// https://syzkaller.appspot.com/bug?id=eac82c2a59b0d1b499ab4b0611f867ef41e9396b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>
#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#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 (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    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 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 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 {
  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, 1000000);
}

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_ACQUIRE))
      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;
}

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty.  In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//%    claim that you wrote the original software. If you use this software
//%    in a product, an acknowledgment in the product documentation would be
//%    appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//%    misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler    madler@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
  unsigned char* out;
  unsigned long outlen;
  unsigned long outcnt;
  const unsigned char* in;
  unsigned long inlen;
  unsigned long incnt;
  int bitbuf;
  int bitcnt;
  jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need)
{
  long val = s->bitbuf;
  while (s->bitcnt < need) {
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    val |= (long)(s->in[s->incnt++]) << s->bitcnt;
    s->bitcnt += 8;
  }
  s->bitbuf = (int)(val >> need);
  s->bitcnt -= need;
  return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s)
{
  s->bitbuf = 0;
  s->bitcnt = 0;
  if (s->incnt + 4 > s->inlen)
    return 2;
  unsigned len = s->in[s->incnt++];
  len |= s->in[s->incnt++] << 8;
  if (s->in[s->incnt++] != (~len & 0xff) ||
      s->in[s->incnt++] != ((~len >> 8) & 0xff))
    return -2;
  if (s->incnt + len > s->inlen)
    return 2;
  if (s->outcnt + len > s->outlen)
    return 1;
  for (; len--; s->outcnt++, s->incnt++) {
    if (s->in[s->incnt])
      s->out[s->outcnt] = s->in[s->incnt];
  }
  return 0;
}
struct puff_huffman {
  short* count;
  short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h)
{
  int first = 0;
  int index = 0;
  int bitbuf = s->bitbuf;
  int left = s->bitcnt;
  int code = first = index = 0;
  int len = 1;
  short* next = h->count + 1;
  while (1) {
    while (left--) {
      code |= bitbuf & 1;
      bitbuf >>= 1;
      int count = *next++;
      if (code - count < first) {
        s->bitbuf = bitbuf;
        s->bitcnt = (s->bitcnt - len) & 7;
        return h->symbol[index + (code - first)];
      }
      index += count;
      first += count;
      first <<= 1;
      code <<= 1;
      len++;
    }
    left = (MAXBITS + 1) - len;
    if (left == 0)
      break;
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    bitbuf = s->in[s->incnt++];
    if (left > 8)
      left = 8;
  }
  return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n)
{
  int len;
  for (len = 0; len <= MAXBITS; len++)
    h->count[len] = 0;
  int symbol;
  for (symbol = 0; symbol < n; symbol++)
    (h->count[length[symbol]])++;
  if (h->count[0] == n)
    return 0;
  int left = 1;
  for (len = 1; len <= MAXBITS; len++) {
    left <<= 1;
    left -= h->count[len];
    if (left < 0)
      return left;
  }
  short offs[MAXBITS + 1];
  offs[1] = 0;
  for (len = 1; len < MAXBITS; len++)
    offs[len + 1] = offs[len] + h->count[len];
  for (symbol = 0; symbol < n; symbol++)
    if (length[symbol] != 0)
      h->symbol[offs[length[symbol]]++] = symbol;
  return left;
}
static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode,
