// https://syzkaller.appspot.com/bug?id=f9c94b10e49ae0433f27c4838c7e0f0a321606f5
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/net.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

struct ipt_getinfo {
  char name[32];
  unsigned int valid_hooks;
  unsigned int hook_entry[5];
  unsigned int underflow[5];
  unsigned int num_entries;
  unsigned int size;
};

struct ipt_get_entries {
  char name[32];
  unsigned int size;
  void* entrytable[1024 / sizeof(void*)];
};

struct xt_counters {
  uint64_t pcnt, bcnt;
};

struct ipt_replace {
  char name[32];
  unsigned int valid_hooks;
  unsigned int num_entries;
  unsigned int size;
  unsigned int hook_entry[5];
  unsigned int underflow[5];
  unsigned int num_counters;
  struct xt_counters* counters;
  char entrytable[1024];
};

struct ipt_table_desc {
  const char* name;
  struct ipt_getinfo info;
  struct ipt_get_entries entries;
  struct ipt_replace replace;
  struct xt_counters counters[10];
};

static struct ipt_table_desc ipv4_tables[] = {
    {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
    {.name = "raw"},    {.name = "security"},
};

#define IPT_BASE_CTL 64
#define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
#define IPT_SO_GET_INFO (IPT_BASE_CTL)
#define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)

static void checkpoint_net_namespace(void)
{
  socklen_t optlen;
  unsigned i;
  int fd;

  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1)
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) {
    struct ipt_table_desc* table = &ipv4_tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->entries.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &table->info, &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      fail("getsockopt(IPT_SO_GET_INFO)");
    }
    if (table->info.size > sizeof(table->entries.entrytable))
      fail("table size is too large: %u", table->info.size);
    if (table->info.num_entries >
        sizeof(table->counters) / sizeof(table->counters[0]))
      fail("too many counters: %u", table->info.num_entries);
    table->entries.size = table->info.size;
    optlen = sizeof(table->entries) - sizeof(table->entries.entrytable) +
             table->info.size;
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &table->entries, &optlen))
      fail("getsockopt(IPT_SO_GET_ENTRIES)");
    table->replace.valid_hooks = table->info.valid_hooks;
    table->replace.num_entries = table->info.num_entries;
    table->replace.counters = table->counters;
    table->replace.size = table->info.size;
    memcpy(table->replace.hook_entry, table->info.hook_entry,
           sizeof(table->replace.hook_entry));
    memcpy(table->replace.underflow, table->info.underflow,
           sizeof(table->replace.underflow));
    memcpy(table->replace.entrytable, table->entries.entrytable,
           table->info.size);
  }
  close(fd);
}

static void reset_net_namespace(void)
{
  struct ipt_get_entries entries;
  struct ipt_getinfo info;
  socklen_t optlen;
  unsigned i;
  int fd;

  memset(&info, 0, sizeof(info));
  memset(&entries, 0, sizeof(entries));
  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1)
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  for (i = 0; i < sizeof(ipv4_tables) / sizeof(ipv4_tables[0]); i++) {
    struct ipt_table_desc* table = &ipv4_tables[i];
    if (table->info.valid_hooks == 0)
      continue;
    strcpy(info.name, table->name);
    optlen = sizeof(info);
    if (getsockopt(fd, SOL_IP, IPT_SO_GET_INFO, &info, &optlen))
      fail("getsockopt(IPT_SO_GET_INFO)");
    if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
      if (getsockopt(fd, SOL_IP, IPT_SO_GET_ENTRIES, &entries, &optlen))
        fail("getsockopt(IPT_SO_GET_ENTRIES)");
      if (memcmp(&table->entries, &entries, optlen) == 0)
        continue;
    }
    table->replace.num_counters = info.num_entries;
    optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
             table->replace.size;
    if (setsockopt(fd, SOL_IP, IPT_SO_SET_REPLACE, &table->replace, optlen))
      fail("setsockopt(IPT_SO_SET_REPLACE)");
  }
  close(fd);
}

static void test();

void loop()
{
  int iter;
  checkpoint_net_namespace();
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("loop fork failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
    reset_net_namespace();
  }
}

