xref: /freebsd/tools/test/stress2/misc/syzkaller11.sh (revision 81ad6265) 
1#!/bin/sh
2
3# panic: mtx_lock() of spin mutex (null) @ ../../../netinet/tcp_output.c:350
4# cpuid = 1
5# time = 1587276361
6# KDB: stack backtrace:
7# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01388956f0
8# vpanic() at vpanic+0x182/frame 0xfffffe0138895740
9# panic() at panic+0x43/frame 0xfffffe01388957a0
10# __mtx_lock_flags() at __mtx_lock_flags+0x13c/frame 0xfffffe01388957f0
11# tcp_output() at tcp_output+0x34e/frame 0xfffffe0138895980
12# tcp_usr_connect() at tcp_usr_connect+0x123/frame 0xfffffe01388959e0
13# soconnectat() at soconnectat+0xd0/frame 0xfffffe0138895a30
14# kern_connectat() at kern_connectat+0xe2/frame 0xfffffe0138895a90
15# sys_connect() at sys_connect+0x75/frame 0xfffffe0138895ad0
16# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe0138895bf0
17# fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0138895bf0
18
19# Reproduced on r358885
20
21[ `uname -p` = "i386" ] && exit 0
22
23. ../default.cfg
24cat > /tmp/syzkaller11.c <<EOF
25// https://syzkaller.appspot.com/bug?id=f81a41d30e772445b13de6dcf07fc1afaf122a61
26// autogenerated by syzkaller (https://github.com/google/syzkaller)
27
28#define _GNU_SOURCE
29
30#include <sys/types.h>
31
32#include <errno.h>
33#include <pthread.h>
34#include <pwd.h>
35#include <signal.h>
36#include <stdarg.h>
37#include <stdbool.h>
38#include <stdint.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sys/endian.h>
43#include <sys/syscall.h>
44#include <sys/wait.h>
45#include <time.h>
46#include <unistd.h>
47
48static void kill_and_wait(int pid, int* status)
49{
50  kill(pid, SIGKILL);
51  while (waitpid(-1, status, 0) != pid) {
52  }
53}
54
55static void sleep_ms(uint64_t ms)
56{
57  usleep(ms * 1000);
58}
59
60static uint64_t current_time_ms(void)
61{
62  struct timespec ts;
63  if (clock_gettime(CLOCK_MONOTONIC, &ts))
64    exit(1);
65  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
66}
67
68static void thread_start(void* (*fn)(void*), void* arg)
69{
70  pthread_t th;
71  pthread_attr_t attr;
72  pthread_attr_init(&attr);
73  pthread_attr_setstacksize(&attr, 128 << 10);
74  int i;
75  for (i = 0; i < 100; i++) {
76    if (pthread_create(&th, &attr, fn, arg) == 0) {
77      pthread_attr_destroy(&attr);
78      return;
79    }
80    if (errno == EAGAIN) {
81      usleep(50);
82      continue;
83    }
84    break;
85  }
86  exit(1);
87}
88
89typedef struct {
90  pthread_mutex_t mu;
91  pthread_cond_t cv;
92  int state;
93} event_t;
94
95static void event_init(event_t* ev)
96{
97  if (pthread_mutex_init(&ev->mu, 0))
98    exit(1);
99  if (pthread_cond_init(&ev->cv, 0))
100    exit(1);
101  ev->state = 0;
102}
103
104static void event_reset(event_t* ev)
105{
106  ev->state = 0;
107}
108
109static void event_set(event_t* ev)
110{
111  pthread_mutex_lock(&ev->mu);
112  if (ev->state)
113    exit(1);
114  ev->state = 1;
115  pthread_mutex_unlock(&ev->mu);
116  pthread_cond_broadcast(&ev->cv);
117}
118
119static void event_wait(event_t* ev)
120{
121  pthread_mutex_lock(&ev->mu);
122  while (!ev->state)
123    pthread_cond_wait(&ev->cv, &ev->mu);
124  pthread_mutex_unlock(&ev->mu);
125}
126
127static int event_isset(event_t* ev)
128{
129  pthread_mutex_lock(&ev->mu);
130  int res = ev->state;
131  pthread_mutex_unlock(&ev->mu);
132  return res;
133}
134
135static int event_timedwait(event_t* ev, uint64_t timeout)
136{
137  uint64_t start = current_time_ms();
138  uint64_t now = start;
139  pthread_mutex_lock(&ev->mu);
140  for (;;) {
141    if (ev->state)
142      break;
143    uint64_t remain = timeout - (now - start);
144    struct timespec ts;
145    ts.tv_sec = remain / 1000;
146    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
147    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