                      const struct puff_huffman* distcode)
{
  static const short lens[29] = {3,  4,  5,  6,   7,   8,   9,   10,  11, 13,
                                 15, 17, 19, 23,  27,  31,  35,  43,  51, 59,
                                 67, 83, 99, 115, 131, 163, 195, 227, 258};
  static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
                                 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
  static const short dists[30] = {
      1,    2,    3,    4,    5,    7,    9,    13,    17,    25,
      33,   49,   65,   97,   129,  193,  257,  385,   513,   769,
      1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
  static const short dext[30] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                 4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  int symbol;
  do {
    symbol = puff_decode(s, lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 256) {
      if (s->outcnt == s->outlen)
        return 1;
      if (symbol)
        s->out[s->outcnt] = symbol;
      s->outcnt++;
    } else if (symbol > 256) {
      symbol -= 257;
      if (symbol >= 29)
        return -10;
      int len = lens[symbol] + puff_bits(s, lext[symbol]);
      symbol = puff_decode(s, distcode);
      if (symbol < 0)
        return symbol;
      unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
      if (dist > s->outcnt)
        return -11;
      if (s->outcnt + len > s->outlen)
        return 1;
      while (len--) {
        if (dist <= s->outcnt && s->out[s->outcnt - dist])
          s->out[s->outcnt] = s->out[s->outcnt - dist];
        s->outcnt++;
      }
    }
  } while (symbol != 256);
  return 0;
}
static int puff_fixed(struct puff_state* s)
{
  static int virgin = 1;
  static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
  static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  static struct puff_huffman lencode, distcode;
  if (virgin) {
    lencode.count = lencnt;
    lencode.symbol = lensym;
    distcode.count = distcnt;
    distcode.symbol = distsym;
    short lengths[FIXLCODES];
    int symbol;
    for (symbol = 0; symbol < 144; symbol++)
      lengths[symbol] = 8;
    for (; symbol < 256; symbol++)
      lengths[symbol] = 9;
    for (; symbol < 280; symbol++)
      lengths[symbol] = 7;
    for (; symbol < FIXLCODES; symbol++)
      lengths[symbol] = 8;
    puff_construct(&lencode, lengths, FIXLCODES);
    for (symbol = 0; symbol < MAXDCODES; symbol++)
      lengths[symbol] = 5;
    puff_construct(&distcode, lengths, MAXDCODES);
    virgin = 0;
  }
  return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s)
{
  static const short order[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
                                  11, 4,  12, 3, 13, 2, 14, 1, 15};
  int nlen = puff_bits(s, 5) + 257;
  int ndist = puff_bits(s, 5) + 1;
  int ncode = puff_bits(s, 4) + 4;
  if (nlen > MAXLCODES || ndist > MAXDCODES)
    return -3;
  short lengths[MAXCODES];
  int index;
  for (index = 0; index < ncode; index++)
    lengths[order[index]] = puff_bits(s, 3);
  for (; index < 19; index++)
    lengths[order[index]] = 0;
  short lencnt[MAXBITS + 1], lensym[MAXLCODES];
  struct puff_huffman lencode = {lencnt, lensym};
  int err = puff_construct(&lencode, lengths, 19);
  if (err != 0)
    return -4;
  index = 0;
  while (index < nlen + ndist) {
    int symbol;
    int len;
    symbol = puff_decode(s, &lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 16)
      lengths[index++] = symbol;
    else {
      len = 0;
      if (symbol == 16) {
        if (index == 0)
          return -5;
        len = lengths[index - 1];
        symbol = 3 + puff_bits(s, 2);
      } else if (symbol == 17)
