Index: squashfs-tools-4.6.1/squashfs-tools/mksquashfs.c
===================================================================
--- squashfs-tools-4.6.1.orig/squashfs-tools/mksquashfs.c
+++ squashfs-tools-4.6.1/squashfs-tools/mksquashfs.c
@@ -5276,6 +5276,15 @@ static void initialise_threads(int readq
 		}
 #endif
 	}
+	/* Every frag_thrd will:
+	 * * occupy a slot in the process table (_SC_CHILD_MAX), and will
+	 * * allocate SQUASHFS_FILE_MAX_SIZE (currently 1MiB), which is
+	 *   accounted towards the per-process datasize limit, and will
+	 * * open 1 file descriptor (_SC_OPEN_MAX).
+	 * Before we hit any of those limits on big irons, limit
+	 * ourselves to an impressive but sane arbitrary maximum.
+	 */
+	if (processors > 64) processors = 64;
 
 	if(multiply_overflow(processors, 3) ||
 			multiply_overflow(processors * 3, sizeof(pthread_t)))