1 // SPDX-License-Identifier: GPL-2.0
2
3 #define _GNU_SOURCE
4 #include <sched.h>
5 #include <test_progs.h>
6 #include <pthread.h>
7 #include <network_helpers.h>
8
9 #include "timer_lockup.skel.h"
10
11 static long cpu;
12 static int *timer1_err;
13 static int *timer2_err;
14 static bool skip;
15
16 volatile int k = 0;
17
18 static void *timer_lockup_thread(void *arg)
19 {
20 LIBBPF_OPTS(bpf_test_run_opts, opts,
21 .data_in = &pkt_v4,
22 .data_size_in = sizeof(pkt_v4),
23 .repeat = 1000,
24 );
25 int i, prog_fd = *(int *)arg;
26 cpu_set_t cpuset;
27
28 CPU_ZERO(&cpuset);
29 CPU_SET(__sync_fetch_and_add(&cpu, 1), &cpuset);
30 ASSERT_OK(pthread_setaffinity_np(pthread_self(), sizeof(cpuset),
31 &cpuset),
32 "cpu affinity");
33
34 for (i = 0; !READ_ONCE(*timer1_err) && !READ_ONCE(*timer2_err); i++) {
35 bpf_prog_test_run_opts(prog_fd, &opts);
36 /* Skip the test if we can't reproduce the race in a reasonable
37 * amount of time.
38 */
39 if (i > 50) {
40 WRITE_ONCE(skip, true);
41 break;
42 }
43 }
44
45 return NULL;
46 }
47
48 void test_timer_lockup(void)
49 {
50 int timer1_prog, timer2_prog;
51 struct timer_lockup *skel;
52 pthread_t thrds[2];
53 void *ret;
54
55 skel = timer_lockup__open_and_load();
56 if (!ASSERT_OK_PTR(skel, "timer_lockup__open_and_load"))
57 return;
58
59 timer1_prog = bpf_program__fd(skel->progs.timer1_prog);
60 timer2_prog = bpf_program__fd(skel->progs.timer2_prog);
61
62 timer1_err = &skel->bss->timer1_err;
63 timer2_err = &skel->bss->timer2_err;
64
65 if (!ASSERT_OK(pthread_create(&thrds[0], NULL, timer_lockup_thread,
66 &timer1_prog),
67 "pthread_create thread1"))
68 goto out;
69 if (!ASSERT_OK(pthread_create(&thrds[1], NULL, timer_lockup_thread,
70 &timer2_prog),
71 "pthread_create thread2")) {
72 pthread_exit(&thrds[0]);
73 goto out;
74 }
75
76 pthread_join(thrds[1], &ret);
77 pthread_join(thrds[0], &ret);
78
79 if (skip) {
80 test__skip();
81 goto out;
82 }
83
84 if (*timer1_err != -EDEADLK && *timer1_err != 0)
85 ASSERT_FAIL("timer1_err bad value");
86 if (*timer2_err != -EDEADLK && *timer2_err != 0)
87 ASSERT_FAIL("timer2_err bad value");
88 out:
89 timer_lockup__destroy(skel);
90 return;
91 }
92
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