// https://syzkaller.appspot.com/bug?id=303cb30b3905467ed3dd21c6fd1383c327e9a194
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  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);                       \
  }

#define __syscall syscall

uint64_t r[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0xffffffffffffffff};

int main(void)
{
  syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul, 0ul);
  install_segv_handler();
  intptr_t res = 0;
  res = syscall(SYS_kqueue);
  if (res != -1)
    r[0] = res;
  res = syscall(SYS_fcntl, r[0], 2ul, -1);
  if (res != -1)
    r[1] = res;
  syscall(SYS_close, r[1]);
  NONFAILING(memcpy((void*)0x20000000, "\xa1\x02\x81\x00\xff\xff\xff\xff", 8));
  syscall(SYS_connect, -1, 0x20000000ul, 1ul);
  syscall(SYS_mprotect, 0x20000000ul, 0x800000ul, 5ul);
  res = syscall(SYS_socket, 2ul, 2ul, 0);
  if (res != -1)
    r[2] = res;
  NONFAILING(*(uint16_t*)0x20000000 = 0);
  NONFAILING(*(uint8_t*)0x20000002 = 0xd);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  syscall(SYS_bind, r[2], 0x20000000ul, 0x10ul);
  res = syscall(SYS_socket, 2ul, 2ul, 0);
  if (res != -1)
    r[3] = res;
  res = syscall(SYS_dup2, r[2], r[3]);
  if (res != -1)
    r[4] = res;
  syscall(SYS_connect, r[3], 0x20000000ul, 0x10ul);
  NONFAILING(memcpy((void*)0x20000040,
                    "\x07\x14\x1a\x72\xc9\x97\x00\x25\xff\x14\x9b\x33\xff\x0f"
                    "\x00\x00\x00\x00\x00\x00",
                    20));
  syscall(SYS_setsockopt, r[4], 0, 1, 0x20000040ul, 0x14ul);
  syscall(SYS_write, r[3], 0ul, 0ul);
  NONFAILING(*(uint32_t*)0x20000080 = 0);
  syscall(SYS_setsockopt, r[1], 0xffff, 0x1023, 0x20000080ul, 4ul);
  res = syscall(SYS_kqueue);
  if (res != -1)
    r[5] = res;
  res = syscall(SYS_fcntl, r[5], 2ul, -1);
  if (res != -1)
    r[6] = res;
  syscall(SYS_shutdown, r[6], 2ul);
  return 0;
}