// https://syzkaller.appspot.com/bug?id=ec69610f74e78616269c2ec8f697d8efc701a31c
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <sys/syscall.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/stat.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

#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 __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  struct sigaction sa;

  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

static void use_temporary_dir()
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    fail("failed to mkdtemp");
  if (chmod(tmpdir, 0777))
    fail("failed to chmod");
  if (chdir(tmpdir))
    fail("failed to chdir");
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void loop()
{
  long res;
  res = syscall(__NR_socket, 0xa, 2, 0);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_socket, 0x18, 1, 1);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint16_t*)0x205fafd2 = 0x18);
  NONFAILING(*(uint32_t*)0x205fafd4 = 1);
  NONFAILING(*(uint32_t*)0x205fafd8 = 0);
  NONFAILING(*(uint32_t*)0x205fafdc = r[0]);
  NONFAILING(*(uint16_t*)0x205fafe0 = 2);
  NONFAILING(*(uint16_t*)0x205fafe2 = htobe16(0x4e21));
  NONFAILING(*(uint8_t*)0x205fafe4 = 0xac);
  NONFAILING(*(uint8_t*)0x205fafe5 = 0x14);
  NONFAILING(*(uint8_t*)0x205fafe6 = 0);
  NONFAILING(*(uint8_t*)0x205fafe7 = 0xbb);
  NONFAILING(*(uint8_t*)0x205fafe8 = 0);
  NONFAILING(*(uint8_t*)0x205fafe9 = 0);
  NONFAILING(*(uint8_t*)0x205fafea = 0);
  NONFAILING(*(uint8_t*)0x205fafeb = 0);
  NONFAILING(*(uint8_t*)0x205fafec = 0);
  NONFAILING(*(uint8_t*)0x205fafed = 0);
  NONFAILING(*(uint8_t*)0x205fafee = 0);
  NONFAILING(*(uint8_t*)0x205fafef = 0);
  NONFAILING(*(uint32_t*)0x205faff0 = 4);
  NONFAILING(*(uint32_t*)0x205faff4 = 0);
  NONFAILING(*(uint32_t*)0x205faff8 = 2);
  NONFAILING(*(uint32_t*)0x205faffc = 0);
  syscall(__NR_connect, r[1], 0x205fafd2, 0x2e);
  NONFAILING(*(uint16_t*)0x200002c0 = 0xa);
  NONFAILING(*(uint16_t*)0x200002c2 = htobe16(0x4e21));
  NONFAILING(*(uint32_t*)0x200002c4 = 0x7fff);
  NONFAILING(*(uint8_t*)0x200002c8 = 0);
  NONFAILING(*(uint8_t*)0x200002c9 = 0);
  NONFAILING(*(uint8_t*)0x200002ca = 0);
  NONFAILING(*(uint8_t*)0x200002cb = 0);
  NONFAILING(*(uint8_t*)0x200002cc = 0);
  NONFAILING(*(uint8_t*)0x200002cd = 0);
  NONFAILING(*(uint8_t*)0x200002ce = 0);
  NONFAILING(*(uint8_t*)0x200002cf = 0);
  NONFAILING(*(uint8_t*)0x200002d0 = 0);
  NONFAILING(*(uint8_t*)0x200002d1 = 0);
  NONFAILING(*(uint8_t*)0x200002d2 = -1);
  NONFAILING(*(uint8_t*)0x200002d3 = -1);
  NONFAILING(*(uint8_t*)0x200002d4 = 0xac);
  NONFAILING(*(uint8_t*)0x200002d5 = 0x14);
  NONFAILING(*(uint8_t*)0x200002d6 = 0x14);
  NONFAILING(*(uint8_t*)0x200002d7 = 0xaa);
  NONFAILING(*(uint32_t*)0x200002d8 = 3);
  syscall(__NR_connect, r[0], 0x200002c0, 0x1c);
  NONFAILING(*(uint16_t*)0x200021c0 = 0x18);
  NONFAILING(*(uint32_t*)0x200021c2 = 0);
  NONFAILING(*(uint16_t*)0x200021c6 = 0);
  NONFAILING(*(uint8_t*)0x200021c8 = 0);
  NONFAILING(*(uint8_t*)0x200021c9 = 0);
  NONFAILING(*(uint8_t*)0x200021ca = 0);
  NONFAILING(*(uint8_t*)0x200021cb = 0);
  NONFAILING(*(uint8_t*)0x200021cc = 0);
  NONFAILING(*(uint8_t*)0x200021cd = 0);
  NONFAILING(memcpy(
      (void*)0x200021ce,
      "\x69\x66\x62\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16));
  syscall(__NR_sendto, r[1], 0x20001180, 0, 0x40001, 0x200021c0, 0x80);
  NONFAILING(memcpy((void*)0x20101000, "\xcd\x39\x0b\x08\x1b\xf2", 6));
  NONFAILING(*(uint8_t*)0x20101006 = 1);
  NONFAILING(*(uint8_t*)0x20101007 = 0x80);
  NONFAILING(*(uint8_t*)0x20101008 = 0xc2);
