[BugFix][HiMamba] Fix host-protected node deletion in HiMamba tombstone del (#23696)

Co-authored-by: diemchai <diemchai@tencent.com>
Co-authored-by: Zhangheng <hzh0425@apache.org>

python/sglang/srt/mem_cache/hi_mamba_radix_cache.py

@@ -632,6 +632,11 @@ class HiMambaRadixCache(MambaRadixCache):
                 break
             if node.parent.full_lock_ref > 0 or node.parent.mamba_lock_ref > 0:
                 break
+            if (
+                node.parent.host_ref_counter > 0
+                or node.parent.host_mamba_ref_counter > 0
+            ):
+                break
 
             parent = node.parent
 

python/sglang/srt/mem_cache/mamba_radix_cache.py

@@ -664,6 +664,7 @@ class MambaRadixCache(BasePrefixCache):
                 value=page_aligned_kv_indices,
                 mamba_value=mamba_value_forked,
                 prev_prefix_len=req.cache_protected_len,
+                chunked=chunked,
             )
         )
         new_prefix_len, mamba_exist = result.prefix_len, result.mamba_exist