// https://syzkaller.appspot.com/bug?id=56d24184b2ecfc85f92e1fec8c69f66644f2f80c
// 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 279
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_setxattr
#define __NR_setxattr 5
#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")) {
  }
}

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 < 3; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      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);
}

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);
  }
}

void execute_call(int call)
{
  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 = 0x3000010 (8 bytes)
    //    opts: ptr[in, fs_options[ext4_options]] {
    //      fs_options[ext4_options] {
    //        elems: array[fs_opt_elem[ext4_options]] {
    //        }
    //        common: array[fs_opt_elem[fs_options_common]] {
    //        }
    //        null: const = 0x0 (1 bytes)
    //      }
    //    }
    //    chdir: int8 = 0x1 (1 bytes)
    //    size: len = 0x513 (8 bytes)
    //    img: ptr[in, buffer] {
    //      buffer: (compressed buffer with length 0x513)
    //    }
    //  ]
    //  returns fd_dir
    NONFAILING(memcpy((void*)0x200000c0, "ext4\000", 5));
    NONFAILING(memcpy((void*)0x20000040, "./file1\000", 8));
    NONFAILING(*(uint8_t*)0x20000080 = 0);
    NONFAILING(memcpy(
        (void*)0x200010c0,
        "\x78\x9c\xec\xdd\xdf\x6b\x63\x59\x1d\x00\xf0\xef\xbd\x6d\x66\x3b\x33"
        "\x5d\x93\x55\x91\x75\xc1\x75\x71\x57\x3a\x8b\x4e\xd2\x6e\xdd\xdd\x22"
        "\xa2\xeb\x8b\x3e\x2d\xa8\xeb\x7b\xad\x6d\x5a\x4a\x93\xa6\x34\xe9\x3a"
        "\x2d\x8b\x76\xf1\x3f\x10\x41\xc1\x27\x9f\x7c\x11\xfc\x03\x84\x65\x1e"
        "\xfc\x03\x64\x60\x40\x5f\xc4\x07\x51\x51\x44\x67\xf4\x41\x50\xe7\x4a"
        "\x92\x1b\xa7\x93\x26\x6d\xdd\x69\x9b\x4e\xf3\xf9\xc0\x69\xce\xb9\xf7"
        "\xe6\x7e\xcf\xb9\x21\x27\xf7\xc7\xe9\xbd\x01\x8c\xad\x17\x22\xe2\x8d"
        "\x88\x98\x88\x88\x97\x23\xa2\x98\x4f\x4f\xf3\xb4\xd8\x2e\xec\x77\x97"
        "\xbb\x7f\xef\x9d\xe5\x76\x4a\x22\xcb\xde\xfa\x6b\x12\x49\x3e\xad\xb7"
        "\xae\x76\x79\x32\x22\xae\x77\xdf\x12\x53\x11\xf1\xb5\x2f\x47\x7c\x33"
        "\x39\x1c\xb7\xb9\xbb\xb7\xb1\x54\xab\x55\xb7\xf3\x72\xa5\x55\xdf\xaa"
        "\x34\x77\xf7\x6e\xae\xd7\x97\xd6\xaa\x6b\xd5\xcd\xf9\xf9\xb9\xd7\x16"
        "\x5e\x5f\x78\x75\x61\x36\xcb\x3d\x56\x3b\x4b\xbd\xcc\x4f\xbe\xf4\xf9"
        "\xf7\x3e\xfd\xad\xdf\x2d\xfe\xf9\xc6\xb7\xdb\xd5\xfa\xdc\x47\xa2\x10"
        "\x7d\xed\x38\x4d\xdd\xa6\x17\x3a\xdb\xa2\xa7\xbd\x8d\xb6\xcf\x22\xd8"
        "\x08\x4c\xe4\xed\x29\x8c\xba\x22\x00\x00\x9c\x48\x7b\x1f\xff\x83\x11"
        "\xf1\x89\xce\xfe\x7f\x31\x26\x3a\x7b\x73\x7d\x26\x46\x51\x33\x00\x00"
        "\x00\xe0\xb4\x64\x5f\x98\x8e\x7f\x27\x11\x19\x00\x00\x00\x70\x69\xa5"
        "\x11\x31\x1d\x49\x5a\xce\xc7\x02\x4c\x47\x9a\x5e\xc9\xcf\x0d\x7c\x38"
        "\xae\xa5\xb5\x46\xb3\xf5\xa9\xd5\xc6\xce\xe6\x4a\x7b\x5e\x44\x29\x0a"
