// https://syzkaller.appspot.com/bug?id=95b97b9a7a3c065d463930b72f9f678429eae50f
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

#define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type, bf_off, bf_len)                          \
  (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len)              \
  if ((bf_off) == 0 && (bf_len) == 0) {                                \
    *(type*)(addr) = (type)(val);                                      \
  } else {                                                             \
    type new_val = *(type*)(addr);                                     \
    new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len));             \
    new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off);  \
    *(type*)(addr) = new_val;                                          \
  }

struct csum_inet {
  uint32_t acc;
};

static void csum_inet_init(struct csum_inet* csum)
{
  csum->acc = 0;
}

static void csum_inet_update(struct csum_inet* csum,
                             const uint8_t* data, size_t length)
{
  if (length == 0)
    return;

  size_t i;
  for (i = 0; i < length - 1; i += 2)
    csum->acc += *(uint16_t*)&data[i];

  if (length & 1)
    csum->acc += (uint16_t)data[length - 1];

  while (csum->acc > 0xffff)
    csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16);
}

static uint16_t csum_inet_digest(struct csum_inet* csum)
{
  return ~csum->acc;
}

static void test();

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

long r[39];
void test()
{
  memset(r, -1, sizeof(r));
  r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                 0xfffffffffffffffful, 0x0ul);
  r[1] = syscall(__NR_socket, 0xaul, 0x80001ul, 0x0ul);
  memcpy((void*)0x20000000, "\xef\xad\x07\x00\x00\xa7", 6);
  *(uint8_t*)0x20000006 = (uint8_t)0x0;
  *(uint8_t*)0x20000007 = (uint8_t)0x0;
  *(uint8_t*)0x20000008 = (uint8_t)0x0;
  *(uint8_t*)0x20000009 = (uint8_t)0x0;
  *(uint8_t*)0x2000000a = (uint8_t)0x0;
  *(uint8_t*)0x2000000b = (uint8_t)0x0;
  *(uint16_t*)0x2000000c = (uint16_t)0x0;
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 0x5, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000e, 0x4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0x0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x2000000f, 0x0, 2, 6);
  *(uint16_t*)0x20000010 = (uint16_t)0x4800;
  *(uint16_t*)0x20000012 = (uint16_t)0x6400;
  *(uint16_t*)0x20000014 = (uint16_t)0x0;
  *(uint8_t*)0x20000016 = (uint8_t)0x0;
  *(uint8_t*)0x20000017 = (uint8_t)0x0;
  *(uint16_t*)0x20000018 = (uint16_t)0x0;
  *(uint32_t*)0x2000001a = (uint32_t)0x20000e0;
  *(uint32_t*)0x2000001e = (uint32_t)0xffffffff;
  *(uint16_t*)0x20000022 = (uint16_t)0x204e;
  *(uint16_t*)0x20000024 = (uint16_t)0x204e;
  *(uint8_t*)0x20000026 = (uint8_t)0x4;
  STORE_BY_BITMASK(uint8_t, 0x20000027, 0x1, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x20000027, 0x0, 4, 4);
  *(uint16_t*)0x20000028 = (uint16_t)0x0;
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 0, 1);
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 1, 4);
  STORE_BY_BITMASK(uint8_t, 0x2000002a, 0x0, 5, 3);
  memcpy((void*)0x2000002b, "\xd1\xc0\x0c", 3);
  *(uint8_t*)0x2000002e = (uint8_t)0x0;
  memcpy((void*)0x2000002f, "\x88\xe3\xfc", 3);
  memcpy((void*)0x20000032, "\xec\xf6\x3f\x14\x44\x19\x9d\xfa\x64\x99"
                            "\x14\xeb\x5a\xe3\xf3\x4d\xef\x70\xfd\xe5"
                            "\xd6\xfe\xa9\x29\xb7\x3f\x64\x45\x0b\x07"
                            "\x37\xb0\x0a\x09\x2c\x86",
         36);
  struct csum_inet csum_35;
  csum_inet_init(&csum_35);
  csum_inet_update(&csum_35, (const uint8_t*)0x2000001a, 4);
  csum_inet_update(&csum_35, (const uint8_t*)0x2000001e, 4);
  uint16_t csum_35_chunk_2 = 0x2100;
  csum_inet_update(&csum_35, (const uint8_t*)&csum_35_chunk_2, 2);
  uint16_t csum_35_chunk_3 = 0x1000;
  csum_inet_update(&csum_35, (const uint8_t*)&csum_35_chunk_3, 2);
  csum_inet_update(&csum_35, (const uint8_t*)0x20000022, 16);
  *(uint16_t*)0x20000028 = csum_inet_digest(&csum_35);
  struct csum_inet csum_36;
  csum_inet_init(&csum_36);
  csum_inet_update(&csum_36, (const uint8_t*)0x2000000e, 20);
  *(uint16_t*)0x20000018 = csum_inet_digest(&csum_36);
  r[38] = syscall(__NR_setsockopt, r[1], 0x0ul, 0x40ul, 0x20000000ul,
                  0x0ul);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}