// https://syzkaller.appspot.com/bug?id=dc1cf7f9e9ed12cddfb5570ea6101de5613ac702
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <sys/types.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/endian.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (sig == SIGBUS)
    valid = 1;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 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 = 0;
  for (; 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;
}

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)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 2; 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);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

static void execute_one(void);

#define WAIT_FLAGS 0

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    res = syscall(SYS_socket, /*domain=AF_APPLETALK|AF_UNIX*/ 0x11ul,
                  /*type=SOCK_RAW*/ 3ul, /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(memcpy(
        (void*)0x20000500,
        "\x94\x01\x05\x0e\x00\x00\x00\x00\x00\x00\x00\x27\x97\x88\x8f\xd1\xf8"
        "\x38\xa3\x11\x00\x00\x00\x00\x00\x00\xb1\x38\x86\xca\x38\x49\x45\x1a"
        "\xe3\xc3\x05\x10\x20\x74\x10\x38\xf5\x53\x85\x51\xf3\x0c\xe3\x90\x50"
        "\x0e\x08\xfe\xce\xa1\x1e\xa8\xfe\xf9\x6e\x4f\xc7\x48\xe9\x3f\x0b\x78"
        "\x04\x86\xae\xbd\xbe\x78\x1e\x4d\x8f\x5e\xef\x91\x87\xa8\x69\xa4\xd3"
        "\xa4\xcb\xba\x98\x2f\xd8\x25\x58\x2f\xe2\x23\xed\x00\xf4\xc8\xb2\xca"
        "\x3e\xbb\xc2\x59\x69\x9a\x1f\x13\x2e\x27\xac\xb5\xd6\x29\x34\xe4\xfd"
        "\x89\x07\x00\x00\x00\x00\x00\x00\x00\x70\xc1\xf5\xa8\x72\xc8\x8d\xff"
        "\x7c\xc5\x3c\x89\x43\x03\xb2\xa0\xa8\x5f\xf3\xfa\xa8\x00\x00\x00\x00"
        "\x00\x9e\xc7\xab\x3a\x34\xc2\x90\x00\x00\x00\x00\x00\x00\x00\x00\x00"
        "\x00\x00\x00\x00\x00\x2d\x7e\x4a\x5d\x76\xcc\x3f\x9c\xff\x2e\xd2\x24"
        "\x3e\x56\xfa\x27\x76\x03\xc5\xcc\x1e\x04\x73\x26\xbc\xf6\xb6\x7b\x75"
        "\xd0\x0b\xf6\xee\x33\x0b\x6a\x80\x87\x4b\x70\x55\x9d\x99\x75\xeb\xd1"
        "\x3d\xa2\x44\x7a\x78\xaa\x4b\x00\xcd\x0b\xa1\x87\x02\x15\x60\x7b\xb9"
        "\x12\xe3\xd7\x32\x51\x83\xce\x69\x45\x6b\x4b\x6c\xa9\x27\x87\x1c\x81"
        "\x67\x2a\x54\xec\x69\x5c\x5b\xde\xb8\x42\x83\x66\x56\xf9\x17\x94\x5c"
        "\xc0\x76\xf8\x7d\xc7\x14\xdf\xe0\xaa\x29\x47\x25\x2d\xf3\x50\x70\x7b"
        "\x22\x88\x4a\x77\x30\xcb\x6d\xba\x87\x42\x11\x0f\xbe\x9e\xc7\x48\x18"
        "\x85\x27\x43\x87\xe0\xb1\xdb\xe5\x69\x51\x22\x60\x48\x19\xb0\xb2\x29"
        "\x4b\x7b\x20\x72\x6a\x5d\x4f\xcb\x44\xf6\x2d\x00\xfa\xbb\x2f\x24\x7a"
        "\x16\x6d\x8d\x79\xd0\x5b\x8c\xc3\x70\xf5\xc1\x1d\xb5\x8a\xed\xca\x63"
        "\x2a\x83\xac\xd5\x8f\xf0\xea\x0a\x3d\xca\x58\xcc\xb0\x3c\xce\x46\x6c"
        "\xda\x73\x50\x17\x19\x6f\xf3\x46\xc3\x27\x17\x39\x7d\x6e\xc6\x95\x2e"
        "\xc9\x0d\xe8\x1e\xd2\x97\xb2\x50\x9e\x13\x0f\x00\x00",
        404));
    syscall(SYS_sendto, /*fd=*/r[0], /*buf=*/0x20000500ul, /*len=*/0x194ul,
            /*f=*/0ul, /*addr=*/0ul, /*addrlen=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  loop();
  return 0;
}