add -D to generate a process in uninterruptible sleep

2 files changed, 20 insertions, 2 deletions

diff --git a/fail.1 b/fail.1
index c5af510..d63ea57 100644
--- a/fail.1
+++ b/fail.1
@@ -6,7 +6,7 @@
 .Nd crash in various possible ways
 .Sh SYNOPSIS
 .Nm
-.Op Fl 123Oacdikrst
+.Op Fl 123DOacdikrst
 .Sh DESCRIPTION
 .Nm
 crashes in various possible ways to
@@ -27,6 +27,13 @@ Return with exit status -1.
 Return with exit status 2.
 .It Fl 3
 Return with exit status 111.
+.It Fl D
+Create a process that is in uninterruptible sleep (state D) and
+print its pid.
+(This uses
+.Xr vfork 2
+and
+.Xr pause 2 . )
 .It Fl O
 Allocate memory in an infinite loop,
 to trigger an out of memory situation.
diff --git a/fail.c b/fail.c
index f586ba8..6e986ee 100644
--- a/fail.c
+++ b/fail.c
@@ -10,6 +10,7 @@
 
 #include <fcntl.h>
 #include <signal.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 
@@ -34,6 +35,15 @@ dlcrash()
 		*nullp = 1337;
 }
 
+void
+uninterruptible()
+{
+	printf("pid %d is now in state D\n", getpid());
+	vfork();
+	pause();
+	exit(1);
+}
+
 // can lockup your machine
 void
 oom()
@@ -122,11 +132,12 @@ main(int argc, char *argv[])
 {
 	int c;
 
-	while ((c = getopt(argc, argv, "123Oacdikrst")) != -1) {
+	while ((c = getopt(argc, argv, "123DOacdikrst")) != -1) {
 		switch (c) {
 		case '1': exit(-1); break;
 		case '2': exit(2); break;
 		case '3': exit(111); break;
+		case 'D': uninterruptible(); break;
 		case 'O': oom(); break;
 		case 'a': abortme(); break;
 		case 'c': violate_seccomp(); break;