// https://syzkaller.appspot.com/bug?id=253324b496b749185232dff7c28a7ffb42c377aa
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <linux/net.h>
#include <netinet/in.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.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;
}

#define XT_TABLE_SIZE 1536
#define XT_MAX_ENTRIES 10

struct xt_counters {
  uint64_t pcnt, bcnt;
};

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[XT_TABLE_SIZE / sizeof(void*)];
};

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[XT_TABLE_SIZE];
};

struct ipt_table_desc {
  const char* name;
  struct ipt_getinfo info;
  struct ipt_replace replace;
};

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

static struct ipt_table_desc ipv6_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)

struct arpt_getinfo {
  char name[32];
  unsigned int valid_hooks;
  unsigned int hook_entry[3];
  unsigned int underflow[3];
  unsigned int num_entries;
  unsigned int size;
};

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

struct arpt_replace {
  char name[32];
  unsigned int valid_hooks;
  unsigned int num_entries;
  unsigned int size;
  unsigned int hook_entry[3];
  unsigned int underflow[3];
  unsigned int num_counters;
  struct xt_counters* counters;
  char entrytable[XT_TABLE_SIZE];
};

struct arpt_table_desc {
  const char* name;
  struct arpt_getinfo info;
  struct arpt_replace replace;
};

static struct arpt_table_desc arpt_tables[] = {
    {.name = "filter"},
};

#define ARPT_BASE_CTL 96
#define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
#define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
#define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)

static void checkpoint_iptables(struct ipt_table_desc* tables, int num_tables,
                                int family, int level)
{
  struct ipt_get_entries entries;
  socklen_t optlen;
  int fd, i;

  fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1)
    fail("socket(%d, SOCK_STREAM, IPPROTO_TCP)", family);
  for (i = 0; i < num_tables; i++) {
    struct ipt_table_desc* table = &tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, level, 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->replace.entrytable))
      fail("table size is too large: %u", table->info.size);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      fail("too many counters: %u", table->info.num_entries);
    memset(&entries, 0, sizeof(entries));
    strcpy(entries.name, table->name);
    entries.size = table->info.size;
    optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
    if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &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.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, entries.entrytable, table->info.size);
  }
  close(fd);
}

static void reset_iptables(struct ipt_table_desc* tables, int num_tables,
                           int family, int level)
{
  struct xt_counters counters[XT_MAX_ENTRIES];
  struct ipt_get_entries entries;
  struct ipt_getinfo info;
  socklen_t optlen;
  int fd, i;

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

static void checkpoint_arptables(void)
{
  struct arpt_get_entries entries;
  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(arpt_tables) / sizeof(arpt_tables[0]); i++) {
    struct arpt_table_desc* table = &arpt_tables[i];
    strcpy(table->info.name, table->name);
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->info);
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &table->info, &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      fail("getsockopt(ARPT_SO_GET_INFO)");
    }
    if (table->info.size > sizeof(table->replace.entrytable))
      fail("table size is too large: %u", table->info.size);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      fail("too many counters: %u", table->info.num_entries);
    memset(&entries, 0, sizeof(entries));
    strcpy(entries.name, table->name);
    entries.size = table->info.size;
    optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
      fail("getsockopt(ARPT_SO_GET_ENTRIES)");
    table->replace.valid_hooks = table->info.valid_hooks;
    table->replace.num_entries = table->info.num_entries;
    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, entries.entrytable, table->info.size);
  }
  close(fd);
}

static void reset_arptables()
{
  struct xt_counters counters[XT_MAX_ENTRIES];
  struct arpt_get_entries entries;
  struct arpt_getinfo info;
  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(arpt_tables) / sizeof(arpt_tables[0]); i++) {
    struct arpt_table_desc* table = &arpt_tables[i];
    if (table->info.valid_hooks == 0)
      continue;
    memset(&info, 0, sizeof(info));
    strcpy(info.name, table->name);
    optlen = sizeof(info);
    if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &info, &optlen))
      fail("getsockopt(ARPT_SO_GET_INFO)");
    if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
        fail("getsockopt(ARPT_SO_GET_ENTRIES)");
      if (memcmp(table->replace.entrytable, entries.entrytable,
                 table->info.size) == 0)
        continue;
    }
    table->replace.num_counters = info.num_entries;
    table->replace.counters = counters;
    optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
             table->replace.size;
    if (setsockopt(fd, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen))
      fail("setsockopt(ARPT_SO_SET_REPLACE)");
  }
  close(fd);
}

static void checkpoint_net_namespace(void)
{
  checkpoint_arptables();
  checkpoint_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                      AF_INET, SOL_IP);
  checkpoint_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                      AF_INET6, SOL_IPV6);
}

static void reset_net_namespace(void)
{
  reset_arptables();
  reset_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                 AF_INET, SOL_IP);
  reset_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                 AF_INET6, SOL_IPV6);
}

