// 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 <stdint.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);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum, const uint8_t* data,
                             size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
uint64_t procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0xa, 2, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    memcpy((void*)0x200004c0,
           "\x66\x69\x6c\x74\x65\x72\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x0e\x00\x00\x00\x04\x00\x00\x00\xae\xcd\x75\x26\x6d\x05\xd8\x03"
           "\x00\x00\xff\xff\xff\xff\xf0\x00\x00\x00\xf0\x00\x00\x00\xf0\x00"
           "\x00\x00\xff\xff\xff\xff\xff\xff\xff\x87\xe7\x28\xff\x08\x03\x00"
           "\x00\x08\x03\x00\x00\x08\x03\x00\x00\xff\xff",
           91);
    *(uint64_t*)0x2000051b = 0x20000040;
    syscall(__NR_setsockopt, r[0], 0x29, 0x40, 0x200004c0, 3);
    break;
  case 2:
    memcpy((void*)0x203e4f72, "\xcd\x39\x0b\x08\x1b\xf2", 6);
    *(uint8_t*)0x203e4f78 = -1;
    *(uint8_t*)0x203e4f79 = -1;
    *(uint8_t*)0x203e4f7a = -1;
    *(uint8_t*)0x203e4f7b = -1;
    *(uint8_t*)0x203e4f7c = -1;
    *(uint8_t*)0x203e4f7d = -1;
    *(uint16_t*)0x203e4f7e = htobe16(0x86dd);
    STORE_BY_BITMASK(uint8_t, 0x203e4f80, 0, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x203e4f80, 6, 4, 4);
    memcpy((void*)0x203e4f81, "\x0f\x29\x02", 3);
    *(uint16_t*)0x203e4f84 = htobe16(8);
    *(uint8_t*)0x203e4f86 = 0x3a;
    *(uint8_t*)0x203e4f87 = 0;
    *(uint8_t*)0x203e4f88 = 0;
    *(uint8_t*)0x203e4f89 = 0;
    *(uint8_t*)0x203e4f8a = 0;
    *(uint8_t*)0x203e4f8b = 0;
    *(uint8_t*)0x203e4f8c = 0;
    *(uint8_t*)0x203e4f8d = 0;
    *(uint8_t*)0x203e4f8e = 0;
    *(uint8_t*)0x203e4f8f = 0;
    *(uint8_t*)0x203e4f90 = 0;
    *(uint8_t*)0x203e4f91 = 0;
    *(uint8_t*)0x203e4f92 = -1;
    *(uint8_t*)0x203e4f93 = -1;
    *(uint32_t*)0x203e4f94 = htobe32(0);
    *(uint8_t*)0x203e4f98 = 0xfe;
    *(uint8_t*)0x203e4f99 = 0x80;
    *(uint8_t*)0x203e4f9a = 0;
    *(uint8_t*)0x203e4f9b = 0;
    *(uint8_t*)0x203e4f9c = 0;
    *(uint8_t*)0x203e4f9d = 0;
    *(uint8_t*)0x203e4f9e = 0;
    *(uint8_t*)0x203e4f9f = 0;
    *(uint8_t*)0x203e4fa0 = 0;
    *(uint8_t*)0x203e4fa1 = 0;
    *(uint8_t*)0x203e4fa2 = 0;
    *(uint8_t*)0x203e4fa3 = 0;
    *(uint8_t*)0x203e4fa4 = 0;
    *(uint8_t*)0x203e4fa5 = 0;
    *(uint8_t*)0x203e4fa6 = 0;
    *(uint8_t*)0x203e4fa7 = 0;
    *(uint16_t*)0x203e4fa8 = htobe16(0x4e20);
    *(uint16_t*)0x203e4faa = htobe16(0x4e20);
    *(uint16_t*)0x203e4fac = htobe16(8);
    *(uint16_t*)0x203e4fae = 0;
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    csum_inet_update(&csum_1, (const uint8_t*)0x203e4f88, 16);
    csum_inet_update(&csum_1, (const uint8_t*)0x203e4f98, 16);
    uint32_t csum_1_chunk_2 = 0x8000000;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
    uint32_t csum_1_chunk_3 = 0x11000000;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
    csum_inet_update(&csum_1, (const uint8_t*)0x203e4fa8, 8);
    *(uint16_t*)0x203e4fae = csum_inet_digest(&csum_1);
    syz_emit_ethernet(0x3e, 0x203e4f72, 0);
    break;
  case 3:
    res = syscall(__NR_socket, 0xa, 2, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    res = syscall(__NR_socket, 0x10, 3, 6);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    *(uint16_t*)0x20c63ff4 = 0x10;
    *(uint16_t*)0x20c63ff6 = 0;
    *(uint32_t*)0x20c63ff8 = 0;
    *(uint32_t*)0x20c63ffc = 3;
    syscall(__NR_bind, r[2], 0x20c63ff4, 0xc);
    break;
  case 6:
    *(uint16_t*)0x2052f000 = 0xa;
