor-core handle bound, the prefill launches GDN_TC_SPINE_ENTRY, and the scalar entry stays bound only as the fallback the prefill’s shape guards drop to. An init line that named the scalar entry would contradict the prefill’s line:

   48  qwen3_ssm::init: GDN state spine: gated_delta_rule_chunk_delta_h_vfused
14400  GDN state spine: gated_delta_rule_chunk_delta_h_tcfuse_x2 (…)

So the line follows the handle the probe resolved: bound, it names GDN_TC_SPINE_ENTRY; unbound, scalar_entry.