// https://syzkaller.appspot.com/bug?id=9f27e880d757d8e1b7bebd36a4c391fccb92f134
// 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;
}

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;
      }
    }
  }
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    res = syscall(__NR_socket, 0xa, 6, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    *(uint16_t*)0x20000340 = 0xa;
    *(uint16_t*)0x20000342 = htobe16(0x4e20);
    *(uint32_t*)0x20000344 = 6;
    *(uint8_t*)0x20000348 = 0;
    *(uint8_t*)0x20000349 = 0;
    *(uint8_t*)0x2000034a = 0;
    *(uint8_t*)0x2000034b = 0;
    *(uint8_t*)0x2000034c = 0;
    *(uint8_t*)0x2000034d = 0;
    *(uint8_t*)0x2000034e = 0;
    *(uint8_t*)0x2000034f = 0;
    *(uint8_t*)0x20000350 = 0;
    *(uint8_t*)0x20000351 = 0;
    *(uint8_t*)0x20000352 = 0;
    *(uint8_t*)0x20000353 = 0;
    *(uint8_t*)0x20000354 = 0;
    *(uint8_t*)0x20000355 = 0;
    *(uint8_t*)0x20000356 = 0;
    *(uint8_t*)0x20000357 = 0;
    *(uint32_t*)0x20000358 = 0xfffffffc;
    syscall(__NR_bind, r[0], 0x20000340, 0x1c);
    break;
  case 2:
    res = syscall(__NR_socket, 2, 6, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    syscall(__NR_listen, r[0], 6);
    break;
  case 4:
    memcpy((void*)0x20000080, "\x03", 1);
    syscall(__NR_setsockopt, r[1], 0x10d, 0xd, 0x20000080, 1);
    break;
  case 5:
    *(uint16_t*)0x20e5c000 = 2;
    *(uint16_t*)0x20e5c002 = htobe16(0x4e20);
    *(uint32_t*)0x20e5c004 = htobe32(0x7f000001);
    *(uint8_t*)0x20e5c008 = 0;
    *(uint8_t*)0x20e5c009 = 0;
    *(uint8_t*)0x20e5c00a = 0;
    *(uint8_t*)0x20e5c00b = 0;
    *(uint8_t*)0x20e5c00c = 0;
    *(uint8_t*)0x20e5c00d = 0;
    *(uint8_t*)0x20e5c00e = 0;
    *(uint8_t*)0x20e5c00f = 0;
    syscall(__NR_connect, r[1], 0x20e5c000, 0x10);
    break;
  case 6:
    *(uint32_t*)0x20000040 = 0x80;
    res = syscall(__NR_accept, r[0], 0x20000240, 0x20000040);
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    *(uint64_t*)0x20000800 = 0x20000380;
    *(uint16_t*)0x20000380 = 1;
    *(uint8_t*)0x20000382 = 0;
    *(uint32_t*)0x20000384 = 0x4e21;
    *(uint32_t*)0x20000808 = 0x6e;
    *(uint64_t*)0x20000810 = 0x20000740;
    *(uint64_t*)0x20000740 = 0x20000400;
    *(uint64_t*)0x20000748 = 0;
    *(uint64_t*)0x20000750 = 0x20000500;
    *(uint64_t*)0x20000758 = 0;
    *(uint64_t*)0x20000760 = 0x200006c0;
    memcpy((void*)0x200006c0,
           "\x70\x7c\x28\x7f\x30\xba\x64\x2d\x38\xf7\xa6\x7c\x0d\xb8\x0c\x5f"
           "\xd1\x4b\x3a\x11\x7d\xbf\xc1\x45\xe1\xa0\xd0\x1f\xa6\xb2\x18\x56"
           "\xfb\x64\x70\x57\xe1\x8b\xda\xa6\x43\x75\xa4\xb5\x71\x1c\x00\x43"
           "\x05\xb0\x82\x29\x38\x59\xec\xe3\x6b\x0d\x8b\x5b\x79\xdc\xf9\x60"
           "\xfb\xfe\xa5\x14\x72\x7a\x06\xf1\x61\x0c\x85\xf3\x42\xda\x61",
           79);
    *(uint64_t*)0x20000768 = 0x4f;
    *(uint64_t*)0x20000818 = 3;
    *(uint64_t*)0x20000820 = 0x200007c0;
    *(uint64_t*)0x20000828 = 0;
    *(uint32_t*)0x20000830 = 0x8000;
    syscall(__NR_sendmmsg, r[2], 0x20000800, 1, 0x8000);
    break;
  case 8:
    *(uint64_t*)0x20000200 = 0x200000c0;
    *(uint16_t*)0x200000c0 = 0x10;
    *(uint16_t*)0x200000c2 = 0;
    *(uint32_t*)0x200000c4 = 0;
    *(uint32_t*)0x200000c8 = 0;
    *(uint32_t*)0x20000208 = 0xc;
    *(uint64_t*)0x20000210 = 0x200001c0;
    *(uint64_t*)0x200001c0 = 0x20001840;
