// https://syzkaller.appspot.com/bug?id=2576ffa473c0be4060c9201f23e9b4d26724816d
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.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/net.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.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 <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.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 exitf(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(kRetryStatus);
}

#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;                                                  \
  }

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;
}

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

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);
}

#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);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      fail("command '%s' failed: %d", &command[0], rv);
  }
}

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

  execute_command(0, "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 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(0, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(0, "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 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);
}

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};

  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 type veth");

  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");

  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]);
  }
}

static int read_tun(char* data, int size)
{
  if (tunfd < 0)
    return -1;

  int rv = read(tunfd, data, size);
  if (rv < 0) {
    if (errno == EAGAIN)
      return -1;
    if (errno == EBADFD)
      return -1;
    fail("tun: read failed with %d", rv);
  }
  return rv;
}

static void flush_tun()
{
  char data[SYZ_TUN_MAX_PACKET_SIZE];
  while (read_tun(&data[0], sizeof(data)) != -1)
    ;
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static void setup_cgroups()
{
  if (mkdir("/syzcgroup", 0777)) {
  }
  if (mkdir("/syzcgroup/unified", 0777)) {
  }
  if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
  }
  if (chmod("/syzcgroup/unified", 0777)) {
  }
  if (!write_file("/syzcgroup/unified/cgroup.subtree_control",
                  "+cpu +memory +io +pids +rdma")) {
  }
  if (mkdir("/syzcgroup/cpu", 0777)) {
  }
  if (mount("none", "/syzcgroup/cpu", "cgroup", 0,
            "cpuset,cpuacct,perf_event,hugetlb")) {
  }
  if (!write_file("/syzcgroup/cpu/cgroup.clone_children", "1")) {
  }
  if (chmod("/syzcgroup/cpu", 0777)) {
  }
  if (mkdir("/syzcgroup/net", 0777)) {
  }
  if (mount("none", "/syzcgroup/net", "cgroup", 0,
            "net_cls,net_prio,devices,freezer")) {
  }
  if (chmod("/syzcgroup/net", 0777)) {
  }
}

static void setup_binfmt_misc()
{
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz0:M:0:syz0::./file0:")) {
  }
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz1:M:1:yz1::./file0:POC")) {
  }
}

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 = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    fail("sandbox fork failed");
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);

  setup_cgroups();
  setup_binfmt_misc();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  initialize_tun();
  initialize_netdevices();
  loop();
  doexit(1);
}

#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) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    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) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    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) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    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) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    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);
}
#include <linux/if.h>
#include <linux/netfilter_bridge/ebtables.h>

struct ebt_table_desc {
  const char* name;
  struct ebt_replace replace;
  char entrytable[XT_TABLE_SIZE];
};

static struct ebt_table_desc ebt_tables[] = {
    {.name = "filter"}, {.name = "nat"}, {.name = "broute"},
};

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

  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  }
  for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
    struct ebt_table_desc* table = &ebt_tables[i];
    strcpy(table->replace.name, table->name);
    optlen = sizeof(table->replace);
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_INFO, &table->replace,
                   &optlen)) {
      switch (errno) {
      case EPERM:
      case ENOENT:
      case ENOPROTOOPT:
        continue;
      }
      fail("getsockopt(EBT_SO_GET_INIT_INFO)");
    }
    if (table->replace.entries_size > sizeof(table->entrytable))
      fail("table size is too large: %u", table->replace.entries_size);
    table->replace.num_counters = 0;
    table->replace.entries = table->entrytable;
    optlen = sizeof(table->replace) + table->replace.entries_size;
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_ENTRIES, &table->replace,
                   &optlen))
      fail("getsockopt(EBT_SO_GET_INIT_ENTRIES)");
  }
  close(fd);
}

static void reset_ebtables()
{
  struct ebt_replace replace;
  char entrytable[XT_TABLE_SIZE];
  socklen_t optlen;
  unsigned i, j, h;
  int fd;

  fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
  if (fd == -1) {
    switch (errno) {
    case EAFNOSUPPORT:
    case ENOPROTOOPT:
      return;
    }
    fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)");
  }
  for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
    struct ebt_table_desc* table = &ebt_tables[i];
    if (table->replace.valid_hooks == 0)
      continue;
    memset(&replace, 0, sizeof(replace));
    strcpy(replace.name, table->name);
    optlen = sizeof(replace);
    if (getsockopt(fd, SOL_IP, EBT_SO_GET_INFO, &replace, &optlen))
      fail("getsockopt(EBT_SO_GET_INFO)");
    replace.num_counters = 0;
    table->replace.entries = 0;
    for (h = 0; h < NF_BR_NUMHOOKS; h++)
      table->replace.hook_entry[h] = 0;
    if (memcmp(&table->replace, &replace, sizeof(table->replace)) == 0) {
      memset(&entrytable, 0, sizeof(entrytable));
      replace.entries = entrytable;
      optlen = sizeof(replace) + replace.entries_size;
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_ENTRIES, &replace, &optlen))
        fail("getsockopt(EBT_SO_GET_ENTRIES)");
      if (memcmp(table->entrytable, entrytable, replace.entries_size) == 0)
        continue;
    }
    for (j = 0, h = 0; h < NF_BR_NUMHOOKS; h++) {
      if (table->replace.valid_hooks & (1 << h)) {
        table->replace.hook_entry[h] =
            (struct ebt_entries*)table->entrytable + j;
        j++;
      }
    }
    table->replace.entries = table->entrytable;
    optlen = sizeof(table->replace) + table->replace.entries_size;
    if (setsockopt(fd, SOL_IP, EBT_SO_SET_ENTRIES, &table->replace, optlen))
      fail("setsockopt(EBT_SO_SET_ENTRIES)");
  }
  close(fd);
}

