// https://syzkaller.appspot.com/bug?id=7c7bd742d3b6b7473427759ad255c581dbd94412
// 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>

#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();
  }
}

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;
      }
    }
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 366
#endif
#ifndef __NR_dup
#define __NR_dup 41
#endif
#ifndef __NR_sendto
#define __NR_sendto 369
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 370
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[2];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    r[0] = syscall(__NR_socket, 2, 1, 0);
    break;
  case 2:
    *(uint32_t*)0x2039c000 = 1;
    syscall(__NR_setsockopt, r[0], 6, 0x13, 0x2039c000, 0xffffffb8);
    break;
  case 3:
    *(uint32_t*)0x20383000 = 1;
    syscall(__NR_setsockopt, r[0], 6, 0x14, 0x20383000, 4);
    break;
  case 4:
    r[1] = syscall(__NR_dup, r[0]);
    break;
  case 5:
    *(uint16_t*)0x20e45ff0 = 2;
    *(uint16_t*)0x20e45ff2 = 0;
    *(uint32_t*)0x20e45ff4 = htobe32(0x7f000001);
    *(uint8_t*)0x20e45ff8 = 0;
    *(uint8_t*)0x20e45ff9 = 0;
    *(uint8_t*)0x20e45ffa = 0;
    *(uint8_t*)0x20e45ffb = 0;
    *(uint8_t*)0x20e45ffc = 0;
    *(uint8_t*)0x20e45ffd = 0;
    *(uint8_t*)0x20e45ffe = 0;
    *(uint8_t*)0x20e45fff = 0;
    syscall(__NR_sendto, r[0], 0x20482000, 0xffffff56, 0x20000401, 0x20e45ff0,
            0x10);
    break;
  case 6:
    *(uint32_t*)0x20789fc8 = 0x20ca4ff4;
    *(uint32_t*)0x20789fcc = 0xc;
    *(uint32_t*)0x20789fd0 = 0x20126000;
    *(uint32_t*)0x20789fd4 = 1;
    *(uint32_t*)0x20789fd8 = 0;
    *(uint32_t*)0x20789fdc = 0;
    *(uint32_t*)0x20789fe0 = 0;
    *(uint16_t*)0x20ca4ff4 = 0x10;
    *(uint16_t*)0x20ca4ff6 = 0;
    *(uint32_t*)0x20ca4ff8 = 0;
    *(uint32_t*)0x20ca4ffc = 0;
    *(uint32_t*)0x20126000 = 0x209ebfa0;
    *(uint32_t*)0x20126004 = 0x4c;
    *(uint32_t*)0x209ebfa0 = 0x4c;
    *(uint16_t*)0x209ebfa4 = 0x20;
    *(uint16_t*)0x209ebfa6 = 0;
    *(uint32_t*)0x209ebfa8 = 0;
    *(uint32_t*)0x209ebfac = 0;
    *(uint8_t*)0x209ebfb0 = 0;
    *(uint32_t*)0x209ebfb4 = htobe32(-1);
    *(uint8_t*)0x209ebfc4 = 0xfe;
    *(uint8_t*)0x209ebfc5 = 0x80;
    *(uint8_t*)0x209ebfc6 = 0;
    *(uint8_t*)0x209ebfc7 = 0;
    *(uint8_t*)0x209ebfc8 = 0;
    *(uint8_t*)0x209ebfc9 = 0;
    *(uint8_t*)0x209ebfca = 0;
    *(uint8_t*)0x209ebfcb = 0;
    *(uint8_t*)0x209ebfcc = 0;
    *(uint8_t*)0x209ebfcd = 0;
    *(uint8_t*)0x209ebfce = 0;
    *(uint8_t*)0x209ebfcf = 0;
    *(uint8_t*)0x209ebfd0 = 0;
    *(uint8_t*)0x209ebfd1 = 0;
    *(uint8_t*)0x209ebfd2 = 0;
    *(uint8_t*)0x209ebfd3 = 0xbb;
    *(uint16_t*)0x209ebfd4 = 0;
