// https://syzkaller.appspot.com/bug?id=bff61d87129afb198021fa0a2d4d09706a14ada8
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/kvm.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <signal.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  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);
}

__attribute__((noreturn)) static void exitf(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

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);
  for (;;) {
  }
}

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");
}

static void vsnprintf_check(char* str, size_t size, const char* format,
                            va_list args)
{
  int rv;

  rv = vsnprintf(str, size, format, args);
  if (rv < 0)
    fail("tun: snprintf failed");
  if ((size_t)rv >= size)
    fail("tun: string '%s...' doesn't fit into buffer", str);
}

static void snprintf_check(char* str, size_t size, const char* format,
                           ...)
{
  va_list args;

  va_start(args, format);
  vsnprintf_check(str, size, format, args);
  va_end(args);
}

#define COMMAND_MAX_LEN 128

static void execute_command(const char* format, ...)
{
  va_list args;
  char command[COMMAND_MAX_LEN];
  int rv;

  va_start(args, format);

  vsnprintf_check(command, sizeof(command), format, args);
  rv = system(command);
  if (rv != 0)
    fail("tun: command \"%s\" failed with code %d", &command[0], rv);

  va_end(args);
}

static int tunfd = -1;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define MAX_PIDS 32
#define ADDR_MAX_LEN 32

#define LOCAL_MAC "aa:aa:aa:aa:aa:%02hx"
#define REMOTE_MAC "bb:bb:bb:bb:bb:%02hx"

#define LOCAL_IPV4 "172.20.%d.170"
#define REMOTE_IPV4 "172.20.%d.187"

#define LOCAL_IPV6 "fe80::%02hxaa"
#define REMOTE_IPV6 "fe80::%02hxbb"

static void initialize_tun(uint64_t pid)
{
  if (pid >= MAX_PIDS)
    fail("tun: no more than %d executors", MAX_PIDS);
  int id = pid;

  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1)
    fail("tun: can't open /dev/net/tun");

  char iface[IFNAMSIZ];
  snprintf_check(iface, sizeof(iface), "syz%d", id);

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, iface, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNSETIFF) failed");

  char local_mac[ADDR_MAX_LEN];
  snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id);
  char remote_mac[ADDR_MAX_LEN];
  snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id);

  char local_ipv4[ADDR_MAX_LEN];
  snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id);
  char remote_ipv4[ADDR_MAX_LEN];
  snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id);

  char local_ipv6[ADDR_MAX_LEN];
  snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id);
  char remote_ipv6[ADDR_MAX_LEN];
  snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id);

  execute_command("sysctl -w net.ipv6.conf.%s.accept_dad=0", iface);

  execute_command("sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  iface);

  execute_command("ip link set dev %s address %s", iface, local_mac);
  execute_command("ip addr add %s/24 dev %s", local_ipv4, iface);
  execute_command("ip -6 addr add %s/120 dev %s", local_ipv6, iface);
  execute_command("ip neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv4, remote_mac, iface);
  execute_command("ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  remote_ipv6, remote_mac, iface);
  execute_command("ip link set dev %s up", iface);
}

static void setup_tun(uint64_t pid, bool enable_tun)
{
  if (enable_tun)
    initialize_tun(pid);
}

static int read_tun(char* data, int size)
{
  int rv = read(tunfd, data, size);
  if (rv < 0) {
    if (errno == EAGAIN)
      return -1;
    fail("tun: read failed with %d, errno: %d", rv, errno);
  }
  return rv;
}

static void flush_tun()
{
  char data[SYZ_TUN_MAX_PACKET_SIZE];
  while (read_tun(&data[0], sizeof(data)) != -1)
    ;
}