  NONFAILING(*(uint8_t*)0x20101009 = 0);
  NONFAILING(*(uint8_t*)0x2010100a = 0);
  NONFAILING(*(uint8_t*)0x2010100b = 3);
  NONFAILING(*(uint16_t*)0x2010100c = htobe16(0x86dd));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2010100e, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2010100e, 6, 4, 4));
  NONFAILING(memcpy((void*)0x2010100f, "\x02\x29\x0f", 3));
  NONFAILING(*(uint16_t*)0x20101012 = htobe16(0x30));
  NONFAILING(*(uint8_t*)0x20101014 = 0x3a);
  NONFAILING(*(uint8_t*)0x20101015 = 0);
  NONFAILING(*(uint8_t*)0x20101016 = 0);
  NONFAILING(*(uint8_t*)0x20101017 = 0);
  NONFAILING(*(uint8_t*)0x20101018 = 0);
  NONFAILING(*(uint8_t*)0x20101019 = 0);
  NONFAILING(*(uint8_t*)0x2010101a = 0);
  NONFAILING(*(uint8_t*)0x2010101b = 0);
  NONFAILING(*(uint8_t*)0x2010101c = 0);
  NONFAILING(*(uint8_t*)0x2010101d = 0);
  NONFAILING(*(uint8_t*)0x2010101e = 0);
  NONFAILING(*(uint8_t*)0x2010101f = 0);
  NONFAILING(*(uint8_t*)0x20101020 = -1);
  NONFAILING(*(uint8_t*)0x20101021 = -1);
  NONFAILING(*(uint32_t*)0x20101022 = htobe32(0));
  NONFAILING(*(uint8_t*)0x20101026 = -1);
  NONFAILING(*(uint8_t*)0x20101027 = 2);
  NONFAILING(*(uint8_t*)0x20101028 = 0);
  NONFAILING(*(uint8_t*)0x20101029 = 0);
  NONFAILING(*(uint8_t*)0x2010102a = 0);
  NONFAILING(*(uint8_t*)0x2010102b = 0);
  NONFAILING(*(uint8_t*)0x2010102c = 0);
  NONFAILING(*(uint8_t*)0x2010102d = 0);
  NONFAILING(*(uint8_t*)0x2010102e = 0);
  NONFAILING(*(uint8_t*)0x2010102f = 0);
  NONFAILING(*(uint8_t*)0x20101030 = 0);
  NONFAILING(*(uint8_t*)0x20101031 = 0);
  NONFAILING(*(uint8_t*)0x20101032 = 0);
  NONFAILING(*(uint8_t*)0x20101033 = 0);
  NONFAILING(*(uint8_t*)0x20101034 = 0);
  NONFAILING(*(uint8_t*)0x20101035 = 1);
  NONFAILING(*(uint8_t*)0x20101036 = 2);
  NONFAILING(*(uint8_t*)0x20101037 = 0);
  NONFAILING(*(uint16_t*)0x20101038 = 0);
  NONFAILING(*(uint32_t*)0x2010103a = htobe32(0));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2010103e, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, 0x2010103e, 6, 4, 4));
  NONFAILING(memcpy((void*)0x2010103f, "\x94\x33\xdf", 3));
  NONFAILING(*(uint16_t*)0x20101042 = htobe16(0));
  NONFAILING(*(uint8_t*)0x20101044 = 0x3a);
  NONFAILING(*(uint8_t*)0x20101045 = 0);
  NONFAILING(*(uint64_t*)0x20101046 = htobe64(0));
  NONFAILING(*(uint64_t*)0x2010104e = htobe64(1));
  NONFAILING(*(uint8_t*)0x20101056 = 0xfe);
  NONFAILING(*(uint8_t*)0x20101057 = 0x80);
  NONFAILING(*(uint8_t*)0x20101058 = 0);
  NONFAILING(*(uint8_t*)0x20101059 = 0);
  NONFAILING(*(uint8_t*)0x2010105a = 0);
  NONFAILING(*(uint8_t*)0x2010105b = 0);
  NONFAILING(*(uint8_t*)0x2010105c = 0);
  NONFAILING(*(uint8_t*)0x2010105d = 0);
  NONFAILING(*(uint8_t*)0x2010105e = 0);
  NONFAILING(*(uint8_t*)0x2010105f = 0);
  NONFAILING(*(uint8_t*)0x20101060 = 0);
  NONFAILING(*(uint8_t*)0x20101061 = 0);
  NONFAILING(*(uint8_t*)0x20101062 = 0);
  NONFAILING(*(uint8_t*)0x20101063 = 0);
  NONFAILING(*(uint8_t*)0x20101064 = 0);
  NONFAILING(*(uint8_t*)0x20101065 = 0);
  struct csum_inet csum_1;
  csum_inet_init(&csum_1);
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20101016, 16));
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20101026, 16));
  uint32_t csum_1_chunk_2 = 0x30000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_2, 4);
  uint32_t csum_1_chunk_3 = 0x3a000000;
  csum_inet_update(&csum_1, (const uint8_t*)&csum_1_chunk_3, 4);
  NONFAILING(csum_inet_update(&csum_1, (const uint8_t*)0x20101036, 48));
  NONFAILING(*(uint16_t*)0x20101038 = csum_inet_digest(&csum_1));
}

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