// https://syzkaller.appspot.com/bug?id=6225e7b911f6977538f7bd519ba9811d9fc2cb94
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>

#include <stdint.h>
#include <string.h>

static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
            (uint8_t)a1, (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]);
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

long r[2];
void execute_call(int call)
{
  switch (call) {
  case 0:
    r[0] = syscall(__NR_socket, 0x2, 0xf, 0x81);
    break;
  case 1:
    syscall(__NR_mmap, 0x20000000, 0x1000, 0x3, 0x32, 0xffffffff, 0x0);
    break;
  case 2:
    *(uint32_t*)0x20000ffc = 0x4;
    syscall(__NR_getsockopt, r[0], 0x84, 0x14, 0x2006f000, 0x20000ffc);
    break;
  case 3:
    syscall(__NR_mmap, 0x20001000, 0x1000, 0x3, 0x32, 0xffffffff, 0x0);
    break;
  case 4:
    *(uint64_t*)0x20001f88 = 0x8;
    *(uint16_t*)0x20001f90 = 0x2;
    *(uint16_t*)0x20001f92 = htobe16(0x4e22);
    *(uint32_t*)0x20001f94 = htobe32(0x3ff);
    *(uint8_t*)0x20001f98 = 0x0;
    *(uint8_t*)0x20001f99 = 0x0;
    *(uint8_t*)0x20001f9a = 0x0;
    *(uint8_t*)0x20001f9b = 0x0;
    *(uint8_t*)0x20001f9c = 0x0;
    *(uint8_t*)0x20001f9d = 0x0;
    *(uint8_t*)0x20001f9e = 0x0;
    *(uint8_t*)0x20001f9f = 0x0;
    *(uint16_t*)0x20001fa0 = 0x2;
    *(uint16_t*)0x20001fa2 = htobe16(0x4e23);
    *(uint32_t*)0x20001fa4 = htobe32(0x0);
    *(uint8_t*)0x20001fa8 = 0x0;
    *(uint8_t*)0x20001fa9 = 0x0;
    *(uint8_t*)0x20001faa = 0x0;
    *(uint8_t*)0x20001fab = 0x0;
    *(uint8_t*)0x20001fac = 0x0;
    *(uint8_t*)0x20001fad = 0x0;
    *(uint8_t*)0x20001fae = 0x0;
    *(uint8_t*)0x20001faf = 0x0;
    *(uint16_t*)0x20001fb0 = 0x2;
    *(uint16_t*)0x20001fb2 = htobe16(0x4e22);
    *(uint32_t*)0x20001fb4 = htobe32(0xffffffff);
    *(uint8_t*)0x20001fb8 = 0x0;
    *(uint8_t*)0x20001fb9 = 0x0;
    *(uint8_t*)0x20001fba = 0x0;
    *(uint8_t*)0x20001fbb = 0x0;
    *(uint8_t*)0x20001fbc = 0x0;
    *(uint8_t*)0x20001fbd = 0x0;
    *(uint8_t*)0x20001fbe = 0x0;
    *(uint8_t*)0x20001fbf = 0x0;
    *(uint16_t*)0x20001fc0 = 0x0;
    *(uint16_t*)0x20001fc2 = 0x147a;
    *(uint64_t*)0x20001fc8 = 0x1ff;
    *(uint64_t*)0x20001fd0 = 0x7c;
    *(uint16_t*)0x20001fd8 = 0x101;
    *(uint64_t*)0x20001fe0 = 0x20000ff0;
    *(uint64_t*)0x20001fe8 = 0x9;
    *(uint64_t*)0x20001ff0 = 0x12;
    *(uint16_t*)0x20001ff8 = 0x7ff;
    memcpy((void*)0x20000ff0, "\x8f\x3e\x84\x5a\xa2\x79\x7e\x97\x7e\x73"
                              "\x36\x3a\x41\x46\x8e\x7b",
           16);
    syscall(__NR_ioctl, r[0], 0x890d, 0x20001f88);
    break;
  case 5:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 0x3, 0x32, 0xffffffff,
            0x0);
    break;
  case 6:
    memcpy((void*)0x208be000, "/dev/usbmon#", 13);
    r[1] = syz_open_dev(0x208be000, 0x0, 0x0);
    break;
  case 7:
    syscall(__NR_ioctl, r[1], 0x5405, 0x20909000);
    break;
  case 8:
    memcpy((void*)0x205e4ff3, "/dev/net/tun", 13);
    syz_open_dev(0x205e4ff3, 0x0, 0x400);
    break;
  case 9:
    syscall(__NR_mmap, 0x20ac6000, 0x4000, 0x1000004, 0x8011, r[1],
            0x0);
    break;
  case 10:
    syscall(__NR_ioctl, r[1], 0x9204, 0xf0b1);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(11);
  collide = 1;
  execute(11);
}

int main()
{
  loop();
  return 0;
}