        symbol = 3 + puff_bits(s, 3);
      else
        symbol = 11 + puff_bits(s, 7);
      if (index + symbol > nlen + ndist)
        return -6;
      while (symbol--)
        lengths[index++] = len;
    }
  }
  if (lengths[256] == 0)
    return -9;
  err = puff_construct(&lencode, lengths, nlen);
  if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
    return -7;
  short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  struct puff_huffman distcode = {distcnt, distsym};
  err = puff_construct(&distcode, lengths + nlen, ndist);
  if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
    return -8;
  return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest, unsigned long* destlen,
                const unsigned char* source, unsigned long sourcelen)
{
  struct puff_state s = {
      .out = dest,
      .outlen = *destlen,
      .outcnt = 0,
      .in = source,
      .inlen = sourcelen,
      .incnt = 0,
      .bitbuf = 0,
      .bitcnt = 0,
  };
  int err;
  if (setjmp(s.env) != 0)
    err = 2;
  else {
    int last;
    do {
      last = puff_bits(&s, 1);
      int type = puff_bits(&s, 2);
      err = type == 0 ? puff_stored(&s)
                      : (type == 1 ? puff_fixed(&s)
                                   : (type == 2 ? puff_dynamic(&s) : -1));
      if (err != 0)
        break;
    } while (!last);
  }
  *destlen = s.outcnt;
  return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
                             unsigned long sourcelen, int dest_fd)
{
  if (sourcelen < ZLIB_HEADER_WIDTH)
    return 0;
  source += ZLIB_HEADER_WIDTH;
  sourcelen -= ZLIB_HEADER_WIDTH;
  const unsigned long max_destlen = 132 << 20;
  void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
                   MAP_PRIVATE | MAP_ANON, -1, 0);
  if (ret == MAP_FAILED)
    return -1;
  unsigned char* dest = (unsigned char*)ret;
  unsigned long destlen = max_destlen;
  int err = puff(dest, &destlen, source, sourcelen);
  if (err) {
    munmap(dest, max_destlen);
    errno = -err;
    return -1;
  }
  if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
    munmap(dest, max_destlen);
    return -1;
  }
  return munmap(dest, max_destlen);
}

static int setup_loop_device(unsigned char* data, unsigned long size,
                             const char* loopname, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (puff_zlib_to_file(data, size, memfd)) {
    err = errno;
    goto error_close_memfd;
  }
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  close(memfd);
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static void reset_loop_device(const char* loopname)
{
  int loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    return;
  }
  if (ioctl(loopfd, LOOP_CLR_FD, 0)) {
  }
  close(loopfd);
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile long flags, volatile long optsarg,
                            volatile long change_dir,
                            volatile unsigned long size, volatile long image)
{
  unsigned char* data = (unsigned char*)image;
  int res = -1, err = 0, need_loop_device = !!size;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    int loopfd;
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(data, size, loopname, &loopfd) == -1)
      return -1;
    close(loopfd);
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    bool has_remount_ro = false;
    char* remount_ro_start = strstr(opts, "errors=remount-ro");
    if (remount_ro_start != NULL) {
      char after = *(remount_ro_start + strlen("errors=remount-ro"));
      char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1);
      has_remount_ro = ((before == '\0' || before == ',') &&
