// https://syzkaller.appspot.com/bug?id=ae28a692910f2e066889b98c890adc67d88a4fda
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.h>

#include <dirent.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.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/endian.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#ifndef SYS_aio_writev
#define SYS_aio_writev 578
#endif
#ifndef SYS_copy_file_range
#define SYS_copy_file_range 569
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (sig == SIGBUS)
    valid = 1;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void reset_flags(const char* filename)
{
  struct stat st;
  if (lstat(filename, &st))
    exit(1);
  st.st_flags &= ~(SF_NOUNLINK | UF_NOUNLINK | SF_IMMUTABLE | UF_IMMUTABLE |
                   SF_APPEND | UF_APPEND);
  if (lchflags(filename, st.st_flags))
    exit(1);
}
static void __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    exit(1);
  }
  struct dirent* ep = 0;
  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);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename)) {
      if (errno == EPERM) {
        reset_flags(filename);
        reset_flags(dir);
        if (unlink(filename) == 0)
          continue;
      }
      exit(1);
    }
  }
  closedir(dp);
  while (rmdir(dir)) {
    if (errno == EPERM) {
      reset_flags(dir);
      if (rmdir(dir) == 0)
        break;
    }
    exit(1);
  }
}

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 = 0;
  for (; 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);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

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

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static void sandbox_common()
{
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

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)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 27; 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);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  setsockopt$inet6_IPV6_HOPOPTS arguments: [
    //    fd: sock_in6 (resource)
    //    level: const = 0x29 (4 bytes)
    //    optname: const = 0x31 (4 bytes)
    //    optval: ptr[inout, array[ANYUNION]] {
    //      array[ANYUNION] {
    //      }
    //    }
    //    optlen: len = 0x28 (8 bytes)
    //  ]
    syscall(SYS_setsockopt, /*fd=*/(intptr_t)-1, /*level=*/0x29,
            /*optname=*/0x31, /*optval=*/0x2000000016c0ul, /*optlen=*/0x28ul);
    break;
  case 1:
    //  kevent arguments: [
    //    kqueue: kqueue (resource)
    //    changelist: ptr[in, array[kevent]] {
    //      array[kevent] {
    //        kevent {
    //          ident: intptr = 0x0 (8 bytes)
    //          filter: filters = 0xfffffffffffffff9 (2 bytes)
    //          flags: evflags = 0x9 (2 bytes)
    //          fflags: fflags = 0x8 (4 bytes)
    //          data: int64 = 0xe8c5 (8 bytes)
    //          udata: intptr = 0x0 (8 bytes)
    //          ext: array[int64] {
    //            int64 = 0x0 (8 bytes)
    //            int64 = 0x0 (8 bytes)
    //            int64 = 0x7 (8 bytes)
    //            int64 = 0x40000000000000 (8 bytes)
    //          }
    //        }
    //      }
    //    }
    //    nchanges: len = 0x1 (8 bytes)
    //    eventlist: nil
    //    nevents: len = 0x0 (8 bytes)
    //    timeout: nil
    //  ]
    NONFAILING(*(uint64_t*)0x200000000040 = 0);