const char kvm_asm16_cpl3[] =
    "\x0f\x20\xc0\x66\x83\xc8\x01\x0f\x22\xc0\xb8\xa0\x00\x0f\x00\xd8"
    "\xb8\x2b\x00\x8e\xd8\x8e\xc0\x8e\xe0\x8e\xe8\xbc\x00\x01\xc7\x06"
    "\x00\x01\x1d\xba\xc7\x06\x02\x01\x23\x00\xc7\x06\x04\x01\x00\x01"
    "\xc7\x06\x06\x01\x2b\x00\xcb";
const char kvm_asm32_paged[] =
    "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0";
const char kvm_asm32_vm86[] =
    "\x66\xb8\xb8\x00\x0f\x00\xd8\xea\x00\x00\x00\x00\xd0\x00";
const char kvm_asm32_paged_vm86[] =
    "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\x66\xb8\xb8\x00\x0f"
    "\x00\xd8\xea\x00\x00\x00\x00\xd0\x00";
const char kvm_asm64_vm86[] = "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22"
                              "\xc0\x66\xb8\xb8\x00\x0f\x00\xd8\xea\x00"
                              "\x00\x00\x00\xd0\x00";
const char kvm_asm64_enable_long[] =
    "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\xea\xde\xc0\xad\x0b"
    "\x50\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f\x00\xd8";
const char kvm_asm64_init_vm[] =
    "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\xea\xde\xc0\xad\x0b"
    "\x50\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f\x00\xd8\x48\xc7\xc1\x3a"
    "\x00\x00\x00\x0f\x32\x48\x83\xc8\x05\x0f\x30\x0f\x20\xe0\x48\x0d"
    "\x00\x20\x00\x00\x0f\x22\xe0\x48\xc7\xc1\x80\x04\x00\x00\x0f\x32"
    "\x48\xc7\xc2\x00\x60\x00\x00\x89\x02\x48\xc7\xc2\x00\x70\x00\x00"
    "\x89\x02\x48\xc7\xc0\x00\x5f\x00\x00\xf3\x0f\xc7\x30\x48\xc7\xc0"
    "\x08\x5f\x00\x00\x66\x0f\xc7\x30\x0f\xc7\x30\x48\xc7\xc1\x81\x04"
    "\x00\x00\x0f\x32\x48\x83\xc8\x3f\x48\x21\xd0\x48\xc7\xc2\x00\x40"
    "\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x02\x40\x00\x00\x48\xb8\x84\x9e"
    "\x99\xf3\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x1e\x40\x00\x00"
    "\x48\xc7\xc0\x81\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc1\x83\x04\x00"
    "\x00\x0f\x32\x48\x0d\xff\x6f\x03\x00\x48\x21\xd0\x48\xc7\xc2\x0c"
    "\x40\x00\x00\x0f\x79\xd0\x48\xc7\xc1\x84\x04\x00\x00\x0f\x32\x48"
    "\x0d\xff\x17\x00\x00\x48\x21\xd0\x48\xc7\xc2\x12\x40\x00\x00\x0f"
    "\x79\xd0\x48\xc7\xc2\x04\x2c\x00\x00\x48\xc7\xc0\x00\x00\x00\x00"
    "\x0f\x79\xd0\x48\xc7\xc2\x00\x28\x00\x00\x48\xc7\xc0\xff\xff\xff"
    "\xff\x0f\x79\xd0\x48\xc7\xc2\x02\x0c\x00\x00\x48\xc7\xc0\x50\x00"
    "\x00\x00\x0f\x79\xd0\x48\xc7\xc0\x58\x00\x00\x00\x48\xc7\xc2\x00"
    "\x0c\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x04\x0c\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x06\x0c\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x08\x0c\x00"
    "\x00\x0f\x79\xd0\x48\xc7\xc2\x0a\x0c\x00\x00\x0f\x79\xd0\x48\xc7"
    "\xc0\xd8\x00\x00\x00\x48\xc7\xc2\x0c\x0c\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x02\x2c\x00\x00\x48\xc7\xc0\x00\x05\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x00\x4c\x00\x00\x48\xc7\xc0\x50\x00\x00\x00\x0f\x79"
    "\xd0\x48\xc7\xc2\x10\x6c\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f"
    "\x79\xd0\x48\xc7\xc2\x12\x6c\x00\x00\x48\xc7\xc0\x00\x00\x00\x00"
    "\x0f\x79\xd0\x0f\x20\xc0\x48\xc7\xc2\x00\x6c\x00\x00\x48\x89\xc0"
    "\x0f\x79\xd0\x0f\x20\xd8\x48\xc7\xc2\x02\x6c\x00\x00\x48\x89\xc0"
    "\x0f\x79\xd0\x0f\x20\xe0\x48\xc7\xc2\x04\x6c\x00\x00\x48\x89\xc0"
    "\x0f\x79\xd0\x48\xc7\xc2\x06\x6c\x00\x00\x48\xc7\xc0\x00\x00\x00"
    "\x00\x0f\x79\xd0\x48\xc7\xc2\x08\x6c\x00\x00\x48\xc7\xc0\x00\x00"
    "\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x0a\x6c\x00\x00\x48\xc7\xc0\x00"
    "\x3a\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x0c\x6c\x00\x00\x48\xc7\xc0"
    "\x00\x10\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x0e\x6c\x00\x00\x48\xc7"
    "\xc0\x00\x38\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x14\x6c\x00\x00\x48"
    "\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x16\x6c\x00\x00"
    "\x48\x8b\x04\x25\x10\x5f\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x00\x00"
    "\x00\x00\x48\xc7\xc0\x01\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x02"
    "\x00\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2"
    "\x00\x20\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7"
    "\xc2\x02\x20\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x04\x20\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x06\x20\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79"
    "\xd0\x48\xc7\xc1\x77\x02\x00\x00\x0f\x32\x48\xc1\xe2\x20\x48\x09"
    "\xd0\x48\xc7\xc2\x00\x2c\x00\x00\x48\x89\xc0\x0f\x79\xd0\x48\xc7"
    "\xc2\x04\x40\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x0a\x40\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x0e\x40\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79"
    "\xd0\x48\xc7\xc2\x10\x40\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f"
    "\x79\xd0\x48\xc7\xc2\x16\x40\x00\x00\x48\xc7\xc0\x00\x00\x00\x00"
    "\x0f\x79\xd0\x48\xc7\xc2\x14\x40\x00\x00\x48\xc7\xc0\x00\x00\x00"
    "\x00\x0f\x79\xd0\x48\xc7\xc2\x00\x60\x00\x00\x48\xc7\xc0\xff\xff"
    "\xff\xff\x0f\x79\xd0\x48\xc7\xc2\x02\x60\x00\x00\x48\xc7\xc0\xff"
    "\xff\xff\xff\x0f\x79\xd0\x48\xc7\xc2\x1c\x20\x00\x00\x48\xc7\xc0"
    "\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x1e\x20\x00\x00\x48\xc7"
    "\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x20\x20\x00\x00\x48"
    "\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x22\x20\x00\x00"
    "\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x00\x08\x00"
    "\x00\x48\xc7\xc0\x58\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x02\x08"
    "\x00\x00\x48\xc7\xc0\x50\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x04"
    "\x08\x00\x00\x48\xc7\xc0\x58\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2"
    "\x06\x08\x00\x00\x48\xc7\xc0\x58\x00\x00\x00\x0f\x79\xd0\x48\xc7"
    "\xc2\x08\x08\x00\x00\x48\xc7\xc0\x58\x00\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x0a\x08\x00\x00\x48\xc7\xc0\x58\x00\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x0c\x08\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79"
    "\xd0\x48\xc7\xc2\x0e\x08\x00\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f"
    "\x79\xd0\x48\xc7\xc2\x12\x68\x00\x00\x48\xc7\xc0\x00\x00\x00\x00"
    "\x0f\x79\xd0\x48\xc7\xc2\x14\x68\x00\x00\x48\xc7\xc0\x00\x3a\x00"
    "\x00\x0f\x79\xd0\x48\xc7\xc2\x16\x68\x00\x00\x48\xc7\xc0\x00\x10"
    "\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x18\x68\x00\x00\x48\xc7\xc0\x00"
    "\x38\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x00\x48\x00\x00\x48\xc7\xc0"
    "\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x02\x48\x00\x00\x48\xc7"
    "\xc0\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x04\x48\x00\x00\x48"
    "\xc7\xc0\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x06\x48\x00\x00"
    "\x48\xc7\xc0\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x08\x48\x00"
    "\x00\x48\xc7\xc0\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x0a\x48"
    "\x00\x00\x48\xc7\xc0\xff\xff\x0f\x00\x0f\x79\xd0\x48\xc7\xc2\x0c"
    "\x48\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2"
    "\x0e\x48\x00\x00\x48\xc7\xc0\xff\x1f\x00\x00\x0f\x79\xd0\x48\xc7"
    "\xc2\x10\x48\x00\x00\x48\xc7\xc0\xff\x1f\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x12\x48\x00\x00\x48\xc7\xc0\xff\x1f\x00\x00\x0f\x79\xd0"
    "\x48\xc7\xc2\x14\x48\x00\x00\x48\xc7\xc0\x93\x40\x00\x00\x0f\x79"
    "\xd0\x48\xc7\xc2\x16\x48\x00\x00\x48\xc7\xc0\x9b\x20\x00\x00\x0f"
    "\x79\xd0\x48\xc7\xc2\x18\x48\x00\x00\x48\xc7\xc0\x93\x40\x00\x00"
    "\x0f\x79\xd0\x48\xc7\xc2\x1a\x48\x00\x00\x48\xc7\xc0\x93\x40\x00"
    "\x00\x0f\x79\xd0\x48\xc7\xc2\x1c\x48\x00\x00\x48\xc7\xc0\x93\x40"
    "\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x1e\x48\x00\x00\x48\xc7\xc0\x93"
    "\x40\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x20\x48\x00\x00\x48\xc7\xc0"
    "\x82\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x22\x48\x00\x00\x48\xc7"
    "\xc0\x8b\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x1c\x68\x00\x00\x48"
    "\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x1e\x68\x00\x00"
    "\x48\xc7\xc0\x00\x91\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x20\x68\x00"
    "\x00\x48\xc7\xc0\x02\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x06\x28"
    "\x00\x00\x48\xc7\xc0\x00\x05\x00\x00\x0f\x79\xd0\x48\xc7\xc2\x0a"
    "\x28\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7\xc2"
    "\x0c\x28\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48\xc7"
    "\xc2\x0e\x28\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0\x48"
    "\xc7\xc2\x10\x28\x00\x00\x48\xc7\xc0\x00\x00\x00\x00\x0f\x79\xd0"
    "\x0f\x20\xc0\x48\xc7\xc2\x00\x68\x00\x00\x48\x89\xc0\x0f\x79\xd0"
    "\x0f\x20\xd8\x48\xc7\xc2\x02\x68\x00\x00\x48\x89\xc0\x0f\x79\xd0"
    "\x0f\x20\xe0\x48\xc7\xc2\x04\x68\x00\x00\x48\x89\xc0\x0f\x79\xd0"
    "\x48\xc7\xc0\x18\x5f\x00\x00\x48\x8b\x10\x48\xc7\xc0\x20\x5f\x00"
    "\x00\x48\x8b\x08\x48\x31\xc0\x0f\x78\xd0\x48\x31\xc8\x0f\x79\xd0"
    "\x0f\x01\xc2\x48\xc7\xc2\x00\x44\x00\x00\x0f\x78\xd0\xf4";
const char kvm_asm64_vm_exit[] =
    "\x48\xc7\xc3\x00\x44\x00\x00\x0f\x78\xda\x48\xc7\xc3\x02\x44\x00"
    "\x00\x0f\x78\xd9\x48\xc7\xc0\x00\x64\x00\x00\x0f\x78\xc0\x48\xc7"
    "\xc3\x1e\x68\x00\x00\x0f\x78\xdb\xf4";
const char kvm_asm64_cpl3[] =
    "\x0f\x20\xc0\x0d\x00\x00\x00\x80\x0f\x22\xc0\xea\xde\xc0\xad\x0b"
    "\x50\x00\x48\xc7\xc0\xd8\x00\x00\x00\x0f\x00\xd8\x48\xc7\xc0\x6b"
    "\x00\x00\x00\x8e\xd8\x8e\xc0\x8e\xe0\x8e\xe8\x48\xc7\xc4\x80\x0f"
    "\x00\x00\x48\xc7\x04\x24\x1d\xba\x00\x00\x48\xc7\x44\x24\x04\x63"
    "\x00\x00\x00\x48\xc7\x44\x24\x08\x80\x0f\x00\x00\x48\xc7\x44\x24"
    "\x0c\x6b\x00\x00\x00\xcb";

