// https://syzkaller.appspot.com/bug?id=b081b5a0ec104bd948dc209e697565f0ed04cec3
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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 long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

uint64_t r[1] = {0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0ul);
  use_temporary_dir();
  intptr_t res = 0;
  memcpy((void*)0x20000040, "\x29\x00\x00\x00\x01\x00\x00\x00\x0b", 9);
  syscall(__NR_open_by_handle_at, 0xffffff9c, 0x20000040ul, 0ul);
  memcpy((void*)0x200000c0, "fd/3\000", 5);
  res = syz_open_procfs(0, 0x200000c0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_lseek, r[0], -1ul, 2ul);
  syscall(__NR_getdents64, r[0], 0ul, 0xc0000000ul);
  return 0;
}