// https://syzkaller.appspot.com/bug?id=6bab3199225feb0723bd5bb17f61c4e2685df632
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <pthread.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/capability.h>
#include <linux/futex.h>
#include <linux/net.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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 void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i;
  for (i = 0; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

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;
}

#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;
    }
    exit(1);
  }
  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;
      }
      exit(1);
    }
    if (table->info.size > sizeof(table->replace.entrytable))
      exit(1);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      exit(1);
    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))
      exit(1);
    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;
    }
    exit(1);
  }
  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))
      exit(1);
    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))
        exit(1);
      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))
      exit(1);
  }
  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;
    }
    exit(1);
  }
  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;
      }
      exit(1);
    }
    if (table->info.size > sizeof(table->replace.entrytable))
      exit(1);
    if (table->info.num_entries > XT_MAX_ENTRIES)
      exit(1);
    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))
      exit(1);
    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;
    }
    exit(1);
  }
  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))
      exit(1);
    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))
        exit(1);
      if (memcmp(table->replace.entrytable, entries.entrytable,
                 table->info.size) == 0)
        continue;
    } else {
    }
    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))
      exit(1);
  }
  close(fd);
}

#define NF_BR_NUMHOOKS 6
#define EBT_TABLE_MAXNAMELEN 32
#define EBT_CHAIN_MAXNAMELEN 32
#define EBT_BASE_CTL 128
#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
#define EBT_SO_GET_INFO (EBT_BASE_CTL)
#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO + 1)
#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES + 1)
#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO + 1)

struct ebt_replace {
  char name[EBT_TABLE_MAXNAMELEN];
  unsigned int valid_hooks;
  unsigned int nentries;
  unsigned int entries_size;
  struct ebt_entries* hook_entry[NF_BR_NUMHOOKS];
  unsigned int num_counters;
  struct ebt_counter* counters;
  char* entries;
};

struct ebt_entries {
  unsigned int distinguisher;
  char name[EBT_CHAIN_MAXNAMELEN];
  unsigned int counter_offset;
  int policy;
  unsigned int nentries;
  char data[0] __attribute__((aligned(__alignof__(struct ebt_replace))));
};

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;
    }
    exit(1);
  }
  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;
      }
      exit(1);
    }
    if (table->replace.entries_size > sizeof(table->entrytable))
      exit(1);
    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))
      exit(1);
  }
  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;
    }
    exit(1);
  }
  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))
      exit(1);
    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))
        exit(1);
      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))
      exit(1);
  }
  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 setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

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 = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static void drop_caps(void)
{
  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    exit(1);
  const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
  cap_data[0].effective &= ~drop;
  cap_data[0].permitted &= ~drop;
  cap_data[0].inheritable &= ~drop;
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    exit(1);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  drop_caps();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  exit(1);
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_loop()
{
  checkpoint_net_namespace();
}

static void reset_loop()
{
  reset_net_namespace();
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void close_fds()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