#define ADDR_TEXT 0x0000
#define ADDR_GDT 0x1000
#define ADDR_LDT 0x1800
#define ADDR_PML4 0x2000
#define ADDR_PDP 0x3000
#define ADDR_PD 0x4000
#define ADDR_STACK0 0x0f80
#define ADDR_VAR_HLT 0x2800
#define ADDR_VAR_SYSRET 0x2808
#define ADDR_VAR_SYSEXIT 0x2810
#define ADDR_VAR_IDT 0x3800
#define ADDR_VAR_TSS64 0x3a00
#define ADDR_VAR_TSS64_CPL3 0x3c00
#define ADDR_VAR_TSS16 0x3d00
#define ADDR_VAR_TSS16_2 0x3e00
#define ADDR_VAR_TSS16_CPL3 0x3f00
#define ADDR_VAR_TSS32 0x4800
#define ADDR_VAR_TSS32_2 0x4a00
#define ADDR_VAR_TSS32_CPL3 0x4c00
#define ADDR_VAR_TSS32_VM86 0x4e00
#define ADDR_VAR_VMXON_PTR 0x5f00
#define ADDR_VAR_VMCS_PTR 0x5f08
#define ADDR_VAR_VMEXIT_PTR 0x5f10
#define ADDR_VAR_VMWRITE_FLD 0x5f18
#define ADDR_VAR_VMWRITE_VAL 0x5f20
#define ADDR_VAR_VMXON 0x6000
#define ADDR_VAR_VMCS 0x7000
#define ADDR_VAR_VMEXIT_CODE 0x9000
#define ADDR_VAR_USER_CODE 0x9100
#define ADDR_VAR_USER_CODE2 0x9120

#define SEL_LDT (1 << 3)
#define SEL_CS16 (2 << 3)
#define SEL_DS16 (3 << 3)
#define SEL_CS16_CPL3 ((4 << 3) + 3)
#define SEL_DS16_CPL3 ((5 << 3) + 3)
#define SEL_CS32 (6 << 3)
#define SEL_DS32 (7 << 3)
#define SEL_CS32_CPL3 ((8 << 3) + 3)
#define SEL_DS32_CPL3 ((9 << 3) + 3)
#define SEL_CS64 (10 << 3)
#define SEL_DS64 (11 << 3)
#define SEL_CS64_CPL3 ((12 << 3) + 3)
#define SEL_DS64_CPL3 ((13 << 3) + 3)
#define SEL_CGATE16 (14 << 3)
#define SEL_TGATE16 (15 << 3)
#define SEL_CGATE32 (16 << 3)
#define SEL_TGATE32 (17 << 3)
#define SEL_CGATE64 (18 << 3)
#define SEL_CGATE64_HI (19 << 3)
#define SEL_TSS16 (20 << 3)
#define SEL_TSS16_2 (21 << 3)
#define SEL_TSS16_CPL3 ((22 << 3) + 3)
#define SEL_TSS32 (23 << 3)
#define SEL_TSS32_2 (24 << 3)
#define SEL_TSS32_CPL3 ((25 << 3) + 3)
#define SEL_TSS32_VM86 (26 << 3)
#define SEL_TSS64 (27 << 3)
#define SEL_TSS64_HI (28 << 3)
#define SEL_TSS64_CPL3 ((29 << 3) + 3)
#define SEL_TSS64_CPL3_HI (30 << 3)

#define MSR_IA32_FEATURE_CONTROL 0x3a
#define MSR_IA32_VMX_BASIC 0x480
#define MSR_IA32_SMBASE 0x9e
#define MSR_IA32_SYSENTER_CS 0x174
#define MSR_IA32_SYSENTER_ESP 0x175
#define MSR_IA32_SYSENTER_EIP 0x176
#define MSR_IA32_STAR 0xC0000081
#define MSR_IA32_LSTAR 0xC0000082
#define MSR_IA32_VMX_PROCBASED_CTLS2 0x48B

#define NEXT_INSN $0xbadc0de
#define PREFIX_SIZE 0xba1d

#define KVM_SMI _IO(KVMIO, 0xb7)

#define CR0_PE 1
#define CR0_MP (1 << 1)
#define CR0_EM (1 << 2)
#define CR0_TS (1 << 3)
#define CR0_ET (1 << 4)
#define CR0_NE (1 << 5)
#define CR0_WP (1 << 16)
#define CR0_AM (1 << 18)
#define CR0_NW (1 << 29)
#define CR0_CD (1 << 30)
#define CR0_PG (1 << 31)

#define CR4_VME 1
#define CR4_PVI (1 << 1)
#define CR4_TSD (1 << 2)
#define CR4_DE (1 << 3)
#define CR4_PSE (1 << 4)
#define CR4_PAE (1 << 5)
#define CR4_MCE (1 << 6)
#define CR4_PGE (1 << 7)
#define CR4_PCE (1 << 8)
#define CR4_OSFXSR (1 << 8)
#define CR4_OSXMMEXCPT (1 << 10)
#define CR4_UMIP (1 << 11)
#define CR4_VMXE (1 << 13)
#define CR4_SMXE (1 << 14)
#define CR4_FSGSBASE (1 << 16)
#define CR4_PCIDE (1 << 17)
#define CR4_OSXSAVE (1 << 18)
#define CR4_SMEP (1 << 20)
#define CR4_SMAP (1 << 21)
#define CR4_PKE (1 << 22)

#define EFER_SCE 1
#define EFER_LME (1 << 8)
#define EFER_LMA (1 << 10)
#define EFER_NXE (1 << 11)
#define EFER_SVME (1 << 12)
#define EFER_LMSLE (1 << 13)
#define EFER_FFXSR (1 << 14)
#define EFER_TCE (1 << 15)

#define PDE32_PRESENT 1
#define PDE32_RW (1 << 1)
#define PDE32_USER (1 << 2)
#define PDE32_PS (1 << 7)