    NONFAILING(*(uint16_t*)0x200000000048 = 0xfff9);
    NONFAILING(*(uint16_t*)0x20000000004a = 9);
    NONFAILING(*(uint32_t*)0x20000000004c = 8);
    NONFAILING(*(uint64_t*)0x200000000050 = 0xe8c5);
    NONFAILING(*(uint64_t*)0x200000000058 = 0);
    NONFAILING(*(uint64_t*)0x200000000060 = 0);
    NONFAILING(*(uint64_t*)0x200000000068 = 0);
    NONFAILING(*(uint64_t*)0x200000000070 = 7);
    NONFAILING(*(uint64_t*)0x200000000078 = 0x40000000000000);
    syscall(SYS_kevent, /*kqueue=*/(intptr_t)-1,
            /*changelist=*/0x200000000040ul, /*nchanges=*/1ul,
            /*eventlist=*/0ul, /*nevents=*/0ul, /*timeout=*/0ul);
    break;
  case 2:
    //  kqueue arguments: [
    //  ]
    //  returns kqueue
    res = syscall(SYS_kqueue);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    //  kevent arguments: [
    //    kqueue: kqueue (resource)
    //    changelist: ptr[in, array[kevent]] {
    //      array[kevent] {
    //        kevent {
    //          ident: intptr = 0x0 (8 bytes)
    //          filter: filters = 0xfffffffffffffff9 (2 bytes)
    //          flags: evflags = 0x9 (2 bytes)
    //          fflags: fflags = 0x8 (4 bytes)
    //          data: int64 = 0xe8c5 (8 bytes)
    //          udata: intptr = 0x0 (8 bytes)
    //          ext: array[int64] {
    //            int64 = 0x0 (8 bytes)
    //            int64 = 0x1 (8 bytes)
    //            int64 = 0x8 (8 bytes)
    //            int64 = 0x9 (8 bytes)
    //          }
    //        }
    //      }
    //    }
    //    nchanges: len = 0x1 (8 bytes)
    //    eventlist: nil
    //    nevents: len = 0x0 (8 bytes)
    //    timeout: nil
    //  ]
    NONFAILING(*(uint64_t*)0x200000000280 = 0);
    NONFAILING(*(uint16_t*)0x200000000288 = 0xfff9);
    NONFAILING(*(uint16_t*)0x20000000028a = 9);
    NONFAILING(*(uint32_t*)0x20000000028c = 8);
    NONFAILING(*(uint64_t*)0x200000000290 = 0xe8c5);
    NONFAILING(*(uint64_t*)0x200000000298 = 0);
    NONFAILING(*(uint64_t*)0x2000000002a0 = 0);
    NONFAILING(*(uint64_t*)0x2000000002a8 = 1);
    NONFAILING(*(uint64_t*)0x2000000002b0 = 8);
    NONFAILING(*(uint64_t*)0x2000000002b8 = 9);
    syscall(SYS_kevent, /*kqueue=*/r[0], /*changelist=*/0x200000000280ul,
            /*nchanges=*/1ul, /*eventlist=*/0ul, /*nevents=*/0ul,
            /*timeout=*/0ul);
    break;
  case 4:
    //  ktimer_create arguments: [
    //    id: clock_id = 0x4 (8 bytes)
    //    evp: nil
    //    timerid: nil
    //  ]
    syscall(SYS_ktimer_create, /*id=CLOCK_MONOTONIC*/ 4ul, /*evp=*/0ul,
            /*timerid=*/0ul);
    break;
  case 5:
    //  cpuset_setaffinity arguments: [
    //    level: cpuset_level = 0x1 (8 bytes)
    //    which: cpuset_which = 0x9 (8 bytes)
    //    id: int64 = 0xa28 (8 bytes)
    //    size: bytesize = 0x8 (8 bytes)
    //    mask: ptr[in, cpuset_mask] {
    //      cpuset_mask {
    //        mask: array[int64] {
    //          int64 = 0x3f6 (8 bytes)
    //        }
    //      }
    //    }
    //  ]
    NONFAILING(*(uint64_t*)0x2000000000c0 = 0x3f6);
    syscall(SYS_cpuset_setaffinity, /*level=CPU_LEVEL_ROOT*/ 1ul,
            /*which=CPU_WHICH_ITHREAD|CPU_WHICH_TID*/ 9ul, /*id=*/0xa28ul,
            /*size=*/8ul, /*mask=*/0x2000000000c0ul);
    break;
  case 6:
    //  open$dir arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    flags: open_flags = 0x40000400000002c2 (8 bytes)
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x200000000240, "./file0\000", 8));
