diff --git a/.regression.yml b/.regression.yml
index d86d6552a..8810bef53 100644
--- a/.regression.yml
+++ b/.regression.yml
@@ -14,7 +14,7 @@ clean:
 time_limit: 180
 
 features:
- - variant=release asserts=production invariant-checks=off debug-iterators=off
+ - variant=release asserts=production invariant-checks=off debug-iterators=off debug-symbols=on
  - encryption=openssl statistics=on logging=verbose disk-stats=on dht=logging request-log=on
  - ipv6=off dht=off extensions=off logging=none deprecated-functions=off 
 
diff --git a/src/kademlia/node.cpp b/src/kademlia/node.cpp
index fc37e302b..2912f2dbe 100644
--- a/src/kademlia/node.cpp
+++ b/src/kademlia/node.cpp
@@ -55,6 +55,10 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "ed25519.h"
 
+#ifdef TORRENT_USE_VALGRIND
+#include <valgrind/memcheck.h>
+#endif
+
 namespace libtorrent { namespace dht
 {
 
@@ -962,7 +966,14 @@ void node_impl::incoming_request(msg const& m, entry& e)
 			std::pair<char const*, int> buf = msg_keys[1]->data_section();
 			memcpy(seq + len, buf.first, buf.second);
 			len += buf.second;
+			TORRENT_ASSERT(len <= 1020);
 
+#ifdef TORRENT_USE_VALGRIND
+			VALGRIND_CHECK_MEM_IS_DEFINED(buf.first, buf.second);
+			VALGRIND_CHECK_MEM_IS_DEFINED(msg_keys[4]->string_ptr(), 64);
+			VALGRIND_CHECK_MEM_IS_DEFINED(msg_keys[3]->string_ptr(), 32);
+			VALGRIND_CHECK_MEM_IS_DEFINED(seq, len);
+#endif
 			// msg_keys[4] is the signature, msg_keys[3] is the public key
 			if (ed25519_verify((unsigned char const*)msg_keys[4]->string_ptr()
 				, (unsigned char const*)seq, len