// https://syzkaller.appspot.com/bug?id=534c3e964e6834c4ec17463f583965943a9ad68f
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.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);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    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();
      int fd;
      for (fd = 3; fd < 30; fd++)
        close(fd);
      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)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
    remove_dir(cwdbuf);
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (__atomic_load_n(&running, __ATOMIC_RELAXED))
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[4] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_getpgrp, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    syscall(__NR_clock_gettime, 5, 0x20000280);
    break;
  case 2:
    *(uint32_t*)0x200000c0 = 2;
    *(uint32_t*)0x200000c4 = 0x70;
    *(uint8_t*)0x200000c8 = 0xfd;
    *(uint8_t*)0x200000c9 = 0;
    *(uint8_t*)0x200000ca = 0;
    *(uint8_t*)0x200000cb = 0;
    *(uint32_t*)0x200000cc = 0;
    *(uint64_t*)0x200000d0 = 0;
    *(uint64_t*)0x200000d8 = 0;
    *(uint64_t*)0x200000e0 = 0;
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 5, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x200000e8, 0, 29, 35);
    *(uint32_t*)0x200000f0 = 0;
    *(uint32_t*)0x200000f4 = 0;
    *(uint64_t*)0x200000f8 = 0x20000000;
    *(uint64_t*)0x20000100 = 0;
    *(uint64_t*)0x20000108 = 0;
    *(uint64_t*)0x20000110 = 0;
    *(uint32_t*)0x20000118 = 0;
    *(uint32_t*)0x2000011c = 0;
    *(uint64_t*)0x20000120 = 0;
    *(uint32_t*)0x20000128 = 0;
    *(uint16_t*)0x2000012c = 0;
    *(uint16_t*)0x2000012e = 0;
    syscall(__NR_perf_event_open, 0x200000c0, r[0], 0, -1, 0);
    break;
  case 3:
    memcpy((void*)0x20000380, "/selinux/commit_pending_bools", 30);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000380, 1, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    syscall(__NR_ioctl, r[1], 0x5427);
    break;
  case 5:
    res = syscall(__NR_socket, 0xa, 2, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 6:
    res = syscall(__NR_socket, 0x18, 1, 1);
    if (res != -1)
      r[3] = res;
    break;
  case 7:
    *(uint16_t*)0x205fafd2 = 0x18;
    *(uint32_t*)0x205fafd4 = 1;
    *(uint32_t*)0x205fafd8 = 0;
    *(uint32_t*)0x205fafdc = r[2];
    *(uint16_t*)0x205fafe0 = 2;
    *(uint16_t*)0x205fafe2 = htobe16(0);
    *(uint32_t*)0x205fafe4 = htobe32(0xe0000002);
    *(uint8_t*)0x205fafe8 = 0;
    *(uint8_t*)0x205fafe9 = 0;
    *(uint8_t*)0x205fafea = 0;
    *(uint8_t*)0x205fafeb = 0;
    *(uint8_t*)0x205fafec = 0;
    *(uint8_t*)0x205fafed = 0;
    *(uint8_t*)0x205fafee = 0;
    *(uint8_t*)0x205fafef = 0;
    *(uint32_t*)0x205faff0 = 4;
    *(uint32_t*)0x205faff4 = 0;
    *(uint32_t*)0x205faff8 = 0;
    *(uint32_t*)0x205faffc = 0;
    syscall(__NR_connect, r[3], 0x205fafd2, 0x2e);
    break;
  case 8:
    *(uint32_t*)0x20000040 = 1;
    *(uint32_t*)0x20000044 = 0x70;
    *(uint8_t*)0x20000048 = 0;
    *(uint8_t*)0x20000049 = 0;
    *(uint8_t*)0x2000004a = 0;
    *(uint8_t*)0x2000004b = 0;
    *(uint32_t*)0x2000004c = 0;
    *(uint64_t*)0x20000050 = 0x50d;
    *(uint64_t*)0x20000058 = 0;
    *(uint64_t*)0x20000060 = 0;
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 0, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 1, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 2, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 3, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 4, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 5, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 6, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 7, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 8, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 9, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 10, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 11, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 12, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 13, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 14, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 15, 2);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 17, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 18, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 19, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 20, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 21, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 22, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 23, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 3, 24, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 25, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 26, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 27, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 28, 1);
    STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 29, 35);
    *(uint32_t*)0x20000070 = 0;
    *(uint32_t*)0x20000074 = 0;
    *(uint64_t*)0x20000078 = 0x20000000;
    *(uint64_t*)0x20000080 = 0;
    *(uint64_t*)0x20000088 = 0;
    *(uint64_t*)0x20000090 = 0;
    *(uint32_t*)0x20000098 = 0;
    *(uint32_t*)0x2000009c = 4;
    *(uint64_t*)0x200000a0 = 0;
    *(uint32_t*)0x200000a8 = 0;
    *(uint16_t*)0x200000ac = 0;
    *(uint16_t*)0x200000ae = 0;
    syscall(__NR_perf_event_open, 0x20000040, 0, 0, -1, 0);
    break;
  case 9:
    syscall(__NR_close, r[3]);
    break;
  }
}

void execute_one()
{
  execute(10);
}

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;
}