// https://syzkaller.appspot.com/bug?id=5571b2ddea330545c7cd6a7ca94a5d4861780217
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#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/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 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;
}

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 loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; 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 == 0 ? 4000 : 0));
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    //  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 = 0x1000040 (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 {
    //              barrier: buffer: {62 61 72 72 69 65 72} (length 0x7)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              nodioread_nolock: buffer: {6e 6f 64 69 6f 72 65 61 64 5f 6e
    //              6f 6c 6f 63 6b} (length 0x10)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              noquota: buffer: {6e 6f 71 75 6f 74 61} (length 0x7)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              barrier: buffer: {62 61 72 72 69 65 72} (length 0x7)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              auto_da_alloc: buffer: {61 75 74 6f 5f 64 61 5f 61 6c 6c 6f
    //              63} (length 0xd)
    //            }
    //            comma: const = 0x2c (1 bytes)
    //          }
    //          fs_opt_elem[ext4_options] {
    //            elem: union ext4_options {
    //              nodioread_nolock: buffer: {6e 6f 64 69 6f 72 65 61 64 5f 6e
    //              6f 6c 6f 63 6b} (length 0x10)
    //            }
    //            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 = 0x59c (8 bytes)
    //    img: ptr[in, buffer] {
    //      buffer: (compressed buffer with length 0x59c)
    //    }
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x2000000000c0, "ext4\000", 5));
    NONFAILING(memcpy((void*)0x200000000000, "./file1\000", 8));
    NONFAILING(memcpy((void*)0x2000000002c0, "barrier", 7));
    NONFAILING(*(uint8_t*)0x2000000002c7 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000002c8, "nodioread_nolock", 16));
    NONFAILING(*(uint8_t*)0x2000000002d8 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000002d9, "noquota", 7));
    NONFAILING(*(uint8_t*)0x2000000002e0 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000002e1, "barrier", 7));
    NONFAILING(*(uint8_t*)0x2000000002e8 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000002e9, "auto_da_alloc", 13));
    NONFAILING(*(uint8_t*)0x2000000002f6 = 0x2c);
    NONFAILING(memcpy((void*)0x2000000002f7, "nodioread_nolock", 16));
    NONFAILING(*(uint8_t*)0x200000000307 = 0x2c);
    NONFAILING(*(uint8_t*)0x200000000308 = 0);
    NONFAILING(memcpy(
        (void*)0x200000001840,