    *(uint16_t*)0x2052f002 = htobe16(0x4e20);
    *(uint32_t*)0x2052f004 = 0;
    *(uint8_t*)0x2052f008 = -1;
    *(uint8_t*)0x2052f009 = 2;
    *(uint8_t*)0x2052f00a = 0;
    *(uint8_t*)0x2052f00b = 0;
    *(uint8_t*)0x2052f00c = 0;
    *(uint8_t*)0x2052f00d = 0;
    *(uint8_t*)0x2052f00e = 0;
    *(uint8_t*)0x2052f00f = 0;
    *(uint8_t*)0x2052f010 = 0;
    *(uint8_t*)0x2052f011 = 0;
    *(uint8_t*)0x2052f012 = 0;
    *(uint8_t*)0x2052f013 = 0;
    *(uint8_t*)0x2052f014 = 0;
    *(uint8_t*)0x2052f015 = 0;
    *(uint8_t*)0x2052f016 = 0;
    *(uint8_t*)0x2052f017 = 1;
    *(uint32_t*)0x2052f018 = 7;
    syscall(__NR_connect, r[1], 0x2052f000, 0x1c);
    break;
  case 7:
    *(uint32_t*)0x20c9af18 = htobe32(0);
    *(uint8_t*)0x20c9af28 = 0xfe;
    *(uint8_t*)0x20c9af29 = 0x80;
    *(uint8_t*)0x20c9af2a = 0;
    *(uint8_t*)0x20c9af2b = 0;
    *(uint8_t*)0x20c9af2c = 0;
    *(uint8_t*)0x20c9af2d = 0;
    *(uint8_t*)0x20c9af2e = 0;
    *(uint8_t*)0x20c9af2f = 0;
    *(uint8_t*)0x20c9af30 = 0;
    *(uint8_t*)0x20c9af31 = 0;
    *(uint8_t*)0x20c9af32 = 0;
    *(uint8_t*)0x20c9af33 = 0;
    *(uint8_t*)0x20c9af34 = 0;
    *(uint8_t*)0x20c9af35 = 0;
    *(uint8_t*)0x20c9af36 = 0;
    *(uint8_t*)0x20c9af37 = 0;
    *(uint16_t*)0x20c9af38 = htobe16(0x4e20);
    *(uint16_t*)0x20c9af3a = htobe16(0);
    *(uint16_t*)0x20c9af3c = htobe16(0x4e20);
    *(uint16_t*)0x20c9af3e = htobe16(0);
    *(uint16_t*)0x20c9af40 = 0xa;
    *(uint8_t*)0x20c9af42 = 0;
    *(uint8_t*)0x20c9af43 = 0;
    *(uint8_t*)0x20c9af44 = 0;
    *(uint32_t*)0x20c9af48 = 0;
    *(uint32_t*)0x20c9af4c = 0;
    *(uint64_t*)0x20c9af50 = 0;
    *(uint64_t*)0x20c9af58 = 0;
    *(uint64_t*)0x20c9af60 = 0;
    *(uint64_t*)0x20c9af68 = 0;
    *(uint64_t*)0x20c9af70 = 0;
    *(uint64_t*)0x20c9af78 = 0;
    *(uint64_t*)0x20c9af80 = 0;
    *(uint64_t*)0x20c9af88 = 0;
    *(uint64_t*)0x20c9af90 = 0;
    *(uint64_t*)0x20c9af98 = 0;
    *(uint64_t*)0x20c9afa0 = 0;
    *(uint64_t*)0x20c9afa8 = 0;
    *(uint32_t*)0x20c9afb0 = 0;
    *(uint32_t*)0x20c9afb4 = 0;
    *(uint8_t*)0x20c9afb8 = 1;
    *(uint8_t*)0x20c9afb9 = 0;
    *(uint8_t*)0x20c9afba = 0;
    *(uint8_t*)0x20c9afbb = 0;
    *(uint32_t*)0x20c9afc0 = htobe32(0xe0000002);
    *(uint32_t*)0x20c9afd0 = htobe32(0);
    *(uint8_t*)0x20c9afd4 = 0x3c;
    *(uint16_t*)0x20c9afd8 = 0;
    *(uint8_t*)0x20c9afdc = 0;
    *(uint8_t*)0x20c9afdd = 0;
    *(uint8_t*)0x20c9afde = 0;
    *(uint8_t*)0x20c9afdf = 0;
    *(uint8_t*)0x20c9afe0 = 0;
    *(uint8_t*)0x20c9afe1 = 0;
    *(uint8_t*)0x20c9afe2 = 0;
    *(uint8_t*)0x20c9afe3 = 0;
    *(uint8_t*)0x20c9afe4 = 0;
    *(uint8_t*)0x20c9afe5 = 0;
    *(uint8_t*)0x20c9afe6 = -1;
    *(uint8_t*)0x20c9afe7 = -1;
    *(uint8_t*)0x20c9afe8 = 0xac;
    *(uint8_t*)0x20c9afe9 = 0x14;
    *(uint8_t*)0x20c9afea = -1;
    *(uint8_t*)0x20c9afeb = 0xbb;
    *(uint32_t*)0x20c9afec = 0;
    *(uint8_t*)0x20c9aff0 = 0;
    *(uint8_t*)0x20c9aff1 = 0;
    *(uint8_t*)0x20c9aff2 = 0xfd;
    *(uint32_t*)0x20c9aff4 = 0;
    *(uint32_t*)0x20c9aff8 = 0;
    *(uint32_t*)0x20c9affc = 0;
    syscall(__NR_setsockopt, r[1], 0x29, 0x23, 0x20c9af18, 0xe8);
    break;
  case 8:
    *(uint64_t*)0x200024c0 = 0;
    *(uint32_t*)0x200024c8 = 0;
    *(uint64_t*)0x200024d0 = 0x20002400;
    *(uint64_t*)0x200024d8 = 0;
    *(uint64_t*)0x200024e0 = 0;
    *(uint64_t*)0x200024e8 = 0;
    *(uint32_t*)0x200024f0 = 0;
    syscall(__NR_sendmsg, r[1], 0x200024c0, 0);
    break;
  }
}

void test()
{
  execute(9);
  collide = 1;
  execute(9);
}

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;
}