// https://syzkaller.appspot.com/bug?id=9463343a39f66062536eca45450081f837781f88
// 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 <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 unsigned long long procid;

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)
{
  int i, call, thread;
  for (call = 0; call < 3; 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 (call == 1)
        break;
      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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      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, 0x1cul, 1ul, 0x84);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint8_t*)0x200000c0 = 0x1c;
    *(uint8_t*)0x200000c1 = 0x1c;
    *(uint16_t*)0x200000c2 = htobe16(0x4e22 + procid * 4);
    *(uint32_t*)0x200000c4 = 0;
    *(uint64_t*)0x200000c8 = htobe64(0);
    *(uint64_t*)0x200000d0 = htobe64(1);
    *(uint32_t*)0x200000d8 = 0;
    syscall(SYS_connect, r[0], 0x200000c0ul, 0x1cul);
    break;
  case 2:
    memcpy(
        (void*)0x20000d80,
        "\x16\x0d\xe4\xf9\xf0\xad\xa4\x14\xb4\x0e\x42\x6f\xc3\x63\x42\xc8\xe3"
        "\x71\xcb\x0f\x5e\xd1\xa1\x6a\xe2\x31\x4d\x26\x78\xf5\xfc\xdf\xac\xe7"
        "\x6e\x34\x87\x90\x8f\x04\x5d\x53\x9a\xdc\xb3\xf6\xee\xb8\x73\x25\xe3"
        "\x34\x23\xf2\x47\xc8\x04\x3b\x87\x60\x78\xef\x2c\x7e\xf5\x92\x33\xc4"
        "\x87\x64\xa5\xc2\x9d\xb2\x2e\x7b\xbe\x27\x75\xf4\xaf\x8a\xa8\xa3\x3f"
        "\x66\xf6\x0c\x84\xc6\xe4\x0f\x6a\x9c\x11\xce\x4a\x15\x07\x9f\x52\x93"
        "\xe9\x1c\x38\xb4\xa8\xa0\x70\xe7\x36\x48\x9a\x5a\x61\xbc\x1a\x73\x14"
        "\xe8\x75\x79\x50\x88\x17\x2f\xdb\x35\x44\x5f\x92\x1d\x82\x43\x19\xbf"
        "\x81\xf0\x84\xd1\x9e\x1c\xff\xc6\x85\xab\x6e\x9a\xba\x9d\x14\x50\x7d"
        "\x26\x08\x17\x83\x1a\x10\x9a\x0a\x86\x1c\x82\x90\x9d\x43\x29\xd7\xf8"
        "\x5b\x99\xdf\x7a\xc5\x51\xd3\x24\x8e\x81\x30\x4f\x1c\x72\xf3\x0a\xde"
        "\xdd\x31\x55\x1a\x8d\x41\xef\x04\xf4\x8f\x05\xbd\x7f\x3c\x9f\xd4\x8b"
        "\x3a\x25\xb6\xb2\x76\x3a\xe4\xf0\x01\xf3\xf5\x7a\xa9\x4b\x34\x0b\x35"
        "\xb4\xce\x47\x30\x81\x4e\x5b\xf8\x92\x1a\xfb\x04\xfa\xaf\x4f\xc1\xe9"
        "\x19\xd4\xbb\x0b\x7d\x34\x17\x71\x33\x15\xa0\x27\xe1\x88\xc1\xe3\xc6"
        "\xad\xe2\x44\xc7\x6c\x0a\xd0\x01\xcd\x2e\x6c\xce\xb7\x7a\x36\xe6\x8a"
        "\x94\xb7\x32\x84\xc1\x7a\x91\x15\xb7\xb7\x9f\xd3\x26\xd4\xb1\xc6\x3d"
        "\x89\xdf\x5a\x8d\xa5\x06\x22\x22\x5d\xf9\x6c\xfb\x47\x95\x81\x73\x79"
        "\x23\xca\x38\x1a\xac\xb8\xb5\xca\x67\xde\x65\x51\x90\x49\x2b\x3e\xea"
        "\xe4\x63\x2e\x0d\xc1\x3a\x20\xdc\x95\x52\xda\xb9\xfc\xbd\x2b\xc1\x6a"
        "\x22\x9e\xe1\x7b\x5e\x99\x4a\x9a\x38\xbb\x20\xe0\x63\x7b\x55\x93\x67"
        "\x3f\x79\x6a\xe7\x63\xc4\xce\xca\x25\x68\x78\x5c\x62\xbe\x38\xcb\xc3"
        "\xf2\x78\xca\x00\x82\xfb\xb2\xbc\x1c\x47\x8e\x7f\x64\xcb\xe1\x9e\xce"
        "\x18\xd2\x84\xb2\x17\xc2\xb6\x49",
        399);
    syscall(SYS_sendto, r[0], 0x20000d80ul, 0x18ful, 0x20108ul, 0ul, 0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul);
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}