// https://syzkaller.appspot.com/bug?id=286166aa4744abfe4a5d2b5f6eb4796575004992
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.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);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  int state;
} event_t;

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

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

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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 < 4; 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)
{
  long res;
  switch (call) {
  case 0:
    memcpy((void*)0x20000000, "/dev/full\x00", 10);
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0x115000, 0);
    break;
  case 1:
    res = syscall(__NR_socket, 2, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    memcpy((void*)0x20000bc0,
           "\x66\x69\x6c\x74\x65\x72\x00\x00\x00\x00\x00\x00\x00\x00\x00\x15"
           "\xc1\x1f\x61\xfc\x98\x1f\x3a\xc0\xc4\xe3\xe7\x5a\x35\x00\x00\x00"
           "\x00\x00\x00\x00\x16\x84\xb2\xca\xd9\x5e\x89\xea\x00\x00\x00\x00"
           "\x00\x00\xd9\xa5\x00\x00\x07\x00\x00\x00\x04\x00\x00\x00\x58\x04"
           "\x00\x00\x00\x00\x00\x00\x50\x02\x00\x00\x50\x02\x00\x00\x70\x03"
           "\x00\x00\x70\x03\x00\x00\x70\x03\x00\x00\x23\x00\x00\x00\x07\x26"
           "\x49\xdd\x68\x88\x3a\x0c\x67\x1b\x24\xb2\xb2\x32\x1c\xec\x58\x3e"
           "\xb7\xe1\xab\x48\xab\x76\x49\xef\x26\xaf\xfb\x7f\x09\x8f\x5f\xf4"
           "\x98\x84\x16\xac\x37\x0b\xff\x87\x86\xf5\x1b\x74\x89\x45\x93\x3e"
           "\xb0\x64\x2f\xe9\x8c\x0c\x00\x00\x00\x00\x00\x00\x49\xf1\x75\xcc"
           "\x30\x00\xf4\x98\xf0\xf7\xef\xec\x78\x9f\x35\x1b\x33\x3c\x96\xc2"
           "\x45\x44\x44\x06\x3e\x87\xf2\x47\xf1\xfa\x76\x33\x6b\xbf\x69",
           191);
    *(uint64_t*)0x20000c7f = 0;
    syscall(__NR_setsockopt, r[0], 0, 0x60, 0x20000bc0, 3);
    break;
  case 3:
    memcpy((void*)0x200002c0,
           "\x14\xc7\x30\xd2\x6e\xbb\x05\xae\x98\x88\xa4\x26\xfa\x6a\x95\x9e"
           "\x80\x6a\xe6\x2a\x8a\x3f\xf0\x70\x04\xf5\x00\x67\x86\xd2\x76\x0f"
           "\x96\x9d\xce\xbe\xbd\xc2\xb0\x12\x3b\x47\x66\x37\xf9\xb4\x4a\x0c"
           "\x97\x06\xf8\xf7\xf4\xdd\x79\x6f\x16\x97\x03\x8d\xde\x6c\x0d\xd5"
           "\x27\xe6\xea\x73\xe0\x22\x95\x53\x39\x3e\xdd\xaa\x07\x66\x3e\xba"
           "\xa5\x1a\x9d\x8a\x55\xa7\xf2\xbc\xad\x24\xb9\x89\x30\x1e\x7b\x01"
           "\xcb\xfe\x16\xec\x1d\xbf\x52\xb3\x9d\x7d\x80\x7f\xf6\x66\x30\x30"
           "\xa7\xc0\x7d\x46\x83\x11\xd9\x56",
           120);
    syscall(__NR_keyctl, 2, 0, 0x200002c0, 0x78);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}