#define PDE64_PRESENT 1
#define PDE64_RW (1 << 1)
#define PDE64_USER (1 << 2)
#define PDE64_ACCESSED (1 << 5)
#define PDE64_DIRTY (1 << 6)
#define PDE64_PS (1 << 7)
#define PDE64_G (1 << 8)

struct tss16 {
  uint16_t prev;
  uint16_t sp0;
  uint16_t ss0;
  uint16_t sp1;
  uint16_t ss1;
  uint16_t sp2;
  uint16_t ss2;
  uint16_t ip;
  uint16_t flags;
  uint16_t ax;
  uint16_t cx;
  uint16_t dx;
  uint16_t bx;
  uint16_t sp;
  uint16_t bp;
  uint16_t si;
  uint16_t di;
  uint16_t es;
  uint16_t cs;
  uint16_t ss;
  uint16_t ds;
  uint16_t ldt;
} __attribute__((packed));

struct tss32 {
  uint16_t prev, prevh;
  uint32_t sp0;
  uint16_t ss0, ss0h;
  uint32_t sp1;
  uint16_t ss1, ss1h;
  uint32_t sp2;
  uint16_t ss2, ss2h;
  uint32_t cr3;
  uint32_t ip;
  uint32_t flags;
  uint32_t ax;
  uint32_t cx;
  uint32_t dx;
  uint32_t bx;
  uint32_t sp;
  uint32_t bp;
  uint32_t si;
  uint32_t di;
  uint16_t es, esh;
  uint16_t cs, csh;
  uint16_t ss, ssh;
  uint16_t ds, dsh;
  uint16_t fs, fsh;
  uint16_t gs, gsh;
  uint16_t ldt, ldth;
  uint16_t trace;
  uint16_t io_bitmap;
} __attribute__((packed));

struct tss64 {
  uint32_t reserved0;
  uint64_t rsp[3];
  uint64_t reserved1;
  uint64_t ist[7];
  uint64_t reserved2;
  uint32_t reserved3;
  uint32_t io_bitmap;
} __attribute__((packed));

static void fill_segment_descriptor(uint64_t* dt, uint64_t* lt,
                                    struct kvm_segment* seg)
{
  uint16_t index = seg->selector >> 3;
  uint64_t limit = seg->g ? seg->limit >> 12 : seg->limit;
  uint64_t sd =
      (limit & 0xffff) | (seg->base & 0xffffff) << 16 |
      (uint64_t)seg->type << 40 | (uint64_t)seg->s << 44 |
      (uint64_t)seg->dpl << 45 | (uint64_t)seg->present << 47 |
      (limit & 0xf0000ULL) << 48 | (uint64_t)seg->avl << 52 |
      (uint64_t)seg->l << 53 | (uint64_t)seg->db << 54 |
      (uint64_t)seg->g << 55 | (seg->base & 0xff000000ULL) << 56;
  NONFAILING(dt[index] = sd);
  NONFAILING(lt[index] = sd);
}

static void fill_segment_descriptor_dword(uint64_t* dt, uint64_t* lt,
                                          struct kvm_segment* seg)
{
  fill_segment_descriptor(dt, lt, seg);
  uint16_t index = seg->selector >> 3;
  NONFAILING(dt[index + 1] = 0);
  NONFAILING(lt[index + 1] = 0);
}

static void setup_syscall_msrs(int cpufd, uint16_t sel_cs,
                               uint16_t sel_cs_cpl3)
{
  char buf[sizeof(struct kvm_msrs) + 5 * sizeof(struct kvm_msr_entry)];
  memset(buf, 0, sizeof(buf));
  struct kvm_msrs* msrs = (struct kvm_msrs*)buf;
  msrs->nmsrs = 5;
  msrs->entries[0].index = MSR_IA32_SYSENTER_CS;
  msrs->entries[0].data = sel_cs;
  msrs->entries[1].index = MSR_IA32_SYSENTER_ESP;
  msrs->entries[1].data = ADDR_STACK0;
  msrs->entries[2].index = MSR_IA32_SYSENTER_EIP;
  msrs->entries[2].data = ADDR_VAR_SYSEXIT;
  msrs->entries[3].index = MSR_IA32_STAR;
  msrs->entries[3].data =
      ((uint64_t)sel_cs << 32) | ((uint64_t)sel_cs_cpl3 << 48);
  msrs->entries[4].index = MSR_IA32_LSTAR;
  msrs->entries[4].data = ADDR_VAR_SYSRET;
  ioctl(cpufd, KVM_SET_MSRS, msrs);
}

static void setup_32bit_idt(struct kvm_sregs* sregs, char* host_mem,
                            uintptr_t guest_mem)
{
  sregs->idt.base = guest_mem + ADDR_VAR_IDT;
  sregs->idt.limit = 0x1ff;
  uint64_t* idt = (uint64_t*)(host_mem + sregs->idt.base);
  int i;
  for (i = 0; i < 32; i++) {
    struct kvm_segment gate;
    gate.selector = i << 3;
    switch (i % 6) {
    case 0:
      gate.type = 6;
      gate.base = SEL_CS16;
      break;
    case 1:
      gate.type = 7;
      gate.base = SEL_CS16;
      break;
    case 2:
      gate.type = 3;
      gate.base = SEL_TGATE16;
      break;
    case 3:
      gate.type = 14;
      gate.base = SEL_CS32;
      break;
    case 4:
      gate.type = 15;
      gate.base = SEL_CS32;
      break;
    case 6:
      gate.type = 11;
      gate.base = SEL_TGATE32;
      break;
    }
    gate.limit = guest_mem + ADDR_VAR_USER_CODE2;
    gate.present = 1;
    gate.dpl = 0;
    gate.s = 0;
    gate.g = 0;
    gate.db = 0;
    gate.l = 0;
    gate.avl = 0;
    fill_segment_descriptor(idt, idt, &gate);
  }
}

static void setup_64bit_idt(struct kvm_sregs* sregs, char* host_mem,
                            uintptr_t guest_mem)
{
  sregs->idt.base = guest_mem + ADDR_VAR_IDT;
  sregs->idt.limit = 0x1ff;
  uint64_t* idt = (uint64_t*)(host_mem + sregs->idt.base);
  int i;
  for (i = 0; i < 32; i++) {
    struct kvm_segment gate;
    gate.selector = (i * 2) << 3;
    gate.type = (i & 1) ? 14 : 15;
    gate.base = SEL_CS64;
    gate.limit = guest_mem + ADDR_VAR_USER_CODE2;
    gate.present = 1;
    gate.dpl = 0;
    gate.s = 0;
    gate.g = 0;
    gate.db = 0;
    gate.l = 0;
    gate.avl = 0;
    fill_segment_descriptor_dword(idt, idt, &gate);
  }
}

struct kvm_text {
  uintptr_t typ;
  const void* text;
  uintptr_t size;
};

struct kvm_opt {
  uint64_t typ;
  uint64_t val;
};

#define KVM_SETUP_PAGING (1 << 0)
#define KVM_SETUP_PAE (1 << 1)
#define KVM_SETUP_PROTECTED (1 << 2)
#define KVM_SETUP_CPL3 (1 << 3)
#define KVM_SETUP_VIRT86 (1 << 4)
#define KVM_SETUP_SMM (1 << 5)
#define KVM_SETUP_VM (1 << 6)

static uintptr_t syz_kvm_setup_cpu(uintptr_t a0, uintptr_t a1,
                                   uintptr_t a2, uintptr_t a3,
                                   uintptr_t a4, uintptr_t a5,
                                   uintptr_t a6, uintptr_t a7)
{
  const int vmfd = a0;
  const int cpufd = a1;
  char* const host_mem = (char*)a2;
  const struct kvm_text* const text_array_ptr = (struct kvm_text*)a3;
  const uintptr_t text_count = a4;
  const uintptr_t flags = a5;
  const struct kvm_opt* const opt_array_ptr = (struct kvm_opt*)a6;
  uintptr_t opt_count = a7;

  const uintptr_t page_size = 4 << 10;
  const uintptr_t ioapic_page = 10;
  const uintptr_t guest_mem_size = 24 * page_size;
  const uintptr_t guest_mem = 0;

