// https://syzkaller.appspot.com/bug?id=660cabc1b8bdb5a0a68e37cc37ed4c9229199e9e
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#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 execute_one();
extern unsigned long long procid;

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

void execute_one()
{
  *(uint8_t*)0x200000c0 = -1;
  *(uint8_t*)0x200000c1 = -1;
  *(uint8_t*)0x200000c2 = -1;
  *(uint8_t*)0x200000c3 = -1;
  *(uint8_t*)0x200000c4 = -1;
  *(uint8_t*)0x200000c5 = -1;
  *(uint8_t*)0x200000c6 = 0xaa;
  *(uint8_t*)0x200000c7 = 0xaa;
  *(uint8_t*)0x200000c8 = 0xaa;
  *(uint8_t*)0x200000c9 = 0xaa;
  *(uint8_t*)0x200000ca = 0xaa;
  *(uint8_t*)0x200000cb = 0xbb;
  *(uint16_t*)0x200000cc = htobe16(0x800);
  STORE_BY_BITMASK(uint8_t, 0x200000ce, 4, 0, 4);
  STORE_BY_BITMASK(uint8_t, 0x200000ce, 4, 4, 4);
  STORE_BY_BITMASK(uint8_t, 0x200000cf, 0, 0, 2);
  STORE_BY_BITMASK(uint8_t, 0x200000cf, 0, 2, 6);
  *(uint16_t*)0x200000d0 = htobe16(0x1c);
  *(uint16_t*)0x200000d2 = htobe16(0);
  *(uint16_t*)0x200000d4 = htobe16(0);
  *(uint8_t*)0x200000d6 = 0;
  *(uint8_t*)0x200000d7 = 0;
  *(uint16_t*)0x200000d8 = 0;
  *(uint32_t*)0x200000da = htobe32(0x7f000001);
  *(uint8_t*)0x200000de = 0xac;
  *(uint8_t*)0x200000df = 0x14;
  *(uint8_t*)0x200000e0 = 0x14;
  *(uint8_t*)0x200000e1 = 0xbb;
  *(uint16_t*)0x200000e2 = htobe16(0);
  *(uint16_t*)0x200000e4 = htobe16(0);
  *(uint16_t*)0x200000e6 = htobe16(8);
  *(uint16_t*)0x200000e8 = 0;
  *(uint32_t*)0x20000000 = 0;
  *(uint32_t*)0x20000004 = 0;
  *(uint32_t*)0x20000008 = 0;
  *(uint32_t*)0x2000000c = 0;
  *(uint32_t*)0x20000010 = 0;
  *(uint32_t*)0x20000014 = 0;
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  csum_inet_update(&csum_1, (const uint8_t*)0x200000da, 4);
  csum_inet_update(&csum_1, (const uint8_t*)0x200000de, 4);
  uint16_t csum_1_chunk_2 = 0x1100;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
  uint16_t csum_1_chunk_3 = 0x800;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
  csum_inet_update(&csum_1, (const uint8_t*)0x200000e2, 8);
  *(uint16_t*)0x200000e8 = csum_inet_digest(&csum_1);
  struct csum_inet csum_2;
  csum_inet_init(&csum_2);
  csum_inet_update(&csum_2, (const uint8_t*)0x200000ce, 20);
  *(uint16_t*)0x200000d8 = csum_inet_digest(&csum_2);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (;;) {
    loop();
  }
}