long r[3];
void test()
{
  memset(r, -1, sizeof(r));
  syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
  r[0] = syscall(__NR_socket, 0xa, 0x80002, 0x88);
  NONFAILING(*(uint16_t*)0x208a8000 = 0xa);
  NONFAILING(*(uint16_t*)0x208a8002 = htobe16(0x4e23));
  NONFAILING(*(uint32_t*)0x208a8004 = 0);
  NONFAILING(*(uint8_t*)0x208a8008 = 0);
  NONFAILING(*(uint8_t*)0x208a8009 = 0);
  NONFAILING(*(uint8_t*)0x208a800a = 0);
  NONFAILING(*(uint8_t*)0x208a800b = 0);
  NONFAILING(*(uint8_t*)0x208a800c = 0);
  NONFAILING(*(uint8_t*)0x208a800d = 0);
  NONFAILING(*(uint8_t*)0x208a800e = 0);
  NONFAILING(*(uint8_t*)0x208a800f = 0);
  NONFAILING(*(uint8_t*)0x208a8010 = 0);
  NONFAILING(*(uint8_t*)0x208a8011 = 0);
  NONFAILING(*(uint8_t*)0x208a8012 = 0);
  NONFAILING(*(uint8_t*)0x208a8013 = 0);
  NONFAILING(*(uint8_t*)0x208a8014 = 0);
  NONFAILING(*(uint8_t*)0x208a8015 = 0);
  NONFAILING(*(uint8_t*)0x208a8016 = 0);
  NONFAILING(*(uint8_t*)0x208a8017 = 0);
  NONFAILING(*(uint32_t*)0x208a8018 = 0);
  syscall(__NR_bind, r[0], 0x208a8000, 0x1c);
  r[1] = syscall(__NR_socket, 0xa, 0x8000000000000802, 0);
  syscall(__NR_dup3, r[0], r[1], 0);
  NONFAILING(*(uint64_t*)0x20a29000 = 0x20685ff0);
  NONFAILING(*(uint32_t*)0x20a29008 = 0x10);
  NONFAILING(*(uint64_t*)0x20a29010 = 0x20fc5fc0);
  NONFAILING(*(uint64_t*)0x20a29018 = 0);
  NONFAILING(*(uint64_t*)0x20a29020 = 0x20000000);
  NONFAILING(*(uint64_t*)0x20a29028 = 0);
  NONFAILING(*(uint32_t*)0x20a29030 = 0);
  NONFAILING(*(uint16_t*)0x20685ff0 = 2);
  NONFAILING(*(uint16_t*)0x20685ff2 = htobe16(0x4e23));
  NONFAILING(*(uint32_t*)0x20685ff4 = htobe32(0));
  NONFAILING(*(uint8_t*)0x20685ff8 = 0);
  NONFAILING(*(uint8_t*)0x20685ff9 = 0);
  NONFAILING(*(uint8_t*)0x20685ffa = 0);
  NONFAILING(*(uint8_t*)0x20685ffb = 0);
  NONFAILING(*(uint8_t*)0x20685ffc = 0);
  NONFAILING(*(uint8_t*)0x20685ffd = 0);
  NONFAILING(*(uint8_t*)0x20685ffe = 0);
  NONFAILING(*(uint8_t*)0x20685fff = 0);
  syscall(__NR_sendmsg, r[1], 0x20a29000, 0x8000);
  NONFAILING(*(uint16_t*)0x200dcfe4 = 0xa);
  NONFAILING(*(uint16_t*)0x200dcfe6 = 0);
  NONFAILING(*(uint32_t*)0x200dcfe8 = 0);
  NONFAILING(*(uint8_t*)0x200dcfec = 0xfe);
  NONFAILING(*(uint8_t*)0x200dcfed = 0x80);
  NONFAILING(*(uint8_t*)0x200dcfee = 0);
  NONFAILING(*(uint8_t*)0x200dcfef = 0);
  NONFAILING(*(uint8_t*)0x200dcff0 = 0);
  NONFAILING(*(uint8_t*)0x200dcff1 = 0);
  NONFAILING(*(uint8_t*)0x200dcff2 = 0);
  NONFAILING(*(uint8_t*)0x200dcff3 = 0);
  NONFAILING(*(uint8_t*)0x200dcff4 = 0);
  NONFAILING(*(uint8_t*)0x200dcff5 = 0);
  NONFAILING(*(uint8_t*)0x200dcff6 = 0);
  NONFAILING(*(uint8_t*)0x200dcff7 = 0);
  NONFAILING(*(uint8_t*)0x200dcff8 = 0);
  NONFAILING(*(uint8_t*)0x200dcff9 = 0);
  NONFAILING(*(uint8_t*)0x200dcffa = 0);
  NONFAILING(*(uint8_t*)0x200dcffb = 0xbb);
  NONFAILING(*(uint32_t*)0x200dcffc = 0);