  (void)text_count;
  int text_type = 0;
  const void* text = 0;
  uintptr_t text_size = 0;
  NONFAILING(text_type = text_array_ptr[0].typ);
  NONFAILING(text = text_array_ptr[0].text);
  NONFAILING(text_size = text_array_ptr[0].size);

  uintptr_t i;
  for (i = 0; i < guest_mem_size / page_size; i++) {
    struct kvm_userspace_memory_region memreg;
    memreg.slot = i;
    memreg.flags = 0;
    memreg.guest_phys_addr = guest_mem + i * page_size;
    if (i == ioapic_page)
      memreg.guest_phys_addr = 0xfec00000;
    memreg.memory_size = page_size;
    memreg.userspace_addr = (uintptr_t)host_mem + i * page_size;
    ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);
  }
  struct kvm_userspace_memory_region memreg;
  memreg.slot = 1 + (1 << 16);
  memreg.flags = 0;
  memreg.guest_phys_addr = 0x30000;
  memreg.memory_size = 64 << 10;
  memreg.userspace_addr = (uintptr_t)host_mem;
  ioctl(vmfd, KVM_SET_USER_MEMORY_REGION, &memreg);

  struct kvm_sregs sregs;
  if (ioctl(cpufd, KVM_GET_SREGS, &sregs))
    return -1;

  struct kvm_regs regs;
  memset(&regs, 0, sizeof(regs));
  regs.rip = guest_mem + ADDR_TEXT;
  regs.rsp = ADDR_STACK0;

  sregs.gdt.base = guest_mem + ADDR_GDT;
  sregs.gdt.limit = 256 * sizeof(uint64_t) - 1;
  uint64_t* gdt = (uint64_t*)(host_mem + sregs.gdt.base);

  struct kvm_segment seg_ldt;
  seg_ldt.selector = SEL_LDT;
  seg_ldt.type = 2;
  seg_ldt.base = guest_mem + ADDR_LDT;
  seg_ldt.limit = 256 * sizeof(uint64_t) - 1;
  seg_ldt.present = 1;
  seg_ldt.dpl = 0;
  seg_ldt.s = 0;
  seg_ldt.g = 0;
  seg_ldt.db = 1;
  seg_ldt.l = 0;
  sregs.ldt = seg_ldt;
  uint64_t* ldt = (uint64_t*)(host_mem + sregs.ldt.base);

  struct kvm_segment seg_cs16;
  seg_cs16.selector = SEL_CS16;
  seg_cs16.type = 11;
  seg_cs16.base = 0;
  seg_cs16.limit = 0xfffff;
  seg_cs16.present = 1;
  seg_cs16.dpl = 0;
  seg_cs16.s = 1;
  seg_cs16.g = 0;
  seg_cs16.db = 0;
  seg_cs16.l = 0;

  struct kvm_segment seg_ds16 = seg_cs16;
  seg_ds16.selector = SEL_DS16;
  seg_ds16.type = 3;

  struct kvm_segment seg_cs16_cpl3 = seg_cs16;
  seg_cs16_cpl3.selector = SEL_CS16_CPL3;
  seg_cs16_cpl3.dpl = 3;

  struct kvm_segment seg_ds16_cpl3 = seg_ds16;
  seg_ds16_cpl3.selector = SEL_DS16_CPL3;
  seg_ds16_cpl3.dpl = 3;

  struct kvm_segment seg_cs32 = seg_cs16;
  seg_cs32.selector = SEL_CS32;
  seg_cs32.db = 1;

  struct kvm_segment seg_ds32 = seg_ds16;
  seg_ds32.selector = SEL_DS32;
  seg_ds32.db = 1;

  struct kvm_segment seg_cs32_cpl3 = seg_cs32;
  seg_cs32_cpl3.selector = SEL_CS32_CPL3;
  seg_cs32_cpl3.dpl = 3;

  struct kvm_segment seg_ds32_cpl3 = seg_ds32;
  seg_ds32_cpl3.selector = SEL_DS32_CPL3;
  seg_ds32_cpl3.dpl = 3;

  struct kvm_segment seg_cs64 = seg_cs16;
  seg_cs64.selector = SEL_CS64;
  seg_cs64.l = 1;

  struct kvm_segment seg_ds64 = seg_ds32;
  seg_ds64.selector = SEL_DS64;

  struct kvm_segment seg_cs64_cpl3 = seg_cs64;
  seg_cs64_cpl3.selector = SEL_CS64_CPL3;
  seg_cs64_cpl3.dpl = 3;

  struct kvm_segment seg_ds64_cpl3 = seg_ds64;
  seg_ds64_cpl3.selector = SEL_DS64_CPL3;
  seg_ds64_cpl3.dpl = 3;

  struct kvm_segment seg_tss32;
  seg_tss32.selector = SEL_TSS32;
  seg_tss32.type = 9;
  seg_tss32.base = ADDR_VAR_TSS32;
  seg_tss32.limit = 0x1ff;
  seg_tss32.present = 1;
  seg_tss32.dpl = 0;
  seg_tss32.s = 0;
  seg_tss32.g = 0;
  seg_tss32.db = 0;
  seg_tss32.l = 0;

  struct kvm_segment seg_tss32_2 = seg_tss32;
  seg_tss32_2.selector = SEL_TSS32_2;
  seg_tss32_2.base = ADDR_VAR_TSS32_2;

  struct kvm_segment seg_tss32_cpl3 = seg_tss32;
  seg_tss32_cpl3.selector = SEL_TSS32_CPL3;
  seg_tss32_cpl3.base = ADDR_VAR_TSS32_CPL3;

  struct kvm_segment seg_tss32_vm86 = seg_tss32;
  seg_tss32_vm86.selector = SEL_TSS32_VM86;
  seg_tss32_vm86.base = ADDR_VAR_TSS32_VM86;

  struct kvm_segment seg_tss16 = seg_tss32;
  seg_tss16.selector = SEL_TSS16;
  seg_tss16.base = ADDR_VAR_TSS16;
  seg_tss16.limit = 0xff;
  seg_tss16.type = 1;

  struct kvm_segment seg_tss16_2 = seg_tss16;
  seg_tss16_2.selector = SEL_TSS16_2;
  seg_tss16_2.base = ADDR_VAR_TSS16_2;
  seg_tss16_2.dpl = 0;

  struct kvm_segment seg_tss16_cpl3 = seg_tss16;
  seg_tss16_cpl3.selector = SEL_TSS16_CPL3;
  seg_tss16_cpl3.base = ADDR_VAR_TSS16_CPL3;
  seg_tss16_cpl3.dpl = 3;

  struct kvm_segment seg_tss64 = seg_tss32;
  seg_tss64.selector = SEL_TSS64;
  seg_tss64.base = ADDR_VAR_TSS64;
  seg_tss64.limit = 0x1ff;

  struct kvm_segment seg_tss64_cpl3 = seg_tss64;
  seg_tss64_cpl3.selector = SEL_TSS64_CPL3;
  seg_tss64_cpl3.base = ADDR_VAR_TSS64_CPL3;
  seg_tss64_cpl3.dpl = 3;

