Live instrumentation on panthor: WLS reuse verified working (644 REUSE/46 ALLOC) but the
crash is dominated by the TLS *stack* alloc in emit_tls() at EndCommandBuffer — L-variant
matmul shader spills 10x more registers (tls_size 544->5328 B/thread => 38MB->304MB stack),
x~12 cmdbufs retained in the tls pool => ~3GB, over the 4GB priv heap. Remaining fix is
structural (free tls-pool BOs post-submit and/or fix the x19 sparse-core overallocation).
See docs/root-cause-final.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude (noether)
97629e935c