// https://syzkaller.appspot.com/bug?id=624e3138de7b6ec7eb35a6e699b1324ab607918c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  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 kill_and_wait(int pid, int* status)
{
  kill(pid, SIGKILL);
  while (waitpid(-1, status, 0) != pid) {
  }
}

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  dp = opendir(dir);
  if (dp == NULL)
    exit(1);
  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))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    if (unlink(filename))
      exit(1);
  }
  closedir(dp);
  if (rmdir(dir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  int i;
  for (i = 0; i < 100; i++) {
    if (pthread_create(&th, &attr, fn, arg) == 0) {
      pthread_attr_destroy(&attr);
      return;
    }
    if (errno == EAGAIN) {
      usleep(50);
      continue;
    }
    break;
  }
  exit(1);
}

typedef struct {
  pthread_mutex_t mu;
  pthread_cond_t cv;
  int state;
} event_t;

static void event_init(event_t* ev)
{
  if (pthread_mutex_init(&ev->mu, 0))
    exit(1);
  if (pthread_cond_init(&ev->cv, 0))
    exit(1);
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  if (ev->state)
    exit(1);
  ev->state = 1;
  pthread_mutex_unlock(&ev->mu);
  pthread_cond_broadcast(&ev->cv);
}

static void event_wait(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  while (!ev->state)
    pthread_cond_wait(&ev->cv, &ev->mu);
  pthread_mutex_unlock(&ev->mu);
}

static int event_isset(event_t* ev)
{
  pthread_mutex_lock(&ev->mu);
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  pthread_mutex_lock(&ev->mu);
  for (;;) {
    if (ev->state)
      break;
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    pthread_cond_timedwait(&ev->cv, &ev->mu, &ts);
    now = current_time_ms();
    if (now - start > timeout)
      break;
  }
  int res = ev->state;
  pthread_mutex_unlock(&ev->mu);
  return res;
}

static void sandbox_common()
{
  if (setsid() == -1)
    exit(1);
  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
}

static void loop();

static int do_sandbox_none(void)
{
  sandbox_common();
  loop();
  return 0;
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

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 (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 14; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

#ifndef SYS_bind
#define SYS_bind 104
#endif
#ifndef SYS_getsockopt
#define SYS_getsockopt 118
#endif
#ifndef SYS_mmap
#define SYS_mmap 197
#endif
#ifndef SYS_open
#define SYS_open 5
#endif
#ifndef SYS_sendmsg
#define SYS_sendmsg 28
#endif
#ifndef SYS_socket
#define SYS_socket 394
#endif
#ifndef SYS_writev
#define SYS_writev 121
#endif

uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000040, "./file0\000", 8));
    syscall(SYS_open, 0x20000040ul, 0x615ul, 0ul);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000100ul, 2ul, 0ul);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    NONFAILING(*(uint64_t*)0x20000340 = 0x20000180);
    NONFAILING(*(uint64_t*)0x20000348 = 0x81700);
    syscall(SYS_writev, r[0], 0x20000340ul, 0x1000000000000013ul);
    break;
  case 3:
    res = syscall(SYS_socket, 2ul, 0ul, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 4:
    NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000100ul, 0x40000400000002c2ul, 1ul);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    NONFAILING(memcpy((void*)0x200002c0, "./file0\000", 8));
    res = syscall(SYS_open, 0x200002c0ul, 0x10000ul, 0x18bul);
    if (res != -1)
      r[3] = res;
    break;
  case 6:
    syscall(SYS_mmap, 0x20000000ul, 0x200000ul, 3ul, 0x10ul, r[3], 0ul, 0ul);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x200008c0 = 0);
    syscall(SYS_getsockopt, r[1], 0, 0, 0ul, 0x200008c0ul);
    break;
  case 8:
    NONFAILING(memcpy((void*)0x20000100, "./file0\000", 8));
    res = syscall(SYS_open, 0x20000100ul, 2ul, 0ul);
    if (res != -1)
      r[4] = res;
    break;
  case 9:
    NONFAILING(*(uint64_t*)0x20000340 = 0x20000180);
    NONFAILING(*(uint64_t*)0x20000348 = 0x81700);
    syscall(SYS_writev, r[4], 0x20000340ul, 0x1000000000000013ul);
    break;
  case 10:
    syscall(SYS_socket, 2ul, 0x10000000ul, 3);
    break;
  case 11:
    syscall(SYS_bind, -1, 0ul, 0ul);
    break;
  case 12:
    NONFAILING(*(uint64_t*)0x20000300 = 0);
    NONFAILING(*(uint32_t*)0x20000308 = 0);
    NONFAILING(*(uint64_t*)0x20000310 = 0x20000640);
    NONFAILING(*(uint64_t*)0x20000640 = 0x20000080);
    NONFAILING(*(uint64_t*)0x20000648 = 0);
    NONFAILING(*(uint64_t*)0x20000650 = 0);
    NONFAILING(*(uint64_t*)0x20000658 = 0);
    NONFAILING(*(uint64_t*)0x20000660 = 0);
    NONFAILING(*(uint64_t*)0x20000668 = 0);
    NONFAILING(*(uint64_t*)0x20000670 = 0x20000240);
    NONFAILING(*(uint64_t*)0x20000678 = 0);
    NONFAILING(*(uint64_t*)0x20000680 = 0x20000380);
    NONFAILING(memcpy(
        (void*)0x20000380,
        "\x2d\x1d\x18\xbc\xbc\xcd\x25\x74\x9f\x47\xb6\x7d\xbb\xdb\x9b\x4b\x2a"
        "\xd5\x59\x97\x17\x28\x3e\x2f\x23\x80\x8e\xf6\x33\x5b\x95\x72\xa9\xfb"
        "\x41\xc8\x3d\x06\xc8\x53\x0c\x90\x91\xf8\x95\xfc\x3c\xf1\x46\xc4\xdd"
        "\xeb\xe9\x4a\x60\xa1\x31\x11\x01\x4b\x16\x56\x7a\x20\xab\x81\x29\xbc"
        "\xec\xac\x1f\x89\xea\x55\x31\x87\x32\xa2\x3e\x16\x12\xa6\xd7\xee\x97"
        "\xc2\x57\x2d\xfb\x64\x4e\xd3\x9f\x79\x8c\x41\xa4\xca\xdd\xd8\xce\xd3"
        "\x0c\x69\xfb\x0b\xdb\x80\x37\xd3\x7b\xc3\xd1\x45\xbd\x7e\xf9\x1c\xc2"
        "\x71\x06\x58\x6f\x5b\x7c\xf3\xc6\x44\x04\x08\xab\x59\xe9\x02\x94\x20"
        "\xf2\x88\x47\xd8\x2c\xd0\x10\xbd\x98\xc7\x01\x01\x02\x02\x35\xea\x1e"
