// https://syzkaller.appspot.com/bug?id=efba70aa85a9f8096a8e4fa956c02e209806a7a1
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <pthread.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>
#include <util.h>

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  dp = opendir(dir);
  if (dp == NULL)
    exit(1);
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename))
      exit(1);
  }
  closedir(dp);
  if (rmdir(dir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

#define __syscall syscall

static uintptr_t syz_open_pts(void)
{
  int master, slave;
  if (openpty(&master, &slave, NULL, NULL, NULL) == -1)
    return -1;
  if (dup2(master, master + 100) != -1)
    close(master);
  return slave;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 8; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syz_open_pts();
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x20000080 = 0;
    *(uint32_t*)0x20000084 = 0;
    *(uint32_t*)0x20000088 = 0x90d2;
    *(uint32_t*)0x2000008c = 0;
    memcpy((void*)0x20000090,
           "\xd7\x30\xc1\xe7\xbb\x6f\xc6\xe2\x3c\x5b\x00\x00\x00\x00\x00\x00"
           "\x00\xe7\x4d\xe4",
           20);
    *(uint32_t*)0x200000a4 = 0;
    *(uint32_t*)0x200000a8 = 0;
    syscall(SYS_ioctl, r[0], 0x802c7416, 0x20000080);
    break;
  case 2:
    memcpy(
        (void*)0x20000200,
        "\x3e\x2a\x79\x13\xe4\xba\xd2\x1c\x71\x4f\x4d\xd3\x6a\x27\xe5\xe2\x7b"
        "\x21\x6d\x67\x35\x51\xc0\xc0\x1b\x3d\xfa\xf9\x17\x39\xee\x6c\xfd\x0f"
        "\x85\x00\x00\x00\xe5\x52\xaa\xee\xfe\xaf\xf0\xf2\xc8\x5e\x28\x31\xc6"
        "\x1a\xd4\x49\x01\x1f\x78\x00\x00\x00\x00\x00\x00\x01\x3c\x1f\xe9\x00"
        "\x20\x00\x00\x00\x00\x00\x00\x01\xff\x10\x34\x34\x82\x0a\xbc\x4b\xca"
        "\xbb\xa3\x44\x40\x02\x00\x7e\x14\x29\x5f\xba\xab\xbb\xaf\xe2\x14\xde"
        "\xa7\x9d\x99\x17\xdd\x1d\x95\xe8\xf6\xb9\xd3\x60\xee\x90\x6e\x5a\xfd"
        "\xc2\x7b\x8c\x98\x31\x35\x1d\x74\x12\x2a\xb9\xbd\x51\x0e\xb0\x0b\xb2"
        "\xc4\xc7\xa1\x8e\xf0\x02\x35\x68\x5c\x20\x01\xfc\x17\x00\x00\xde\xee"
        "\x2f\x87\x3c\x1e\x71\x1d\x5b\x65\xd2\x71\x2d\x93\xae\x73\x1f\xfe\xe5"
        "\xa6\x27\x00\x00\x71\x06\xbd\x31\xb4\x60\x5f\x1d\x00\x08\xfd\xbc\x15"
        "\xa6\x02\x9b\x9a\x5b\x80\x6d\x3e\xa7\xb6\xa7\xd9\x6d\xb3\xa6\x7d\x37"
        "\x36\xb2\x69\x79\x0d\x96\xf5\xb1\x01\xbc\x48\xce\xbd\x1f\x74\x80\x40"
        "\x91\xd0\xcf\x27\xda\x72\x1a\xb3\xfe\x68\xbf\xdd\xd2\x7d\x0a\x11\x0f"
        "\xeb\xf1\xb4\xd9\x97\x76\x52\xce\x45\xf4\x87\x17\x74\xc7\x80\x9d\x2b"
        "\x4b\x3c\xe5\x9d\xf4\x98\x97\x87\x2d\x4b\x02\x92\x85\x1d\x36\xee\xae"
        "\x7e\xbf\xb4\xc9\xd7\xb3\x1f\x67\x8d\xf4\x4f\xf0\xff",
        285);
    syscall(SYS_write, r[0], 0x20000200, 0x11d);
    break;
  case 3:
    res = syz_open_pts();
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    syscall(SYS_fsync, r[0]);
    break;
  case 5:
    syscall(SYS_mmap, 0x20fff000, 0x1000, 6, 0x11, r[1], 0, 0);
    break;
  case 6:
    syscall(SYS_dup, r[1]);
    break;
  case 7:
    syz_open_pts();
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0, 0);
  use_temporary_dir();
  loop();
  return 0;
}