// https://syzkaller.appspot.com/bug?id=38896a9da63b2195cd9b5611e05910c5f5cfe65b
// autogenerated by syzkaller (http://github.com/google/syzkaller)

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

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[7] = {0x0, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0,
                 0x0, 0x0};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_semget, 0, 4, 0x200);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    res = syscall(__NR_getuid);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    memcpy((void*)0x20000640, "./file0", 8);
    res = syscall(__NR_open, 0x20000640, 0x80, 0x20);
    if (res != -1)
      r[2] = res;
    break;
  case 3:
    syscall(__NR_ioctl, r[2], 0x5411, 0x20000680);
    break;
  case 4:
    res = syscall(__NR_fcntl, 0xffffff9c, 0x406, -1);
    if (res != -1)
      r[3] = res;
    break;
  case 5:
    *(uint32_t*)0x200006c0 = 0x8bd2;
    *(uint32_t*)0x200006c4 = 5;
    *(uint32_t*)0x200006c8 = 7;
    *(uint32_t*)0x200006cc = 4;
    syscall(__NR_setsockopt, r[3], 0x10e, 7, 0x200006c0, 0x10);
    break;
  case 6:
    res = syscall(__NR_getgid);
    if (res != -1)
      r[4] = res;
    break;
  case 7:
    *(uint32_t*)0x20000300 = 0xe8;
    res = syscall(__NR_getsockopt, -1, 0, 0x10, 0x20000400, 0x20000300);
    if (res != -1)
      r[5] = *(uint32_t*)0x20000434;
    break;
  case 8:
    *(uint32_t*)0x20000380 = 0xc;
    res = syscall(__NR_getsockopt, 0xffffff9c, 1, 0x11, 0x20000340, 0x20000380);
    if (res != -1)
      r[6] = *(uint32_t*)0x20000348;
    break;
  case 9:
    *(uint32_t*)0x20000500 = 0x280000;
    *(uint32_t*)0x20000504 = r[1];
    *(uint32_t*)0x20000508 = r[4];
    *(uint32_t*)0x2000050c = r[5];
    *(uint32_t*)0x20000510 = r[6];
    *(uint32_t*)0x20000514 = 0x60;
    *(uint16_t*)0x20000518 = 2;
    *(uint16_t*)0x2000051a = 0;
    *(uint64_t*)0x20000520 = 0;
    *(uint64_t*)0x20000528 = 0;
    *(uint64_t*)0x20000530 = 2;
    *(uint64_t*)0x20000538 = 5;
    *(uint64_t*)0x20000540 = 1;
    *(uint64_t*)0x20000548 = 0;
    *(uint64_t*)0x20000550 = 0;
    syscall(__NR_semctl, r[0], 0, 1, 0x20000500);
    break;
  case 10:
    syscall(__NR_semctl, r[0], 0, 0);
    break;
  }
}

void loop()
{
  execute(11);
  collide = 1;
  execute(11);
}

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