diff --git a/ircd/db_env.cc b/ircd/db_env.cc
index d9ac66300..39cafd1de 100644
--- a/ircd/db_env.cc
+++ b/ircd/db_env.cc
@@ -3421,6 +3421,7 @@ const noexcept try
 		fs::read(fd, buf, opts)
 	};
 
+	assert(!opts.all || size(read) == length);
 	*result = slice(read);
 	return Status::OK();
 }
@@ -3862,6 +3863,7 @@ const noexcept try
 		fs::read(fd, buf, opts)
 	};
 
+	assert(!opts.all || size(read) == length);
 	*result = slice(read);
 	return Status::OK();
 }
diff --git a/ircd/fs.cc b/ircd/fs.cc
index 714733c3e..74210d7e7 100644
--- a/ircd/fs.cc
+++ b/ircd/fs.cc
@@ -1089,6 +1089,7 @@ ircd::fs::_read_asio(const fd &fd,
 		}
 	};
 
+	assert(ret <= bytes(iov));
 	assert(ret || ec == eof);
 	if(unlikely(ec && ec != eof))
 		throw_system_error(ec);