static void checkpoint_net_namespace(void)
{
  checkpoint_ebtables();
  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_ebtables();
  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 remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exitf("opendir(%s) failed due to NOFILE, exiting", dir);
    }
    exitf("opendir(%s) failed", dir);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exitf("lstat(%s) failed", filename);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exitf("unlink(%s) failed", filename);
      if (umount2(filename, MNT_DETACH))
        exitf("umount(%s) failed", filename);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exitf("umount(%s) failed", dir);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exitf("rmdir(%s) failed", dir);
  }
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  checkpoint_net_namespace();
  char cgroupdir[64];
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
  char cgroupdir_cpu[64];
  snprintf(cgroupdir_cpu, sizeof(cgroupdir_cpu), "/syzcgroup/cpu/syz%llu",
           procid);
  char cgroupdir_net[64];
  snprintf(cgroupdir_net, sizeof(cgroupdir_net), "/syzcgroup/net/syz%llu",
           procid);
  if (mkdir(cgroupdir, 0777)) {
  }
  if (mkdir(cgroupdir_cpu, 0777)) {
  }
  if (mkdir(cgroupdir_net, 0777)) {
  }
  int pid = getpid();
  char procs_file[128];
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir);
  if (!write_file(procs_file, "%d", pid)) {
  }
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_cpu);
  if (!write_file(procs_file, "%d", pid)) {
  }
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_net);
  if (!write_file(procs_file, "%d", pid)) {
  }
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      fail("failed to mkdir");
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      if (chdir(cwdbuf))
        fail("failed to chdir");
      if (symlink(cgroupdir, "./cgroup")) {
      }
      if (symlink(cgroupdir_cpu, "./cgroup.cpu")) {
      }
      if (symlink(cgroupdir_net, "./cgroup.net")) {
      }
      flush_tun();
      execute_one();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      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)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
    remove_dir(cwdbuf);
    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 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);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (__atomic_load_n(&running, __ATOMIC_RELAXED))
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0x0};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000000, "./file0", 8));
    syscall(__NR_mkdirat, 0xffffff9c, 0x20000000, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x200001c0, "/selinux/enforce", 17));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x200001c0, 0x200000, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    syscall(__NR_ioctl, r[0], 0x8008700b, 0x20000240);
    break;
  case 3:
    NONFAILING(memcpy((void*)0x20000280, "/dev/fuse", 10));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000280, 2, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    NONFAILING(*(uint64_t*)0x200000c0 = 9);
    syscall(__NR_sched_setaffinity, 0, 7, 0x200000c0);
    break;
  case 5:
    NONFAILING(memcpy((void*)0x20000100, "/dev/rfkill", 12));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000100, 0, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 6:
    NONFAILING(*(uint32_t*)0x20000040 = 1);
    NONFAILING(*(uint32_t*)0x20000044 = 0x70);
