diff --git a/tools/test/stress2/tools/flip.c b/tools/test/stress2/tools/flip.c
index a298aebf6d43..e1f12e97a79c 100644
--- a/tools/test/stress2/tools/flip.c
+++ b/tools/test/stress2/tools/flip.c
@@ -1,133 +1,145 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2020 Peter Holm <pho@FreeBSD.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 /*
  * Flip one or more bits in a file.
  */
 
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #include <err.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 extern char *optarg;
 extern int optind;
 
 static long
 random_long(long mi, long ma)
 {
         return (arc4random()  % (ma - mi + 1) + mi);
 }
 
 static void
 flip(void *ap, size_t len)
 {
 	unsigned char *cp;
 	int byte;
 	unsigned char bit, buf, mask, old __unused;
 
 	cp = (unsigned char *)ap;
 	byte = random_long(0, len - 1);
 	bit = random_long(0,7);
 	mask = ~(1 << bit);
 	buf = cp[byte];
 	old = cp[byte];
 	buf = (buf & mask) | (~buf & ~mask);
 	cp[byte] = buf;
 #if defined(DEBUG)
 	printf("Change %2x to %2x at %d by flipping bit %d\n",
 	    old, buf, byte, bit);
 #endif
 }
 
+static void
+trash(char *c)
+{
+	if (arc4random() % 2 == 1)
+		*c = 0;
+	else
+		arc4random_buf(c, sizeof(c));
+}
+
 int
 main(int argc, char *argv[])
 {
 	struct stat st;
 	off_t pos;
 	size_t size;
 	int fd, i, times;
 	char c;
 
 	times = 1;
 	size = 0;
 	while ((c = getopt(argc, argv, "n:s:")) != -1) {
 		switch (c) {
 			case 'n':
 				times = atoi(optarg);
 				break;
 			case 's':
 				size = atol(optarg);
 				break;
 			case '?':
 			default:
 				fprintf(stderr,
 				    "Usage: %s [ -n <num> <file>]\n",
 				    argv[0]);
 				exit(1);
 		}
 	}
 	argc -= optind;
 	argv += optind;
 
 	if (argc != 1) {
 		fprintf(stderr, "Missing file name\n");
 		exit(1);
 	}
 
 	if ((fd = open(argv[0], O_RDWR)) == -1)
 		err(1, "open(%s)", argv[0]);
 
 	if (size == 0) {
 		if (fstat(fd, &st) == -1)
 			err(1, "stat %s", argv[0]);
 		if ((st.st_mode & S_IFREG) == 0)
 			errx(1, "%s must be a regular file\n", argv[0]);
 		size = st.st_size;
 	}
 
 	for (i = 0; i < times; i++) {
 		pos = arc4random() % size;
 		if (lseek(fd, pos, SEEK_SET) == -1)
 			err(1, "lseek()");
 		if (read(fd, &c, 1) != 1)
 			err(1, "read()");
-		flip(&c, 1);
+		if (arc4random() % 100 < 80)
+			flip(&c, 1);
+		else
+			trash(&c);
 		if (lseek(fd, pos, SEEK_SET) == -1)
 			err(1, "lseek()");
 		if (write(fd, &c, 1) != 1)
 			err(1, "write()");
 	}
 
 	return (0);
 }