// https://syzkaller.appspot.com/bug?id=51dd2e2409ee2508e905ba9050685495a71fe84a
// 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 unsigned long long procid;

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);
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  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;
    }
    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);
    }
  }
  closedir(dp);
  int i;
  for (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) {
        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);
  int i;
  for (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");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; 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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

#ifndef __NR_sched_setattr
#define __NR_sched_setattr 314
#endif

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  memcpy((void*)0x20000040, "./bus\000", 6);
  res = syscall(__NR_open, 0x20000040ul, 0x17eul, 0ul);
  if (res != -1)
    r[0] = res;
  *(uint64_t*)0x20000280 = 9;
  *(uint64_t*)0x20000288 = 0x8d;
  syscall(__NR_prlimit64, 0, 0xeul, 0x20000280ul, 0ul);
  *(uint32_t*)0x20000080 = 0x38;
  *(uint32_t*)0x20000084 = 2;
  *(uint64_t*)0x20000088 = 0;
  *(uint32_t*)0x20000090 = 9;
  *(uint32_t*)0x20000094 = 3;
  *(uint64_t*)0x20000098 = 0;
  *(uint64_t*)0x200000a0 = 0;
  *(uint64_t*)0x200000a8 = 0;
  *(uint32_t*)0x200000b0 = 0;
  *(uint32_t*)0x200000b4 = 0;
  syscall(__NR_sched_setattr, 0, 0x20000080ul, 0ul);
  *(uint32_t*)0x2001d000 = 1;
  *(uint32_t*)0x2001d004 = 0x70;
  *(uint8_t*)0x2001d008 = 0;
  *(uint8_t*)0x2001d009 = 0;
  *(uint8_t*)0x2001d00a = 0;
  *(uint8_t*)0x2001d00b = 0;
  *(uint32_t*)0x2001d00c = 0;
  *(uint64_t*)0x2001d010 = 0x7f;
  *(uint64_t*)0x2001d018 = 0x34000;
  *(uint64_t*)0x2001d020 = 4;
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 5, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1);
  STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35);
  *(uint32_t*)0x2001d030 = 0;
  *(uint32_t*)0x2001d034 = 0;
  *(uint64_t*)0x2001d038 = 0;
  *(uint64_t*)0x2001d040 = 0;
  *(uint64_t*)0x2001d048 = 0;
  *(uint64_t*)0x2001d050 = 0;
  *(uint32_t*)0x2001d058 = 0;
  *(uint32_t*)0x2001d05c = 0;
  *(uint64_t*)0x2001d060 = 6;
  *(uint32_t*)0x2001d068 = 0;
  *(uint16_t*)0x2001d06c = 0;
  *(uint16_t*)0x2001d06e = 0;
  syscall(__NR_perf_event_open, 0x2001d000ul, 0, -1ul, -1, 0ul);
  syscall(__NR_write, r[0], 0x20000780ul, 0x38ul);
  *(uint64_t*)0x200001c0 = 0;
  syscall(__NR_sendfile, r[0], r[0], 0x200001c0ul, 0x8080fffffffeul);
}
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);
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}