// https://syzkaller.appspot.com/bug?id=d38ed0177151ca71af235c613ab4897461cf9ff3
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;

  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    fail("tun: snprintf failed");
  if ((size_t)rv >= size)
    fail("tun: string '%s...' doesn't fit into buffer", str);
}

static void snprintf_check(char* str, size_t size, const char* format, ...)
{
  va_list args;

  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}

#define COMMAND_MAX_LEN 128
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

static void execute_command(bool panic, const char* format, ...)
{
  va_list args;
  char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN];
  int rv;

  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  rv = system(command);
  if (panic && rv != 0)
    fail("tun: command \"%s\" failed with code %d", &command[0], rv);

  va_end(args);
}

static int tunfd = -1;
static int tun_frags_enabled;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define TUN_IFACE "syz_tun"

#define LOCAL_MAC "aa:aa:aa:aa:aa:aa"
#define REMOTE_MAC "aa:aa:aa:aa:aa:bb"

#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"

#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

static void initialize_tun(void)
{
  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1) {
    printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
    printf("otherwise fuzzing or reproducing might not work as intended\n");
    return;
  }
  const int kTunFd = 252;
  if (dup2(tunfd, kTunFd) < 0)
    fail("dup2(tunfd, kTunFd) failed");
  close(tunfd);
  tunfd = kTunFd;

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
      fail("tun: ioctl(TUNSETIFF) failed");
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNGETIFF) failed");
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;

  execute_command(1, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE);

  execute_command(1, "sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  TUN_IFACE);

  execute_command(1, "ip link set dev %s address %s", TUN_IFACE, LOCAL_MAC);
  execute_command(1, "ip addr add %s/24 dev %s", LOCAL_IPV4, TUN_IFACE);
  execute_command(1, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV6, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip link set dev %s up", TUN_IFACE);
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "veth"};
  const char* devnames[] = {"lo",       "sit0",    "bridge0", "vcan0",
                            "tunl0",    "gre0",    "gretap0", "ip_vti0",
                            "ip6_vti0", "ip6tnl0", "ip6gre0", "ip6gretap0",
                            "erspan0",  "bond0",   "veth0",   "veth1"};

  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add dev veth1 type veth");
  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

#define MAX_FRAGS 4
struct vnet_fragmentation {
  uint32_t full;
  uint32_t count;
  uint32_t frags[MAX_FRAGS];
};

static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (tunfd < 0)
    return (uintptr_t)-1;

  uint32_t length = a0;
  char* data = (char*)a1;

  struct vnet_fragmentation* frags = (struct vnet_fragmentation*)a2;
  struct iovec vecs[MAX_FRAGS + 1];
  uint32_t nfrags = 0;
  if (!tun_frags_enabled || frags == NULL) {
    vecs[nfrags].iov_base = data;
    vecs[nfrags].iov_len = length;
    nfrags++;
  } else {
    bool full = true;
    uint32_t i, count = 0;
    full = frags->full;
    count = frags->count;
    if (count > MAX_FRAGS)
      count = MAX_FRAGS;
    for (i = 0; i < count && length != 0; i++) {
      uint32_t size = 0;
      size = frags->frags[i];
      if (size > length)
        size = length;
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = size;
      nfrags++;
      data += size;
      length -= size;
    }
    if (length != 0 && (full || nfrags == 0)) {
      vecs[nfrags].iov_base = data;
      vecs[nfrags].iov_len = length;
      nfrags++;
    }
  }
  return writev(tunfd, vecs, nfrags);
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

#define CLONE_NEWCGROUP 0x02000000

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(CLONE_NEWCGROUP)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid < 0)
    fail("sandbox fork failed");
  if (pid)
    return pid;

