// https://syzkaller.appspot.com/bug?id=9fcc32fe46ce159d6a3e64b64ab3402a7ac2e9b8
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <errno.h>
#include <errno.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <string.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>

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  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);
}

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

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
  for (;;) {
  }
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                \
  {                                                                    \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
    if (_setjmp(segv_env) == 0) {                                      \
      __VA_ARGS__;                                                     \
    }                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);               \
  }

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:
  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 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 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[41];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x20e7af88 = (uint32_t)0x1);
    NONFAILING(*(uint32_t*)0x20e7af8c = (uint32_t)0x78);
    NONFAILING(*(uint8_t*)0x20e7af90 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7af91 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7af92 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7af93 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7af94 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7af98 = (uint64_t)0x6);
    NONFAILING(*(uint64_t*)0x20e7afa0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afa8 = (uint64_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7afb0 = (uint8_t)0xd34);
    NONFAILING(*(uint8_t*)0x20e7afb1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7afb2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20e7afb3 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7afb4 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7afb8 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7afbc = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afc0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afc8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afd0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afd8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7afe0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7afe8 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20e7aff0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x20e7aff8 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x20e7affc = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x20e7affe = (uint16_t)0x0);
    r[28] = syscall(__NR_perf_event_open, 0x20e7af88ul, 0x0ul,
                    0xfffffffful, 0xfffffffffffffffful, 0x0ul);
    break;
  case 2:
    r[29] = syscall(__NR_fcntl, 0xfffffffffffffffful, 0x0ul,
                    0xfffffffffffffffful);
    break;
  case 3:
    r[30] = syscall(__NR_socket, 0x26ul, 0x5ul, 0x0ul);
    break;
  case 4:
    NONFAILING(*(uint16_t*)0x20037fa8 = (uint16_t)0x26);
    NONFAILING(memcpy(
        (void*)0x20037faa,
        "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        14));
    NONFAILING(*(uint32_t*)0x20037fb8 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20037fbc = (uint32_t)0x0);
    NONFAILING(memcpy((void*)0x20037fc0,
                      "\x68\x6d\x61\x63\x28\x73\x68\x61\x31\x29\x00\x00"
                      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                      "\x00\x00\x00\x00",
                      64));
    r[36] = syscall(__NR_bind, r[30], 0x20037fa8ul, 0x58ul);
    break;
  case 5:
    NONFAILING(memcpy(
        (void*)0x20ed2000,
        "\x3f\xd2\x34\x16\x1b\xd9\xf9\xd9\xa6\x9d\xc2\x14\x02\x4e\x01"
        "\xb5\x58\x0e\x9a\x76\xca\xbe\xe1\x54\x3b\x00\x00\x00\xcc\x9d"
        "\x2b\x9e\x71\x9a\xb4\xde\xea\x29\xb3\x45\x02\x24\x6a\x0d\x72"
        "\x34\x6b\x1a\xac\x07\xf0\x7f\x07\xbb\x00\x86\xdc\xce\x82\x8a"
        "\xf7\x2c\x47\x54\x2f\x1f\x7c\x4b\xb8\x62\x71\x49\x79\x13\x99"
        "\xcb\x1b\xad\x73\x3e\x0d\x2e\x2f\xff\x44\xbe\xc7\x3b\x62\x5d"
        "\x4c\x63\xe8\x69\x00\xc6\x25\x51\xe7\x83\xaa\xe2\x7d\x60\xca"
        "\xf7\xa6\xcd\xf0\x88\xc1\x10\x68\xdf\xd9\xe4\xde\xfc\xb0\xc8"
        "\x4e\x33\x8f\xc4\x6e\x66\x95\xf0\x08\x8a\x75\x57\x18\x58\xac"
        "\xf7\xb1\x81\x99\x56\xdd\xd6\x5b\xb7\x86\x63\x73\xcc\x0c\x79"
        "\x24\x12\xd2\x97\xc2\x89\x5f\x91\x7b\x82\x86\x1f\xc8\xbb\x0c"
        "\x8b\xdc\xb2\xf8\x66\x95\xd6\xbe\xca\xe0\xfd\xb3\x14\xca\xb1"
        "\x85\x9f\x8a\x71\xe0\x77",
        186));
    r[38] = syscall(__NR_setsockopt, r[30], 0x117ul, 0x1ul,
                    0x20ed2000ul, 0xbaul);
    break;
  case 6:
    NONFAILING(memcpy((void*)0x2043fff7,
                      "\x2f\x64\x65\x76\x2f\x6b\x76\x6d\x00", 9));
    r[40] = syscall(__NR_openat, 0xffffffffffffff9cul, 0x2043fff7ul,
                    0x1ul, 0x0ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[14];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 7; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 7; i++) {
    pthread_create(&th[7 + 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) {
      install_segv_handler();
      use_temporary_dir();
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}