    *(uint64_t*)0x200001c8 = 1;
    *(uint64_t*)0x20000218 = 1;
    *(uint64_t*)0x20000220 = 0;
    *(uint64_t*)0x20000228 = 0;
    *(uint32_t*)0x20000230 = 0;
    syscall(__NR_sendmsg, r[2], 0x20000200, 0);
    break;
  case 9:
    *(uint64_t*)0x20000600 = 0x20000300;
    *(uint16_t*)0x20000300 = 0x10;
    *(uint16_t*)0x20000302 = 0;
    *(uint32_t*)0x20000304 = 0;
    *(uint32_t*)0x20000308 = 0x40000002;
    *(uint32_t*)0x20000608 = 0xc;
    *(uint64_t*)0x20000610 = 0x200005c0;
    *(uint64_t*)0x200005c0 = 0x200004c0;
    *(uint32_t*)0x200004c0 = 0x14;
    *(uint16_t*)0x200004c4 = 0;
    *(uint16_t*)0x200004c6 = 0x908;
    *(uint32_t*)0x200004c8 = 0x70bd2c;
    *(uint32_t*)0x200004cc = 0x25dfdbfb;
    *(uint8_t*)0x200004d0 = 3;
    *(uint8_t*)0x200004d1 = 0;
    *(uint16_t*)0x200004d2 = 0;
    *(uint64_t*)0x200005c8 = 0x14;
    *(uint64_t*)0x20000618 = 1;
    *(uint64_t*)0x20000620 = 0;
    *(uint64_t*)0x20000628 = 0;
    *(uint32_t*)0x20000630 = 0xb167f2fa;
    syscall(__NR_sendmsg, r[1], 0x20000600, 0x4000);
    break;
  case 10:
    *(uint8_t*)0x20000040 = 0xaa;
    *(uint8_t*)0x20000041 = 0xaa;
    *(uint8_t*)0x20000042 = 0xaa;
    *(uint8_t*)0x20000043 = 0xaa;
    *(uint8_t*)0x20000044 = 0xaa;
    *(uint8_t*)0x20000045 = 0xaa;
    *(uint8_t*)0x20000046 = -1;
    *(uint8_t*)0x20000047 = -1;
    *(uint8_t*)0x20000048 = -1;
    *(uint8_t*)0x20000049 = -1;
    *(uint8_t*)0x2000004a = -1;
    *(uint8_t*)0x2000004b = -1;
    *(uint16_t*)0x2000004c = htobe16(0x800);
    STORE_BY_BITMASK(uint8_t, 0x2000004e, 7, 0, 4);
    STORE_BY_BITMASK(uint8_t, 0x2000004e, 4, 4, 4);
    STORE_BY_BITMASK(uint8_t, 0x2000004f, 0, 0, 2);
    STORE_BY_BITMASK(uint8_t, 0x2000004f, 0, 2, 6);
    *(uint16_t*)0x20000050 = htobe16(0x30);
    *(uint16_t*)0x20000052 = htobe16(0);
    *(uint16_t*)0x20000054 = htobe16(0);
    *(uint8_t*)0x20000056 = 0;
    *(uint8_t*)0x20000057 = 0;
    *(uint16_t*)0x20000058 = 0;
    *(uint8_t*)0x2000005a = 0xac;
    *(uint8_t*)0x2000005b = 0x14;
    *(uint8_t*)0x2000005c = 0x14;
    *(uint8_t*)0x2000005d = 0xbb;
    *(uint8_t*)0x2000005e = 0xac;
    *(uint8_t*)0x2000005f = 0x23;
    *(uint8_t*)0x20000060 = 0x14;
    *(uint8_t*)0x20000061 = 0xaa;
    *(uint8_t*)0x20000062 = 7;
    *(uint8_t*)0x20000063 = 7;
    *(uint8_t*)0x20000064 = 4;
    *(uint32_t*)0x20000065 = htobe32(0);
    *(uint16_t*)0x2000006a = htobe16(0);
    *(uint16_t*)0x2000006c = htobe16(0);
    *(uint32_t*)0x2000006e = 0x41424344;
    *(uint32_t*)0x20000072 = 0x41424344;
    STORE_BY_BITMASK(uint8_t, 0x20000076, 0, 0, 1);
    STORE_BY_BITMASK(uint8_t, 0x20000076, 0, 1, 3);
    STORE_BY_BITMASK(uint8_t, 0x20000076, 5, 4, 4);
    *(uint8_t*)0x20000077 = 0;
    *(uint16_t*)0x20000078 = htobe16(0);
    *(uint16_t*)0x2000007a = 0;
    *(uint16_t*)0x2000007c = htobe16(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*)0x2000005a, 4);
    csum_inet_update(&csum_1, (const uint8_t*)0x2000005e, 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*)0x2000006a, 20);
    *(uint16_t*)0x2000007a = csum_inet_digest(&csum_1);
    struct csum_inet csum_2;
    csum_inet_init(&csum_2);
    csum_inet_update(&csum_2, (const uint8_t*)0x2000004e, 28);
    *(uint16_t*)0x20000058 = csum_inet_digest(&csum_2);
    break;
  }
}

void loop()
{
  execute(11);
  collide = 1;
  execute(11);
}

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