        "\x78\x9c\xec\xdd\x4f\x68\x1c\x65\x1b\x00\xf0\x67\x66\xb3\x4d\xff\xe4"
        "\xfb\xd2\x0f\xbe\x0f\x3e\xa5\x87\xa2\x42\x85\xd2\x4d\xd2\x3f\x5a\x3d"
        "\xb5\x57\xb1\x50\xe8\x41\xf0\xa2\x61\xb3\x0d\x25\x9b\x6c\xc9\x26\xda"
        "\x84\x80\xe9\xbd\x88\x3d\x88\x4a\x2f\xf5\xa6\x07\x8f\x8a\x07\x0f\xe2"
        "\xc5\xa3\x57\x2f\x8a\x67\xa1\xd8\xa0\xd0\xf4\xa0\x2b\x9b\x9d\x4d\xd3"
        "\x74\xb7\x6e\x62\x36\x5b\xb3\xbf\x1f\x4c\xf6\x7d\x67\x66\xf7\x79\xdf"
        "\x99\x7d\xde\xec\x0c\x33\x4c\x00\x7d\xeb\x68\xfd\x4f\x1a\xf1\x54\x44"
        "\x5c\x4c\x22\x86\x37\x2c\x1b\x88\x6c\xe1\xd1\xc6\x7a\xab\x2b\x4b\xc5"
        "\xfb\x2b\x4b\xc5\x24\x6a\xb5\x4b\xbf\x24\x91\x44\xc4\xbd\x95\xa5\x62"
        "\x73\xfd\x24\x7b\x3d\x14\x11\xcb\x11\xf1\xff\x88\xf8\x26\x1f\x71\x3c"
        "\x5d\xff\xc8\x7d\xcd\x42\x75\x61\x71\x6a\xbc\x5c\x2e\xcd\x66\xf5\x91"
        "\xb9\xe9\xab\x23\xd5\x85\xc5\x13\x57\xa6\xc7\x27\x4b\x93\xa5\x99\x53"
        "\x2f\xbe\x74\xe6\xec\xe9\x33\x63\x27\xc7\x36\x36\xf7\x7e\x6d\x63\x2d"
        "\xbf\xb5\xbe\xde\xf8\xf1\xe6\xbb\x37\xbe\x7b\xe5\xf6\xcd\x4f\x3f\x3b"
        "\xb2\x5c\x7c\x7f\x3c\x89\x73\x31\x94\x2d\xdb\xd8\x8f\x9d\xd4\xd8\x26"
        "\xf9\x38\xb7\x69\xfe\xe9\x6e\x04\xeb\xa1\xa4\xd7\x0d\x60\x5b\x72\x59"
        "\x9e\xd7\x53\xe9\x7f\x31\x1c\xb9\x2c\xeb\x5b\xa9\x6d\x1c\x1c\x06\x77"
        "\xa5\x79\x40\x17\xd5\x06\x23\x6a\xeb\x36\x14\x81\x3e\x90\x48\x7a\xe8"
        "\x53\xcd\xdf\x01\xf5\xe3\xdf\xe6\xb4\x9b\xbf\x3f\xee\x9c\x6f\x1c\x80"
        "\xd4\xe3\xae\xae\x2c\x15\xdf\x89\x66\xfc\x81\xc6\xb9\x89\xd8\xbf\x76"
        "\x6c\x72\xf0\xd7\xe4\xa1\x23\x93\xfa\xf1\xe6\xe1\xdd\x6c\x28\x7b\xd2"
        "\xf2\xf5\x88\x18\x1d\x18\x78\xf4\xfb\x9f\x64\xdf\xbf\xed\x1b\xdd\x89"
        "\x06\xd2\x55\x5f\x9f\x6f\xec\xa8\x47\xf7\x7f\xba\x3e\xfe\x44\x8b\xf1"
        "\x67\xa8\x79\xee\xf4\x6f\x6a\x8e\x7f\xab\xd9\xf8\xb7\xda\x22\x7e\xae"
        "\xcd\xf8\x77\xb1\xc3\x18\xbf\xbf\xfe\xd3\x47\x6d\xe3\x5f\x1f\x8c\xa7"
        "\x5b\xc6\x4f\xd6\xe3\x27\x2d\xe2\xa7\x11\xf1\x66\x87\xf1\x6f\xbd\xf6"
        "\xe5\xd9\x76\xcb\x6a\x1f\x47\x1c\x8b\xd6\xf1\x9b\x92\xc7\x9f\x1f\x1e"
        "\xb9\x7c\xa5\x5c\x1a\x6d\xfc\x6d\x19\xe3\xab\x63\x47\x5e\x6e\xdf\xff"
        "\x88\x83\x6d\xe2\x37\xce\xd9\xee\x5f\x6b\xc8\xc6\xfe\xef\xcb\xda\x94"
        "\x76\xd8\xff\x2f\xbe\xfd\xfc\x99\xe5\xc7\xc4\x7f\xfe\xd9\xc7\xef\xff"
        "\x56\xdb\xff\x40\x44\xbc\xd7\x61\xfc\xff\xdc\xfb\xe4\xd5\x76\xcb\xee"
        "\x5c\x4f\xee\xd6\x7f\x05\x6c\x75\xff\x27\x91\x8f\xdb\x1d\xc6\x7f\xe1"
        "\xdc\xd1\x1f\xb2\xa2\xb3\x86\x00\x00\x00\x00\x00\x00\x00\x00\xb0\x83"
        "\xd2\xb5\x6b\xd9\x92\xb4\xb0\x5e\x4e\xd3\x42\xa1\x71\x0f\xef\x7f\xe3"
        "\x60\x5a\xae\x54\xe7\x8e\x5f\xae\xcc\xcf\x4c\x34\xae\x79\x3b\x1c\xf9"