  struct kvm_segment seg_cgate16;
  seg_cgate16.selector = SEL_CGATE16;
  seg_cgate16.type = 4;
  seg_cgate16.base = SEL_CS16 | (2 << 16);
  seg_cgate16.limit = ADDR_VAR_USER_CODE2;
  seg_cgate16.present = 1;
  seg_cgate16.dpl = 0;
  seg_cgate16.s = 0;
  seg_cgate16.g = 0;
  seg_cgate16.db = 0;
  seg_cgate16.l = 0;
  seg_cgate16.avl = 0;

  struct kvm_segment seg_tgate16 = seg_cgate16;
  seg_tgate16.selector = SEL_TGATE16;
  seg_tgate16.type = 3;
  seg_cgate16.base = SEL_TSS16_2;
  seg_tgate16.limit = 0;

  struct kvm_segment seg_cgate32 = seg_cgate16;
  seg_cgate32.selector = SEL_CGATE32;
  seg_cgate32.type = 12;
  seg_cgate32.base = SEL_CS32 | (2 << 16);

  struct kvm_segment seg_tgate32 = seg_cgate32;
  seg_tgate32.selector = SEL_TGATE32;
  seg_tgate32.type = 11;
  seg_tgate32.base = SEL_TSS32_2;
  seg_tgate32.limit = 0;

  struct kvm_segment seg_cgate64 = seg_cgate16;
  seg_cgate64.selector = SEL_CGATE64;
  seg_cgate64.type = 12;
  seg_cgate64.base = SEL_CS64;

  int kvmfd = open("/dev/kvm", O_RDWR);
  char buf[sizeof(struct kvm_cpuid2) +
           128 * sizeof(struct kvm_cpuid_entry2)];
  memset(buf, 0, sizeof(buf));
  struct kvm_cpuid2* cpuid = (struct kvm_cpuid2*)buf;
  cpuid->nent = 128;
  ioctl(kvmfd, KVM_GET_SUPPORTED_CPUID, cpuid);
  ioctl(cpufd, KVM_SET_CPUID2, cpuid);
  close(kvmfd);

  const char* text_prefix = 0;
  int text_prefix_size = 0;
  char* host_text = host_mem + ADDR_TEXT;

  if (text_type == 8) {
    if (flags & KVM_SETUP_SMM) {
      if (flags & KVM_SETUP_PROTECTED) {
        sregs.cs = seg_cs16;
        sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;
        sregs.cr0 |= CR0_PE;
      } else {
        sregs.cs.selector = 0;
        sregs.cs.base = 0;
      }

      NONFAILING(*(host_mem + ADDR_TEXT) = 0xf4);
      host_text = host_mem + 0x8000;

      ioctl(cpufd, KVM_SMI, 0);
    } else if (flags & KVM_SETUP_VIRT86) {
      sregs.cs = seg_cs32;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
      sregs.cr0 |= CR0_PE;
      sregs.efer |= EFER_SCE;

      setup_syscall_msrs(cpufd, SEL_CS32, SEL_CS32_CPL3);
      setup_32bit_idt(&sregs, host_mem, guest_mem);

      if (flags & KVM_SETUP_PAGING) {
        uint64_t pd_addr = guest_mem + ADDR_PD;
        uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
        NONFAILING(pd[0] = PDE32_PRESENT | PDE32_RW | PDE32_USER |
                           PDE32_PS);
        sregs.cr3 = pd_addr;
        sregs.cr4 |= CR4_PSE;

        text_prefix = kvm_asm32_paged_vm86;
        text_prefix_size = sizeof(kvm_asm32_paged_vm86) - 1;
      } else {
        text_prefix = kvm_asm32_vm86;
        text_prefix_size = sizeof(kvm_asm32_vm86) - 1;
      }
    } else {
      sregs.cs.selector = 0;
      sregs.cs.base = 0;
    }
  } else if (text_type == 16) {
    if (flags & KVM_SETUP_CPL3) {
      sregs.cs = seg_cs16;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;

      text_prefix = kvm_asm16_cpl3;
      text_prefix_size = sizeof(kvm_asm16_cpl3) - 1;
    } else {
      sregs.cr0 |= CR0_PE;
      sregs.cs = seg_cs16;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds16;
    }
  } else if (text_type == 32) {
    sregs.cr0 |= CR0_PE;
    sregs.efer |= EFER_SCE;

    setup_syscall_msrs(cpufd, SEL_CS32, SEL_CS32_CPL3);
    setup_32bit_idt(&sregs, host_mem, guest_mem);

    if (flags & KVM_SETUP_SMM) {
      sregs.cs = seg_cs32;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;

      NONFAILING(*(host_mem + ADDR_TEXT) = 0xf4);
      host_text = host_mem + 0x8000;

      ioctl(cpufd, KVM_SMI, 0);
    } else if (flags & KVM_SETUP_PAGING) {
      sregs.cs = seg_cs32;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;

      uint64_t pd_addr = guest_mem + ADDR_PD;
      uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
      NONFAILING(pd[0] =
                     PDE32_PRESENT | PDE32_RW | PDE32_USER | PDE32_PS);
      sregs.cr3 = pd_addr;
      sregs.cr4 |= CR4_PSE;

      text_prefix = kvm_asm32_paged;
      text_prefix_size = sizeof(kvm_asm32_paged) - 1;
    } else if (flags & KVM_SETUP_CPL3) {
      sregs.cs = seg_cs32_cpl3;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss =
          seg_ds32_cpl3;
    } else {
      sregs.cs = seg_cs32;
      sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;
    }
  } else {
    sregs.efer |= EFER_LME | EFER_SCE;
    sregs.cr0 |= CR0_PE;

    setup_syscall_msrs(cpufd, SEL_CS64, SEL_CS64_CPL3);
    setup_64bit_idt(&sregs, host_mem, guest_mem);

    sregs.cs = seg_cs32;
    sregs.ds = sregs.es = sregs.fs = sregs.gs = sregs.ss = seg_ds32;

    uint64_t pml4_addr = guest_mem + ADDR_PML4;
    uint64_t* pml4 = (uint64_t*)(host_mem + ADDR_PML4);
    uint64_t pdpt_addr = guest_mem + ADDR_PDP;
    uint64_t* pdpt = (uint64_t*)(host_mem + ADDR_PDP);
    uint64_t pd_addr = guest_mem + ADDR_PD;
    uint64_t* pd = (uint64_t*)(host_mem + ADDR_PD);
    NONFAILING(pml4[0] =
                   PDE64_PRESENT | PDE64_RW | PDE64_USER | pdpt_addr);
    NONFAILING(pdpt[0] =
                   PDE64_PRESENT | PDE64_RW | PDE64_USER | pd_addr);
    NONFAILING(pd[0] =
                   PDE64_PRESENT | PDE64_RW | PDE64_USER | PDE64_PS);
    sregs.cr3 = pml4_addr;
    sregs.cr4 |= CR4_PAE;

    if (flags & KVM_SETUP_VM) {
      sregs.cr0 |= CR0_NE;

      NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMXON_PTR)) =
                     ADDR_VAR_VMXON);
      NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMCS_PTR)) =
                     ADDR_VAR_VMCS);
      NONFAILING(memcpy(host_mem + ADDR_VAR_VMEXIT_CODE,
                        kvm_asm64_vm_exit,
                        sizeof(kvm_asm64_vm_exit) - 1));
      NONFAILING(*((uint64_t*)(host_mem + ADDR_VAR_VMEXIT_PTR)) =
                     ADDR_VAR_VMEXIT_CODE);

      text_prefix = kvm_asm64_init_vm;
      text_prefix_size = sizeof(kvm_asm64_init_vm) - 1;
    } else if (flags & KVM_SETUP_CPL3) {
      text_prefix = kvm_asm64_cpl3;
      text_prefix_size = sizeof(kvm_asm64_cpl3) - 1;
    } else {
      text_prefix = kvm_asm64_enable_long;
      text_prefix_size = sizeof(kvm_asm64_enable_long) - 1;
    }
  }

  struct tss16 tss16;
  memset(&tss16, 0, sizeof(tss16));
  tss16.ss0 = tss16.ss1 = tss16.ss2 = SEL_DS16;
  tss16.sp0 = tss16.sp1 = tss16.sp2 = ADDR_STACK0;
  tss16.ip = ADDR_VAR_USER_CODE2;
  tss16.flags = (1 << 1);
  tss16.cs = SEL_CS16;
  tss16.es = tss16.ds = tss16.ss = SEL_DS16;
  tss16.ldt = SEL_LDT;
  struct tss16* tss16_addr =
      (struct tss16*)(host_mem + seg_tss16_2.base);
  NONFAILING(memcpy(tss16_addr, &tss16, sizeof(tss16)));

  memset(&tss16, 0, sizeof(tss16));
  tss16.ss0 = tss16.ss1 = tss16.ss2 = SEL_DS16;
  tss16.sp0 = tss16.sp1 = tss16.sp2 = ADDR_STACK0;
  tss16.ip = ADDR_VAR_USER_CODE2;
  tss16.flags = (1 << 1);
  tss16.cs = SEL_CS16_CPL3;
  tss16.es = tss16.ds = tss16.ss = SEL_DS16_CPL3;
  tss16.ldt = SEL_LDT;
  struct tss16* tss16_cpl3_addr =
      (struct tss16*)(host_mem + seg_tss16_cpl3.base);
  NONFAILING(memcpy(tss16_cpl3_addr, &tss16, sizeof(tss16)));

  struct tss32 tss32;
  memset(&tss32, 0, sizeof(tss32));
  tss32.ss0 = tss32.ss1 = tss32.ss2 = SEL_DS32;
  tss32.sp0 = tss32.sp1 = tss32.sp2 = ADDR_STACK0;
  tss32.ip = ADDR_VAR_USER_CODE;
  tss32.flags = (1 << 1) | (1 << 17);
  tss32.ldt = SEL_LDT;
  tss32.cr3 = sregs.cr3;
  tss32.io_bitmap = offsetof(struct tss32, io_bitmap);
  struct tss32* tss32_addr =
      (struct tss32*)(host_mem + seg_tss32_vm86.base);
  NONFAILING(memcpy(tss32_addr, &tss32, sizeof(tss32)));

  memset(&tss32, 0, sizeof(tss32));
  tss32.ss0 = tss32.ss1 = tss32.ss2 = SEL_DS32;
  tss32.sp0 = tss32.sp1 = tss32.sp2 = ADDR_STACK0;
  tss32.ip = ADDR_VAR_USER_CODE;
  tss32.flags = (1 << 1);
  tss32.cr3 = sregs.cr3;
  tss32.es = tss32.ds = tss32.ss = tss32.gs = tss32.fs = SEL_DS32;
  tss32.cs = SEL_CS32;
  tss32.ldt = SEL_LDT;
  tss32.cr3 = sregs.cr3;
  tss32.io_bitmap = offsetof(struct tss32, io_bitmap);
  struct tss32* tss32_cpl3_addr =
      (struct tss32*)(host_mem + seg_tss32_2.base);
  NONFAILING(memcpy(tss32_cpl3_addr, &tss32, sizeof(tss32)));

  struct tss64 tss64;
  memset(&tss64, 0, sizeof(tss64));
  tss64.rsp[0] = ADDR_STACK0;
  tss64.rsp[1] = ADDR_STACK0;
  tss64.rsp[2] = ADDR_STACK0;
  tss64.io_bitmap = offsetof(struct tss64, io_bitmap);
  struct tss64* tss64_addr = (struct tss64*)(host_mem + seg_tss64.base);
  NONFAILING(memcpy(tss64_addr, &tss64, sizeof(tss64)));

  memset(&tss64, 0, sizeof(tss64));
  tss64.rsp[0] = ADDR_STACK0;
  tss64.rsp[1] = ADDR_STACK0;
  tss64.rsp[2] = ADDR_STACK0;
  tss64.io_bitmap = offsetof(struct tss64, io_bitmap);
  struct tss64* tss64_cpl3_addr =
      (struct tss64*)(host_mem + seg_tss64_cpl3.base);
  NONFAILING(memcpy(tss64_cpl3_addr, &tss64, sizeof(tss64)));

  if (text_size > 1000)
    text_size = 1000;
  if (text_prefix) {
    NONFAILING(memcpy(host_text, text_prefix, text_prefix_size));
    void* patch = 0;
    NONFAILING(patch = memmem(host_text, text_prefix_size,
                              "\xde\xc0\xad\x0b", 4));
    if (patch)
      NONFAILING(*((uint32_t*)patch) = guest_mem + ADDR_TEXT +
                                       ((char*)patch - host_text) + 6);
    uint16_t magic = PREFIX_SIZE;
    patch = 0;
    NONFAILING(patch = memmem(host_text, text_prefix_size, &magic,
                              sizeof(magic)));
    if (patch)
      NONFAILING(*((uint16_t*)patch) =
                     guest_mem + ADDR_TEXT + text_prefix_size);
  }
  NONFAILING(
      memcpy((void*)(host_text + text_prefix_size), text, text_size));
  NONFAILING(*(host_text + text_prefix_size + text_size) = 0xf4);

  NONFAILING(memcpy(host_mem + ADDR_VAR_USER_CODE, text, text_size));
  NONFAILING(*(host_mem + ADDR_VAR_USER_CODE + text_size) = 0xf4);

  NONFAILING(*(host_mem + ADDR_VAR_HLT) = 0xf4);
  NONFAILING(memcpy(host_mem + ADDR_VAR_SYSRET, "\x0f\x07\xf4", 3));
  NONFAILING(memcpy(host_mem + ADDR_VAR_SYSEXIT, "\x0f\x35\xf4", 3));

  NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_FLD) = 0);
  NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_VAL) = 0);