148    now = current_time_ms();
149    if (now - start > timeout)
150      break;
151  }
152  int res = ev->state;
153  pthread_mutex_unlock(&ev->mu);
154  return res;
155}
156
157struct thread_t {
158  int created, call;
159  event_t ready, done;
160};
161
162static struct thread_t threads[16];
163static void execute_call(int call);
164static int running;
165
166static void* thr(void* arg)
167{
168  struct thread_t* th = (struct thread_t*)arg;
169  for (;;) {
170    event_wait(&th->ready);
171    event_reset(&th->ready);
172    execute_call(th->call);
173    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
174    event_set(&th->done);
175  }
176  return 0;
177}
178
179static void execute_one(void)
180{
181  int i, call, thread;
182  int collide = 0;
183again:
184  for (call = 0; call < 4; call++) {
185    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
186         thread++) {
187      struct thread_t* th = &threads[thread];
188      if (!th->created) {
189        th->created = 1;
190        event_init(&th->ready);
191        event_init(&th->done);
192        event_set(&th->done);
193        thread_start(thr, th);
194      }
195      if (!event_isset(&th->done))
196        continue;
197      event_reset(&th->done);
198      th->call = call;
199      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
200      event_set(&th->ready);
201      if (collide && (call % 2) == 0)
202        break;
203      event_timedwait(&th->done, 45);
204      break;
205    }
206  }
207  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
208    sleep_ms(1);
209  if (!collide) {
210    collide = 1;
211    goto again;
212  }
213}
214
215static void execute_one(void);
216
217#define WAIT_FLAGS 0
218
219static void loop(void)
220{
221  int iter;
222  for (iter = 0;; iter++) {
223    int pid = fork();
224    if (pid < 0)
225      exit(1);
226    if (pid == 0) {
227      execute_one();
228      exit(0);
229    }
230    int status = 0;
231    uint64_t start = current_time_ms();
232    for (;;) {
233      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
234        break;
235      sleep_ms(1);
236      if (current_time_ms() - start < 5 * 1000)
237        continue;
238      kill_and_wait(pid, &status);
239      break;
240    }
241  }
242}
243
244uint64_t r[1] = {0xffffffffffffffff};
245
246void execute_call(int call)
247{
248  intptr_t res;
249  switch (call) {
250  case 0:
251    res = syscall(SYS_socket, 2ul, 1ul, 0);
252    if (res != -1)
253      r[0] = res;
254    break;
255  case 1:
256    memcpy((void*)0x20000040,
257           "bbr\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
258           "\000\000\000\000\000\000\000\000\000\000\000\000\000",
259           32);
260    *(uint32_t*)0x20000060 = 0;
261    syscall(SYS_setsockopt, r[0], 6, 0x2000, 0x20000040ul, 0x24ul);
262    break;
263  case 2:
264    *(uint8_t*)0x20000180 = 0x10;
265    *(uint8_t*)0x20000181 = 2;
266    *(uint16_t*)0x20000182 = htobe16(0x4e22);
267    *(uint32_t*)0x20000184 = htobe32(0xfff);
268    *(uint8_t*)0x20000188 = 0;
269    *(uint8_t*)0x20000189 = 0;
270    *(uint8_t*)0x2000018a = 0;
271    *(uint8_t*)0x2000018b = 0;
272    *(uint8_t*)0x2000018c = 0;
273    *(uint8_t*)0x2000018d = 0;
274    *(uint8_t*)0x2000018e = 0;
275    *(uint8_t*)0x2000018f = 0;
276    syscall(SYS_connect, r[0], 0x20000180ul, 0x10ul);
277    break;
278  case 3:
279    syscall(SYS_listen, r[0], 0);
280    break;
281  }
282}
283int main(void)
284{
285  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
286  loop();
287  return 0;
288}
289EOF
290mycc -o /tmp/syzkaller11 -Wall -Wextra -O2 /tmp/syzkaller11.c -lpthread ||
291    exit 1
292
293(cd /tmp; ./syzkaller11) &
294sleep 60
295pkill -9 syzkaller11
296wait
297
298rm -f /tmp/syzkaller11 /tmp/syzkaller11.c /tmp/syzkaller11.core
299exit 0
300