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();
  }
}

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;
      }
    }
  }
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

long r[3];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x20000000 = 0xe8);
    syscall(__NR_getsockopt, -1, 0, 0x11, 0x20000f18, 0x20000000);
    break;
  case 2:
    r[0] = syscall(__NR_socket, 2, 1, 0);
    break;
  case 3:
    NONFAILING(*(uint16_t*)0x20e5b000 = 2);
    NONFAILING(*(uint16_t*)0x20e5b002 = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint32_t*)0x20e5b004 = htobe32(0xe0000001));
    NONFAILING(*(uint8_t*)0x20e5b008 = 0);
    NONFAILING(*(uint8_t*)0x20e5b009 = 0);
    NONFAILING(*(uint8_t*)0x20e5b00a = 0);
    NONFAILING(*(uint8_t*)0x20e5b00b = 0);
    NONFAILING(*(uint8_t*)0x20e5b00c = 0);
    NONFAILING(*(uint8_t*)0x20e5b00d = 0);
    NONFAILING(*(uint8_t*)0x20e5b00e = 0);
    NONFAILING(*(uint8_t*)0x20e5b00f = 0);
    syscall(__NR_bind, r[0], 0x20e5b000, 0x10);
    break;
  case 4:
    NONFAILING(*(uint16_t*)0x20ccb000 = 2);
    NONFAILING(*(uint16_t*)0x20ccb002 = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint32_t*)0x20ccb004 = htobe32(0));
    NONFAILING(*(uint8_t*)0x20ccb008 = 0);
    NONFAILING(*(uint8_t*)0x20ccb009 = 0);
    NONFAILING(*(uint8_t*)0x20ccb00a = 0);
    NONFAILING(*(uint8_t*)0x20ccb00b = 0);
    NONFAILING(*(uint8_t*)0x20ccb00c = 0);
    NONFAILING(*(uint8_t*)0x20ccb00d = 0);
    NONFAILING(*(uint8_t*)0x20ccb00e = 0);
    NONFAILING(*(uint8_t*)0x20ccb00f = 0);
    syscall(__NR_connect, r[0], 0x20ccb000, 0x10);
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20eb0fb8 = 1);
    NONFAILING(*(uint32_t*)0x20eb0fbc = 3);
    NONFAILING(*(uint64_t*)0x20eb0fc0 = 0x209ff000);
    NONFAILING(*(uint64_t*)0x20eb0fc8 = 0x202bf000);
    NONFAILING(*(uint32_t*)0x20eb0fd0 = 4);
    NONFAILING(*(uint32_t*)0x20eb0fd4 = 0x38b);
    NONFAILING(*(uint64_t*)0x20eb0fd8 = 0x206ab000);
    NONFAILING(*(uint32_t*)0x20eb0fe0 = 0);
    NONFAILING(*(uint32_t*)0x20eb0fe4 = 0);
    NONFAILING(*(uint8_t*)0x20eb0fe8 = 0);
    NONFAILING(*(uint8_t*)0x20eb0fe9 = 0);
    NONFAILING(*(uint8_t*)0x20eb0fea = 0);
    NONFAILING(*(uint8_t*)0x20eb0feb = 0);
    NONFAILING(*(uint8_t*)0x20eb0fec = 0);
    NONFAILING(*(uint8_t*)0x20eb0fed = 0);
    NONFAILING(*(uint8_t*)0x20eb0fee = 0);
    NONFAILING(*(uint8_t*)0x20eb0fef = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff0 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff1 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff2 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff3 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff4 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff5 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff6 = 0);
    NONFAILING(*(uint8_t*)0x20eb0ff7 = 0);
    NONFAILING(*(uint32_t*)0x20eb0ff8 = 0);
    NONFAILING(*(uint8_t*)0x209ff000 = 0x18);
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x209ff001, 0, 0, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x209ff001, 0, 4, 4));
    NONFAILING(*(uint16_t*)0x209ff002 = 0);
    NONFAILING(*(uint32_t*)0x209ff004 = 0x80000001);
    NONFAILING(*(uint8_t*)0x209ff008 = 0);
    NONFAILING(*(uint8_t*)0x209ff009 = 0);
    NONFAILING(*(uint16_t*)0x209ff00a = 0);
    NONFAILING(*(uint32_t*)0x209ff00c = 0);
    NONFAILING(*(uint8_t*)0x209ff010 = 0x95);
    NONFAILING(*(uint8_t*)0x209ff011 = 0);
    NONFAILING(*(uint16_t*)0x209ff012 = 0);
    NONFAILING(*(uint32_t*)0x209ff014 = 0);
    NONFAILING(memcpy((void*)0x202bf000, "syzkaller", 10));
    r[1] = syscall(__NR_bpf, 5, 0x20eb0fb8, 0x48);
    break;
  case 6:
    r[2] = syscall(__NR_socket, 0x29, 2, 0);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x2031aff8 = r[0]);
    NONFAILING(*(uint32_t*)0x2031affc = r[1]);
    syscall(__NR_ioctl, r[2], 0x89e0, 0x2031aff8);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x20000000 = 0);