                        (after == '\0' || after == ','));
    }
    if (strstr(opts, "errors=panic") || !has_remount_ro)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  } else if (strncmp(fs, "gfs2", 4) == 0 &&
             (strstr(opts, "errors=panic") || strstr(opts, "debug"))) {
    strcat(opts, ",errors=withdraw");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  if (change_dir) {
    res = chdir(target);
    if (res == -1) {
      err = errno;
    }
  }

error_clear_loop:
  if (need_loop_device)
    reset_loop_device(loopname);
  errno = err;
  return res;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
  const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW;

retry:
  while (umount2(dir, umount_flags) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    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);
    while (umount2(filename, umount_flags) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, umount_flags))
        exit(1);
    }
  }
  closedir(dp);
  for (int i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, umount_flags))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int 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 reset_loop()
{
  char buf[64];
  snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
  int loopfd = open(buf, O_RDWR);
  if (loopfd != -1) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
  }
}

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

static void setup_sysctl()
{
  int cad_pid = fork();
  if (cad_pid < 0)
    exit(1);
  if (cad_pid == 0) {
    for (;;)
      sleep(100);
  }
  char tmppid[32];
  snprintf(tmppid, sizeof(tmppid), "%d", cad_pid);
  struct {
    const char* name;
    const char* data;
  } files[] = {
      {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"},
      {"/proc/sys/kernel/hung_task_check_interval_secs", "20"},
      {"/proc/sys/net/core/bpf_jit_kallsyms", "1"},
      {"/proc/sys/net/core/bpf_jit_harden", "0"},
      {"/proc/sys/kernel/kptr_restrict", "0"},
      {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"},
      {"/proc/sys/fs/mount-max", "100"},
      {"/proc/sys/vm/oom_dump_tasks", "0"},
      {"/proc/sys/debug/exception-trace", "0"},
      {"/proc/sys/kernel/printk", "7 4 1 3"},
      {"/proc/sys/kernel/keys/gc_delay", "1"},
      {"/proc/sys/vm/oom_kill_allocating_task", "1"},
      {"/proc/sys/kernel/ctrl-alt-del", "0"},
      {"/proc/sys/kernel/cad_pid", tmppid},
  };
  for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].name, files[i].data)) {
    }
  }
  kill(cad_pid, SIGKILL);
  while (waitpid(cad_pid, NULL, 0) != cad_pid)
    ;
}

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 < 8; 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 + (call == 1 ? 4000 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      setup_test();
      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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  ioctl$sock_SIOCGIFINDEX arguments: [
    //    fd: sock (resource)
    //    cmd: const = 0x8933 (4 bytes)
    //    arg: nil
    //  ]
    syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0x8933, /*arg=*/0ul);
    break;
  case 1:
    //  syz_mount_image$ext4 arguments: [
    //    fs: ptr[in, buffer] {
    //      buffer: {65 78 74 34 00} (length 0x5)
    //    }
    //    dir: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
    //    }
    //    flags: mount_flags = 0x18 (8 bytes)
    //    opts: ptr[in, fs_options[ext4_options]] {
    //      fs_options[ext4_options] {
    //        elems: array[fs_opt_elem[ext4_options]] {
