// https://syzkaller.appspot.com/bug?id=3983f8a8d83851a54a0b9f9e75cb3464e9c70aef
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.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;                                          \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum,
                             const uint8_t* data, size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
            (uint8_t)a1, (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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) {
      exitf("opendir(%s) failed due to NOFILE, exiting");
    }
    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 test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[256];
    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");
      test();
      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 > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
    remove_dir(cwdbuf);
  }
}

long r[99];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    r[1] = syscall(__NR_socket, 0x2ul, 0x1ul, 0x0ul);
    break;
  case 2:
    memcpy((void*)0x2051fff3,
           "\x2f\x64\x65\x76\x2f\x6e\x65\x74\x2f\x74\x75\x6e\x00", 13);
    r[3] = syz_open_dev(0x2051fff3ul, 0x0ul, 0xaul);
    break;
  case 3:
    r[4] = syscall(__NR_fcntl, r[3], 0x0ul, r[3]);
    break;
  case 4:
    memcpy((void*)0x20a5afd8, "\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00",
           16);
    memcpy((void*)0x20a5afe8, "\x4f\x54\x00\x0c\xc0\xa1\xed\x4f\x3a\x0a"
                              "\x1f\xdc\x22\x20\x73\xb5",
           16);
    r[7] = syscall(__NR_ioctl, r[3], 0x400454caul, 0x20a5afd8ul);
    break;
  case 5:
    *(uint32_t*)0x20fc9ffc = (uint32_t)0x80000000;
    r[9] = syscall(__NR_ioctl, r[3], 0x400454d4ul, 0x20fc9ffcul);
    break;
  case 6:
    memcpy((void*)0x2062ffe0, "\x67\x72\x65\x30\x00\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x00\x00",
           16);
    *(uint16_t*)0x2062fff0 = (uint16_t)0x301;
    r[12] = syscall(__NR_ioctl, r[1], 0x8914ul, 0x2062ffe0ul);
    break;
  case 7:
    *(uint8_t*)0x205fa000 = (uint8_t)0x0;
    *(uint8_t*)0x205fa001 = (uint8_t)0x0;
    *(uint16_t*)0x205fa002 = (uint16_t)0x0;
    *(uint16_t*)0x205fa004 = (uint16_t)0x0;
    *(uint16_t*)0x205fa006 = (uint16_t)0x0;
    *(uint16_t*)0x205fa008 = (uint16_t)0x0;
    STORE_BY_BITMASK(uint8_t, 0x205fa00a, 0x7335, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x205fa00a, 0x6, 4, 4);
    memcpy((void*)0x205fa00b, "\x3b\x1d\x56", 3);
    *(uint16_t*)0x205fa00e = (uint16_t)0x3c00;
    *(uint8_t*)0x205fa010 = (uint8_t)0x3c;
    *(uint8_t*)0x205fa011 = (uint8_t)0x8;
    *(uint8_t*)0x205fa012 = (uint8_t)0xfe;
    *(uint8_t*)0x205fa013 = (uint8_t)0x80;
    *(uint8_t*)0x205fa014 = (uint8_t)0x0;
    *(uint8_t*)0x205fa015 = (uint8_t)0x0;
    *(uint8_t*)0x205fa016 = (uint8_t)0x0;
    *(uint8_t*)0x205fa017 = (uint8_t)0x0;
    *(uint8_t*)0x205fa018 = (uint8_t)0x0;
    *(uint8_t*)0x205fa019 = (uint8_t)0x0;
    *(uint8_t*)0x205fa01a = (uint8_t)0x0;
    *(uint8_t*)0x205fa01b = (uint8_t)0x0;
    *(uint8_t*)0x205fa01c = (uint8_t)0x0;
    *(uint8_t*)0x205fa01d = (uint8_t)0x0;
    *(uint8_t*)0x205fa01e = (uint8_t)0x0;
    *(uint8_t*)0x205fa01f = (uint8_t)0x0;
    *(uint8_t*)0x205fa020 = (uint8_t)0x0;
    *(uint8_t*)0x205fa021 = (uint8_t)0xbb;
    *(uint8_t*)0x205fa022 = (uint8_t)0xfe;
