// https://syzkaller.appspot.com/bug?id=f1834e1735946170a8a3a4c85edb978e94bada81
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <errno.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 <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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);
}

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 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:
  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[84];
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, 0x26ul, 0x5ul, 0x0ul);
    break;
  case 2:
    NONFAILING(*(uint16_t*)0x20e1e000 = (uint16_t)0x26);
    NONFAILING(memcpy(
        (void*)0x20e1e002,
        "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        14));
    NONFAILING(*(uint32_t*)0x20e1e010 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20e1e014 = (uint32_t)0x0);
    NONFAILING(memcpy((void*)0x20e1e018,
                      "\x63\x72\x63\x33\x32\x63\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"
                      "\x00\x00\x00\x00",
                      64));
    r[7] = syscall(__NR_bind, r[1], 0x20e1e000ul, 0x58ul);
    break;
  case 3:
    NONFAILING(*(uint16_t*)0x20f3b000 = (uint16_t)0x26);
    NONFAILING(memcpy(
        (void*)0x20f3b002,
        "\x61\x65\x61\x64\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        14));
    NONFAILING(*(uint32_t*)0x20f3b010 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20f3b014 = (uint32_t)0x0);
    NONFAILING(memcpy((void*)0x20f3b018,
                      "\x72\x66\x63\x34\x31\x30\x36\x28\x67\x63\x6d\x28"
                      "\x61\x65\x73\x29\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",
                      64));
    r[13] = syscall(__NR_bind, r[1], 0x20f3b000ul, 0x58ul);
    break;
  case 4:
    r[14] =
        syscall(__NR_setsockopt, r[1], 0x117ul, 0x5ul, 0x0ul, 0x789ul);
    break;
  case 5:
    NONFAILING(*(uint16_t*)0x20333fa8 = (uint16_t)0x26);
    NONFAILING(memcpy(
        (void*)0x20333faa,
        "\x72\x6e\x67\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        14));
    NONFAILING(*(uint32_t*)0x20333fb8 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20333fbc = (uint32_t)0xfffffffffffffffc);
    NONFAILING(memcpy((void*)0x20333fc0,
                      "\x64\x72\x62\x67\x5f\x6e\x6f\x70\x72\x5f\x63\x74"
                      "\x72\x5f\x61\x65\x73\x31\x32\x38\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[20] = syscall(__NR_bind, r[1], 0x20333fa8ul, 0x10000004eul);
    break;
  case 6:
    NONFAILING(memcpy((void*)0x20890fec, "\x79\x73\x39\x76\xd8\xc3\x0a"
                                         "\x4a\xea\xd9\x60\xf2\xbd\x08"
                                         "\xcf\xe6\x27\x85\xce\x10",
                      20));
    r[22] = syscall(__NR_setsockopt, r[1], 0x117ul, 0x1ul, 0x20890fecul,
                    0x14ul);
    break;
  case 7:
    NONFAILING(*(uint16_t*)0x20a65000 = (uint16_t)0x26);
    NONFAILING(memcpy(
        (void*)0x20a65002,
        "\x61\x65\x61\x64\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        14));
    NONFAILING(*(uint32_t*)0x20a65010 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20a65014 = (uint32_t)0x0);
    NONFAILING(memcpy((void*)0x20a65018,
                      "\x67\x63\x6d\x28\x73\x65\x72\x70\x65\x6e\x74\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",
                      64));
    r[28] =
        syscall(__NR_bind, 0xfffffffffffffffful, 0x20a65000ul, 0x58ul);
    break;
  case 8:
    r[29] = syscall(__NR_accept, r[1], 0x0ul, 0x0ul);