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              delalloc: buffer: {64 65 6c 61 6c 6c 6f 63} (length 0x8)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              data_err_abort: buffer: {64 61 74 61 5f 65 72 72 3d 61 62 6f
    //              72 74} (length 0xe)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              barrier_val: fs_opt["barrier", fmt[hex, int32]] {
    //                name: buffer: {62 61 72 72 69 65 72} (length 0x7)
    //                eq: const = 0x3d (1 bytes)
    //                val: int32 = 0x3 (18 bytes)
    //              }
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              bsddf: buffer: {62 73 64 64 66} (length 0x5)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              bh: buffer: {62 68} (length 0x2)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              oldalloc: buffer: {6f 6c 64 61 6c 6c 6f 63} (length 0x8)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              data_err_ignore: buffer: {64 61 74 61 5f 65 72 72 3d 69 67
    //              6e 6f 72 65} (length 0xf)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              nouid32: buffer: {6e 6f 75 69 64 33 32} (length 0x7)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              nobh: buffer: {6e 6f 62 68} (length 0x4)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              user_xattr: buffer: {75 73 65 72 5f 78 61 74 74 72} (length
    //              0xa)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              nouid32: buffer: {6e 6f 75 69 64 33 32} (length 0x7)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              dioread_nolock: buffer: {64 69 6f 72 65 61 64 5f 6e 6f 6c 6f
    //              63 6b} (length 0xe)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //        }
    //        common: array[fs_opt_elem[fs_options_common]] {
    //        }
    //        null: const = 0x0 (1 bytes)
    //      }
    //    }
    //    chdir: int8 = 0x1 (1 bytes)
    //    size: len = 0x55e (8 bytes)
    //    img: ptr[in, buffer] {
    //      buffer: (compressed buffer with length 0x55e)
    //    }
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x200000000140, "ext4\000", 5));
    NONFAILING(memcpy((void*)0x200000000000, "./file1\000", 8));
    NONFAILING(memcpy((void*)0x200000000580, "delalloc", 8));
    NONFAILING(*(uint8_t*)0x200000000588 = 0x2c);
    NONFAILING(memcpy((void*)0x200000000589, "data_err=abort", 14));
    NONFAILING(*(uint8_t*)0x200000000597 = 0x2c);
    NONFAILING(memcpy((void*)0x200000000598, "barrier", 7));
    NONFAILING(*(uint8_t*)0x20000000059f = 0x3d);
    NONFAILING(sprintf((char*)0x2000000005a0, "0x%016llx", (long long)3));
    NONFAILING(*(uint8_t*)0x2000000005b2 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005b3, "bsddf", 5));
    NONFAILING(*(uint8_t*)0x2000000005b8 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005b9, "bh", 2));
    NONFAILING(*(uint8_t*)0x2000000005bb = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005bc, "oldalloc", 8));
    NONFAILING(*(uint8_t*)0x2000000005c4 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005c5, "data_err=ignore", 15));
    NONFAILING(*(uint8_t*)0x2000000005d4 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005d5, "nouid32", 7));
    NONFAILING(*(uint8_t*)0x2000000005dc = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005dd, "nobh", 4));
    NONFAILING(*(uint8_t*)0x2000000005e1 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005e2, "user_xattr", 10));
    NONFAILING(*(uint8_t*)0x2000000005ec = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005ed, "nouid32", 7));
    NONFAILING(*(uint8_t*)0x2000000005f4 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000005f5, "dioread_nolock", 14));
    NONFAILING(*(uint8_t*)0x200000000603 = 0x2c);
