--- elfutils-0.179/libcpu/i386_disasm.c	2020-03-30 07:17:45.000000000 -0500
+++ elfutils-0.179/libcpu/i386_disasm.c	2020-04-17 03:48:44.199416141 -0500
@@ -712,6 +712,7 @@ i386_disasm (Ebl *ebl __attribute__((unu
 
 		case 'm':
 		  /* Mnemonic.  */
+		  str = mnebuf;
 
 		  if (unlikely (instrtab[cnt].mnemonic == MNE_INVALID))
 		    {