// https://syzkaller.appspot.com/bug?id=c73756cc996a58a625da35fbaa90ba6b9e0c60dc
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <pthread.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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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 use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void __attribute__((noinline)) remove_dir(const char* dir)
{
  DIR* dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EACCES) {
      if (rmdir(dir))
        exit(1);
      return;
    }
    exit(1);
  }
  struct dirent* ep = 0;
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename))
      exit(1);
  }
  closedir(dp);
  if (rmdir(dir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i = 0;
  for (; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

#define __syscall syscall

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  for (call = 0; call < 2; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    memcpy((void*)0x20000480, "/dev/vmm\000", 9);
    res = syscall(SYS_openat, 0xffffffffffffff9cul, 0x20000480ul, 0ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint32_t*)0x20000580 = 1;
    *(uint32_t*)0x20000584 = 0;
    *(uint64_t*)0x20000588 = 1;
    *(uint64_t*)0x20000590 = 0;
    *(uint64_t*)0x20000598 = 0;
    *(uint64_t*)0x200005a0 = 0;
    *(uint64_t*)0x200005a8 = 0x20000000;
    *(uint64_t*)0x200005b0 = 0x200000;
    *(uint64_t*)0x200005b8 = 0;
    *(uint64_t*)0x200005c0 = 0;
    *(uint64_t*)0x200005c8 = 0;
    *(uint64_t*)0x200005d0 = 0;
    *(uint64_t*)0x200005d8 = 0;
    *(uint64_t*)0x200005e0 = 0;
    *(uint64_t*)0x200005e8 = 0;
    *(uint64_t*)0x200005f0 = 0;
    *(uint64_t*)0x200005f8 = 0;
    *(uint64_t*)0x20000600 = 0;
    *(uint64_t*)0x20000608 = 0;
    *(uint64_t*)0x20000610 = 0;
    *(uint64_t*)0x20000618 = 0;
    *(uint64_t*)0x20000620 = 0;
    *(uint64_t*)0x20000628 = 0;
    *(uint64_t*)0x20000630 = 0;
    *(uint64_t*)0x20000638 = 0;
    *(uint64_t*)0x20000640 = 0;
    *(uint64_t*)0x20000648 = 0;
    *(uint64_t*)0x20000650 = 0;
    *(uint64_t*)0x20000658 = 0;
    *(uint64_t*)0x20000660 = 0;
    *(uint64_t*)0x20000668 = 0;
    *(uint64_t*)0x20000670 = 0;
    *(uint64_t*)0x20000678 = 0;
    *(uint64_t*)0x20000680 = 0;
    *(uint64_t*)0x20000688 = 0;
    *(uint64_t*)0x20000690 = 0;
    *(uint64_t*)0x20000698 = 0;
    *(uint64_t*)0x200006a0 = 0;
    *(uint64_t*)0x200006a8 = 0;
    *(uint64_t*)0x200006b0 = 0;
    *(uint64_t*)0x200006b8 = 0;
    *(uint64_t*)0x200006c0 = 0;
    *(uint64_t*)0x200006c8 = 0;
    *(uint64_t*)0x200006d0 = 0;
    *(uint16_t*)0x200006d8 = 0;
    *(uint32_t*)0x200006dc = 0;
    *(uint32_t*)0x200006e0 = 0;
    *(uint64_t*)0x200006e8 = 0;
    *(uint16_t*)0x200006f0 = 0;
    *(uint32_t*)0x200006f4 = 0;
    *(uint32_t*)0x200006f8 = 0;
    *(uint64_t*)0x20000700 = 0;
    *(uint16_t*)0x20000708 = 0;
    *(uint32_t*)0x2000070c = 0;
    *(uint32_t*)0x20000710 = 0;
    *(uint64_t*)0x20000718 = 0;
    *(uint16_t*)0x20000720 = 0;
    *(uint32_t*)0x20000724 = 0;
    *(uint32_t*)0x20000728 = 0;
    *(uint64_t*)0x20000730 = 0;
    *(uint16_t*)0x20000738 = 0;
    *(uint32_t*)0x2000073c = 0;
    *(uint32_t*)0x20000740 = 0;
    *(uint64_t*)0x20000748 = 0;
    *(uint16_t*)0x20000750 = 0;
    *(uint32_t*)0x20000754 = 0;
    *(uint32_t*)0x20000758 = 0;
    *(uint64_t*)0x20000760 = 0;
    *(uint16_t*)0x20000768 = 0;
    *(uint32_t*)0x2000076c = 0;
    *(uint32_t*)0x20000770 = 0;
    *(uint64_t*)0x20000778 = 0;
    *(uint16_t*)0x20000780 = 0;
    *(uint32_t*)0x20000784 = 0;
    *(uint32_t*)0x20000788 = 0;
    *(uint64_t*)0x20000790 = 0;
    *(uint16_t*)0x20000798 = 0;
    *(uint32_t*)0x2000079c = 0;
    *(uint32_t*)0x200007a0 = 0;
    *(uint64_t*)0x200007a8 = 0;
    *(uint16_t*)0x200007b0 = 0;
    *(uint32_t*)0x200007b4 = 0;
    *(uint32_t*)0x200007b8 = 0;
    *(uint64_t*)0x200007c0 = 0;
    syscall(SYS_ioctl, r[0], 0xc5005601ul, 0x20000580ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  use_temporary_dir();
  loop();
  return 0;
}