// https://syzkaller.appspot.com/bug?id=c9f395033a8f613015c2b458fa2fe97430852ae8
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>

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 thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i;
  for (i = 0; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

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

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 loop(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 3; 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;
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    memcpy((void*)0x20000000, "/dev/pf\000\000", 9);
    res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000000ul, 0ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x200000c0 = 0;
    *(uint64_t*)0x200000c8 = 0;
    syscall(SYS_ioctl, r[0], 0xc0504417ul, 0x200000c0ul);
    break;
  case 2:
    memcpy(
        (void*)0x20000100,
        "\x53\x00\x28\xb4\x87\x3e\x2a\x23\x83\x3a\x64\x83\x69\x62\xc7\x5a\x94"
        "\x5c\x75\xbb\xa2\xbf\xc4\x9e\x19\x68\xf0\x69\x2a\x5d\xf4\x0d\x17\xd4"
        "\x70\x56\x00\xbf\x10\x9b\xfe\x12\x6d\x0f\x8f\x13\xd9\x07\x65\x6b\x33"
        "\x85\xd7\xd7\x19\xb5\x8a\xdf\x70\x15\x1e\x10\xd5\x84\x2e\x0b\xc9\xc1"
        "\x79\x7a\x19\x9e\x2e\x5c\x71\x6f\x55\x15\x12\x00\xd6\xa8\x9d\x72\x48"
        "\x74\xfd\xc5\xfa\xb8\x53\x57\x37\x35\xf5\xbc\xef\x16\x88\xc7\x57\x3d"
        "\xca\x7a\x3d\xa3\x5a\xcb\xd8\x1a\xf3\x34\x92\xff\x5a\xec\xb6\xe7\x1d"
        "\xd5\xb2\x91\x88\x45\x64\x8a\xc3\x62\x74\x51\x19\xcf\x9b\x86\xd9\x08"
        "\xdd\x4b\x9a\xbc\xa7\xf9\x17\x8b\x7a\xa3\x04\x8a\x93\x8f\x57\x06\x38"
        "\x7d\x0b\x8b\x08\xad\x52\xd0\xd3\x2f\xef\xbb\x49\xdc\x72\x8b\x04\x7c"
        "\x96\x32\x38\x66\xaf\x74\x41\x06\xfa\xe8\x94\xcf\x46\x6d\x57\xb8\x84"
        "\x9b\xa2\xee\x36\x08\x11\x30\x4f\x41\xcd\xf2\x44",
        199);
    syscall(SYS_sendto, -1, 0x20000100ul, 0xc7ul, 1ul, 0ul, 0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  loop();
  return 0;
}