// https://syzkaller.appspot.com/bug?id=7bad537bae6f04bb2e65c24d8e04c4fb94fffa38
// 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[3] = {0xffffffffffffffff, 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*)0x20000000, "task\000", 5);
  res = -1;
  res = syz_open_procfs(0, 0x20000000);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200001c0, "smaps\000", 6);
  res = -1;
  res = syz_open_procfs(0, 0x200001c0);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x20000080 = 0;
  res = syscall(__NR_signalfd, -1, 0x20000080ul, 8ul);
  if (res != -1)
    r[2] = res;
  syscall(__NR_dup3, r[2], r[1], 0ul);
  memset((void*)0x20000100, 0, 1);
  memcpy((void*)0x200000c0, "./file0\000", 8);
  syscall(__NR_linkat, r[1], 0x20000100ul, r[0], 0x200000c0ul, 0x1400ul);
  return 0;
}