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_tun();
  initialize_netdevices();

  loop();
  doexit(1);
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

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

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};
uint64_t procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 2, 1, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x200003c0 = 1;
    syscall(__NR_setsockopt, r[0], 6, 0x20010000000013, 0x200003c0, 4);
    break;
  case 2:
    *(uint32_t*)0x20000d40 = 1;
    syscall(__NR_setsockopt, r[0], 6, 0x14, 0x20000d40, 4);
    break;
  case 3:
    *(uint16_t*)0x20303000 = 2;
    *(uint16_t*)0x20303002 = htobe16(0);
    *(uint32_t*)0x20303004 = htobe32(0x7f000001);
    *(uint8_t*)0x20303008 = 0;
    *(uint8_t*)0x20303009 = 0;
    *(uint8_t*)0x2030300a = 0;
    *(uint8_t*)0x2030300b = 0;
    *(uint8_t*)0x2030300c = 0;
    *(uint8_t*)0x2030300d = 0;
    *(uint8_t*)0x2030300e = 0;
    *(uint8_t*)0x2030300f = 0;
    syscall(__NR_sendto, r[0], 0x20001180, 0, 0x800000020000000, 0x20303000,
            0x10);
    break;
  case 4:
    memcpy((void*)0x20000300, "\xbf", 1);
    *(uint16_t*)0x20000380 = 2;
    *(uint16_t*)0x20000382 = htobe16(0);
    *(uint32_t*)0x20000384 = htobe32(0);
    *(uint8_t*)0x20000388 = 0;
    *(uint8_t*)0x20000389 = 0;
    *(uint8_t*)0x2000038a = 0;
    *(uint8_t*)0x2000038b = 0;
    *(uint8_t*)0x2000038c = 0;
    *(uint8_t*)0x2000038d = 0;
    *(uint8_t*)0x2000038e = 0;
    *(uint8_t*)0x2000038f = 0;
    syscall(__NR_sendto, r[0], 0x20000300, 1, 0, 0x20000380, 0x10);
    break;
  case 5:
    memcpy(
        (void*)0x2018f000,
        "\xff\xff\xff\xff\xff\xff\x00\x00\x14\x00\x00\x00\x08\x00\x45\x00\x04"
        "\x15\x00\x00\x00\x00\x00\x11\x90\x78\x00\x00\x00\x00\xe0\x00\x00\x01"
        "\x4e\x20\x4e\x21\x04\x01\x90\x78\x00\xd7\x05\x02\x00\xf5\x34\x75\xb4"
        "\x41\xd6\x32\xcd\xbb\xcb\x21\x13\x63\x80\x7a\xec\x73\xd3\x88\x37\x62"
        "\xa6\x1d\xc0\x2d\x34\x9b\xfa\x3a\xc9\x74\xb9\x87\xaa\x7f\xb9\x7e\xb3"
        "\x24\xd5\x94\xfb\xbb\x77\xba\xb7\x59\x41\x8a\xa8\xd4\x51\xd9\x21\xe8"
        "\xf5\xd2\xcf\x2b\x08\x29\x21\x11\x70\x11\x92\xe9\x7c\xac\x36\x6d\xd3"
        "\xeb\x2e\x0f\xb0\x39\xe5\x83\x14\xef\x47\x09\xc5\xf3\x55\x6d\xb6\xa1"