        "\xe9\xea\x7a\xad\x3a\x9b\x8f\x15\x2e\x45\x21\x69\x97\xe7\xf2\x31\xb6"
        "\xbd\xf2\x2b\x7d\xe5\xf9\x88\x78\x26\x22\xbe\x5f\xbc\xda\x29\x97\x97"
        "\x1b\xb5\x95\x11\x9f\xfb\x00\x00\x00\x80\x71\x71\xbd\xef\xf8\xff\x1f"
        "\xc5\xb4\x93\x3f\xde\x80\xff\x13\x00\x00\x00\x00\x2e\xae\xd2\xd0\x02"
        "\x00\x00\x00\x70\x59\x38\xe4\x07\x00\x00\x80\xcb\xaf\xff\xf8\xff\xbd"
        "\x11\xd5\x03\x00\x00\x00\x38\x13\x5f\x79\xf3\xcd\x76\xca\x7a\xcf\xbf"
        "\x5e\x79\x7b\x77\x67\xa3\xf1\xf6\xcd\x95\x6a\x73\xa3\x5c\xdf\x59\x2e"
        "\x2f\x37\xb6\xb7\xca\x6b\x8d\xc6\x5a\xe7\x9e\x7d\xf5\xe3\xd6\x57\x6b"
        "\x34\xb6\x3e\x13\x9b\x3b\xb7\x2a\xad\x6a\xb3\x55\x69\xee\xee\x2d\xd6"
        "\x1b\x3b\x9b\xad\xc5\xf5\x47\x1e\x81\x0d\x00\x00\x00\x9c\xa3\x67\x3e"
        "\x7e\xfb\xd7\x49\x44\xec\x7f\xf6\x6a\x27\x45\x7e\x1f\x40\x80\x47\xfc"
        "\x61\xd4\x15\x00\x4e\xd3\xc4\xa8\x2b\x00\x8c\x8c\xbb\x78\xc3\xf8\x2a"
        "\x8c\xba\x02\xc0\xc8\x25\xc7\xcc\x37\x78\x07\x00\x00\x9e\x7c\x33\x1f"
        "\x3d\x7c\xfd\xbf\xf7\xfc\x7f\xe7\x06\xe0\x72\x33\xd6\x07\x00\xc6\x8f"
        "\xeb\xff\x30\xbe\x0a\x46\x00\xc2\x58\x4b\x23\xe2\x03\xdd\xec\x53\xc3"
        "\x96\x19\x7a\xfd\xff\x97\x27\x8d\x92\x65\x11\x77\x8a\x07\xa7\x38\xbf"
        "\x08\x00\x00\xe7\x6b\xba\x93\x92\xb4\x9c\x1f\x07\x4c\x47\x9a\x96\xcb"
        "\x11\x4f\x47\xa4\xa5\x28\x24\xab\xeb\xb5\xea\x6c\x7e\x7c\xf0\xab\x62"
        "\xe1\xa9\x76\x79\xae\xf3\xce\xe4\xd8\x31\xc3\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x57\x96\x25"
        "\x91\x01\x00\x00\x00\x97\x5a\x44\xfa\xa7\xa4\x73\x37\xff\x88\x99\xe2"
        "\x4b\xd3\xfd\xe7\x07\xae\x24\xff\x2c\xc6\x1f\xf3\xc2\x8f\xde\xfa\xc1"
        "\xad\xa5\x56\x6b\x7b\xae\x3d\xfd\x6f\x9d\x67\x79\x5d\x89\x88\xd6\x0f"
        "\xf3\xe9\xaf\x0c\x7d\x7c\x18\x00\x00\x00\x70\xda\x92\xfd\xa1\xb3\xba"
        "\xc7\xe9\xf9\xeb\xdc\xb9\xd6\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x31\x70\xff\xde\x3b"
        "\xcb\xbd\x74\x9e\x71\xff\xf2\xc5\x88\x28\x0d\x8a\x3f\x19\x53\x9d\xd7"
        "\xa9\x28\x44\xc4\xb5\xbf\x27\x31\x79\xe0\x7d\x49\x44\x4c\x9c\x42\xfc"
        "\xfd\x77\x23\xe2\xd9\x41\xf1\x93\x78\x90\x65\x59\x29\xaf\xc5\xa0\xf8"
        "\x57\xcf\x38\x7e\xa9\xb3\x69\x06\xc7\x4f\x23\xe2\xfa\x29\xc4\x87\x71"
        "\x76\xbb\xdd\xff\xbc\x31\xe8\xfb\x97\xc6\x0b\x9d\xd7\xc1\xdf\xbf\xc9"
        "\x3c\x3d\xae\xe1\xfd\x5f\x9a\x47\x7e\xb6\xd3\xcf\x0d\xea\x7f\x9e\x3e"
        "\xb4\xb6\xfa\xc0\x18\xcf\xdd\xfd\x59\x65\x68\xfc\x77\x23\x9e\x9b\x1c"
        "\xdc\xff\xf4\xfa\xdf\x64\x48\xfc\x17\x0f\xad\xed\x5f\x59\x96\x1d\x8e"
        "\xf1\x8d\xaf\xef\xed\x0d\x8b\x9f\xfd\x38\x62\x66\xe0\xef\x4f\xf2\x48"
        "\xac\x4a\xab\xbe\x55\x69\xee\xee\xdd\x5c\xaf\x2f\xad\x55\xd7\xaa\x9b"
        "\xf3\xf3\x73\xaf\x2d\xbc\xbe\xf0\xea\xc2\x6c\x65\x75\xbd\x56\xcd\xff"
        "\x0e\x8c\xf1\xbd\x8f\xfd\xfc\xc1\x51\xed\xbf\x36\x20\xfe\x6f\x7f\xd3"
