// https://syzkaller.appspot.com/bug?id=afa4898cbe5d437d11771f32581a02ceee828363
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <pthread.h>
#include <pwd.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 <time.h>
#include <unistd.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 {
  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 loop(void)
{
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  int i, call, thread;
  for (call = 0; call < 6; 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:
    //  socket$inet6_udp arguments: [
    //    domain: const = 0x1c (8 bytes)
    //    type: const = 0x2 (8 bytes)
    //    proto: const = 0x0 (1 bytes)
    //  ]
    //  returns sock_udp6
    res = syscall(SYS_socket, /*domain=*/0x1cul, /*type=*/2ul, /*proto=*/0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    //  thr_suspend arguments: [
    //    timeout: nil
    //  ]
    syscall(SYS_thr_suspend, /*timeout=*/0ul);
    break;
  case 2:
    //  setsockopt$inet6_int arguments: [
    //    fd: sock_in6 (resource)
    //    level: const = 0x29 (4 bytes)
    //    optname: inet6_option_types_int = 0x1b (4 bytes)
    //    optval: ptr[in, int32] {
    //      int32 = 0x0 (4 bytes)
    //    }
    //    optlen: len = 0x4 (8 bytes)
    //  ]
    *(uint32_t*)0x200000000240 = 0;
    syscall(SYS_setsockopt, /*fd=*/r[0], /*level=*/0x29,
            /*optname=IPV6_V6ONLY*/ 0x1b, /*optval=*/0x200000000240ul,
            /*optlen=*/4ul);
    break;
  case 3:
    //  sendto$inet6 arguments: [
    //    fd: sock_in6 (resource)
    //    buf: nil
    //    len: len = 0x0 (8 bytes)
    //    f: send_flags = 0x100 (8 bytes)
    //    addr: ptr[in, sockaddr_in6] {
    //      sockaddr_in6 {
    //        len: len = 0x1c (1 bytes)
    //        family: const = 0x1c (1 bytes)
    //        port: proc = 0x1 (2 bytes)
    //        flow: int32 = 0x7 (4 bytes)
    //        addr: union ipv6_addr {
    //          loopback: ipv6_addr_loopback {
    //            a0: const = 0x0 (8 bytes)
    //            a1: const = 0x1 (8 bytes)
    //          }
    //        }
    //        scope: int32 = 0x1 (4 bytes)
    //      }
    //    }
    //    addrlen: len = 0x1c (8 bytes)
    //  ]
    *(uint8_t*)0x200000000300 = 0x1c;
    *(uint8_t*)0x200000000301 = 0x1c;
    *(uint16_t*)0x200000000302 = htobe16(0x4e21);
    *(uint32_t*)0x200000000304 = 7;
    *(uint64_t*)0x200000000308 = htobe64(0);
    *(uint64_t*)0x200000000310 = htobe64(1);
    *(uint32_t*)0x200000000318 = 1;
    syscall(SYS_sendto, /*fd=*/r[0], /*buf=*/0ul, /*len=*/0ul,
            /*f=MSG_EOF*/ 0x100ul, /*addr=*/0x200000000300ul,
            /*addrlen=*/0x1cul);
    break;
  case 4:
    //  connect$inet6 arguments: [
    //    fd: sock_in6 (resource)
    //    addr: ptr[in, sockaddr_in6] {
    //      sockaddr_in6 {
    //        len: len = 0x1c (1 bytes)
    //        family: const = 0x1c (1 bytes)
    //        port: proc = 0x0 (2 bytes)
    //        flow: int32 = 0x2 (4 bytes)
    //        addr: union ipv6_addr {
    //          ipv4: ipv6_addr_ipv4 {
    //            a0: buffer: {00 00 00 00 00 00 00 00 00 00} (length 0xa)
    //            a1: buffer: {ff ff} (length 0x2)
    //            a3: union ipv4_addr {
    //              multicast2: const = 0xe0000002 (4 bytes)
    //            }
    //          }
    //        }
    //        scope: int32 = 0x0 (4 bytes)
    //      }
    //    }
    //    addrlen: len = 0x1c (8 bytes)
    //  ]
    *(uint8_t*)0x200000000040 = 0x1c;
    *(uint8_t*)0x200000000041 = 0x1c;
    *(uint16_t*)0x200000000042 = htobe16(0x4e20);
    *(uint32_t*)0x200000000044 = 2;
    memset((void*)0x200000000048, 0, 10);
    memset((void*)0x200000000052, 255, 2);
    *(uint32_t*)0x200000000054 = htobe32(0xe0000002);
    *(uint32_t*)0x200000000058 = 0;
    syscall(SYS_connect, /*fd=*/r[0], /*addr=*/0x200000000040ul,
            /*addrlen=*/0x1cul);
    break;
  case 5:
    //  write arguments: [
    //    fd: fd (resource)
    //    buf: nil
    //    count: len = 0x0 (8 bytes)
    //  ]
    syscall(SYS_write, /*fd=*/r[0], /*buf=*/0ul, /*count=*/0ul);
    break;
  }
}
int main(void)
{
  syscall(SYS_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x1012ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  loop();
  return 0;
}