    break;
  case 9:
    NONFAILING(*(uint64_t*)0x202fefc8 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x202fefd0 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x202fefd8 = (uint64_t)0x20985000);
    NONFAILING(*(uint64_t*)0x202fefe0 = (uint64_t)0x1);
    NONFAILING(*(uint64_t*)0x202fefe8 = (uint64_t)0x20632f70);
    NONFAILING(*(uint64_t*)0x202feff0 = (uint64_t)0x78);
    NONFAILING(*(uint32_t*)0x202feff8 = (uint32_t)0x1);
    NONFAILING(*(uint64_t*)0x20985000 = (uint64_t)0x206fdf9d);
    NONFAILING(*(uint64_t*)0x20985008 = (uint64_t)0xe);
    NONFAILING(memcpy(
        (void*)0x206fdf9d,
        "\x95\x76\xfb\x56\x78\xf4\xd8\xbb\x1b\x8c\x63\xa2\x29\xd9",
        14));
    NONFAILING(*(uint64_t*)0x20632f70 = (uint64_t)0x18);
    NONFAILING(*(uint32_t*)0x20632f78 = (uint32_t)0x117);
    NONFAILING(*(uint32_t*)0x20632f7c = (uint32_t)0x3);
    NONFAILING(*(uint32_t*)0x20632f80 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20632f88 = (uint64_t)0x18);
    NONFAILING(*(uint32_t*)0x20632f90 = (uint32_t)0x117);
    NONFAILING(*(uint32_t*)0x20632f94 = (uint32_t)0x3);
    NONFAILING(*(uint32_t*)0x20632f98 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20632fa0 = (uint64_t)0x18);
    NONFAILING(*(uint32_t*)0x20632fa8 = (uint32_t)0x117);
    NONFAILING(*(uint32_t*)0x20632fac = (uint32_t)0x3);
    NONFAILING(*(uint32_t*)0x20632fb0 = (uint32_t)0x1);
    NONFAILING(*(uint64_t*)0x20632fb8 = (uint64_t)0x18);
    NONFAILING(*(uint32_t*)0x20632fc0 = (uint32_t)0x117);
    NONFAILING(*(uint32_t*)0x20632fc4 = (uint32_t)0x4);
    NONFAILING(*(uint32_t*)0x20632fc8 = (uint32_t)0x100000000);
    NONFAILING(*(uint64_t*)0x20632fd0 = (uint64_t)0x18);
    NONFAILING(*(uint32_t*)0x20632fd8 = (uint32_t)0x117);
    NONFAILING(*(uint32_t*)0x20632fdc = (uint32_t)0x4);
    NONFAILING(*(uint32_t*)0x20632fe0 = (uint32_t)0x3);
    r[60] = syscall(__NR_sendmsg, r[29], 0x202fefc8ul, 0x1ul);
    break;
  case 10:
    NONFAILING(*(uint64_t*)0x2094ffc8 = (uint64_t)0x20967000);
    NONFAILING(*(uint32_t*)0x2094ffd0 = (uint32_t)0x27);
    NONFAILING(*(uint64_t*)0x2094ffd8 = (uint64_t)0x20203000);
    NONFAILING(*(uint64_t*)0x2094ffe0 = (uint64_t)0x7);
    NONFAILING(*(uint64_t*)0x2094ffe8 = (uint64_t)0x207dafc6);
    NONFAILING(*(uint64_t*)0x2094fff0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2094fff8 = (uint32_t)0x8);
    NONFAILING(*(uint64_t*)0x20203000 = (uint64_t)0x20aa0f41);
    NONFAILING(*(uint64_t*)0x20203008 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20203010 = (uint64_t)0x20732000);
    NONFAILING(*(uint64_t*)0x20203018 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20203020 = (uint64_t)0x204c2f17);
    NONFAILING(*(uint64_t*)0x20203028 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20203030 = (uint64_t)0x205af000);
    NONFAILING(*(uint64_t*)0x20203038 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20203040 = (uint64_t)0x203d8000);
    NONFAILING(*(uint64_t*)0x20203048 = (uint64_t)0xf7);
    NONFAILING(*(uint64_t*)0x20203050 = (uint64_t)0x20823f4a);
    NONFAILING(*(uint64_t*)0x20203058 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20203060 = (uint64_t)0x20fa1000);
    NONFAILING(*(uint64_t*)0x20203068 = (uint64_t)0x0);
    r[82] = syscall(__NR_recvmsg, r[29], 0x2094ffc8ul, 0x3ul);
    break;
  case 11:
    r[83] = syscall(__NR_accept, r[1], 0x0ul, 0x0ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[24];

  memset(r, -1, sizeof(r));
  for (i = 0; i < 12; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    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;
}