// https://syzkaller.appspot.com/bug?id=af3a0728c8cbf6903ec2b0836441287cced00c1c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

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;
      }
    }
  }
}

uint64_t r[9] = {0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0xffffffffffffffff,
                 0x0,
                 0x0,
                 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_io_setup, 0, 0x20000180);
    break;
  case 1:
    syscall(__NR_inotify_init1, 0x80800);
    break;
  case 2:
    *(uint32_t*)0x20000380 = 0x1c;
    syscall(__NR_accept4, -1, 0x20000340, 0x20000380, 0x80000);
    break;
  case 3:
    memcpy((void*)0x200003c0, "cgroup.controllers", 19);
    res = syscall(__NR_openat, -1, 0x200003c0, 0, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 4:
    memcpy((void*)0x20000400, "cgroup.procs", 13);
    syscall(__NR_openat, 0xffffff9c, 0x20000400, 2, 0);
    break;
  case 5:
    res = syscall(__NR_socket, 1, 5, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 6:
    res = syscall(__NR_dup2, r[1], r[1]);
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    memcpy((void*)0x20000040, "tls", 4);
    syscall(__NR_setsockopt, r[2], 6, 0x1f, 0x20000040, 4);
    break;
  case 8:
    syscall(__NR_dup3, 0xffffff9c, -1, 0x80000);
    break;
  case 9:
    res = syscall(__NR_socket, 2, 0xc682b15d8cd2eba0, 4);
    if (res != -1)
      r[3] = res;
    break;
  case 10:
    *(uint32_t*)0x20000480 = 0x1c;
    syscall(__NR_accept, -1, 0x20000440, 0x20000480);
    break;
  case 11:
    memcpy((void*)0x200004c0, "./file0/file0", 14);
    res = syscall(__NR_open, 0x200004c0, 1, 1);
    if (res != -1)
      r[4] = res;
    break;
  case 12:
    res = syscall(__NR_dup3, r[4], r[3], 0x80000);
    if (res != -1)
      r[5] = res;
    break;
  case 13:
    *(uint64_t*)0x200000c0 = 3;
    syscall(__NR_fcntl, r[5], 0x40c, 0x200000c0);
    break;
  case 14:
    *(uint32_t*)0x200002c0 = 0xc7;
    syscall(__NR_getsockopt, r[5], 0x10e, 1, 0x200001c0, 0x200002c0);
    break;
  case 15:
    res = syscall(__NR_semget, 0x798e2633, 3, 0x108);
    if (res != -1)
      r[6] = res;
    break;
  case 16:
    syscall(__NR_semctl, r[6], 6, 3, 0x20000680);
    break;
  case 17:
    *(uint32_t*)0x20000c40 = 0x80;
    res = syscall(__NR_accept4, r[0], 0x20000bc0, 0x20000c40, 0x800);
    if (res != -1)
      r[7] = *(uint32_t*)0x20000bc4;
    break;
  case 18:
    memcpy((void*)0x20000c80,
           "\x73\x79\x7a\x5f\x74\x75\x6e\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           16);
    *(uint32_t*)0x20000c90 = r[7];
    syscall(__NR_ioctl, r[0], 0x8933, 0x20000c80);
    break;
  case 19:
    memcpy((void*)0x20001240, "/dev/ptmx", 10);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20001240, 0x8080, 0);
    if (res != -1)
      r[8] = res;
    break;
  case 20:
    *(uint64_t*)0x20001340 = 0x20001280;
    *(uint64_t*)0x20001348 = 0x26;
    *(uint64_t*)0x20001350 = 0x200012c0;
    *(uint64_t*)0x20001358 = 0x61;
    syscall(__NR_readv, r[8], 0x20001340, 2);
    break;
  }
}

void loop()
{
  execute(21);
  collide = 1;
  execute(21);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}