// https://syzkaller.appspot.com/bug?id=4ca9a2af9ec07045c7b98a2a8e8e8f28a51b865a
// 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 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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  intptr_t res = 0;
  memcpy((void*)0x20000000, "./file0\000", 8);
  syscall(__NR_mkdir, 0x20000000ul, 0ul);
  memcpy((void*)0x20000500, "./file1\000", 8);
  syscall(__NR_mkdir, 0x20000500ul, 0ul);
  memcpy((void*)0x20000300, "./file0\000", 8);
  memcpy((void*)0x20000100, "overlay\000", 8);
  memcpy((void*)0x200002c0, "upperdir=./file0,lowerdir=.:file0,workdir=./file1",
         49);
  syscall(__NR_mount, 0x400000ul, 0x20000300ul, 0x20000100ul, 0ul,
          0x200002c0ul);
  memcpy((void*)0x20000000, "./file0/f.le.\000", 14);
  syscall(__NR_mkdir, 0x20000000ul, 0ul);
  memcpy((void*)0x20000040, "./file0/f.le.\000", 14);
  syscall(__NR_rmdir, 0x20000040ul);
  memcpy((void*)0x20000940, "./file0/f.le.\000", 14);
  syscall(__NR_execve, 0x20000940ul, 0ul, 0ul);
  memcpy((void*)0x20000080, "stack\000", 6);
  res = syz_open_procfs(0, 0x20000080);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20002000, "./bus\000", 6);
  res = syscall(__NR_open, 0x20002000ul, 0x141042ul, 0ul);
  if (res != -1)
    r[1] = res;
  syscall(__NR_sendfile, r[1], r[0], 0ul, 0x209ul);
  return 0;
}