        "\xb4\x79\xa5\xd5\x70\xa3\x9e\xd4\xeb\x63\xd9\xf5\xb8\xcd\xfa\xc9\x4d"
        "\xf5\x53\xb9\x2c\x60\xee\xc0\x5a\xbd\x50\xac\x94\x27\x7a\xdc\x77\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x78\x52\x1c"
        "\xda\x74\xff\xff\x6f\xb9\xb5\xfb\xff\x37\x3f\xae\x1a\xd8\xab\xda\x3f"
        "\xf2\x1b\xd8\xeb\xe4\x3f\xf4\xaf\x87\xf3\x3f\xe9\x59\x3b\x80\xdd\xe7"
        "\xff\x3f\xf4\xad\x9a\xfc\x87\xfe\x25\xff\xa1\x7f\xc9\x7f\xe8\x5f\xf2"
        "\x1f\xfa\x97\xfc\x87\xfe\x25\xff\xa1\x7f\xc9\x7f\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe8\x8a"
        "\x8b\x17\x2e\xd4\xa7\xda\xfd\x95\xa5\x62\xbd\x3e\x31\xb0\x30\x3f\x55"
        "\x79\xeb\xc4\x44\xa9\x3a\x55\x98\x9e\x2f\x16\x8a\x95\xd9\xab\x85\xc9"
        "\x4a\x65\xb2\x5c\x2a\x14\x2b\xd3\x7f\xf5\x79\x49\xa5\x72\x75\x34\x66"
        "\xe6\xaf\x8d\xcc\x95\xaa\x73\x23\xd5\x85\xc5\x37\xa6\x2b\xf3\x33\xcd"
        "\x67\x8a\x96\xf2\x5d\xef\x11\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\xfc\xf3\x0c\xad\x4d\x49\x5a\x88\xc8\x37\xea\x69"
        "\x5a\x28\x44\xfc\x2b\x22\x0e\x27\x91\x5c\xbe\x52\x2e\x8d\x46\xc4\xbf"
        "\x23\xe2\xfb\x5c\x7e\xb0\x5e\x1f\xeb\x75\xa3\x01\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x60\x8f\xa9\x2e\x2c\x4e\x8d\x97"
        "\xcb\xa5\xd9\xee\x15\x06\xb2\x50\x5d\x0c\xd1\x79\x61\x60\x2b\x2b\x47"
        "\xc4\xf2\xce\x36\xa3\xfe\x89\x5b\x7e\x57\x3e\xdb\x80\x3d\xde\x74\x7b"
        "\xa3\x90\x7b\x32\xbe\x87\x4f\x7e\xa1\x87\x83\x12\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf4\xa9\x07\x37\xfd\x76\xfa\x8e"
        "\x3f\xba\xdb\x20\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\xe8\x4b\xe9\xcf\x49\x44\xd4\xa7\x63\xc3\xcf\x0d\x6d\x5e\xba"
        "\x2f\x59\xcd\xad\xbd\x46\xc4\xdb\xb7\x2e\x7d\x70\x6d\x7c\x6e\x6e\x76"
        "\xac\x3e\xff\xee\xfa\xfc\xb9\x0f\xb3\xf9\x27\x7b\xd1\x7e\xa0\x53\xcd"
        "\x3c\x4d\x23\xa2\x9e\xc7\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\xc0\x03\xd5\x85\xc5\xa9\xf1\x72\xb9\x34\xbb\xcd\xc2\x60\x07"
        "\xeb\xf4\xba\x8f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xdb\xf1\x67\x00"
        "\x00\x00\xff\xff\x2e\x16\xce\x51",
        1436));
    NONFAILING(syz_mount_image(/*fs=*/0x2000000000c0, /*dir=*/0x200000000000,
                               /*flags=MS_STRICTATIME|MS_MANDLOCK*/ 0x1000040,
                               /*opts=*/0x2000000002c0, /*chdir=*/1,
                               /*size=*/0x59c, /*img=*/0x200000001840));
    break;
  case 1:
    //  openat arguments: [
    //    fd: fd_dir (resource)
    //    file: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
    //    }
    //    flags: open_flags = 0x105042 (4 bytes)
    //    mode: open_mode = 0x1c3 (2 bytes)
    //  ]
    //  returns fd
    NONFAILING(memcpy((void*)0x200000000180, "./file1\000", 8));
