// https://syzkaller.appspot.com/bug?id=120e32d4657423b89e205beb9f310e8c3f557791
// 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, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  intptr_t res = 0;
  memcpy((void*)0x20000100, ".\000", 2);
  res = syscall(__NR_openat, 0xffffff9c, 0x20000100ul, 0ul, 0ul);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200000c0, "/\000", 2);
  memcpy((void*)0x20d06ff8, "./file0\000", 8);
  syscall(__NR_symlinkat, 0x200000c0ul, r[0], 0x20d06ff8ul);
  memcpy((void*)0x20000080, "net\000", 4);
  res = -1;
  res = syz_open_procfs(0, 0x20000080);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x20000000, "./file0\000", 8);
  memcpy((void*)0x20000040, "./file0\000", 8);
  syscall(__NR_linkat, r[0], 0x20000000ul, r[1], 0x20000040ul, 0ul);
  return 0;
}