        "\xab\x6b\x4f\xb2\xbd\xd8\x3c\xdc\x26\xe8\x39\x5e\xc4\x98\x4e\xc3\xfa"
        "\xf7\x1a\x61\x1d\x15\x69\x54\x5d\x65\x4c\xde\xd9\x3b\xe8\x27\xa8\x51"
        "\x88\xb8\x03\xc1\x9c\x1b\x56\xaa\xb5\x22\x86\x2a\x71\x8b\x81\xe5\x12"
        "\xb4\x96\x90\x99\x4d\x34\x25\xe3\x3b\xd9\x3f\x0e\x74\x4c\x66\xa0\x83"
        "\xc1\xf9\xf1\xbd\x7b\xb8\xf9\xe1\x23\xc0\x8f\x3f\x04\x1e\xd3\xfd\xc0"
        "\x58\x13\x6c\xf0\x07\x1a\x47\xcc\x0e\x38\x72\x0a\x12\xe1\x1e\x84\x2a"
        "\x7b\x5b\x26\xdf\xf0\x7f\x57\x8f\xdb\x9a\x7b\x14\x66\x2a\x62\x5c\x1e"
        "\xe7\x6c\x41\xcc\xb2\xb1\xfc\x63\x76\xaa\x71\x8e\x10\x67\xb9\xe4\xaf"
        "\x51\x1e\xf5\xb3\x60\xdb\xfa\xd3\x26\x10\x8b\xb0\x33\xdb\x19\x3d\xab"
        "\x27\x97\x4e\xb8\xc4\x62\x73\x9e\xae\xe5\x1d\x87\xf3\x1c\x51\x6e\x7e"
        "\x39\x10\x73\x77\x0d\xa3\x20\x2e\x02\xc4\x1a\x72\x77\xc8\x47\xdf\x24"
        "\xbd\x5b\x0a\x7a\xb6\xe2\x52\xf3\xc8\xeb\xf0\x06\x88\xcc\x55\x31\x1d"
        "\x88\x7e\x8b\xfd\x95\xa7\xf4\xc6\xa1\x26\xaf\x3f\xe2\x67\x14\xdd\xb8"
        "\x69\xc6\x6d\x18\xf8\x70\x63\x1b\xbd\x49\x7e\x8a\x06\x88\x1b\x75\x4e"
        "\xcd\xcd\xd0\xdc\xff\xc5\x1c\xd5\x2a\x6b\x56\x0f\x8d\x64\xb6\x3a\x16"
        "\x74\x74\x5e\xdc\x5f\x53\xb1\x8a\x8f\xfc\xc5\xc2\xfb\xc4\xd2\xbb\xcc"
        "\x2f\xaf\x3c\x18\x9d\x9b\x36\xc0\x65\x5d\x13\x94\xf5\xc1\x27\xec\x86"
        "\xb8\xa7\x64\xa8\x7b\x54\x6c\x2b\x6a\xc3\x7d\x0a\x8e\xc3\xed\xd7\xcd"
        "\xa6\xf9\x30\x57\x07\x63\xdb\xdc\x06\x40\xd2\x19\x74\x9b\xd5\x7c\x7c"
        "\x89\xea\xad\xfd\xae\x41\xd6\x54\xa4\x6b\x17\xbe\x06\x9a\x32\xa5\xd9"
        "\x4d\x29\xb6\x12\xfb\xe6\x1b\x8b\xd1\x1a\x2d\x10\xba\x5d\x4a\xc7\x01"
        "\x4f\xc0\x46\x5c\x3f\x14\x45\x98\xbd\x1f\x91\x33\x43\xe7\x29\x37\x11"
        "\x04\x0e\xee\x0a\xe8\xdf\x1e\x49\xf0\x4e\xd1\x03\x7d\x4b\x74\x2a\xed"
        "\x0e\x93\x21\x16\x06\x0a\xaf\x6b\x98\x52\x38\xd2\xe1\x0f\xb5\xb1\x1d"
        "\x19\xd7\x80\x1b\xef\xed\x48\x33\x28\x7d\x96\xa8\x5a\x7c\xdd\x9e\x21"
        "\x1a\x67\x27\x60\x33\x56\x55\x57\x6f\xc0\xfa\x03\x36\x62\x1c\x2b\x2b"
        "\x10\x18\xef\x71\xbb\x50\x77\xc6\x7e\xe5\xfa\x8d\x47\x9d\x67\x76\x01"
        "\x33\x63\xe9\x8b\x1f\x12\x13\x71\x2b\xe7\xe4\x75\x49\xb6\x03\x54\x59"
        "\x00\x8c\x50\x9f\x0f\x98\x31\x30\xa4\x51\x53\x13\x81\xee\x3c\x1a\xb9"
