// https://syzkaller.appspot.com/bug?id=54f4ce6239e6e0d0d5583488421c6fa3ba7ed6b4
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

static void test();

void loop()
{
  while (1) {
    test();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int collide;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        if (collide && call % 2)
          break;
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

long r[1];
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xf85000, 3, 0x32, -1, 0);
    break;
  case 1:
    r[0] = syscall(__NR_socket, 0xf, 3, 2);
    break;
  case 2:
    *(uint64_t*)0x20f56000 = 0;
    *(uint32_t*)0x20f56008 = 0;
    *(uint64_t*)0x20f56010 = 0x208feff0;
    *(uint64_t*)0x20f56018 = 1;
    *(uint64_t*)0x20f56020 = 0;
    *(uint64_t*)0x20f56028 = 0;
    *(uint32_t*)0x20f56030 = 0;
    *(uint64_t*)0x208feff0 = 0x202fffa8;
    *(uint64_t*)0x208feff8 = 0x50;
    *(uint8_t*)0x202fffa8 = 2;
    *(uint8_t*)0x202fffa9 = 3;
    *(uint8_t*)0x202fffaa = 0;
    *(uint8_t*)0x202fffab = 9;
    *(uint16_t*)0x202fffac = 0xa;
    *(uint16_t*)0x202fffae = 0;
    *(uint32_t*)0x202fffb0 = 0;
    *(uint32_t*)0x202fffb4 = 0;
    *(uint16_t*)0x202fffb8 = 3;
    *(uint16_t*)0x202fffba = 6;
    *(uint8_t*)0x202fffbc = 0;
    *(uint8_t*)0x202fffbd = 0;
    *(uint16_t*)0x202fffbe = 0;
    *(uint16_t*)0x202fffc0 = 2;
    *(uint16_t*)0x202fffc2 = 0;
    *(uint32_t*)0x202fffc4 = htobe32(0xe0000001);
    *(uint8_t*)0x202fffc8 = 0;
    *(uint8_t*)0x202fffc9 = 0;
    *(uint8_t*)0x202fffca = 0;
    *(uint8_t*)0x202fffcb = 0;
    *(uint8_t*)0x202fffcc = 0;
    *(uint8_t*)0x202fffcd = 0;
    *(uint8_t*)0x202fffce = 0;
    *(uint8_t*)0x202fffcf = 0;
    *(uint16_t*)0x202fffd0 = 2;
    *(uint16_t*)0x202fffd2 = 1;
    *(uint32_t*)0x202fffd4 = 0;
    *(uint8_t*)0x202fffd8 = 0;
    *(uint8_t*)0x202fffd9 = 0;
    *(uint8_t*)0x202fffda = 0;
    *(uint8_t*)0x202fffdb = 2;
    *(uint32_t*)0x202fffdc = 0;
    *(uint16_t*)0x202fffe0 = 3;
    *(uint16_t*)0x202fffe2 = 5;
    *(uint8_t*)0x202fffe4 = 0;
    *(uint8_t*)0x202fffe5 = 0;
    *(uint16_t*)0x202fffe6 = 0;
    *(uint16_t*)0x202fffe8 = 2;
    *(uint16_t*)0x202fffea = 0;
    *(uint32_t*)0x202fffec = htobe32(0xe0000001);
    *(uint8_t*)0x202ffff0 = 0;
    *(uint8_t*)0x202ffff1 = 0;
    *(uint8_t*)0x202ffff2 = 0;
    *(uint8_t*)0x202ffff3 = 0;
    *(uint8_t*)0x202ffff4 = 0;
    *(uint8_t*)0x202ffff5 = 0;
    *(uint8_t*)0x202ffff6 = 0;
    *(uint8_t*)0x202ffff7 = 0;
    syscall(__NR_sendmsg, r[0], 0x20f56000, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(3);
  collide = 1;
  execute(3);
}

int main()
{
  for (;;) {
    loop();
  }
}