  syscall(__NR_sendto, r[1], 0x20ebcfa5, 0xfe21, 0, 0x200dcfe4, 0x76);
  NONFAILING(memcpy((void*)0x20005faa, "\xcd\x39\x97\xfb\x0f\x00", 6));
  NONFAILING(*(uint8_t*)0x20005fb0 = 0);
  NONFAILING(*(uint8_t*)0x20005fb1 = 0);
  NONFAILING(*(uint8_t*)0x20005fb2 = 0);
  NONFAILING(*(uint8_t*)0x20005fb3 = 0);
  NONFAILING(*(uint8_t*)0x20005fb4 = 0);
  NONFAILING(*(uint8_t*)0x20005fb5 = 0);
  NONFAILING(*(uint16_t*)0x20005fb6 = htobe16(0x86dd));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20005fb8, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20005fb8, 6, 4, 4));
  NONFAILING(memcpy((void*)0x20005fb9, "\xc8\xfb\xa2", 3));
  NONFAILING(*(uint16_t*)0x20005fbc = htobe16(0x18));
  NONFAILING(*(uint8_t*)0x20005fbe = 0);
  NONFAILING(*(uint8_t*)0x20005fbf = 0);
  NONFAILING(*(uint8_t*)0x20005fc0 = 0);
  NONFAILING(*(uint8_t*)0x20005fc1 = 0);
  NONFAILING(*(uint8_t*)0x20005fc2 = 0);
  NONFAILING(*(uint8_t*)0x20005fc3 = 0);
  NONFAILING(*(uint8_t*)0x20005fc4 = 0);
  NONFAILING(*(uint8_t*)0x20005fc5 = 0);
  NONFAILING(*(uint8_t*)0x20005fc6 = 0);
  NONFAILING(*(uint8_t*)0x20005fc7 = 0);
  NONFAILING(*(uint8_t*)0x20005fc8 = 0);
  NONFAILING(*(uint8_t*)0x20005fc9 = 0);
  NONFAILING(*(uint8_t*)0x20005fca = 0);
  NONFAILING(*(uint8_t*)0x20005fcb = 0);
  NONFAILING(*(uint8_t*)0x20005fcc = 0);
  NONFAILING(*(uint8_t*)0x20005fcd = 0);
  NONFAILING(*(uint8_t*)0x20005fce = 0);
  NONFAILING(*(uint8_t*)0x20005fcf = 0);
  NONFAILING(*(uint8_t*)0x20005fd0 = -1);
  NONFAILING(*(uint8_t*)0x20005fd1 = 2);
  NONFAILING(*(uint8_t*)0x20005fd2 = 0);
  NONFAILING(*(uint8_t*)0x20005fd3 = 0);
  NONFAILING(*(uint8_t*)0x20005fd4 = 0);
  NONFAILING(*(uint8_t*)0x20005fd5 = 0);
  NONFAILING(*(uint8_t*)0x20005fd6 = 0);
  NONFAILING(*(uint8_t*)0x20005fd7 = 0);
  NONFAILING(*(uint8_t*)0x20005fd8 = 0);
  NONFAILING(*(uint8_t*)0x20005fd9 = 0);
  NONFAILING(*(uint8_t*)0x20005fda = 0);
  NONFAILING(*(uint8_t*)0x20005fdb = 0);
  NONFAILING(*(uint8_t*)0x20005fdc = 0);
  NONFAILING(*(uint8_t*)0x20005fdd = 0);
  NONFAILING(*(uint8_t*)0x20005fde = 0);
  NONFAILING(*(uint8_t*)0x20005fdf = 1);
  NONFAILING(*(uint8_t*)0x20005fe0 = 0);
  NONFAILING(*(uint8_t*)0x20005fe1 = 0);
  NONFAILING(*(uint16_t*)0x20005fe2 = 0);
  NONFAILING(*(uint16_t*)0x20005fe4 = htobe16(0));
  NONFAILING(*(uint16_t*)0x20005fe6 = 0);
  NONFAILING(*(uint8_t*)0x20005fe8 = 0xfe);
  NONFAILING(*(uint8_t*)0x20005fe9 = 0x80);
  NONFAILING(*(uint8_t*)0x20005fea = 0);
  NONFAILING(*(uint8_t*)0x20005feb = 0);
  NONFAILING(*(uint8_t*)0x20005fec = 0);
  NONFAILING(*(uint8_t*)0x20005fed = 0);
  NONFAILING(*(uint8_t*)0x20005fee = 0);
  NONFAILING(*(uint8_t*)0x20005fef = 0);
  NONFAILING(*(uint8_t*)0x20005ff0 = 0);
  NONFAILING(*(uint8_t*)0x20005ff1 = 0);
  NONFAILING(*(uint8_t*)0x20005ff2 = 0);
  NONFAILING(*(uint8_t*)0x20005ff3 = 0);
  NONFAILING(*(uint8_t*)0x20005ff4 = 0);
  NONFAILING(*(uint8_t*)0x20005ff5 = 0);