    NONFAILING(*(uint16_t*)0x20000008 = 2);
    NONFAILING(*(uint16_t*)0x2000000a = htobe16(0x4e20 + procid * 4));
    NONFAILING(*(uint32_t*)0x2000000c = htobe32(0x7f000001));
    NONFAILING(*(uint8_t*)0x20000010 = 0);
    NONFAILING(*(uint8_t*)0x20000011 = 0);
    NONFAILING(*(uint8_t*)0x20000012 = 0);
    NONFAILING(*(uint8_t*)0x20000013 = 0);
    NONFAILING(*(uint8_t*)0x20000014 = 0);
    NONFAILING(*(uint8_t*)0x20000015 = 0);
    NONFAILING(*(uint8_t*)0x20000016 = 0);
    NONFAILING(*(uint8_t*)0x20000017 = 0);
    NONFAILING(*(uint64_t*)0x20000018 = 0);
    NONFAILING(*(uint64_t*)0x20000020 = 0);
    NONFAILING(*(uint64_t*)0x20000028 = 0);
    NONFAILING(*(uint64_t*)0x20000030 = 0);
    NONFAILING(*(uint64_t*)0x20000038 = 0);
    NONFAILING(*(uint64_t*)0x20000040 = 0);
    NONFAILING(*(uint64_t*)0x20000048 = 0);
    NONFAILING(*(uint64_t*)0x20000050 = 0);
    NONFAILING(*(uint64_t*)0x20000058 = 0);
    NONFAILING(*(uint64_t*)0x20000060 = 0);
    NONFAILING(*(uint64_t*)0x20000068 = 0);
    NONFAILING(*(uint64_t*)0x20000070 = 0);
    NONFAILING(*(uint64_t*)0x20000078 = 0);
    NONFAILING(*(uint64_t*)0x20000080 = 0);
    NONFAILING(*(uint64_t*)0x20000088 = 0);
    NONFAILING(*(uint16_t*)0x20000090 = 0x100);
    NONFAILING(*(uint16_t*)0x20000092 = 0x90a0);
    NONFAILING(*(uint32_t*)0x20000ffc = 0x98);
    syscall(__NR_getsockopt, 0xffffff9c, 0x84, 0x1f, 0x20000000, 0x20000ffc);
    break;
  case 9:
    NONFAILING(*(uint8_t*)0x20004fb1 = 1);
    NONFAILING(*(uint8_t*)0x20004fb2 = 0x80);
    NONFAILING(*(uint8_t*)0x20004fb3 = 0xc2);
    NONFAILING(*(uint8_t*)0x20004fb4 = 0);
    NONFAILING(*(uint8_t*)0x20004fb5 = 0);
    NONFAILING(*(uint8_t*)0x20004fb6 = 0);
    NONFAILING(*(uint8_t*)0x20004fb7 = 0xaa);
    NONFAILING(*(uint8_t*)0x20004fb8 = 0xaa);
    NONFAILING(*(uint8_t*)0x20004fb9 = 0xaa);
    NONFAILING(*(uint8_t*)0x20004fba = 0xaa);
    NONFAILING(*(uint8_t*)0x20004fbb = 0);
    NONFAILING(*(uint8_t*)0x20004fbc = 0);
    NONFAILING(*(uint16_t*)0x20004fbd = htobe16(0x800));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20004fbf, 5, 0, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20004fbf, 4, 4, 4));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20004fc0, 0, 0, 2));
    NONFAILING(STORE_BY_BITMASK(uint8_t, 0x20004fc0, 0, 2, 6));
    NONFAILING(*(uint16_t*)0x20004fc1 = htobe16(0x1c));
    NONFAILING(*(uint16_t*)0x20004fc3 = 0);
    NONFAILING(*(uint16_t*)0x20004fc5 = htobe16(0));
    NONFAILING(*(uint8_t*)0x20004fc7 = 0);
    NONFAILING(*(uint8_t*)0x20004fc8 = 0x11);
    NONFAILING(*(uint16_t*)0x20004fc9 = 0);
    NONFAILING(*(uint8_t*)0x20004fcb = 0xac);
    NONFAILING(*(uint8_t*)0x20004fcc = 0x14);
    NONFAILING(*(uint8_t*)0x20004fcd = 0);
    NONFAILING(*(uint8_t*)0x20004fce = 0xaa);
    NONFAILING(*(uint32_t*)0x20004fcf = htobe32(0xe0000001));
    NONFAILING(*(uint16_t*)0x20004fd3 = 0);
    NONFAILING(*(uint16_t*)0x20004fd5 = htobe16(0x4e23 + procid * 4));
    NONFAILING(*(uint16_t*)0x20004fd7 = htobe16(8));
    NONFAILING(*(uint16_t*)0x20004fd9 = 0);
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20004fcb, 4));
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20004fcf, 4));
    uint16_t csum_1_chunk_2 = 0x1100;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
    uint16_t csum_1_chunk_3 = 0x800;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
    NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20004fd3, 8));
    NONFAILING(*(uint16_t*)0x20004fd9 = csum_inet_digest(&csum_1));
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    NONFAILING(csum_inet_update(&csum_2, (const uint8_t*)0x20004fbf, 20));
    NONFAILING(*(uint16_t*)0x20004fc9 = csum_inet_digest(&csum_2));
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(10);
  collide = 1;
  execute(10);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}