    NONFAILING(*(uint8_t*)0x200000000604 = 0);
    NONFAILING(memcpy(
        (void*)0x200000001bc0,
        "\x78\x9c\xec\xdd\xdf\x6b\x5b\xe5\x1b\x00\xf0\xe7\xa4\xcd\x7e\x7f\xbf"
        "\xeb\x60\x0c\x15\x91\xc2\x2e\x9c\xcc\xa5\x6b\xeb\x8f\x09\x5e\xcc\x4b"
        "\xd1\xe1\x40\xef\x67\x68\xcf\xca\x68\xba\x8c\x26\x1d\x6b\x1d\xb8\x5d"
        "\xb8\x1b\x6f\x64\x08\x22\x0e\xc4\x7b\xbd\xf7\x4a\x86\xff\x80\x7f\xc5"
        "\x40\x07\x43\x46\xd1\x0b\x6f\x2a\x27\x3d\x69\xbb\x35\x69\xd2\x2e\x5b"
        "\x3a\xf3\xf9\xc0\xd9\xde\x37\xe7\x24\xef\x79\x72\xce\xf3\xf6\x7d\x73"
        "\x4e\x48\x00\x03\x6b\x34\xfb\xa7\x10\xf1\x62\x44\x7c\x95\x44\x1c\x8e"
        "\x88\x24\x5f\x37\x1c\xf9\xca\xd1\xd5\xed\x96\x1f\x5e\x9f\xca\x96\x24"
        "\x56\x56\x3e\xfe\x33\x69\x6c\x97\xd5\x9b\xaf\xd5\x7c\xde\xc1\xbc\xf2"
        "\x42\x44\xfc\xfa\x45\xc4\xc9\xc2\xe6\x76\x6b\x8b\x4b\xb3\xe5\x4a\x25"
        "\x9d\xcf\xeb\x63\xf5\xb9\x2b\x63\xb5\xc5\xa5\x53\x97\xe6\xca\x33\xe9"
        "\x4c\x7a\x79\x62\x72\xf2\xcc\x9b\x93\x13\xef\xbc\xfd\x56\xcf\x62\x7d"
        "\xed\xfc\xdf\xdf\x7e\x74\xf7\xfd\x33\x5f\x1e\x5f\xfe\xe6\xa7\xfb\x47"
        "\x6e\x27\x71\x36\x0e\xe5\xeb\x36\xc6\xf1\x04\x6e\x6c\xac\x8c\xc6\x68"
        "\xfe\x9e\x14\xe3\xec\x63\x1b\x8e\xaf\xfe\xd7\x8b\x36\x77\x85\xa4\xdf"
        "\x3b\xc0\x8e\x0c\xe5\x79\x5e\x8c\xac\x0f\x38\x1c\x43\x79\xd6\x03\xff"
        "\x7d\x9f\x47\xc4\x0a\x30\xa0\x12\xf9\x0f\x03\xaa\x39\x0e\x68\xce\xed"
        "\x7b\x34\x0f\x7e\x6e\x3c\x78\x6f\x75\x02\xb4\x39\xfe\xe1\xd5\xcf\x46"
        "\x62\x5f\x63\x6e\x74\x60\x39\x79\x64\x66\x94\xcd\x77\x47\x7a\xd0\x7e"
        "\xd6\xc6\xcf\x7f\xdc\xb9\x9d\x2d\xd1\xbb\xcf\x21\x00\x3a\xba\x71\x33"
        "\x22\x4e\x0f\x0f\x6f\xee\xff\x92\xbc\xff\xdb\xb9\xd3\x5d\x6c\xf3\x78"
        "\x1b\xfa\x3f\x78\x76\xee\x66\xe3\x9f\xd7\x5b\x8d\x7f\x0a\x6b\xe3\x9f"
        "\x68\x31\xfe\x39\xd8\x22\x77\x77\xa2\x73\xfe\x17\xee\xf7\xa0\x99\xb6"
        "\xb2\xf1\xdf\xbb\x2d\xc7\xbf\x6b\x17\xad\x46\x86\xf2\xda\xff\x1a\x63"
        "\xbe\x62\x72\xf1\x52\x25\xcd\xfa\xb6\xff\x47\xc4\x89\x28\xee\xcd\xea"
        "\xe3\x5b\xb4\x71\x66\xf9\xde\x4a\xbb\x75\x1b\xc7\x7f\xd9\x92\xb5\xdf"
        "\x1c\x0b\xe6\xfb\x71\x7f\x78\xef\xa3\xcf\x99\x2e\xd7\xcb\x4f\x12\xf3"
        "\x46\x0f\x6e\x46\xbc\xd4\x72\xfc\x9b\xac\x1d\xff\xa4\xc5\xf1\xcf\xde"
        "\x8f\xf3\x5d\xb6\x71\x2c\xbd\xf3\x4a\xbb\x75\x9d\xe3\x7f\xba\x56\x7e"
        "\x88\x78\xb5\xe5\xf1\x5f\xbf\xa2\x95\x6c\x7d\x7d\x72\xac\x71\x3e\x8c"
        "\x35\xcf\x8a\xcd\xfe\xba\x75\xec\xb7\x76\xed\xf7\x3b\xfe\xec\xf8\x1f"
        "\xd8\x3a\xfe\x91\x64\xe3\xf5\xda\xda\xf6\xdb\xf8\x7e\xdf\x3f\x69\xbb"
        "\x75\x8f\xc4\x1f\xdd\x9f\xff\x7b\x92\x4f\x1a\xe5\x3d\xf9\x63\xd7\xca"
        "\xf5\xfa\xfc\x78\xc4\x9e\xe4\xc3\xcd\x8f\x4f\xac\x3f\xb7\x59\x6f\x6e"
        "\x9f\xc5\x7f\xe2\xf8\xd6\xfd\xdf\xfa\xf9\xff\xcb\xda\xeb\xec\x8f\x88"
        "\x4f\xbb\x8c\xff\xd6\xd1\x1f\x5f\xde\xd7\x4d\xfc\x7d\x3a\xfe\xd3\xdb"
        "\x3a\xfe\xdb\x2f\xdc\xfb\xe0\xb3\xef\xda\xb5\xdf\x5d\xff\xf7\x46\xa3"
        "\x74\x22\x7f\xa4\x9b\xfe\xaf\xc3\x7e\x15\x63\xc7\x67\x33\x00\x00\x00"
        "\x00\x00\x00\xec\x5e\x85\x88\x38\x14\x49\xa1\xb4\x56\x2e\x14\x4a\xa5"
        "\xd5\xfb\x3b\x8e\xc6\x81\x42\xa5\x5a\xab\x9f\xbc\x58\x5d\xb8\x3c\x1d"
        "\x8d\xef\xca\x8e\x44\xb1\xd0\xbc\xd2\x7d\x78\xc3\xfd\x10\xe3\xf9\xfd"
        "\xb0\xcd\xfa\xc4\x63\xf5\xc9\x88\x38\x12\x11\x5f\x0f\xed\x6f\xd4\x4b"
        "\x53\xd5\xca\x74\xbf\x83\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x80\x5d\xe2\x60\x9b\xef\xff\x67\x7e\x1f\xea\xf7\xde"
        "\x01\x4f\x9d\x9f\xfc\x86\xc1\xd5\x31\xff\x7b\xf1\x4b\x4f\xc0\xae\xe4"
        "\xef\x3f\x0c\x2e\xf9\x0f\x83\x4b\xfe\xc3\xe0\x92\xff\x30\xb8\xe4\x3f"