    res = syscall(SYS_open, /*file=*/0x200000000240ul,
                  /*flags=O_SYNC|O_CREAT|FASYNC|O_RDWR|0x4000040000000000*/
                  0x40000400000002c2ul, /*mode=*/0ul);
    if (res != -1)
      r[1] = res;
    break;
  case 7:
    //  freebsd10_pipe arguments: [
    //    pipefd: nil
    //  ]
    syscall(SYS_freebsd10_pipe, /*pipefd=*/0ul);
    break;
  case 8:
    //  cap_rights_limit arguments: [
    //    fd: fd (resource)
    //    rights: nil
    //  ]
    syscall(SYS_cap_rights_limit, /*fd=*/(intptr_t)-1, /*rights=*/0ul);
    break;
  case 9:
    //  kevent arguments: [
    //    kqueue: kqueue (resource)
    //    changelist: ptr[in, array[kevent]] {
    //      array[kevent] {
    //        kevent {
    //          ident: intptr = 0x0 (8 bytes)
    //          filter: filters = 0xfffffffffffffff9 (2 bytes)
    //          flags: evflags = 0x9 (2 bytes)
    //          fflags: fflags = 0x8 (4 bytes)
    //          data: int64 = 0xe8c5 (8 bytes)
    //          udata: intptr = 0x1 (8 bytes)
    //          ext: array[int64] {
    //            int64 = 0x0 (8 bytes)
    //            int64 = 0x0 (8 bytes)
    //            int64 = 0x2 (8 bytes)
    //            int64 = 0x0 (8 bytes)
    //          }
    //        }
    //      }
    //    }
    //    nchanges: len = 0x1 (8 bytes)
    //    eventlist: nil
    //    nevents: len = 0x0 (8 bytes)
    //    timeout: nil
    //  ]
    NONFAILING(*(uint64_t*)0x200000000040 = 0);
    NONFAILING(*(uint16_t*)0x200000000048 = 0xfff9);
    NONFAILING(*(uint16_t*)0x20000000004a = 9);
    NONFAILING(*(uint32_t*)0x20000000004c = 8);
    NONFAILING(*(uint64_t*)0x200000000050 = 0xe8c5);
    NONFAILING(*(uint64_t*)0x200000000058 = 1);
    NONFAILING(*(uint64_t*)0x200000000060 = 0);
    NONFAILING(*(uint64_t*)0x200000000068 = 0);
    NONFAILING(*(uint64_t*)0x200000000070 = 2);
    NONFAILING(*(uint64_t*)0x200000000078 = 0);
    syscall(SYS_kevent, /*kqueue=*/(intptr_t)-1,
            /*changelist=*/0x200000000040ul, /*nchanges=*/1ul,
            /*eventlist=*/0ul, /*nevents=*/0ul, /*timeout=*/0ul);
    break;
  case 10:
    //  ppoll arguments: [
    //    fds: nil
    //    nfds: len = 0x0 (8 bytes)
    //    tsp: nil
    //    sigmask: nil
    //    size: len = 0x0 (8 bytes)
    //  ]
    syscall(SYS_ppoll, /*fds=*/0ul, /*nfds=*/0ul, /*tsp=*/0ul, /*sigmask=*/0ul,
            /*size=*/0ul);
    break;
  case 11:
    //  semop arguments: [
    //    semid: ipc_sem (resource)
    //    ops: nil
    //    nops: len = 0x0 (8 bytes)
    //  ]
    syscall(SYS_semop, /*semid=*/0, /*ops=*/0ul, /*nops=*/0ul);
    break;
  case 12:
    //  aio_writev arguments: [
    //    iocb: ptr[in, aiocb] {
    //      aiocb {
    //        aio_fildes: fd (resource)
    //        pad = 0x0 (4 bytes)
    //        aio_offset: int64 = 0x8 (8 bytes)
    //        aio_buf: nil
    //        aio_nbytes: len = 0x0 (8 bytes)
    //        spare: array[int32] {
    //          int32 = 0x8 (4 bytes)
    //          int32 = 0x1ff (4 bytes)
    //        }
    //        spare2: intptr = 0x1 (8 bytes)
    //        aio_lio_opcode: lio_opcodes = 0x5 (4 bytes)
    //        aio_reqprio: int32 = 0x3 (4 bytes)
    //        aiocb_private: aiocb_private {
    //          status: intptr = 0x24d9339b (8 bytes)
    //          error: intptr = 0x6 (8 bytes)
    //          kernelinfo: nil