    NONFAILING(*(uint8_t*)0x20000048 = 0);
    NONFAILING(*(uint8_t*)0x20000049 = 0);
    NONFAILING(*(uint8_t*)0x2000004a = 0);
    NONFAILING(*(uint8_t*)0x2000004b = 0);
    NONFAILING(*(uint32_t*)0x2000004c = 0);
    NONFAILING(*(uint64_t*)0x20000050 = 0x50d);
    NONFAILING(*(uint64_t*)0x20000058 = 0);
    NONFAILING(*(uint64_t*)0x20000060 = 0);
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 1, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 2, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 3, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 4, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 5, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 6, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 7, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 8, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 9, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 10, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 11, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 12, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 13, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 14, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 15, 2));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 17, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 18, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 19, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 20, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 21, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 22, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 23, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 24, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 25, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 26, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 27, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 28, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 29, 35));
    NONFAILING(*(uint32_t*)0x20000070 = 0);
    NONFAILING(*(uint32_t*)0x20000074 = 0);
    NONFAILING(*(uint64_t*)0x20000078 = 0x20000000);
    NONFAILING(*(uint64_t*)0x20000080 = 0);
    NONFAILING(*(uint64_t*)0x20000088 = 0);
    NONFAILING(*(uint64_t*)0x20000090 = 0);
    NONFAILING(*(uint32_t*)0x20000098 = 0);
    NONFAILING(*(uint32_t*)0x2000009c = 0);
    NONFAILING(*(uint64_t*)0x200000a0 = 0);
    NONFAILING(*(uint32_t*)0x200000a8 = 0);
    NONFAILING(*(uint16_t*)0x200000ac = 0);
    NONFAILING(*(uint16_t*)0x200000ae = 0);
    syscall(__NR_perf_event_open, 0x20000040, 0, 0, -1, 0);
    break;
  case 7:
    syscall(__NR_ioctl, -1, 0x4c00, -1);
    break;
  case 8:
    syscall(__NR_fchown, -1, 0, 0);
    break;
  case 9:
    NONFAILING(memcpy((void*)0x208deff8, "./file0", 8));
    NONFAILING(memcpy((void*)0x20000040, "./file0", 8));
    NONFAILING(memcpy((void*)0x2015bffc, "nfs", 4));
    syscall(__NR_mount, 0x208deff8, 0x20000040, 0x2015bffc, 0x7a00, 0x20000000);
    break;
  case 10:
    NONFAILING(*(uint32_t*)0x200004c0 = 0x80);
    res = syscall(__NR_getpeername, r[0], 0x20000400, 0x200004c0);
    if (res != -1)
      NONFAILING(r[3] = *(uint32_t*)0x20000404);
    break;
  case 11:
    NONFAILING(*(uint64_t*)0x200008c0 = 0x200003c0);
    NONFAILING(*(uint16_t*)0x200003c0 = 0x10);
    NONFAILING(*(uint16_t*)0x200003c2 = 0);
    NONFAILING(*(uint32_t*)0x200003c4 = 0);
    NONFAILING(*(uint32_t*)0x200003c8 = 0x2000000);
    NONFAILING(*(uint32_t*)0x200008c8 = 0xc);
    NONFAILING(*(uint64_t*)0x200008d0 = 0x20000580);