static void setup_binfmt_misc()
{
  if (mount(0, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, 0)) {
  }
  write_file("/proc/sys/fs/binfmt_misc/register", ":syz0:M:0:\x01::./file0:");
  write_file("/proc/sys/fs/binfmt_misc/register",
             ":syz1:M:1:\x02::./file0:POC");
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 3; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  close_fds();
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  setup_loop();
  int iter;
  for (iter = 0;; iter++) {
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    NONFAILING(*(uint32_t*)0x20000000 = 2);
    NONFAILING(*(uint32_t*)0x20000004 = 0x70);
    NONFAILING(*(uint8_t*)0x20000008 = 0x65);
    NONFAILING(*(uint8_t*)0x20000009 = 0);
    NONFAILING(*(uint8_t*)0x2000000a = 0);
    NONFAILING(*(uint8_t*)0x2000000b = 0);
    NONFAILING(*(uint32_t*)0x2000000c = 0);
    NONFAILING(*(uint64_t*)0x20000010 = 0);
    NONFAILING(*(uint64_t*)0x20000018 = 0);
    NONFAILING(*(uint64_t*)0x20000020 = 0);
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 1, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 2, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 3, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 4, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 5, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 6, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 7, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 8, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 9, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 10, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 11, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 12, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 13, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 14, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 15, 2));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 17, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 18, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 19, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 20, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 21, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 22, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 23, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 24, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 25, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 26, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 27, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 28, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 29, 35));
    NONFAILING(*(uint32_t*)0x20000030 = 0);
    NONFAILING(*(uint32_t*)0x20000034 = 0);
    NONFAILING(*(uint64_t*)0x20000038 = 0);
    NONFAILING(*(uint64_t*)0x20000040 = 0);
    NONFAILING(*(uint64_t*)0x20000048 = 0);
    NONFAILING(*(uint64_t*)0x20000050 = 0);
    NONFAILING(*(uint32_t*)0x20000058 = 0);
    NONFAILING(*(uint32_t*)0x2000005c = 0);
    NONFAILING(*(uint64_t*)0x20000060 = 0);
    NONFAILING(*(uint32_t*)0x20000068 = 0);
    NONFAILING(*(uint16_t*)0x2000006c = 0);
    NONFAILING(*(uint16_t*)0x2000006e = 0);
    res = syscall(__NR_perf_event_open, 0x20000000, -1, 0, -1, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x20000200 = 7);
    NONFAILING(*(uint32_t*)0x20000204 = 0x70);
    NONFAILING(*(uint8_t*)0x20000208 = 4);
    NONFAILING(*(uint8_t*)0x20000209 = 0);
    NONFAILING(*(uint8_t*)0x2000020a = 0);
    NONFAILING(*(uint8_t*)0x2000020b = 0);
    NONFAILING(*(uint32_t*)0x2000020c = 0);
    NONFAILING(*(uint64_t*)0x20000210 = 0);
    NONFAILING(*(uint64_t*)0x20000218 = 0);
    NONFAILING(*(uint64_t*)0x20000220 = 0);
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 1, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 2, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 3, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 4, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 5, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 6, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 7, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 8, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 9, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 10, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 11, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 12, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 13, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 14, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 15, 2));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 17, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 18, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 19, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 20, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 21, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 22, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 23, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 24, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 25, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 26, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 27, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 28, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000228, 0, 29, 35));
    NONFAILING(*(uint32_t*)0x20000230 = 0);
    NONFAILING(*(uint32_t*)0x20000234 = 0);
    NONFAILING(*(uint64_t*)0x20000238 = 0);
    NONFAILING(*(uint64_t*)0x20000240 = 0);
    NONFAILING(*(uint64_t*)0x20000248 = 0);
    NONFAILING(*(uint64_t*)0x20000250 = 0);
    NONFAILING(*(uint32_t*)0x20000258 = 0);
    NONFAILING(*(uint32_t*)0x2000025c = 0);
    NONFAILING(*(uint64_t*)0x20000260 = 0);
    NONFAILING(*(uint32_t*)0x20000268 = 0);
    NONFAILING(*(uint16_t*)0x2000026c = 0);
    NONFAILING(*(uint16_t*)0x2000026e = 0);
    syscall(__NR_perf_event_open, 0x20000200, -1, 0, r[0], 0);
    break;
  case 2:
    NONFAILING(*(uint32_t*)0x20000000 = 2);
    NONFAILING(*(uint32_t*)0x20000004 = 0x70);
    NONFAILING(*(uint8_t*)0x20000008 = 0x65);
    NONFAILING(*(uint8_t*)0x20000009 = 0);
    NONFAILING(*(uint8_t*)0x2000000a = 0);
    NONFAILING(*(uint8_t*)0x2000000b = 0);
    NONFAILING(*(uint32_t*)0x2000000c = 0);
    NONFAILING(*(uint64_t*)0x20000010 = 0);
    NONFAILING(*(uint64_t*)0x20000018 = 0);
    NONFAILING(*(uint64_t*)0x20000020 = 0);
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 0, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 1, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 2, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 3, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 4, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 5, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 6, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 7, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 8, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 9, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 10, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 11, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 12, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 13, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 14, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 15, 2));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 17, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 18, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 19, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 20, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 21, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 22, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 23, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 24, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 25, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 26, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 27, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 28, 1));
    NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000028, 0, 29, 35));
    NONFAILING(*(uint32_t*)0x20000030 = 0);
    NONFAILING(*(uint32_t*)0x20000034 = 0);
    NONFAILING(*(uint64_t*)0x20000038 = 0);
    NONFAILING(*(uint64_t*)0x20000040 = 0);
    NONFAILING(*(uint64_t*)0x20000048 = 0);
    NONFAILING(*(uint64_t*)0x20000050 = 0);
    NONFAILING(*(uint32_t*)0x20000058 = 0);
    NONFAILING(*(uint32_t*)0x2000005c = 0);
    NONFAILING(*(uint64_t*)0x20000060 = 0);
    NONFAILING(*(uint32_t*)0x20000068 = 0);
    NONFAILING(*(uint16_t*)0x2000006c = 0);
    NONFAILING(*(uint16_t*)0x2000006e = 0);
    syscall(__NR_perf_event_open, 0x20000000, -1, 0, r[0], 0);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  setup_binfmt_misc();
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}