  NONFAILING(*(uint8_t*)0x20005ff6 = 0);
  NONFAILING(*(uint8_t*)0x20005ff7 = 0xaa);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20005fc0, 16));
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20005fd0, 16));
  uint32_t csum_1_chunk_2 = 0x18000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x3a000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20005fe0, 24));
  NONFAILING(*(uint16_t*)0x20005fe2 = csum_inet_digest(&csum_1));
  r[2] = syscall(__NR_socket, 0x10, 3, 6);
  NONFAILING(*(uint64_t*)0x20629000 = 0x2059cff4);
  NONFAILING(*(uint32_t*)0x20629008 = 0xc);
  NONFAILING(*(uint64_t*)0x20629010 = 0x20f9bff0);
  NONFAILING(*(uint64_t*)0x20629018 = 1);
  NONFAILING(*(uint64_t*)0x20629020 = 0);
  NONFAILING(*(uint64_t*)0x20629028 = 0);
  NONFAILING(*(uint32_t*)0x20629030 = 0);
  NONFAILING(*(uint16_t*)0x2059cff4 = 0x10);
  NONFAILING(*(uint16_t*)0x2059cff6 = 0);
  NONFAILING(*(uint32_t*)0x2059cff8 = 0);
  NONFAILING(*(uint32_t*)0x2059cffc = 0);
  NONFAILING(*(uint64_t*)0x20f9bff0 = 0x20e45000);
  NONFAILING(*(uint64_t*)0x20f9bff8 = 0xb8);
  NONFAILING(*(uint32_t*)0x20e45000 = 0xb8);
  NONFAILING(*(uint16_t*)0x20e45004 = 0x19);
  NONFAILING(*(uint16_t*)0x20e45006 = 0x401);
  NONFAILING(*(uint32_t*)0x20e45008 = 0);
  NONFAILING(*(uint32_t*)0x20e4500c = 0);
  NONFAILING(*(uint32_t*)0x20e45010 = htobe32(0xe0000001));
  NONFAILING(*(uint8_t*)0x20e45020 = 0xac);
  NONFAILING(*(uint8_t*)0x20e45021 = 0x14);
  NONFAILING(*(uint8_t*)0x20e45022 = 0);
  NONFAILING(*(uint8_t*)0x20e45023 = 0);
  NONFAILING(*(uint16_t*)0x20e45030 = 0);
  NONFAILING(*(uint16_t*)0x20e45032 = htobe16(0));
  NONFAILING(*(uint16_t*)0x20e45034 = 0);
  NONFAILING(*(uint16_t*)0x20e45036 = htobe16(0));
  NONFAILING(*(uint16_t*)0x20e45038 = 0xa);
  NONFAILING(*(uint8_t*)0x20e4503a = 0);
  NONFAILING(*(uint8_t*)0x20e4503b = 0);
  NONFAILING(*(uint8_t*)0x20e4503c = 0);
  NONFAILING(*(uint32_t*)0x20e45040 = 0);
  NONFAILING(*(uint32_t*)0x20e45044 = 0);
  NONFAILING(*(uint64_t*)0x20e45048 = 0);
  NONFAILING(*(uint64_t*)0x20e45050 = 0);
  NONFAILING(*(uint64_t*)0x20e45058 = 0);
  NONFAILING(*(uint64_t*)0x20e45060 = 0);
  NONFAILING(*(uint64_t*)0x20e45068 = 0);
  NONFAILING(*(uint64_t*)0x20e45070 = 0);
  NONFAILING(*(uint64_t*)0x20e45078 = 0);
  NONFAILING(*(uint64_t*)0x20e45080 = 0);
  NONFAILING(*(uint64_t*)0x20e45088 = 0);
  NONFAILING(*(uint64_t*)0x20e45090 = 0);
  NONFAILING(*(uint64_t*)0x20e45098 = 0);
  NONFAILING(*(uint64_t*)0x20e450a0 = 0);
  NONFAILING(*(uint32_t*)0x20e450a8 = 0);
  NONFAILING(*(uint32_t*)0x20e450ac = 0);
  NONFAILING(*(uint8_t*)0x20e450b0 = 0);
  NONFAILING(*(uint8_t*)0x20e450b1 = 0);
  NONFAILING(*(uint8_t*)0x20e450b2 = 0);
  NONFAILING(*(uint8_t*)0x20e450b3 = 0);
  syscall(__NR_sendmsg, r[2], 0x20629000, 0);
}

int main()
{
  install_segv_handler();
  for (;;) {
    loop();
  }
}