    NONFAILING(*(uint64_t*)0x20000580 = 0x20000500);
    NONFAILING(*(uint32_t*)0x20000500 = 0x4c);
    NONFAILING(*(uint16_t*)0x20000504 = 0x2e);
    NONFAILING(*(uint16_t*)0x20000506 = 8);
    NONFAILING(*(uint32_t*)0x20000508 = 0x70bd28);
    NONFAILING(*(uint32_t*)0x2000050c = 0x25dfdbfc);
    NONFAILING(*(uint8_t*)0x20000510 = 0);
    NONFAILING(*(uint32_t*)0x20000514 = r[3]);
    NONFAILING(*(uint16_t*)0x20000518 = 0);
    NONFAILING(*(uint16_t*)0x2000051a = 0xf);
    NONFAILING(*(uint16_t*)0x2000051c = -1);
    NONFAILING(*(uint16_t*)0x2000051e = -1);
    NONFAILING(*(uint16_t*)0x20000520 = -1);
    NONFAILING(*(uint16_t*)0x20000522 = 0xffe0);
    NONFAILING(*(uint16_t*)0x20000524 = 8);
    NONFAILING(*(uint16_t*)0x20000526 = 0xb);
    NONFAILING(*(uint32_t*)0x20000528 = 0x90);
    NONFAILING(*(uint16_t*)0x2000052c = 8);
    NONFAILING(*(uint16_t*)0x2000052e = 0xb);
    NONFAILING(*(uint32_t*)0x20000530 = 0x8000);
    NONFAILING(*(uint16_t*)0x20000534 = 8);
    NONFAILING(*(uint16_t*)0x20000536 = 0xb);
    NONFAILING(*(uint32_t*)0x20000538 = 1);
    NONFAILING(*(uint16_t*)0x2000053c = 8);
    NONFAILING(*(uint16_t*)0x2000053e = 0xb);
    NONFAILING(*(uint32_t*)0x20000540 = 0x881f);
    NONFAILING(*(uint16_t*)0x20000544 = 8);
    NONFAILING(*(uint16_t*)0x20000546 = 0xb);
    NONFAILING(*(uint32_t*)0x20000548 = 0x7ff);
    NONFAILING(*(uint64_t*)0x20000588 = 0x4c);
    NONFAILING(*(uint64_t*)0x200008d8 = 1);
    NONFAILING(*(uint64_t*)0x200008e0 = 0);
    NONFAILING(*(uint64_t*)0x200008e8 = 0);
    NONFAILING(*(uint32_t*)0x200008f0 = 0x8010);
    syscall(__NR_sendmsg, r[2], 0x200008c0, 4);
    break;
  case 12:
    NONFAILING(*(uint64_t*)0x20000700 = 0);
    NONFAILING(*(uint64_t*)0x20000708 = 0xfffffffffffffffc);
    NONFAILING(*(uint32_t*)0x20000710 = 4);
    NONFAILING(*(uint32_t*)0x20000714 = 0xaa);
    NONFAILING(*(uint32_t*)0x20000718 = 7);
    NONFAILING(*(uint64_t*)0x20000720 = 2);
    NONFAILING(*(uint64_t*)0x20000728 = 6);
    NONFAILING(*(uint64_t*)0x20000730 = 0);
    NONFAILING(*(uint64_t*)0x20000738 = 0);
    NONFAILING(*(uint64_t*)0x20000740 = 0);
    NONFAILING(*(uint32_t*)0x20000748 = 0);
    NONFAILING(*(uint32_t*)0x2000074c = 0);
    NONFAILING(*(uint32_t*)0x20000750 = 0);
    NONFAILING(*(uint32_t*)0x20000754 = 0);
    NONFAILING(*(uint64_t*)0x20000758 = 5);
    NONFAILING(*(uint64_t*)0x20000760 = 0xffff);
    NONFAILING(*(uint64_t*)0x20000768 = 0x3ff);
    NONFAILING(*(uint64_t*)0x20000770 = 0);
    NONFAILING(*(uint64_t*)0x20000778 = 0);
    NONFAILING(*(uint32_t*)0x20000780 = 0x2000);
    NONFAILING(*(uint32_t*)0x20000784 = 0);
    NONFAILING(*(uint32_t*)0x20000788 = 0);
    NONFAILING(*(uint32_t*)0x2000078c = 0);
    NONFAILING(*(uint64_t*)0x20000790 = 0x3aa);
    NONFAILING(*(uint64_t*)0x20000798 = 0x45ec);
    NONFAILING(*(uint64_t*)0x200007a0 = 3);
    NONFAILING(*(uint64_t*)0x200007a8 = 0);
    NONFAILING(*(uint64_t*)0x200007b0 = 0);
    NONFAILING(*(uint32_t*)0x200007b8 = 0x1000);
    NONFAILING(*(uint32_t*)0x200007bc = 0);
    NONFAILING(*(uint32_t*)0x200007c0 = 0);
    NONFAILING(*(uint32_t*)0x200007c4 = 0);
    NONFAILING(*(uint64_t*)0x200007c8 = 1);
    NONFAILING(*(uint64_t*)0x200007d0 = 0x7ff);
    NONFAILING(*(uint64_t*)0x200007d8 = 7);
    NONFAILING(*(uint64_t*)0x200007e0 = 0);
    NONFAILING(*(uint64_t*)0x200007e8 = 0);
    NONFAILING(*(uint32_t*)0x200007f0 = 0x80);
    NONFAILING(*(uint32_t*)0x200007f4 = 0);
    NONFAILING(*(uint32_t*)0x200007f8 = 0);
    NONFAILING(*(uint32_t*)0x200007fc = 0);
