// https://syzkaller.appspot.com/bug?id=757195710b3cfe529411282e0861cec7d6ef1c04
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void exitf(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                                  \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)                      \
  if ((bf_off) == 0 && (bf_len) == 0) {                                        \
    *(type*)(addr) = (type)(val);                                              \
  } else {                                                                     \
    type new_val = *(type*)(addr);                                             \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));                     \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);          \
    *(type*)(addr) = new_val;                                                  \
  }

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exitf("opendir(%s) failed due to NOFILE, exiting", dir);
    }
    exitf("opendir(%s) failed", dir);
  }
  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))
      exitf("lstat(%s) failed", filename);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exitf("unlink(%s) failed", filename);
      if (umount2(filename, MNT_DETACH))
        exitf("umount(%s) failed", filename);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exitf("umount(%s) failed", dir);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exitf("rmdir(%s) failed", dir);
  }
}

static void execute_one();
extern unsigned long long procid;

static void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      fail("failed to mkdir");
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      if (chdir(cwdbuf))
        fail("failed to chdir");
      execute_one();
      doexit(0);
    }

    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid) {
        break;
      }
      usleep(1000);
      if (current_time_ms() - start < 3 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
    remove_dir(cwdbuf);
  }
}

unsigned long long procid;
void execute_one()
{
  *(uint32_t*)0x20000180 = 2;
  *(uint32_t*)0x20000184 = 0x70;
  *(uint8_t*)0x20000188 = 0xe4;
  *(uint8_t*)0x20000189 = 0;
  *(uint8_t*)0x2000018a = 0;
  *(uint8_t*)0x2000018b = 0;
  *(uint32_t*)0x2000018c = 0;
  *(uint64_t*)0x20000190 = 0;
  *(uint64_t*)0x20000198 = 0;
  *(uint64_t*)0x200001a0 = 0;
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 0, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 1, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 2, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 3, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 4, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 5, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 6, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 7, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 8, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 9, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 10, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 11, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 12, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 13, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 14, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 15, 2);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 17, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 18, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 19, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 20, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 21, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 22, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 23, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 24, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 25, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 26, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 27, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 28, 1);
  STORE_BY_BITMASK(uint64_t, 0x200001a8, 0, 29, 35);
  *(uint32_t*)0x200001b0 = 0;
  *(uint32_t*)0x200001b4 = 0;
  *(uint64_t*)0x200001b8 = 0x20000000;
  *(uint64_t*)0x200001c0 = 0;
  *(uint64_t*)0x200001c8 = 0;
  *(uint64_t*)0x200001d0 = 0;
  *(uint32_t*)0x200001d8 = 0;
  *(uint32_t*)0x200001dc = 0;
  *(uint64_t*)0x200001e0 = 0;
  *(uint32_t*)0x200001e8 = 0;
  *(uint16_t*)0x200001ec = 0;
  *(uint16_t*)0x200001ee = 0;
  syscall(__NR_perf_event_open, 0x20000180, 0, 0, -1, 0);
  memcpy((void*)0x20000080, "./file0", 8);
  syscall(__NR_mkdir, 0x20000080, 0);
  memcpy((void*)0x20000140, "./file0", 8);
  memcpy((void*)0x20000200, "/", 2);
  memcpy((void*)0x20000280, "overlay", 8);
  syscall(__NR_mount, 0x20000140, 0x20000200, 0x20000280, 0x32, 0x20000300);
  memcpy((void*)0x20000100, "./file0", 8);
  memcpy((void*)0x20000240, "./file0", 8);
  memcpy((void*)0x200002c0, "ocfs2", 6);
  syscall(__NR_mount, 0x20000100, 0x20000240, 0x200002c0, 0x800, 0x20000300);
  memcpy((void*)0x20000000, "./file0", 8);
  memcpy((void*)0x20000040, "./file0", 8);
  memcpy((void*)0x200000c0, "binfmt_misc", 12);
  syscall(__NR_mount, 0x20000000, 0x20000040, 0x200000c0, 0, 0x20000180);
  syscall(__NR_socketpair, 1, 1, 0, 0x200003c0);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}