Index: sys/sys/ktrace.h
===================================================================
--- sys/sys/ktrace.h
+++ sys/sys/ktrace.h
@@ -309,6 +309,8 @@
 	ktrstruct_error("stat", (s), sizeof(struct stat), error)
 #define ktrcpuset(s, l) \
 	ktrstruct("cpuset_t", (s), l)
+#define ktrsigset(s, l) \
+	ktrstruct("sigset_t", (s), l)
 extern u_int ktr_geniosize;
 #ifdef	KTRACE
 extern int ktr_filesize_limit_signal;
Index: usr.bin/kdump/kdump.c
===================================================================
--- usr.bin/kdump/kdump.c
+++ usr.bin/kdump/kdump.c
@@ -60,6 +60,7 @@
 #include <sys/ktrace.h>
 #include <sys/mman.h>
 #include <sys/ioctl.h>
+#include <sys/signalvar.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/sysent.h>
@@ -123,6 +124,7 @@
 void ktrkevent(struct kevent *);
 void ktrstructarray(struct ktr_struct_array *, size_t);
 void ktrbitset(char *, struct bitset *, size_t);
+void ktrsigset(char *, sigset_t *, size_t);
 void usage(void);
 
 #define	TIMESTAMP_NONE		0x0
@@ -1995,6 +1997,29 @@
 		printf(" ]\n");
 }
 
+void
+ktrsigset(char *name, sigset_t *set, size_t setlen)
+{
+	unsigned long i, c;
+
+	if (SIGISEMPTY(*set)) {
+		printf("%s [ empty ]\n", name);
+		return;
+	}
+	printf("%s [ ", name);
+	c = 0;
+	for (i = 0; i < setlen * CHAR_BIT; i++) {
+		if (!BIT_ISSET(setlen, i, set))
+			continue;
+		if (c == 0)
+			printf("%s", sysdecode_signal(i+1));
+		else
+			printf(", %s", sysdecode_signal(i+1));
+		c++;
+	}
+	printf(" ]\n");
+}
+
 void
 ktrstruct(char *buf, size_t buflen)
 {
@@ -2006,6 +2031,7 @@
 	struct stat sb;
 	struct sockaddr_storage ss;
 	struct bitset *set;
+	sigset_t *sigset;
 
 	for (name = buf, namelen = 0;
 	     namelen < buflen && name[namelen] != '\0';
@@ -2054,6 +2080,15 @@
 		memcpy(set, data, datalen);
 		ktrbitset(name, set, datalen);
 		free(set);
+	} else if (strcmp(name, "sigset_t") == 0) {
+		if (datalen < 1)
+			goto invalid;
+		sigset = malloc(datalen);
+		if (sigset == NULL)
+			errx(1, "%s", strerror(ENOMEM));
+		memcpy(sigset, data, datalen);
+		ktrsigset(name, sigset, datalen);
+		free(sigset);
 	} else {
 		printf("unknown structure\n");
 	}