    NONFAILING(*(uint64_t*)0x20000800 = 0);
    NONFAILING(*(uint64_t*)0x20000808 = 0x800);
    NONFAILING(*(uint64_t*)0x20000810 = 0x20);
    NONFAILING(*(uint64_t*)0x20000818 = 0);
    NONFAILING(*(uint64_t*)0x20000820 = 0);
    NONFAILING(*(uint32_t*)0x20000828 = 0x800);
    NONFAILING(*(uint32_t*)0x2000082c = 0);
    NONFAILING(*(uint32_t*)0x20000830 = 0);
    NONFAILING(*(uint32_t*)0x20000834 = 0);
    NONFAILING(*(uint64_t*)0x20000838 = 0x101);
    NONFAILING(*(uint64_t*)0x20000840 = 0x65);
    NONFAILING(*(uint64_t*)0x20000848 = 3);
    NONFAILING(*(uint64_t*)0x20000850 = 0);
    NONFAILING(*(uint64_t*)0x20000858 = 0);
    NONFAILING(*(uint32_t*)0x20000860 = 0x2000);
    NONFAILING(*(uint32_t*)0x20000864 = 0);
    NONFAILING(*(uint32_t*)0x20000868 = 0);
    NONFAILING(*(uint32_t*)0x2000086c = 0);
    NONFAILING(*(uint64_t*)0x20000870 = 4);
    NONFAILING(*(uint64_t*)0x20000878 = 0xfff);
    NONFAILING(*(uint64_t*)0x20000880 = 0);
    NONFAILING(*(uint64_t*)0x20000888 = 0);
    NONFAILING(*(uint64_t*)0x20000890 = 0);
    NONFAILING(*(uint32_t*)0x20000898 = 0x2200);
    NONFAILING(*(uint32_t*)0x2000089c = 0);
    NONFAILING(*(uint32_t*)0x200008a0 = 0);
    NONFAILING(*(uint32_t*)0x200008a4 = 0);
    syscall(__NR_ioctl, r[0], 0xc020660b, 0x20000700);
    break;
  case 13:
    NONFAILING(*(uint64_t*)0x20000180 = 0x20000000);
    NONFAILING(*(uint16_t*)0x20000000 = 0x10);
    NONFAILING(*(uint16_t*)0x20000002 = 0);
    NONFAILING(*(uint32_t*)0x20000004 = 0);
    NONFAILING(*(uint32_t*)0x20000008 = 0);
    NONFAILING(*(uint32_t*)0x20000188 = 0xc);
    NONFAILING(*(uint64_t*)0x20000190 = 0x20000140);
    NONFAILING(*(uint64_t*)0x20000140 = 0x20000740);
    NONFAILING(*(uint64_t*)0x20000148 = 1);
    NONFAILING(*(uint64_t*)0x20000198 = 1);
    NONFAILING(*(uint64_t*)0x200001a0 = 0);
    NONFAILING(*(uint64_t*)0x200001a8 = 0);
    NONFAILING(*(uint32_t*)0x200001b0 = 0);
    syscall(__NR_sendmsg, -1, 0x20000180, 0);
    break;
  case 14:
    NONFAILING(memcpy((void*)0x20000340,
                      "\x13\x13\x77\xc5\xfc\x35\xd4\x14\x54\xd5\xd4\x1d\x29\xad"
                      "\x1a\x60\x29\x59\x81\x46\xe6\xbe\x16\x6e\x41\xad\x0d\xbd"
                      "\x40\x54\x03\x3c\x9f\x33\xbb\xda\x82\x24\xa2\xf3\xd7\x72"
                      "\xe7\x63\x6e\x48\xb3\x3c\xbf\x70\x83\x72\xe8\xf1\xb9\x93"
                      "\x3e\xc5\x12\x77\x43\xbe\x22\x06\x20\x9e\xf0\x2d\xf9\xcb"
                      "\xf2\xf6\xe8\x80\xd3\x38\x2f\x00",
                      78));
    syscall(__NR_fanotify_mark, r[2], 0x20, 1, r[0], 0x20000340);
    break;
  case 15:
    NONFAILING(memcpy((void*)0x200002c0,
                      "\x13\x13\x77\xc5\xfc\x35\xd4\x14\x54\xd5\xd4\x1d\x29\xad"
                      "\x1a\x60\x29\x59\x81\x46\xe6\xbe\x16\x6e\x41\xad\x0d\xbd"
                      "\x40\x54\x03\x3c\x9f\x33\xbb\xda\x82\x24\xa2\xf3\xd7\x72"
                      "\xe7\x63\x6e\x48\xb3\x3c\xbf\x70\x83\x72\xe8\xf1\xb9\x93"
                      "\x3e\xc5\x12\x77\x43\xbe\x22\x06\x20\x9e\xf0\x2d\xf9\xcb"
                      "\xf2\xf6\xe8\x80\xd3\x38\x2f\x00",
                      78));
    syscall(__NR_mkdir, 0x200002c0, 0);
    break;
  case 16:
    NONFAILING(memcpy((void*)0x20000200, "./file0", 8));
    NONFAILING(memcpy((void*)0x20000300, "fuse", 5));
    NONFAILING(memcpy((void*)0x20000640, "fd", 2));
    NONFAILING(*(uint8_t*)0x20000642 = 0x3d);
    NONFAILING(sprintf((char*)0x20000643, "0x%016llx", (long long)r[1]));
    NONFAILING(*(uint8_t*)0x20000655 = 0x2c);
