// https://syzkaller.appspot.com/bug?id=a7ab7d83299ae5ec94df094d8834dcfed6aa0ccf
// 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 < 5; 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 = 0;
  switch (call) {
  case 0:
    *(uint32_t*)0x20000040 = 1;
    *(uint32_t*)0x20000044 = 0x36;
    syscall(SYS_sysctl, 0x20000040ul, 2ul, 0ul, 0ul, 0x20000180ul, 4ul);
    break;
  case 1:
    *(uint32_t*)0x20000180 = 0xc;
    syscall(SYS_getsockopt, -1, 0xffff, 0x1022, 0x20000000ul, 0x20000180ul);
    break;
  case 2:
    memcpy((void*)0x20000200, "/dev/pf\000", 8);
    res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000200ul, 2ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    *(uint32_t*)0x20000240 = 0;
    syscall(SYS_ioctl, r[0], 0xcd604404ul, 0x20000240ul);
    break;
  case 4:
    *(uint32_t*)0x200000c0 = 1;
    *(uint32_t*)0x200000c4 = 0x4d;
    memcpy(
        (void*)0x20000300,
        "\xb1\x1b\x11\x67\x54\x44\x5c\xda\x0e\x56\x70\x4f\x8d\xd9\x5a\xaa\x4e"
        "\x57\x48\xf5\x6a\x89\x5c\x36\x0c\x49\x2d\x8e\x35\xb8\x4f\x9f\x1a\x44"
        "\xce\x79\x1b\xa4\x38\x7b\x7a\x2c\x60\x0c\xd8\x94\xcd\x05\x57\x1e\x2a"
        "\x3d\xd1\xed\x29\xe2\x65\xce\x80\xa9\x32\x1d\xf1\x53\xea\xa3\xbe\x30"
        "\xbc\xe9\x50\x6e\x22\x97\xfe\xf0\x63\x8b\x54\xc9\xe8\x1f\xe6\xe1\x1d"
        "\xc0\x02\x98\x63\x7e\xc9\xec\x20\xfe\xad\x2b\x12\xc8\x61\xb2\x6f\xa1"
        "\x58\xf7\x00\x3a\x6f\x62\xdf\x1d\x86\x5f\x0e\x54\x6c\x01\x5b\xec\x6c"
        "\x4c\xb2\x6e\xa1\x88\x0a\x41\x0d\x6c\xc5\x09\xce\x45\xbc\xb3\x06\x2d"
        "\x89\x0d\x48\x56\x4b\x94\x8e\x0e\x96\xcf\xaf\xec\xe4\x31\x6f\xbe\x77"
        "\x7b\x75\xa7\xea\x6b\x7d\x6b\xb3\x79\x8b\xdc\xb1\x66",
        166);
    *(uint64_t*)0x20000500 = 0xa6;
    memcpy((void*)0x20000000,
           "\x02\x00\x00\x00\x6e\x0f\x18\x7e\x4d\x80\x64\xe1\x1d\xfd\xac\x43"
           "\x46\xa9\xb6\x6d\xfb\xf7\x01\x2e\x77\xbc\x32\xdf\xce\xf6\x91\xea"
           "\xa3\xed\xfd\x47\xcb\x97\xf2\x22\x4e\x91\x0b\x01\x19\x5e\xce\x69"
           "\xc4\x5f\x26\x56\x7a\xa1\xb9\x19\xd2\x5a\xfc\x8f\x78\x44\xae\xcb"
           "\x14\x86\x3b\x0c\xc8\x4b\x17\x1e\xe8\xa4\x4b\x6f\x0a\xfe\x75\xd4"
           "\x02\xbf\xb1\x4a\x6c\xed\xa0\xe5\xd2\xc8\x5f\x9c\xf3\xa3\x44\x59"
           "\xcc\xb3\xab\x90\x69\x5b\xe2\x16\x87\x1d\xf4\x9c\x6f\x97\xac\xfb"
           "\xe3\xdf\x96\x47\xe7\x10\x56\x98\xb8\x4b\xb2\x73",
           124);
    syscall(SYS_sysctl, 0x200000c0ul, 2ul, 0x20000300ul, 0x20000500ul,
            0x20000000ul, 4ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  loop();
  return 0;
}