    //        }
    //        aio_sigevent: sigevent {
    //          notify: sigev_notify = 0x3 (4 bytes)
    //          signo: int32 = 0x20 (4 bytes)
    //          val: union sigval {
    //            sigval_int: int32 = 0x2 (4 bytes)
    //          }
    //          u: union sigevent_u {
    //            tid: pid (resource)
    //          }
    //        }
    //      }
    //    }
    //  ]
    NONFAILING(*(uint32_t*)0x200000001200 = -1);
    NONFAILING(*(uint64_t*)0x200000001208 = 8);
    NONFAILING(*(uint64_t*)0x200000001210 = 0);
    NONFAILING(*(uint64_t*)0x200000001218 = 0);
    NONFAILING(*(uint32_t*)0x200000001220 = 8);
    NONFAILING(*(uint32_t*)0x200000001224 = 0x1ff);
    NONFAILING(*(uint64_t*)0x200000001228 = 1);
    NONFAILING(*(uint32_t*)0x200000001230 = 5);
    NONFAILING(*(uint32_t*)0x200000001234 = 3);
    NONFAILING(*(uint64_t*)0x200000001238 = 0x24d9339b);
    NONFAILING(*(uint64_t*)0x200000001240 = 6);
    NONFAILING(*(uint64_t*)0x200000001248 = 0);
    NONFAILING(*(uint32_t*)0x200000001250 = 3);
    NONFAILING(*(uint32_t*)0x200000001254 = 0x20);
    NONFAILING(*(uint32_t*)0x200000001258 = 2);
    NONFAILING(*(uint32_t*)0x200000001260 = 0);
    syscall(SYS_aio_writev, /*iocb=*/0x200000001200ul);
    break;
  case 13:
    //  mkdir arguments: [
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x200000000180, "./file0\000", 8));
    syscall(SYS_mkdir, /*path=*/0x200000000180ul, /*mode=*/0ul);
    break;
  case 14:
    //  mkdir arguments: [
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 2f 66 69 6c 65 30 00} (length 0xe)
    //    }
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x200000000000, "./file0/file0\000", 14));
    syscall(SYS_mkdir, /*path=*/0x200000000000ul, /*mode=*/0ul);
    break;
  case 15:
    //  open$dir arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    flags: open_flags = 0x40000400000002c2 (8 bytes)
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x200000000240, "./file0\000", 8));
    res = syscall(SYS_open, /*file=*/0x200000000240ul,
                  /*flags=O_SYNC|O_CREAT|FASYNC|O_RDWR|0x4000040000000000*/
                  0x40000400000002c2ul, /*mode=*/0ul);
    if (res != -1)
      r[2] = res;
    break;
  case 16:
    //  open arguments: [
    //    file: nil
    //    flags: open_flags = 0x615 (8 bytes)
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd
    syscall(SYS_open, /*file=*/0ul,
            /*flags=O_TRUNC|O_NONBLOCK|O_CREAT|O_WRONLY|0x10*/ 0x615ul,
            /*mode=*/0ul);
    break;
  case 17:
    //  open$dir arguments: [
    //    file: nil
    //    flags: open_flags = 0x40000400000002c2 (8 bytes)
    //    mode: open_mode = 0x0 (8 bytes)
    //  ]
    //  returns fd_dir
    res = syscall(SYS_open, /*file=*/0ul,
                  /*flags=O_SYNC|O_CREAT|FASYNC|O_RDWR|0x4000040000000000*/
                  0x40000400000002c2ul, /*mode=*/0ul);
    if (res != -1)
      r[3] = res;
    break;
  case 18:
    //  pwritev arguments: [
    //    fd: fd (resource)
    //    vec: ptr[in, array[iovec_in]] {
    //      array[iovec_in] {
    //        iovec_in {
    //          addr: ptr[in, buffer] {
    //            buffer: {} (length 0x0)
    //          }
    //          len: len = 0x0 (8 bytes)
    //        }
    //      }
    //    }
    //    vlen: len = 0x1 (8 bytes)
    //    off: intptr = 0xb542 (8 bytes)
    //  ]
    NONFAILING(*(uint64_t*)0x2000000000c0 = 0x200000000000);
