// https://syzkaller.appspot.com/bug?id=a133db4b32d89957481e21b5080f9edfa3bf4359
// 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/ioctl.h>
#include <sys/mount.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 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 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;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
retry:
  while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    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);
    while (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW))
        exit(1);
    }
  }
  closedir(dp);
  for (int i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

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");
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

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);
      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;
    }
    remove_dir(cwdbuf);
  }
}

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

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000000, "./file0\000", 8);
  syscall(__NR_mkdir, 0x20000000ul, 0ul);
  res = syscall(__NR_pipe2, 0x20000180ul, 0ul);
  if (res != -1) {
    r[0] = *(uint32_t*)0x20000180;
    r[1] = *(uint32_t*)0x20000184;
  }
  memcpy(
      (void*)0x20000400,
      "\x15\x09\x00\x00\x00\xff\xff\x5e\x32\xf8\x02\xdc\x53\xb2\x70\x95\xf3\x89"
      "\x88\x57\x3f\x3c\xe4\x38\x33\x3a\xb5\x45\xca\xc7\xf9\x6f\xa6\x53\xd0\x65"
      "\x96\x49\xe9\x58\x34\x4a\x9f\x9b\xca\xca\xa8\x6e\x70\x98\xc5\x58\x60\xbc"
      "\xf6\xb1\x28\x2d\xe1\x2c\xcf\x18\x91\x5f\x0f\xb7\x2b\x13\x1c\xc6\x7d\x73"
      "\x6f\xfb\x5c\xfa\x0a\x5f\x06\xbf\x12\x05\xc7\xca\x5f\xc2\x36\x73\x0b\xba"
      "\xaf\x50\xab\x86\x2e\xc3\xc8\x9e\x86\x7e\x4b\xc3\x3e\x4d\x3a\xb3\x8c\xb5"
      "\x25\x59\x5a\x1b\xfd\x6f\xcf\x70\xa1\x82\x25\xd7\x97\x9b\x90\xa7\x83\xea"
      "\x84\x0f\xde\xc8\x7e\xdd\x9e\x7a\x16\x5f\x29\xbd\x35\x8c\x93\xdb\x38\xc3"
      "\x5e\xb3\xc3\xc7\xf6\x82\xf9\xbf\x75\xfd\x1c\x23\x4c\x7c\xdf\xc0\x65\xfe"
      "\x2b\xa8\xb5\xbe\x8d\xb2\x26\x67\x17\xc3\x23\xa9\xda\xc8\x3e\x89\x51\x4d"
      "\x2c\xc3\x8b\x31\x55\x01\x11\x5d\xea\x6c\x9e\x9c\x30\x9f\x16\x87\xaf\x95"
      "\x3a\xdf\x68\xff\x40\x49\xdc\xab\x44\x04\xc8\xe7\x2b\x59\x51\xc1\x77\x32"
      "\x40\xd9\xc9\xf1\x6f\x89\x22\x5d\x51\x95\x6d\x2c\x72\x7c\x5f\x50\x53\x80"
      "\xed\x56\x82\x1e\x9d\x9c\xf3\x03\x3a\xb6\x76\xfd\xf6\x10\xa1\x36\xaf\x2c"
      "\xb3\xd3\x75\x14\x2e\xb7\x13\x48\x4d\x01\x1a\x9a\xb5\x6d\xb8\x74\xe5\x58"
      "\x41\xb3\xcb\xa1\x8e\xc2\xd1\x3b\xd6\xc5\xd0\x35\xe6\xf5\x4d\xaf\x78\x00"
      "\xf8\x19\x08\xca\x1f\xf2\x1d\x95\x21\x67\x24\x8d\xa3\xb4\x75\x6e\x3b\x97"
      "\xf9\xf4\x1a\xd0\x36\x28\xfc\xa3\xaa\x27\x30\x9b\x7d\x34\xbd\x78\x2b\x44"
      "\xd2\x0a\x90\x3b\x07\x76\xe7\x13\xf6\x20\x0c\xd9\xf8\x55\x50\x50\x48\x27"
      "\x1d\x68\x5e\x12\xff\x90\x64\xa5\x91\x65\xea\x5a\x6c\x84\xd2\x4b\x28\xde"
      "\x3b\x7b\x70\xb8\xb5\x41\xa7\x6b\xab\x2a\x85\x03\xae\x10\xe4\x54\x5d\x16"
      "\x44\x0c\x93\x9a\x67\xe6\x31\x6d\xe5\x0f\xdb\x0a\x25\x4a\xf2\xd1\x18\xa6"
      "\x49\x52\xec\xdd\x65\xc7\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\xd4\x49\x50\x3c\x3d\xb5\xcf\x8a\x25\x4e\x21\x59\xd3\x97\x9b\x2a\x3e\xa6"
      "\xce\xdb\xa2\xd0\x00\x51\x10\xa1\xb8\x01\x87\x4b\x0b\x2b\xed\x87\x88\x0c"
      "\xcd\x99\x89",
      453);
  syscall(__NR_write, r[1], 0x20000400ul, 0x15ul);
  res = syscall(__NR_dup, r[1]);
  if (res != -1)
    r[2] = res;
  memcpy((void*)0x20000040, "./file0\000", 8);
  memcpy((void*)0x200001c0, "9p\000", 3);
  memcpy((void*)0x20000080, "trans=fd,rfdno=", 15);
  sprintf((char*)0x2000008f, "0x%016llx", (long long)r[0]);
  memcpy((void*)0x200000a1, ",wfdno=", 7);
  sprintf((char*)0x200000a8, "0x%016llx", (long long)r[2]);
  syscall(__NR_mount, 0ul, 0x20000040ul, 0x200001c0ul, 0ul, 0x20000080ul);
}
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);
  use_temporary_dir();
  loop();
  return 0;
}