// https://syzkaller.appspot.com/bug?id=99c93fe134dff2646f15ff3c4b13a5623676e4b0
// 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>

#ifndef __NR_dup
#define __NR_dup 23
#endif
#ifndef __NR_mkdirat
#define __NR_mkdirat 34
#endif
#ifndef __NR_mknodat
#define __NR_mknodat 33
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_mount
#define __NR_mount 40
#endif
#ifndef __NR_pipe2
#define __NR_pipe2 59
#endif
#ifndef __NR_write
#define __NR_write 64
#endif

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*)0x20002040, "./file0\000", 8);
  syscall(__NR_mkdirat, 0xffffff9c, 0x20002040ul, 0ul);
  res = syscall(__NR_pipe2, 0x20000240ul, 0ul);
  if (res != -1) {
    r[0] = *(uint32_t*)0x20000240;
    r[1] = *(uint32_t*)0x20000244;
  }
  memcpy((void*)0x20000080,
         "\x15\x00\x00\x00\x65\xff\xff\x09\x7b\x00\x00\x08\x00\x39\x50\x32\x30"
         "\x30\x30\x2e",
         20);
  syscall(__NR_write, r[1], 0x20000080ul, 0x15ul);
  res = syscall(__NR_dup, r[1]);
  if (res != -1)
    r[2] = res;
  *(uint32_t*)0x20000100 = 0x18;
  *(uint32_t*)0x20000104 = 0;
  *(uint64_t*)0x20000108 = 0;
  *(uint64_t*)0x20000110 = 0;
  syscall(__NR_write, r[2], 0x20000100ul, 0x18ul);
  *(uint32_t*)0x20000bc0 = 0xb0;
  *(uint32_t*)0x20000bc4 = 0;
  *(uint64_t*)0x20000bc8 = 0;
  *(uint64_t*)0x20000bd0 = 0;
  *(uint64_t*)0x20000bd8 = 0;
  *(uint64_t*)0x20000be0 = 0;
  *(uint64_t*)0x20000be8 = 0;
  *(uint32_t*)0x20000bf0 = 0;
  *(uint32_t*)0x20000bf4 = 0;
  *(uint64_t*)0x20000bf8 = 0;
  *(uint64_t*)0x20000c00 = 0;
  *(uint64_t*)0x20000c08 = 0;
  *(uint64_t*)0x20000c10 = 0;
  *(uint64_t*)0x20000c18 = 0;
  *(uint64_t*)0x20000c20 = 0;
  *(uint32_t*)0x20000c28 = 0;
  *(uint32_t*)0x20000c2c = 0;
  *(uint32_t*)0x20000c30 = 0;
  *(uint32_t*)0x20000c34 = 0;
  *(uint32_t*)0x20000c38 = 0;
  *(uint32_t*)0x20000c3c = 0;
  *(uint32_t*)0x20000c40 = 0;
  *(uint32_t*)0x20000c44 = 0;
  *(uint32_t*)0x20000c48 = 0;
  *(uint32_t*)0x20000c4c = 0;
  *(uint64_t*)0x20000c50 = 0;
  *(uint64_t*)0x20000c58 = 0;
  *(uint32_t*)0x20000c60 = 3;
  *(uint32_t*)0x20000c64 = 0;
  memcpy((void*)0x20000c68, "9p\000", 3);
  syscall(__NR_write, r[2], 0x20000bc0ul, 0xb0ul);
  *(uint32_t*)0x200000c0 = 0x14c;
  *(uint32_t*)0x200000c4 = 5;
  *(uint64_t*)0x200000c8 = 0;
  *(uint64_t*)0x200000d0 = 0;
  *(uint64_t*)0x200000d8 = 0;
  *(uint64_t*)0x200000e0 = 0;
  *(uint32_t*)0x200000e8 = 0;
  *(uint32_t*)0x200000ec = 0;
  syscall(__NR_write, r[2], 0x200000c0ul, 0x137ul);
  memcpy((void*)0x20000040, "./file0\000", 8);
  memcpy((void*)0x20000b80, "9p\000", 3);
  memcpy((void*)0x20000400, "trans=fd,", 9);
  memcpy((void*)0x20000409, "rfdno", 5);
  *(uint8_t*)0x2000040e = 0x3d;
  sprintf((char*)0x2000040f, "0x%016llx", (long long)r[0]);
  *(uint8_t*)0x20000421 = 0x2c;
  memcpy((void*)0x20000422, "wfdno", 5);
  *(uint8_t*)0x20000427 = 0x3d;
  sprintf((char*)0x20000428, "0x%016llx", (long long)r[2]);
  *(uint8_t*)0x2000043a = 0x2c;
  *(uint8_t*)0x2000043b = 0;
  syscall(__NR_mount, 0ul, 0x20000040ul, 0x20000b80ul, 0ul, 0x20000400ul);
  memcpy((void*)0x20000040, "./file0/file0\000", 14);
  syscall(__NR_mknodat, 0xffffff9c, 0x20000040ul, 0x1200ul, 0);
}
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;
}