// https://syzkaller.appspot.com/bug?id=6cd217d3878763ebef28a8fd279c88e791c1c9ef
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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 bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

#define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak"

static void setup_leak()
{
  if (!write_file(KMEMLEAK_FILE, "scan"))
    exit(1);
  sleep(5);
  if (!write_file(KMEMLEAK_FILE, "scan"))
    exit(1);
  if (!write_file(KMEMLEAK_FILE, "clear"))
    exit(1);
}

static void check_leaks(void)
{
  int fd = open(KMEMLEAK_FILE, O_RDWR);
  if (fd == -1)
    exit(1);
  uint64_t start = current_time_ms();
  if (write(fd, "scan", 4) != 4)
    exit(1);
  sleep(1);
  while (current_time_ms() - start < 4 * 1000)
    sleep(1);
  if (write(fd, "scan", 4) != 4)
    exit(1);
  static char buf[128 << 10];
  ssize_t n = read(fd, buf, sizeof(buf) - 1);
  if (n < 0)
    exit(1);
  int nleaks = 0;
  if (n != 0) {
    sleep(1);
    if (write(fd, "scan", 4) != 4)
      exit(1);
    if (lseek(fd, 0, SEEK_SET) < 0)
      exit(1);
    n = read(fd, buf, sizeof(buf) - 1);
    if (n < 0)
      exit(1);
    buf[n] = 0;
    char* pos = buf;
    char* end = buf + n;
    while (pos < end) {
      char* next = strstr(pos + 1, "unreferenced object");
      if (!next)
        next = end;
      char prev = *next;
      *next = 0;
      fprintf(stderr, "BUG: memory leak\n%s\n", pos);
      *next = prev;
      pos = next;
      nleaks++;
    }
  }
  if (write(fd, "clear", 5) != 5)
    exit(1);
  close(fd);
  if (nleaks)
    exit(1);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      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;
    }
    check_leaks();
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 1ul, 1ul, 0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000240 = 0x400071f;
  syscall(__NR_setsockopt, r[0], 1, 0x10, 0x20000240ul, 4ul);
  res = syscall(__NR_socket, 1ul, 1ul, 0);
  if (res != -1)
    r[1] = res;
  *(uint16_t*)0x200001c0 = 1;
  memcpy(
      (void*)0x200001c2,
      "\351\037q\211Y\036\2223aK\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
      108);
  syscall(__NR_bind, r[1], 0x200001c0ul, 0x56ul);
  syscall(__NR_listen, r[1], 0);
  *(uint16_t*)0x20000140 = 1;
  memcpy(
      (void*)0x20000142,
      "\351\037q\211Y\036\2223aK\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
      "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
      108);
  syscall(__NR_connect, r[0], 0x20000140ul, 0x6eul);
  res = syscall(__NR_accept, r[1], 0ul, 0ul);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x20000280,
         "\xfa\x0f\x3a\x50\x42\x12\xb0\x57\x1f\xdc\xf7\x01\xa1\x7a\xd5\xe4\xae"
         "\xf3\xe5\x77\xa3\x8f\x1e\x20\xcc\x63\xf3\xd1\x0f\x77\x51\x48\x0f\xa1"
         "\xa7\x0a\x89\x7f\x42\xf3\xb0\x44\xe0\x24\x92\x57\x18\x70\x82\x00\x00"
         "\x00\x00\x00\x00\x00\x1f\x4e\x16\xf1\x9b\x07\xa1\x2e\xf5\x90\x69\xf6"
         "\xfd\xf8\x66\x37\x0b\xb3\x6f\xf4\xb4\x71\x13\x7f\xdb\xc6\x0b\x9c\x60"
         "\x39\x52\x3b\xd0\x5d\xa9\xa4\x45\x23\xd1\x94\xd5\xa1\x4e\x87\x7b\x17"
         "\x06\x9f\x3c\xca\x62\x69\x2b\xfe\x34\x2b\x83\x42\xa7\x7c\xd5\x32\x0d"
         "\xb8\x71\xf6\x96\xc1\xa9\xb7\x2a\xaf\x61\xb6\xc1\x07\xa9\xda\x4c\x87"
         "\x64\x8a\x48\x9e\xbb\x46\xe1\xeb\xfd\x52\x33\x19\x84\xf4\xdb\x30\xf4"
         "\xa9\xfc\x69\x03\xc1\x03\xe9\x44\x8d\xcd\x5f\x40\x28\x8a\x41\x23\xbd"
         "\x4d\x5b\x6f\xa7\xc2\xc0\x81\xcd\x68\xb8\x08\xe4\x78\xd8\x5b\xb0\x68"
         "\x3b\xb3\x32\x26\xda\x56\x1d\x35\xbd\xdd\x12\x78",
         199);
  syscall(__NR_sendto, r[2], 0x20000280ul, 0xc7ul, 0x44845ul, 0ul, 0ul);
}
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);
  setup_leak();
  loop();
  return 0;
}