    NONFAILING(*(uint64_t*)0x2000000000c8 = 0);
    syscall(SYS_pwritev, /*fd=*/r[3], /*vec=*/0x2000000000c0ul, /*vlen=*/1ul,
            /*off=*/0xb542ul);
    break;
  case 19:
    //  lchflags arguments: [
    //    file: nil
    //    flags: chflags_flags = 0x60091 (8 bytes)
    //  ]
    syscall(SYS_lchflags, /*file=*/0ul,
            /*flags=UF_SYSTEM|UF_NOUNLINK|UF_NODUMP|SF_IMMUTABLE|SF_APPEND*/
            0x60091ul);
    break;
  case 20:
    //  copy_file_range arguments: [
    //    infd: fd (resource)
    //    inoffp: nil
    //    outfd: fd (resource)
    //    outoffp: nil
    //    len: int64 = 0x7 (8 bytes)
    //    flags: copy_file_range_flags = 0x0 (8 bytes)
    //  ]
    syscall(SYS_copy_file_range, /*infd=*/r[3], /*inoffp=*/0ul, /*outfd=*/r[2],
            /*outoffp=*/0ul, /*len=*/7ul, /*flags=*/0ul);
    break;
  case 21:
    //  mprotect arguments: [
    //    addr: VMA[0x800000]
    //    len: len = 0x800000 (8 bytes)
    //    prot: mmap_prot = 0x1 (8 bytes)
    //  ]
    syscall(SYS_mprotect, /*addr=*/0x200000000000ul, /*len=*/0x800000ul,
            /*prot=PROT_READ*/ 1ul);
    break;
  case 22:
    //  socket$inet6_udp arguments: [
    //    domain: const = 0x1c (8 bytes)
    //    type: const = 0x2 (8 bytes)
    //    proto: const = 0x0 (1 bytes)
    //  ]
    //  returns sock_udp6
    res = syscall(SYS_socket, /*domain=*/0x1cul, /*type=*/2ul, /*proto=*/0);
    if (res != -1)
      r[4] = res;
    break;
  case 23:
    //  setsockopt$inet6_IPV6_DSTOPTS arguments: [
    //    fd: sock_in6 (resource)
    //    level: const = 0x29 (4 bytes)
    //    optname: const = 0x32 (4 bytes)
    //    optval: ptr[inout, array[ANYUNION]] {
    //      array[ANYUNION] {
    //      }
    //    }
    //    optlen: len = 0x8 (8 bytes)
    //  ]
    syscall(SYS_setsockopt, /*fd=*/r[4], /*level=*/0x29, /*optname=*/0x32,
            /*optval=*/0x200000000300ul, /*optlen=*/8ul);
    break;
  case 24:
    //  getsockopt$inet6_buf arguments: [
    //    fd: sock_in6 (resource)
    //    level: const = 0x29 (4 bytes)
    //    optname: inet6_option_types_buf = 0x32 (4 bytes)
    //    optval: ptr[out, buffer] {
    //      buffer: (DirOut)
    //    }
    //    optlen: ptr[inout, len] {
    //      len = 0x1000 (4 bytes)
    //    }
    //  ]
    NONFAILING(*(uint32_t*)0x200000000000 = 0x1000);
    syscall(SYS_getsockopt, /*fd=*/r[4], /*level=*/0x29,
            /*optname=IPV6_DSTOPTS*/ 0x32, /*optval=*/0x200000001040ul,
            /*optlen=*/0x200000000000ul);
    break;
  case 25:
    //  open$dir arguments: [
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 2f 66 69 6c 65 30 2f 66 69 00} (length
    //      0x11)
    //    }
    //    flags: open_flags = 0x41f00 (8 bytes)
    //    mode: open_mode = 0x80 (8 bytes)
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x200000000080, "./file0/file0/fi\000", 17));
    syscall(SYS_open, /*file=*/0x200000000080ul,
            /*flags=O_EXEC|O_TRUNC|O_NOFOLLOW|O_EXCL|O_CREAT|0x1000*/ 0x41f00ul,
            /*mode=S_IWUSR*/ 0x80ul);
    break;
  case 26:
    //  fcntl$dupfd arguments: [
    //    fd: fd (resource)
    //    cmd: fcntl_dupfd = 0x11 (8 bytes)
    //    arg: fd (resource)
    //  ]
    //  returns fd
    syscall(SYS_fcntl, /*fd=*/r[4], /*cmd=F_DUPFD_CLOEXEC*/ 0x11ul,
            /*arg=*/r[1]);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}