        "\x0c\x2e\xf9\x0f\x83\x4b\xfe\xc3\xe0\x92\xff\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd0\x53"
        "\xe7\xcf\x9d\xcb\x96\x95\xe5\x87\xd7\xa7\xb2\xfa\xf4\xd5\xc5\x85\xd9"
        "\xea\xd5\x53\xd3\x69\x6d\xb6\x34\xb7\x30\x55\x9a\xaa\xce\x5f\x29\xcd"
        "\x54\xab\x33\x95\xb4\x34\x55\x9d\xeb\xf4\x7a\x95\x6a\xf5\xca\xf8\x44"
        "\x2c\x5c\x1b\xab\xa7\xb5\xfa\x58\x6d\x71\xe9\xc2\x5c\x75\xe1\x72\xfd"
        "\xc2\xa5\xb9\xf2\x4c\x7a\x21\x2d\x3e\x93\xa8\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\xf9\x52\x5b\x5c\x9a\x2d\x57"
        "\x2a\xe9\xbc\x82\xc2\x8e\x0a\xc3\xbb\x63\x37\x14\x7a\x5c\xe8\x77\xcf"
        "\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\xeb\xfe\x0d\x00\x00\xff\xff\x0a\xa3\x37\xec",
        1374));
    NONFAILING(syz_mount_image(/*fs=*/0x200000000140, /*dir=*/0x200000000000,
                               /*flags=MS_SYNCHRONOUS|MS_NOEXEC*/ 0x18,
                               /*opts=*/0x200000000580, /*chdir=*/1,
                               /*size=*/0x55e, /*img=*/0x200000001bc0));
    break;
  case 2:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 62 75 73 00} (length 0x6)
    //    }
    //    flags: open_flags = 0x20240 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    NONFAILING(memcpy((void*)0x200000000400, "./bus\000", 6));
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000400ul,
                  /*flags=O_TRUNC|O_NOFOLLOW|O_CREAT*/ 0x20240, /*mode=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 3:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 62 75 73 00} (length 0x6)
    //    }
    //    flags: open_flags = 0x1c1182 (4 bytes)
    //    mode: open_mode = 0x9b (2 bytes)
    //  ]
    //  returns fd
    NONFAILING(memcpy((void*)0x200000004400, "./bus\000", 6));
    res = syscall(
        __NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000004400ul,
        /*flags=O_SYNC|O_NOCTTY|O_NOATIME|O_EXCL|O_CLOEXEC|0x2*/ 0x1c1182,
        /*mode=S_IXOTH|S_IWOTH|S_IXGRP|S_IWGRP|S_IWUSR*/ 0x9b);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
    //    }
    //    flags: open_flags = 0x42 (4 bytes)
    //    mode: open_mode = 0x0 (2 bytes)
    //  ]
    //  returns fd
    NONFAILING(memcpy((void*)0x200000000040, "./file1\000", 8));
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000040ul,
                  /*flags=O_CREAT|O_RDWR*/ 0x42, /*mode=*/0);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    //  pwrite64 arguments: [
    //    fd: fd (resource)
    //    buf: ptr[in, buffer] {
    //      buffer: {61} (length 0x1)
    //    }
    //    count: len = 0x200000c1 (8 bytes)
    //    pos: intptr = 0x9000 (8 bytes)
    //  ]
    NONFAILING(memset((void*)0x2000000000c0, 97, 1));
    syscall(__NR_pwrite64, /*fd=*/r[2], /*buf=*/0x2000000000c0ul,
            /*count=*/0x200000c1ul, /*pos=*/0x9000ul);
    break;
  case 6:
    //  write$binfmt_aout arguments: [
    //    fd: fd_binfmt (resource)
    //    data: ptr[inout, array[ANYUNION]] {
    //      array[ANYUNION] {
    //      }
    //    }
    //    len: bytesize = 0x720 (8 bytes)
    //  ]
    syscall(__NR_write, /*fd=*/r[1], /*data=*/0x200000000d00ul,
            /*len=*/0x720ul);
    break;
  case 7:
    //  sendfile arguments: [
    //    fdout: fd (resource)
    //    fdin: fd (resource)
    //    off: nil
    //    count: intptr = 0x7ffff000 (8 bytes)
    //  ]
    syscall(__NR_sendfile, /*fdout=*/r[1], /*fdin=*/r[0], /*off=*/0ul,
            /*count=*/0x7ffff000ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  setup_sysctl();
  const char* reason;
  (void)reason;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}