1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
static const stress_help_t help[] = {
{ NULL, "sigabrt N", "start N workers generating SIGABRT signals" },
{ NULL, "sigabrt-ops N", "stop after N bogo SIGABRT operations" },
{ NULL, NULL, NULL }
};
typedef struct {
volatile bool handler_enabled; /* True if using a SIGABRT handler */
volatile bool signalled; /* True if handler handled SIGABRT */
volatile double count;
volatile double t_start;
volatile double latency;
} stress_sigabrt_info_t;
static stress_sigabrt_info_t *sigabrt_info;
static void MLOCKED_TEXT stress_sigabrt_handler(int num)
{
(void)num;
if (sigabrt_info) { /* Should always be not null */
double latency = stress_time_now() - sigabrt_info->t_start;
sigabrt_info->signalled = true;
if (latency > 0.0) {
sigabrt_info->latency += latency;
sigabrt_info->count += 1.0;
}
}
}
/*
* stress_sigabrt
* stress by generating segmentation faults by
* writing to a read only page
*/
static int stress_sigabrt(stress_args_t *args)
{
double rate;
int rc = EXIT_SUCCESS;
if (stress_sighandler(args->name, SIGABRT, stress_sigabrt_handler, NULL) < 0)
return EXIT_NO_RESOURCE;
sigabrt_info = (stress_sigabrt_info_t *)mmap(NULL, sizeof(*sigabrt_info),
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS,
-1, 0);
if (sigabrt_info == MAP_FAILED) {
pr_inf_skip("%s: failed to mmap %zu byte sigabort information%s, "
"errno=%d (%s), skipping stressor\n",
args->name, sizeof(*sigabrt_info),
stress_get_memfree_str(), errno, strerror(errno));
return EXIT_NO_RESOURCE;
}
stress_set_vma_anon_name((void *)sigabrt_info, sizeof(*sigabrt_info), "state");
sigabrt_info->count = 0.0;
stress_set_proc_state(args->name, STRESS_STATE_SYNC_WAIT);
stress_sync_start_wait(args);
stress_set_proc_state(args->name, STRESS_STATE_RUN);
do {
pid_t pid;
(void)stress_mwc32();
sigabrt_info->signalled = false;
sigabrt_info->handler_enabled = stress_mwc1();
again:
pid = fork();
if (pid < 0) {
if (stress_redo_fork(args, errno))
goto again;
if (UNLIKELY(!stress_continue(args)))
goto finish;
pr_fail("%s: fork failed, errno=%d (%s)\n",
args->name, errno, strerror(errno));
return EXIT_FAILURE;
} else if (pid == 0) {
/* Randomly select death by abort or SIGABRT */
if (sigabrt_info->handler_enabled) {
VOID_RET(int, stress_sighandler(args->name, SIGABRT, stress_sigabrt_handler, NULL));
/*
* Aborting with a handler will call the handler, the handler will
* then be disabled and a second SIGABRT will occur causing the
* abort.
*/
sigabrt_info->t_start = stress_time_now();
abort();
/* Should never get here */
} else {
(void)stress_sighandler_default(SIGABRT);
/* Raising SIGABRT without an handler will abort */
sigabrt_info->t_start = stress_time_now();
shim_raise(SIGABRT);
}
_exit(EXIT_FAILURE);
} else {
pid_t ret;
int status;
rewait:
ret = shim_waitpid(pid, &status, 0);
if (ret < 0) {
if (errno == EINTR) {
goto rewait;
}
pr_fail("%s: waitpid() on PID %" PRIdMAX " failed, %d (%s)\n",
args->name, (intmax_t)pid, errno, strerror(errno));
rc = EXIT_FAILURE;
} else {
if (WIFSIGNALED(status) &&
(WTERMSIG(status) == SIGABRT)) {
if (sigabrt_info->handler_enabled) {
if (sigabrt_info->signalled == false) {
pr_fail("%s SIGABRT signal handler did not get called\n",
args->name);
rc = EXIT_FAILURE;
}
} else {
if (sigabrt_info->signalled == true) {
pr_fail("%s SIGABRT signal handler was unexpectedly called\n",
args->name);
rc = EXIT_FAILURE;
}
}
stress_bogo_inc(args);
} else if (WIFEXITED(status)) {
pr_fail("%s: child did not abort as expected\n",
args->name);
rc = EXIT_FAILURE;
}
}
}
} while ((rc == EXIT_SUCCESS) && stress_continue(args));
finish:
stress_set_proc_state(args->name, STRESS_STATE_DEINIT);
rate = (sigabrt_info->count > 0.0) ? sigabrt_info->latency / sigabrt_info->count : 0.0;
stress_metrics_set(args, 0, "nanosec SIGABRT latency",
rate * STRESS_DBL_NANOSECOND, STRESS_METRIC_HARMONIC_MEAN);
(void)munmap((void *)sigabrt_info, sizeof(*sigabrt_info));
return rc;
}
const stressor_info_t stress_sigabrt_info = {
.stressor = stress_sigabrt,
.classifier = CLASS_SIGNAL | CLASS_OS,
.verify = VERIFY_ALWAYS,
.help = help
};
|