        "\xe1\xcb\xb8\xe5\x58\xb5\x6c\xa1\xa7\x09\x39\x38\x9a\xdd\xc5\xf9\x63"
        "\x2b\x37\xff\x3f\x63\x4a\xbb\x50\x4b\xb0\xbe\x0a\x51\x64\x96\x83\xf6"
        "\xe2\x95\x88\xc1\x5c\xda\x40\x25\x5e\x17\x33\x28\x68\x18\x84\xff\xef"
        "\x67\x29\xe9\x05\x8c\x56\x23\xe1\x40\x1f\xdc\xc7\xb8\xcb\x56\x23\xa8"
        "\xfd\x72\x5f\xbe\xea\x05\xfc\x41\x7c\x44\xe4\x65\x00\x61\x92\x18\xdf"
        "\xf7\xc7\x0a\xa0\x68\x99\x4c\x58\x88\x3c\xad\xa5\x05\xa2\xaa\x85\xb6"
        "\x62\x0d\xfe\x9c\x45\xb7\x07\xc9\xaa\x12\x22\xb8\x69\x72\xea\xe5\x64"
        "\xb2\x8a\x05\xdd\xfa\x35\x45\xdf\x23\x1f\xde\x27\x07\xd4\xbf\x67\xdc"
        "\x6b\xa4\x1d\xab\xa9\x1d\xee\x80\x81\xe5\xc7\xe2\xbc\xfb\xeb\xeb\xd4"
        "\x2d\x5a\xb8\xa3\x2d\x6e\x09\x8f\xd5\x72\x33\xe3\xb8\x13\xdc\x0d\x77"
        "\x21\x34\x77\x5d\xef\x45\x18\x23\xb7\xfe\xf2\xbc\x93\xda\x01\x72\x2c"
        "\xd6\x13\xb9\xa3\xdb\x7e\x2d\x4c\x51\xfb\x7b\x56\x00\x6e\xe9\xce\xa5"
        "\x3b\x62\x34\x35\x99\xa5\x61\x67\x38\x8d\x45\x24\x7f\x92\x89\xfb\x1c"
        "\xab\x67\xa7\xcb\x0c\x36\x65\xdd\xf1\xe1\x41\x18\x75\xb4\xde\x34\x28"
        "\xb3\x2f\xc6\x60\x36\x91\xa0\x23\xd8\xe4\xcb\x93\xc6\x67\xac\xb7\xb5"
        "\x35\xfb\x5f\x77\xaf\x9a\x49\x64\x0c\xbe\x8f\xfe\x3a\x19\x3c\xf4\xdf"
        "\x1b\x55\x6a\x67\xcb\x75\x3c\x60\xbd\xf9\x78\xb8\x71\xaa\x51\x3c\x07"
        "\x07\x4c\x66\x02\x03\x7e\xbc\x32\x19\x92\x90\xe3\xc7\xac\x6f\x10\x3a"
        "\xd9\x35\x89\x51\xad\x4d\xe0\xc8\xf1\xb3\x49\x51\xb0\xe6\xa4\x82\x95"
        "\x97\x5c\xf0\x8b\x2c\x3c\x95\x06\x48\x55\xfc\x95\x31\x7e\x38\x6f\x1c"
        "\x18\x60\x8d\x1d\x08\x69\x90\x03\xc9\x98\xb9\x33\x32\xcd\x31\x6f\x17"
        "\xa5\x13\x9d\x35\x0c\xbf\xa9\xda\xbc\x3f\x77\xc4\x19\x7a\x01\x86\xe5"
        "\x09\x13\x97\x8e\x98\x0a\x7a\x02\x8e\x7c\xcd\xee\xe7\x18\xaf\x02\x82"
        "\x00\xe9\x4a\x6b\x3a\x0e\xc9\x3b\xa1\x4b\x0c\x64\xdf\xaf\x39\x67\xe2"
        "\x30\xd8\xcf\x87\x6f\x26\x28\x7d\x43\x6e\xbc\x95\x88\xb5\x2b\x43\xf2"
        "\x38\x08\x36\xbf\xe3",
        1059);
    syz_emit_ethernet(1, 0x2018f000, 0);
    break;
  }
}

void test()
{
  execute(6);
  collide = 1;
  execute(6);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        int pid = do_sandbox_none();
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}