    *(uint8_t*)0x205fa023 = (uint8_t)0x80;
    *(uint8_t*)0x205fa024 = (uint8_t)0x0;
    *(uint8_t*)0x205fa025 = (uint8_t)0x0;
    *(uint8_t*)0x205fa026 = (uint8_t)0x0;
    *(uint8_t*)0x205fa027 = (uint8_t)0x0;
    *(uint8_t*)0x205fa028 = (uint8_t)0x0;
    *(uint8_t*)0x205fa029 = (uint8_t)0x0;
    *(uint8_t*)0x205fa02a = (uint8_t)0x0;
    *(uint8_t*)0x205fa02b = (uint8_t)0x0;
    *(uint8_t*)0x205fa02c = (uint8_t)0x0;
    *(uint8_t*)0x205fa02d = (uint8_t)0x0;
    *(uint8_t*)0x205fa02e = (uint8_t)0x0;
    *(uint8_t*)0x205fa02f = (uint8_t)0x0;
    *(uint8_t*)0x205fa030 = (uint8_t)0x0;
    *(uint8_t*)0x205fa031 = (uint8_t)0xbb;
    *(uint8_t*)0x205fa032 = (uint8_t)0x0;
    *(uint8_t*)0x205fa033 = (uint8_t)0xd2c2;
    *(uint8_t*)0x205fa034 = (uint8_t)0x100000000;
    STORE_BY_BITMASK(uint8_t, 0x205fa035, 0x8, 0, 1);
    STORE_BY_BITMASK(uint8_t, 0x205fa035, 0x5, 1, 2);
    STORE_BY_BITMASK(uint8_t, 0x205fa035, 0x6, 3, 5);
    *(uint32_t*)0x205fa036 = (uint32_t)0x65;
    *(uint16_t*)0x205fa03a = (uint16_t)0x224e;
    *(uint16_t*)0x205fa03c = (uint16_t)0x234e;
    *(uint32_t*)0x205fa03e = (uint32_t)0x42424242;
    *(uint32_t*)0x205fa042 = (uint32_t)0x42424242;
    STORE_BY_BITMASK(uint8_t, 0x205fa046, 0x4, 0, 1);
    STORE_BY_BITMASK(uint8_t, 0x205fa046, 0x0, 1, 3);
    STORE_BY_BITMASK(uint8_t, 0x205fa046, 0xd, 4, 4);
    *(uint8_t*)0x205fa047 = (uint8_t)0xc2;
    *(uint16_t*)0x205fa048 = (uint16_t)0x800;
    *(uint16_t*)0x205fa04a = (uint16_t)0x0;
    *(uint16_t*)0x205fa04c = (uint16_t)0x100;
    *(uint8_t*)0x205fa04e = (uint8_t)0x4;
    *(uint8_t*)0x205fa04f = (uint8_t)0x2;
    *(uint8_t*)0x205fa050 = (uint8_t)0x5;
    *(uint8_t*)0x205fa051 = (uint8_t)0x6;
    *(uint32_t*)0x205fa052 = (uint32_t)0x9000000;
    *(uint8_t*)0x205fa056 = (uint8_t)0x0;
    *(uint8_t*)0x205fa057 = (uint8_t)0x4;
    *(uint8_t*)0x205fa058 = (uint8_t)0x2;
    *(uint8_t*)0x205fa059 = (uint8_t)0x8;
    *(uint8_t*)0x205fa05a = (uint8_t)0xa;
    *(uint32_t*)0x205fa05b = (uint32_t)0x9000000;
    *(uint32_t*)0x205fa05f = (uint32_t)0x2000000;
    *(uint8_t*)0x205fa063 = (uint8_t)0xfe;
    *(uint8_t*)0x205fa064 = (uint8_t)0x2;
    *(uint8_t*)0x205fa065 = (uint8_t)0x4;
    *(uint8_t*)0x205fa066 = (uint8_t)0x2;
    *(uint8_t*)0x205fa067 = (uint8_t)0x3;
    *(uint8_t*)0x205fa068 = (uint8_t)0x3;
    *(uint8_t*)0x205fa069 = (uint8_t)0x0;
    *(uint8_t*)0x205fa06a = (uint8_t)0x3;
    *(uint8_t*)0x205fa06b = (uint8_t)0x3;
    *(uint8_t*)0x205fa06c = (uint8_t)0x1;
    struct csum_inet csum_97;
    csum_inet_init(&csum_97);
    csum_inet_update(&csum_97, (const uint8_t*)0x205fa012, 16);
    csum_inet_update(&csum_97, (const uint8_t*)0x205fa022, 16);
    uint32_t csum_97_chunk_2 = 0x34000000;
    csum_inet_update(&csum_97, (const uint8_t*)&csum_97_chunk_2, 4);
    uint32_t csum_97_chunk_3 = 0x6000000;
    csum_inet_update(&csum_97, (const uint8_t*)&csum_97_chunk_3, 4);
    csum_inet_update(&csum_97, (const uint8_t*)0x205fa03a, 52);
    *(uint16_t*)0x205fa04a = csum_inet_digest(&csum_97);
    r[98] = syscall(__NR_write, r[4], 0x205fa000ul, 0x6eul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[16];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 8; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 8; i++) {
    pthread_create(&th[8 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}