Commit 1a3011cc0 for llama.cpp

commit 1a3011cc0c183f184849b5fa4fa15ab0399f17d8
Author: Piotr Wilkin (ilintar) <piotr.wilkin@syndatis.com>
Date:   Tue Oct 6 10:41:23 2026 +0200

    llama : re-reserve the sched when the nextn extraction flags change (#30020)

    The speculative MTP init enables NextN extraction on the target and draft
    contexts after both were created and their schedulers reserved. With
    unmasked extraction the trunk graph keeps every token through the last
    layer instead of cropping to the output rows, so the first decode
    reallocates to that batch's shape and the next, wider batch trips
    GGML_SCHED_DEBUG_REALLOC. Invalidate the reserve when the flags change so
    the next compute re-reserves with the new graph shape.

    Assisted-by: Claude

diff --git a/src/llama-context.cpp b/src/llama-context.cpp
index 70b7c21af..ff2ea461c 100644
--- a/src/llama-context.cpp
+++ b/src/llama-context.cpp
@@ -1234,6 +1234,11 @@ void llama_context::set_embeddings(bool value) {
 void llama_context::set_embeddings_nextn(bool value, bool masked) {
     LLAMA_LOG_DEBUG("%s: value = %d, masked = %d\n", __func__, value, masked);

+    if (cparams.embeddings_nextn != value || cparams.embeddings_nextn_masked != masked) {
+        // these flags change the graph shape
+        sched_need_reserve = true;
+    }
+
     cparams.embeddings_nextn        = value;
     cparams.embeddings_nextn_masked = masked;
 }