    NONFAILING(memcpy((void*)0x20000656, "rootmode", 8));
    NONFAILING(*(uint8_t*)0x2000065e = 0x3d);
    NONFAILING(sprintf((char*)0x2000065f, "%023llo", (long long)0x4000));
    NONFAILING(*(uint8_t*)0x20000676 = 0x2c);
    NONFAILING(memcpy((void*)0x20000677, "user_id", 7));
    NONFAILING(*(uint8_t*)0x2000067e = 0x3d);
    NONFAILING(sprintf((char*)0x2000067f, "%020llu", (long long)0));
    NONFAILING(*(uint8_t*)0x20000693 = 0x2c);
    NONFAILING(memcpy((void*)0x20000694, "group_id", 8));
    NONFAILING(*(uint8_t*)0x2000069c = 0x3d);
    NONFAILING(sprintf((char*)0x2000069d, "%020llu", (long long)0));
    NONFAILING(*(uint8_t*)0x200006b1 = 0x2c);
    NONFAILING(memcpy((void*)0x200006b2, "default_permissions", 19));
    NONFAILING(*(uint8_t*)0x200006c5 = 0x2c);
    NONFAILING(*(uint8_t*)0x200006c6 = 0);
    syscall(__NR_mount, 0, 0x20000200, 0x20000300, 0, 0x20000640);
    break;
  case 17:
    syscall(__NR_read, r[1], 0x20001000, 0x1000);
    break;
  case 18:
    NONFAILING(*(uint32_t*)0x20000100 = 0x50);
    NONFAILING(*(uint32_t*)0x20000104 = 0);
    NONFAILING(*(uint64_t*)0x20000108 = 1);
    NONFAILING(*(uint32_t*)0x20000110 = 7);
    NONFAILING(*(uint32_t*)0x20000114 = 0x1b);
    NONFAILING(*(uint32_t*)0x20000118 = 0);
    NONFAILING(*(uint32_t*)0x2000011c = 0);
    NONFAILING(*(uint16_t*)0x20000120 = 0);
    NONFAILING(*(uint16_t*)0x20000122 = 0);
    NONFAILING(*(uint32_t*)0x20000124 = 0);
    NONFAILING(*(uint32_t*)0x20000128 = 0);
    NONFAILING(*(uint32_t*)0x2000012c = 0);
    NONFAILING(*(uint32_t*)0x20000130 = 0);
    NONFAILING(*(uint32_t*)0x20000134 = 0);
    NONFAILING(*(uint32_t*)0x20000138 = 0);
    NONFAILING(*(uint32_t*)0x2000013c = 0);
    NONFAILING(*(uint32_t*)0x20000140 = 0);
    NONFAILING(*(uint32_t*)0x20000144 = 0);
    NONFAILING(*(uint32_t*)0x20000148 = 0);
    NONFAILING(*(uint32_t*)0x2000014c = 0);
    syscall(__NR_write, r[1], 0x20000100, 0x50);
    break;
  case 19:
    NONFAILING(memcpy((void*)0x20000480, "./file0", 8));
    syscall(__NR_stat, 0x20000480, 0x200005c0);
    break;
  case 20:
    syscall(__NR_ioctl, -1, 0x4b4e, 0xf);
    break;
  case 21:
    syscall(__NR_read, r[1], 0x20001000, 0x1000);
    break;
  case 22:
    NONFAILING(*(uint32_t*)0x20002000 = 0x90);
    NONFAILING(*(uint32_t*)0x20002004 = 0);
    NONFAILING(*(uint64_t*)0x20002008 = 2);
    NONFAILING(*(uint64_t*)0x20002010 = 0);
    NONFAILING(*(uint64_t*)0x20002018 = 0);
    NONFAILING(*(uint64_t*)0x20002020 = 0);
    NONFAILING(*(uint64_t*)0x20002028 = 0);
    NONFAILING(*(uint32_t*)0x20002030 = 0);
    NONFAILING(*(uint32_t*)0x20002034 = 0);
    NONFAILING(*(uint64_t*)0x20002038 = 0);
    NONFAILING(*(uint64_t*)0x20002040 = 0);
    NONFAILING(*(uint64_t*)0x20002048 = 0);
    NONFAILING(*(uint64_t*)0x20002050 = 0);
    NONFAILING(*(uint64_t*)0x20002058 = 0);
    NONFAILING(*(uint64_t*)0x20002060 = 0);
    NONFAILING(*(uint32_t*)0x20002068 = 0);
    NONFAILING(*(uint32_t*)0x2000206c = 0);
    NONFAILING(*(uint32_t*)0x20002070 = 0);
    NONFAILING(*(uint32_t*)0x20002074 = 0);
    NONFAILING(*(uint32_t*)0x20002078 = 0);
    NONFAILING(*(uint32_t*)0x2000207c = 0);
    NONFAILING(*(uint32_t*)0x20002080 = 0);
    NONFAILING(*(uint32_t*)0x20002084 = 0);
    NONFAILING(*(uint32_t*)0x20002088 = 0);
    NONFAILING(*(uint32_t*)0x2000208c = 0);
    syscall(__NR_write, r[1], 0x20002000, 0x90);
    break;
  }
}

void execute_one()
{
  execute(23);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        do_sandbox_none();
      }
    }
  }
  sleep(1000000);
  return 0;
}