// https://syzkaller.appspot.com/bug?id=08d09127d5fca845e6d94dea344c5b758bc45615
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>

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 {
  int state;
} event_t;

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

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

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      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 loop(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);
      event_timedwait(&th->done, 50);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res = 0;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0x21ul, 2ul, 2);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint64_t*)0x20000000 = 0x20000080;
    *(uint16_t*)0x20000080 = 0x21;
    *(uint16_t*)0x20000082 = 0;
    *(uint16_t*)0x20000084 = 2;
    *(uint16_t*)0x20000086 = 0x1c;
    *(uint16_t*)0x20000088 = 2;
    *(uint16_t*)0x2000008a = htobe16(0x4e22);
    *(uint8_t*)0x2000008c = 0xac;
    *(uint8_t*)0x2000008d = 0x14;
    *(uint8_t*)0x2000008e = 0x14;
    *(uint8_t*)0x2000008f = 0x46;
    *(uint32_t*)0x20000008 = 0x80;
    *(uint64_t*)0x20000010 = 0x20001640;
    *(uint64_t*)0x20001640 = 0x20000040;
    memset((void*)0x20000040, 236, 1);
    *(uint64_t*)0x20001648 = 0x4600;
    *(uint64_t*)0x20000018 = 1;
    *(uint64_t*)0x20000020 = 0x20001a00;
    memcpy(
        (void*)0x20001a00,
        "\x18\x00\x00\x00\x00\x00\x00\x00\x10\x01\x00\x00\x01\x00\x00\x00\x7d"
        "\x95\xdf\x16\xa3\x9b\x1a\x6c\x90\x00\x00\x00\x00\x00\x00\x00\x01\x00"
        "\x00\x00\x04\x05\x00\x00\x2b\x24\xec\x10\x06\x4b\x6f\x2f\x01\x00\x01"
        "\x00\x71\x8a\xef\x93\x2f\x38\x89\xd1\xfd\xda\x5b\x00\x00\x00\x01\x86"
        "\x0f\x58\x78\xc3\x7f\xfe\x36\xe1\x16\x5d\x14\xd4\x35\xbe\x5b\x31\x7c"
        "\x6c\x81\x89\x76\x7d\x2f\x97\x87\x9f\x07\xa5\x15\xbb\x7c\x16\x9f\x46"
        "\x93\x3d\x93\x38\xf4\xab\x04\x83\x69\x6f\x61\x89\x88\xc5\x94\x47\x41"
        "\xaf\xe4\x03\x46\x13\x23\x11\x0f\x62\x05\x53\x94\x41\x21\x58\xe7\xa3"
        "\xad\xb1\x64\xd6\x41\xaa\x40\xd4\xab\x07\x7f\xe3\x42\x32\xaa\x8b\x31"
        "\x9d\x76\x66\xd0\x99\x8a\x61\xd7\xda\x0c\x86\xd7\x00\x00\x00\x10\x10",
        170);
    *(uint64_t*)0x20000028 = 0x10b8;
    *(uint32_t*)0x20000030 = 4;
    syscall(__NR_sendmsg, r[0], 0x20000000ul, 0ul);
    break;
  case 2:
    *(uint64_t*)0x20000000 = 0;
    *(uint32_t*)0x20000008 = 0;
    *(uint64_t*)0x20000010 = 0;
    *(uint64_t*)0x20000018 = 0;
    *(uint64_t*)0x20000020 = 0x20001a00;
    *(uint64_t*)0x20000028 = 0x10b8;
    *(uint32_t*)0x20000030 = 4;
    syscall(__NR_sendmsg, r[0], 0x20000000ul, 0x186ul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}