        "\xed\x7f\x8f\x6a\xff\x4b\xc3\x56\xda\xe7\x3f\x77\x6f\xdd\xfb\x50\x37"
        "\x5b\x18\x14\xff\xc6\x8b\x03\x7f\x7f\xa7\x62\x48\xfc\x34\xff\xed\xfb"
        "\x64\x9e\x6f\xcf\x9f\xe9\xe5\xf7\xbb\xf9\x83\x9e\xff\xe9\x9d\xe7\x8f"
        "\x6a\xff\xca\x90\xed\x7f\xdc\xe7\x7f\xe3\x84\xed\x7f\xf9\xab\xdf\xfd"
        "\xfd\x09\x17\x05\x00\xce\x41\x73\x77\x6f\x63\xa9\x56\xab\x6e\x1f\x91"
        "\x99\x3a\xc1\x32\x4f\x62\xe6\x17\x53\x17\xa2\x1a\xff\x67\x26\xfb\x4e"
        "\xf7\x93\xbb\x28\xf5\x79\xbf\x99\xf6\xde\xea\xc3\x29\xbd\x56\x5d\x80"
        "\x8a\x1d\xc8\x64\xe7\x16\x6b\x22\x2e\x48\x93\xff\x97\x19\x69\xb7\x04"
        "\x00\x00\x9c\x81\x87\x3b\xfd\xa3\xae\x09\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x8c\xaf\xf3\xb8\x9d\x58\x7f\xcc\xfd"
        "\xd1\x34\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x48\xff\x0d\x00"
        "\x00\xff\xff\xcc\xfe\xdf\xeb",
        1299));
    NONFAILING(syz_mount_image(
        /*fs=*/0x200000c0, /*dir=*/0x20000040,
        /*flags=MS_LAZYTIME|MS_SYNCHRONOUS|MS_STRICTATIME*/ 0x3000010,
        /*opts=*/0x20000080, /*chdir=*/1, /*size=*/0x513, /*img=*/0x200010c0));
    break;
  case 1:
    //  setxattr$trusted_overlay_upper arguments: [
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    name: ptr[in, buffer] {
    //      buffer: {74 72 75 73 74 65 64 2e 6f 76 65 72 6c 61 79 2e 75 70 70 65
    //      72 00} (length 0x16)
    //    }
    //    val: ptr[inout, array[ANYUNION]] {
    //      array[ANYUNION] {
    //      }
    //    }
    //    size: len = 0x1015 (8 bytes)
    //    flags: setxattr_flags = 0x0 (8 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x20000080, "./file0\000", 8));
    NONFAILING(memcpy((void*)0x200000c0, "trusted.overlay.upper\000", 22));
    syscall(__NR_setxattr, /*path=*/0x20000080ul, /*name=*/0x200000c0ul,
            /*val=*/0x20000040ul, /*size=*/0x1015ul, /*flags=*/0ul);
    break;
  case 2:
    //  setxattr$trusted_overlay_upper arguments: [
    //    path: ptr[in, buffer] {
    //      buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8)
    //    }
    //    name: ptr[in, buffer] {
    //      buffer: {74 72 75 73 74 65 64 2e 6f 76 65 72 6c 61 79 2e 75 70 70 65
    //      72 00} (length 0x16)
    //    }
    //    val: ptr[inout, array[ANYUNION]] {
    //      array[ANYUNION] {
    //      }
    //    }
    //    size: len = 0x1015 (8 bytes)
    //    flags: setxattr_flags = 0x0 (8 bytes)
    //  ]
    NONFAILING(memcpy((void*)0x20000080, "./file0\000", 8));
    NONFAILING(memcpy((void*)0x200000c0, "trusted.overlay.upper\000", 22));
    syscall(__NR_setxattr, /*path=*/0x20000080ul, /*name=*/0x200000c0ul,
            /*val=*/0x20000040ul, /*size=*/0x1015ul, /*flags=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000,
          /*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=*/0x21000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}