    res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000180ul,
                  /*flags=O_SYNC|O_DIRECT|O_CREAT|O_RDWR*/ 0x105042,
                  /*mode=S_IXOTH|S_IWOTH|S_IXUSR|S_IWUSR|S_IRUSR*/ 0x1c3);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    //  mmap arguments: [
    //    addr: VMA[0x600000]
    //    len: len = 0x600000 (8 bytes)
    //    prot: mmap_prot = 0x27ffff7 (8 bytes)
    //    flags: mmap_flags = 0x4012011 (8 bytes)
    //    fd: fd (resource)
    //    offset: intptr = 0x0 (8 bytes)
    //  ]
    syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x600000ul,
            /*prot=PROT_GROWSUP|PROT_WRITE|PROT_READ|PROT_EXEC|0x7ffff0*/
            0x27ffff7ul,
            /*flags=MAP_UNINITIALIZED|MAP_NONBLOCK|MAP_LOCKED|MAP_FIXED|0x1*/
            0x4012011ul, /*fd=*/r[0], /*offset=*/0ul);
    break;
  case 3:
    //  writev arguments: [
    //    fd: fd (resource)
    //    vec: ptr[in, array[iovec[in, array[int8]]]] {
    //      array[iovec[in, array[int8]]] {
    //        iovec[in, array[int8]] {
    //          addr: ptr[in, buffer] {
    //            buffer: {dd} (length 0x1)
    //          }
    //          len: len = 0x1 (8 bytes)
    //        }
    //      }
    //    }
    //    vlen: len = 0x1 (8 bytes)
    //  ]
    NONFAILING(*(uint64_t*)0x200000000580 = 0x200000000440);
    NONFAILING(memset((void*)0x200000000440, 221, 1));
    NONFAILING(*(uint64_t*)0x200000000588 = 1);
    syscall(__NR_writev, /*fd=*/r[0], /*vec=*/0x200000000580ul, /*vlen=*/1ul);
    break;
  case 4:
    //  openat$cuse arguments: [
    //    fd: const = 0xffffffffffffff9c (8 bytes)
    //    file: ptr[in, buffer] {
    //      buffer: {2f 64 65 76 2f 63 75 73 65 00} (length 0xa)
    //    }
    //    flags: const = 0x2 (4 bytes)
    //    mode: const = 0x0 (2 bytes)
    //  ]
    //  returns fd_fuse
    NONFAILING(memcpy((void*)0x200000000100, "/dev/cuse\000", 10));
    res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                  /*file=*/0x200000000100ul, /*flags=*/2, /*mode=*/0);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    //  read$FUSE arguments: [
    //    fd: fd_fuse (resource)
    //    buf: ptr[out, fuse_in[read_buffer]] {
    //      fuse_in[read_buffer] {
    //        len: len = 0x2020 (4 bytes)
    //        opcode: int32 = 0x0 (4 bytes)
    //        unique: fuse_unique (resource)
    //        uid: uid (resource)
    //        gid: gid (resource)
    //        pid: pid (resource)
    //        padding: int32 = 0x0 (4 bytes)
    //        payload: buffer: (DirOut)
    //      }
    //    }
    //    len: bytesize = 0x2020 (8 bytes)
    //  ]
    syscall(__NR_read, /*fd=*/r[1], /*buf=*/0x200000000940ul, /*len=*/0x2020ul);
    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();
  loop();
  return 0;
}