// https://syzkaller.appspot.com/bug?id=569a3f13d53c4b89d9dda09a5da30e060715334b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#ifndef SYS_compat_40_mount
#define SYS_compat_40_mount 21
#endif
#ifndef SYS_mknod
#define SYS_mknod 450
#endif
#ifndef SYS_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_rename
#define SYS_rename 128
#endif
#ifndef SYS_symlink
#define SYS_symlink 57
#endif

static unsigned long long procid;

static void kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

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 execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

void execute_one(void)
{
  memcpy((void*)0x20000380, "tmpfs\000", 6);
  memcpy((void*)0x200003c0, ".\000", 2);
  memset((void*)0x20000140, 1, 1);
  syscall(SYS_compat_40_mount, /*type=*/0x20000380ul, /*path=*/0x200003c0ul,
          /*flags=*/0ul, /*data=*/0x20000140ul);
  memcpy((void*)0x20000080, ".\000", 2);
  memcpy((void*)0x20000240, "./file0\000", 8);
  syscall(SYS_symlink, /*old=*/0x20000080ul, /*new=*/0x20000240ul);
  memcpy((void*)0x20000000, "./file1\000", 8);
  syscall(SYS_mknod, /*file=*/0x20000000ul,
          /*mode=S_IXOTH|S_IROTH|S_IWGRP|S_IFSOCK|S_IFCHR*/ 0xe015ul,
          /*dev=*/0ul);
  memcpy((void*)0x200004c0, "./file0\000", 8);
  memcpy((void*)0x20000700, "./file1\000", 8);
  syscall(SYS_rename, /*old=*/0x200004c0ul, /*new=*/0x20000700ul);
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ*/ 3ul,
          /*flags=MAP_PRIVATE|MAP_FIXED|MAP_ANON*/ 0x1012ul, /*fd=*/-1,
          /*pad=*/0ul, /*offset=*/0ul);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}