diff -ub -r alsa-utils-1.0.27.org/alsactl/lock.c alsa-utils-1.0.27/alsactl/lock.c
--- alsa-utils-1.0.27.org/alsactl/lock.c	2013-04-11 15:43:06.000000000 +0400
+++ alsa-utils-1.0.27/alsactl/lock.c	2013-05-03 09:49:45.000000000 +0400
@@ -35,7 +35,7 @@
 	int fd = -1, err = 0;
 	struct flock lck;
 	struct stat st;
-	char lcktxt[11];
+	char lcktxt[20];
 	char *nfile;
 
 	if (!do_lock)
@@ -53,6 +53,8 @@
 	lck.l_len = 11;
 	lck.l_pid = 0;
 	if (lock) {
+		// NOTE `long` type on amd64, being printed, could take up to 18 decimal digits
+		// (according output of std::numeric_limits<long>::digits10)
 		sprintf(lcktxt, "%10li\n", (long)getpid());
 	} else {
 		sprintf(lcktxt, "%10s\n", "");