// https://syzkaller.appspot.com/bug?id=9f4513b41da4f8a2961128dacb661a43f4acc21f
// 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;
  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 {
  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_RELAXED))
      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;
  int collide = 0;
again:
  for (call = 0; call < 7; 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;
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  intptr_t res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0x10ul, 3ul, 0x14ul);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint64_t*)0x200031c0 = 0;
    *(uint32_t*)0x200031c8 = 0;
    *(uint64_t*)0x200031d0 = 0x20003180;
    *(uint64_t*)0x20003180 = 0x20003000;
    *(uint32_t*)0x20003000 = 0x38;
    *(uint16_t*)0x20003004 = 0x1403;
    *(uint16_t*)0x20003006 = 1;
    *(uint32_t*)0x20003008 = 0;
    *(uint32_t*)0x2000300c = 0;
    *(uint16_t*)0x20003010 = 9;
    *(uint16_t*)0x20003012 = 2;
    memcpy((void*)0x20003014, "syz1\000", 5);
    *(uint16_t*)0x2000301c = 8;
    *(uint16_t*)0x2000301e = 0x41;
    memcpy((void*)0x20003020, "siw\000", 4);
    *(uint16_t*)0x20003024 = 0x14;
    *(uint16_t*)0x20003026 = 0x33;
    memcpy((void*)0x20003028,
           "lo\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 16);
    *(uint64_t*)0x20003188 = 0x38;
    *(uint64_t*)0x200031d8 = 1;
    *(uint64_t*)0x200031e0 = 0;
    *(uint64_t*)0x200031e8 = 0;
    *(uint32_t*)0x200031f0 = 0;
    syscall(__NR_sendmsg, r[0], 0x200031c0ul, 0ul);
    break;
  case 2:
    *(uint64_t*)0x20000500 = 0;
    *(uint32_t*)0x20000508 = 0;
    *(uint64_t*)0x20000510 = 0x200004c0;
    *(uint64_t*)0x200004c0 = 0x20000000;
    memcpy((void*)0x20000000, "\x30\x00\x00\x00\x02\x07\x02\x00\x00\x00\x00\x00"
                              "\x00\x00\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00"
                              "\x18\x00\x01",
           27);
    *(uint64_t*)0x200004c8 = 1;
    *(uint64_t*)0x20000518 = 1;
    *(uint64_t*)0x20000520 = 0;
    *(uint64_t*)0x20000528 = 0;
    *(uint32_t*)0x20000530 = 0;
    syscall(__NR_sendmsg, -1, 0x20000500ul, 0ul);
    break;
  case 3:
    *(uint64_t*)0x20000200 = 0;
    *(uint32_t*)0x20000208 = 0;
    *(uint64_t*)0x20000210 = 0x200001c0;
    *(uint64_t*)0x200001c0 = 0x20000000;
    memcpy((void*)0x20000000, "\x28\x00\x00\x00\x4a\x00\x01", 7);
    *(uint64_t*)0x200001c8 = 1;
    *(uint64_t*)0x20000218 = 1;
    *(uint64_t*)0x20000220 = 0;
    *(uint64_t*)0x20000228 = 0;
    *(uint32_t*)0x20000230 = 0;
    syscall(__NR_sendmsg, -1, 0x20000200ul, 0ul);
    break;
  case 4:
    *(uint64_t*)0x20001f80 = 0;
    *(uint32_t*)0x20001f88 = 0;
    *(uint64_t*)0x20001f90 = 0x20001f40;
    *(uint64_t*)0x20001f40 = 0x20000000;
    memcpy((void*)0x20000000, "\x14\x00\x00\x00\x04\x14", 6);
    *(uint64_t*)0x20001f48 = 1;
    *(uint64_t*)0x20001f98 = 1;
    *(uint64_t*)0x20001fa0 = 0;
    *(uint64_t*)0x20001fa8 = 0;
    *(uint32_t*)0x20001fb0 = 0;
    syscall(__NR_sendmsg, -1, 0x20001f80ul, 0ul);
    break;
  case 5:
    res = syscall(__NR_socket, 0x10ul, 2ul, 0x14);
    if (res != -1)
      r[1] = res;
    break;
  case 6:
    memcpy((void*)0x20000000, "E", 1);
    syscall(__NR_sendto, r[1], 0x20000000ul, 0x10a73ul, 0x8c0ul, 0ul,
            0x4b6ae4f95a5de35bul);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  loop();
  return 0;
}