    *(uint16_t*)0x209ebfd6 = htobe16(0);
    *(uint16_t*)0x209ebfd8 = 0;
    *(uint16_t*)0x209ebfda = htobe16(0);
    *(uint16_t*)0x209ebfdc = 0;
    *(uint8_t*)0x209ebfde = 0;
    *(uint8_t*)0x209ebfdf = 0;
    *(uint8_t*)0x209ebfe0 = 0;
    *(uint32_t*)0x209ebfe4 = 0;
    *(uint32_t*)0x209ebfe8 = 0;
    syscall(__NR_sendmsg, r[1], 0x20789fc8, 0);
    break;
  case 7:
    *(uint8_t*)0x20001000 = 0xaa;
    *(uint8_t*)0x20001001 = 0xaa;
    *(uint8_t*)0x20001002 = 0xaa;
    *(uint8_t*)0x20001003 = 0xaa;
    *(uint8_t*)0x20001004 = 0;
    *(uint8_t*)0x20001005 = 0xaa;
    *(uint8_t*)0x20001006 = 0xaa;
    *(uint8_t*)0x20001007 = 0xaa;
    *(uint8_t*)0x20001008 = 0xaa;
    *(uint8_t*)0x20001009 = 0xaa;
    *(uint8_t*)0x2000100a = 0;
    *(uint8_t*)0x2000100b = 0;
    *(uint16_t*)0x2000100c = htobe16(0x800);
    STORE_BY_BITMASK(uint8_t, 0x2000100e, 0x47, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x2000100e, 4, 4, 4);
    STORE_BY_BITMASK(uint8_t, 0x2000100f, 0, 0, 2);
    STORE_BY_BITMASK(uint8_t, 0x2000100f, 0, 2, 6);
    *(uint16_t*)0x20001010 = htobe16(0x21);
    *(uint16_t*)0x20001012 = 0;
    *(uint16_t*)0x20001014 = htobe16(0);
    *(uint8_t*)0x20001016 = 0;
    *(uint8_t*)0x20001017 = 0;
    *(uint16_t*)0x20001018 = 0;
    *(uint8_t*)0x2000101a = 0xac;
    *(uint8_t*)0x2000101b = 0x14;
    *(uint8_t*)0x2000101c = 0;
    *(uint8_t*)0x2000101d = 0xaa;
    *(uint32_t*)0x2000101e = htobe32(0);
    *(uint16_t*)0x20001022 = 0;
    *(uint16_t*)0x20001024 = 0;
    *(uint32_t*)0x20001026 = 0x42424242;
    *(uint32_t*)0x2000102a = 0x42424242;
    STORE_BY_BITMASK(uint8_t, 0x2000102e, 0, 0, 1);
    STORE_BY_BITMASK(uint8_t, 0x2000102e, 0, 1, 3);
    STORE_BY_BITMASK(uint8_t, 0x2000102e, 5, 4, 4);
    *(uint8_t*)0x2000102f = 0;
    *(uint16_t*)0x20001030 = htobe16(0);
    *(uint16_t*)0x20001032 = 0;
    *(uint16_t*)0x20001034 = htobe16(0);
    struct csum_inet csum_1;
    csum_inet_init(&csum_1);
    csum_inet_update(&csum_1, (const uint8_t*)0x2000101a, 4);
    csum_inet_update(&csum_1, (const uint8_t*)0x2000101e, 4);
    uint16_t csum_1_chunk_2 = 0x600;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 2);
    uint16_t csum_1_chunk_3 = 0x1400;
    csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 2);
    csum_inet_update(&csum_1, (const uint8_t*)0x20001022, 20);
    *(uint16_t*)0x20001032 = csum_inet_digest(&csum_1);
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    csum_inet_update(&csum_2, (const uint8_t*)0x2000100e, 20);
    *(uint16_t*)0x20001018 = csum_inet_digest(&csum_2);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(8);
  collide = 1;
  execute(8);
}

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