// https://syzkaller.appspot.com/bug?id=8ed8ce0f03f401bb985a341005f18d5ba0c2ce82
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#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/endian.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;
}

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;
  for (call = 0; call < 6; 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);
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

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

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(SYS_socket, 0x1c, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    res = syscall(SYS_fcntl, r[0], 3, -1);
    if (res != -1)
      r[1] = res;
    break;
  case 2:
    *(uint64_t*)0x200004c0 = 0x20000400;
    memcpy((void*)0x20000400, "\000", 1);
    *(uint64_t*)0x200004c8 = 0x20000440;
    memcpy((void*)0x20000440, "\000", 1);
    syscall(SYS_execve, 0, 0, 0x200004c0);
    break;
  case 3:
    syscall(SYS_writev, r[1], 0x20000280, 0x26);
    break;
  case 4:
    *(uint16_t*)0x20000100 = 0x1c;
    *(uint16_t*)0x20000102 = htobe16(0x4e21);
    *(uint32_t*)0x20000104 = 0x3e8d;
    *(uint8_t*)0x20000108 = 0xfe;
    *(uint8_t*)0x20000109 = 0x80;
    *(uint8_t*)0x2000010a = 0;
    *(uint8_t*)0x2000010b = 0;
    *(uint8_t*)0x2000010c = 0;
    *(uint8_t*)0x2000010d = 0;
    *(uint8_t*)0x2000010e = 0;
    *(uint8_t*)0x2000010f = 0;
    *(uint8_t*)0x20000110 = 0;
    *(uint8_t*)0x20000111 = 0;
    *(uint8_t*)0x20000112 = 0;
    *(uint8_t*)0x20000113 = 0;
    *(uint8_t*)0x20000114 = 0;
    *(uint8_t*)0x20000115 = 0;
    *(uint8_t*)0x20000116 = 0;
    *(uint8_t*)0x20000117 = 0xbb;
    *(uint32_t*)0x20000118 = 0;
    syscall(SYS_recvfrom, r[0], 0, 0, 0, 0x20000100, 0x1c);
    break;
  case 5:
    syscall(SYS_writev, r[1], 0x20000100, 0x100000000000005d);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000, 0x1000000, 3, 0x1012, -1, 0);
  loop();
  return 0;
}