+++ ./cmds/info.c	2019-08-26 14:53:01.793449309 +0300
@@ -1146,7 +1146,7 @@
 
 	ret = open_info_file(opts, &handle);
 	if (ret < 0) {
-		pr_warn("cannot open record data: %s: %m\n", opts->dirname);
+		pr_warn("cannot open record data: %s: %s\n", opts->dirname, strerror(errno));
 		return -1;
 	}
 
+++ ./cmds/report.c	2019-08-26 14:57:29.911809302 +0300
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <inttypes.h>
 #include <assert.h>
+#include <errno.h>
 
 #include "uftrace.h"
 #include "utils/utils.h"
@@ -523,7 +524,7 @@
 	report_calc_avg(&base_tree);
 
 	if (open_data_file(&dummy_opts, &data.handle) < 0) {
-		pr_warn("cannot open record data: %s: %m\n", opts->diff);
+		pr_warn("cannot open record data: %s: %s\n", opts->diff, strerror(errno));
 		goto out;
 	}
 
@@ -609,7 +610,7 @@
 
 	ret = open_data_file(opts, &handle);
 	if (ret < 0) {
-		pr_warn("cannot open record data: %s: %m\n", opts->dirname);
+		pr_warn("cannot open record data: %s: %s\n", opts->dirname, strerror(errno));
 		return -1;
 	}
 
+++ ./cmds/dump.c	2019-08-26 14:59:44.802869609 +0300
@@ -5,6 +5,7 @@
 #include <time.h>
 #include <assert.h>
 #include <sys/stat.h>
+#include <errno.h>
 
 #include "uftrace.h"
 #include "version.h"
@@ -1582,7 +1583,7 @@
 
 	ret = open_data_file(opts, &handle);
 	if (ret < 0) {
-		pr_warn("cannot open record data: %s: %m\n", opts->dirname);
+		pr_warn("cannot open record data: %s: %s\n", opts->dirname, strerror(errno));
 		return -1;
 	}
 
+++ ./cmds/replay.c	2019-08-26 15:01:30.621223877 +0300
@@ -4,6 +4,7 @@
 #include <inttypes.h>
 #include <stdio_ext.h>
 #include <assert.h>
+#include <errno.h>
 
 #include "uftrace.h"
 #include "utils/utils.h"
@@ -1111,7 +1112,7 @@
 
 	ret = open_data_file(opts, &handle);
 	if (ret < 0) {
-		pr_warn("cannot open record data: %s: %m\n", opts->dirname);
+		pr_warn("cannot open record data: %s: %s\n", opts->dirname, strerror(errno));
 		return -1;
 	}