        "\x1c\x60\x8c\x88\x80\x43\x6c\x5c\x99\x11\xff\x11\xf5\xbd\x4e\x93\x0d"
        "\xfb\x82\x6b\x4a\xad\xce\x7f\xca\x7f\x38\x8c\xea\x23\x72\x04\xbd\x58"
        "\xbb\x90\x0e\xed\x3a\x73\x9b\x99\xec",
        196));
    NONFAILING(*(uint64_t*)0x20000688 = 0xc4);
    NONFAILING(*(uint64_t*)0x20000690 = 0x20000480);
    NONFAILING(*(uint64_t*)0x20000698 = 0);
    NONFAILING(*(uint64_t*)0x200006a0 = 0x20000540);
    NONFAILING(*(uint64_t*)0x200006a8 = 0);
    NONFAILING(*(uint64_t*)0x200006b0 = 0x200005c0);
    NONFAILING(memcpy((void*)0x200005c0,
                      "\x25\x2c\x7f\x37\xd5\x20\x7c\x59\x26\x14\x8b\x90\x8b\x65"
                      "\x2e\x3d\x7a\x65\x1f\x2b\x03\x56\x3a\x4e\xa6\x6e\x49\xa3"
                      "\xdc\xb8\xdb\xe8\xf0\xab\x9a\x93\xff\xfd\x25\x0b\xd9\x95"
                      "\x57\x6b\xf6\x0b\xc2\x84\x83\xad\x9c\x45\x15\xd8\x83\x03"
                      "\x62\x6c\x0d\x7d\xf9\x75\xde\x1c\xcd\xb4\x06\xfc\xdc\x4f"
                      "\x7c\xa2\x5a\xc5\xa4\xe5\x51\x82\x5d\xdc\x09\x26\xe1\xa5"
                      "\xc4\x58\x6c\x90\xd3\xa3",
                      90));
    NONFAILING(*(uint64_t*)0x200006b8 = 0x5a);
    NONFAILING(*(uint64_t*)0x20000318 = 8);
    NONFAILING(*(uint64_t*)0x20000320 = 0x200006c0);
    NONFAILING(*(uint64_t*)0x200006c0 = 0xf8);
    NONFAILING(*(uint32_t*)0x200006c8 = 1);
    NONFAILING(*(uint32_t*)0x200006cc = 7);
    NONFAILING(memcpy(
        (void*)0x200006d0,
        "\xad\x54\x1b\xaa\x1e\xc6\x89\x64\x50\xba\x95\xe9\xdc\x00\xd5\xfb\x7f"
        "\x4f\x71\xe3\x7a\xac\x55\x28\x6e\xe9\xf5\x47\xf3\x3a\xfc\xc5\xac\x7e"
        "\x37\x69\x75\x44\xea\x51\xac\x1e\x2d\xda\x0e\x6b\x3a\x4f\xeb\x52\x3b"
        "\x2a\x94\x3d\x89\x05\xb0\xd1\x6c\xc3\xd3\x2d\x56\xaa\xd0\x19\xe6\x73"
        "\x46\x2b\x1e\xad\x20\x77\x8f\xb6\xec\x85\xd6\x2a\xe6\x73\xdc\x66\x45"
        "\x1b\xc8\xe8\x75\x6f\x6a\xa2\xca\x79\x9a\xb8\xbb\xb7\xd3\x13\x4c\x10"
        "\xed\x2d\x22\xf0\x77\x58\xaa\x3f\x07\x7c\x08\xfc\x02\x2a\xbb\xc2\x37"
        "\xf9\x55\xe2\x5a\xc8\xba\xe8\xee\x2b\x01\xc2\x89\x13\x3c\x44\x1d\x21"
        "\x11\x01\xba\xfe\x93\xac\xc6\xf5\x9c\xd7\x52\xff\x4b\x9f\x13\x2f\x66"
        "\xcb\xee\xd3\x0a\x23\x9f\xe2\xe8\x46\x60\xa5\x81\xdd\xee\xc5\x9d\x00"
        "\x06\x7f\x15\x81\xcb\xf5\x13\x05\xa1\xfe\x41\x5c\xa0\x48\xfd\xf6\x3e"
        "\x7c\x67\x22\x61\xed\x75\x56\xae\x32\xf6\xca\xe7\x49\x14\x75\xfa\xf0"
        "\xbc\x8f\x51\x4e\x90\x33\x07\x5c\x01\xa2\x18\xc5\x8a\x8c\x03\xbb\x3a"
        "\x86\x68\x87\xdc\x40\x5c\x1e\xfc",
        229));
    NONFAILING(*(uint64_t*)0x20000328 = 0xf8);
    NONFAILING(*(uint32_t*)0x20000330 = 0);
    syscall(SYS_sendmsg, -1, 0x20000300ul, 0x400ul);
    break;
  case 13:
    NONFAILING(*(uint64_t*)0x20000340 = 0x20000180);
    NONFAILING(*(uint64_t*)0x20000348 = 0x81700);
    syscall(SYS_writev, r[2], 0x20000340ul, 0x1000000000000013ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      do_sandbox_none();
    }
  }
  sleep(1000000);
  return 0;
}