  if (opt_count > 2)
    opt_count = 2;
  for (i = 0; i < opt_count; i++) {
    uint64_t typ = 0;
    uint64_t val = 0;
    NONFAILING(typ = opt_array_ptr[i].typ);
    NONFAILING(val = opt_array_ptr[i].val);
    switch (typ % 9) {
    case 0:
      sregs.cr0 ^= val & (CR0_MP | CR0_EM | CR0_ET | CR0_NE | CR0_WP |
                          CR0_AM | CR0_NW | CR0_CD);
      break;
    case 1:
      sregs.cr4 ^= val & (CR4_VME | CR4_PVI | CR4_TSD | CR4_DE |
                          CR4_MCE | CR4_PGE | CR4_PCE | CR4_OSFXSR |
                          CR4_OSXMMEXCPT | CR4_UMIP | CR4_VMXE |
                          CR4_SMXE | CR4_FSGSBASE | CR4_PCIDE |
                          CR4_OSXSAVE | CR4_SMEP | CR4_SMAP | CR4_PKE);
      break;
    case 2:
      sregs.efer ^= val & (EFER_SCE | EFER_NXE | EFER_SVME |
                           EFER_LMSLE | EFER_FFXSR | EFER_TCE);
      break;
    case 3:
      val &= ((1 << 8) | (1 << 9) | (1 << 10) | (1 << 12) | (1 << 13) |
              (1 << 14) | (1 << 15) | (1 << 18) | (1 << 19) |
              (1 << 20) | (1 << 21));
      regs.rflags ^= val;
      NONFAILING(tss16_addr->flags ^= val);
      NONFAILING(tss16_cpl3_addr->flags ^= val);
      NONFAILING(tss32_addr->flags ^= val);
      NONFAILING(tss32_cpl3_addr->flags ^= val);
      break;
    case 4:
      seg_cs16.type = val & 0xf;
      seg_cs32.type = val & 0xf;
      seg_cs64.type = val & 0xf;
      break;
    case 5:
      seg_cs16_cpl3.type = val & 0xf;
      seg_cs32_cpl3.type = val & 0xf;
      seg_cs64_cpl3.type = val & 0xf;
      break;
    case 6:
      seg_ds16.type = val & 0xf;
      seg_ds32.type = val & 0xf;
      seg_ds64.type = val & 0xf;
      break;
    case 7:
      seg_ds16_cpl3.type = val & 0xf;
      seg_ds32_cpl3.type = val & 0xf;
      seg_ds64_cpl3.type = val & 0xf;
      break;
    case 8:
      NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_FLD) =
                     (val & 0xffff));
      NONFAILING(*(uint64_t*)(host_mem + ADDR_VAR_VMWRITE_VAL) =
                     (val >> 16));
      break;
    default:
      fail("bad kvm setup opt");
    }
  }
  regs.rflags |= 2;

  fill_segment_descriptor(gdt, ldt, &seg_ldt);
  fill_segment_descriptor(gdt, ldt, &seg_cs16);
  fill_segment_descriptor(gdt, ldt, &seg_ds16);
  fill_segment_descriptor(gdt, ldt, &seg_cs16_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_ds16_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_cs32);
  fill_segment_descriptor(gdt, ldt, &seg_ds32);
  fill_segment_descriptor(gdt, ldt, &seg_cs32_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_ds32_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_cs64);
  fill_segment_descriptor(gdt, ldt, &seg_ds64);
  fill_segment_descriptor(gdt, ldt, &seg_cs64_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_ds64_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_tss32);
  fill_segment_descriptor(gdt, ldt, &seg_tss32_2);
  fill_segment_descriptor(gdt, ldt, &seg_tss32_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_tss32_vm86);
  fill_segment_descriptor(gdt, ldt, &seg_tss16);
  fill_segment_descriptor(gdt, ldt, &seg_tss16_2);
  fill_segment_descriptor(gdt, ldt, &seg_tss16_cpl3);
  fill_segment_descriptor_dword(gdt, ldt, &seg_tss64);
  fill_segment_descriptor_dword(gdt, ldt, &seg_tss64_cpl3);
  fill_segment_descriptor(gdt, ldt, &seg_cgate16);
  fill_segment_descriptor(gdt, ldt, &seg_tgate16);
  fill_segment_descriptor(gdt, ldt, &seg_cgate32);
  fill_segment_descriptor(gdt, ldt, &seg_tgate32);
  fill_segment_descriptor_dword(gdt, ldt, &seg_cgate64);

  if (ioctl(cpufd, KVM_SET_SREGS, &sregs))
    return -1;
  if (ioctl(cpufd, KVM_SET_REGS, &regs))
    return -1;
  return 0;
}

static void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 128 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  unshare(CLONE_NEWNS);
  unshare(CLONE_NEWIPC);
  unshare(CLONE_IO);
}

static int do_sandbox_none(int executor_pid, bool enable_tun)
{
  int pid = fork();
  if (pid)
    return pid;

  sandbox_common();
  setup_tun(executor_pid, enable_tun);

  loop();
  doexit(1);
}

static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exitf("opendir(%s) failed due to NOFILE, exiting");
    }
    exitf("opendir(%s) failed", dir);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    struct stat st;
    if (lstat(filename, &st))
      exitf("lstat(%s) failed", filename);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exitf("unlink(%s) failed", filename);
      if (umount2(filename, MNT_DETACH))
        exitf("umount(%s) failed", filename);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exitf("umount(%s) failed", dir);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exitf("rmdir(%s) failed", dir);
  }
}

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[256];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      fail("failed to mkdir");
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      if (chdir(cwdbuf))
        fail("failed to chdir");
      flush_tun();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
    remove_dir(cwdbuf);
  }
}

long r[82];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   r[0], 0x0ul);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20dab000,
                      "\x2f\x64\x65\x76\x2f\x6b\x76\x6d\x00", 9));
    r[2] = syscall(__NR_openat, 0xffffffffffffff9cul, 0x20dab000ul,
                   0x5ul, 0x0ul);
    break;
  case 2:
    r[3] = syscall(__NR_ioctl, r[2], 0xae01ul, 0x0ul);
    break;
  case 3:
    r[4] = syscall(__NR_ioctl, r[3], 0xae41ul, 0x2ul);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x20601000 = (uint32_t)0x48);
    r[6] = syscall(__NR_getpeername, r[0], 0x208d7fb8ul, 0x20601000ul);
    break;
  case 5:
    r[7] = syscall(__NR_socket, 0x1ful, 0x0ul, 0x3ul);
    break;
  case 6:
    NONFAILING(*(uint64_t*)0x20c66fe0 = r[0]);
    NONFAILING(*(uint64_t*)0x20c66fe8 = r[0]);
    NONFAILING(*(uint64_t*)0x20c66ff0 = r[0]);
    NONFAILING(*(uint64_t*)0x20c66ff8 = r[0]);
    r[12] = syscall(__NR_setitimer, 0x2ul, 0x20c66fe0ul, 0x20000000ul);
    break;
  case 7:
    r[13] = syscall(__NR_shmget, 0x798dd813ul, 0x4000ul, 0x400ul,
                    0x205d2000ul);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x202afffc = (uint32_t)0x10);
    r[15] = syscall(__NR_getpeername, r[0], 0x20395ff0ul, 0x202afffcul);
    break;
  case 9:
    NONFAILING(*(uint32_t*)0x20640000 = (uint32_t)0x6);
    NONFAILING(*(uint32_t*)0x20640004 = r[0]);
    NONFAILING(*(uint32_t*)0x20640008 = r[0]);
    NONFAILING(*(uint32_t*)0x2064000c = r[0]);
    NONFAILING(*(uint32_t*)0x20640010 = r[0]);
    NONFAILING(*(uint32_t*)0x20640014 = (uint32_t)0x2);
    NONFAILING(*(uint16_t*)0x20640018 = (uint16_t)0x8001);
    NONFAILING(*(uint16_t*)0x2064001a = (uint16_t)0x0);
    NONFAILING(*(uint64_t*)0x20640020 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20640028 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x20640030 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20640038 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20640040 = (uint64_t)0x4);
    NONFAILING(*(uint64_t*)0x20640048 = (uint64_t)0x3);
    NONFAILING(*(uint32_t*)0x20640050 = r[0]);
    NONFAILING(*(uint32_t*)0x20640054 = r[0]);
    NONFAILING(*(uint16_t*)0x20640058 = (uint16_t)0x81);
    NONFAILING(*(uint16_t*)0x2064005a = (uint16_t)0x0);
    NONFAILING(*(uint64_t*)0x20640060 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20640068 = (uint64_t)0x0);
    r[36] = syscall(__NR_shmctl, r[13], 0x1ul, 0x20640000ul);
    break;
  case 10:
    NONFAILING(*(uint64_t*)0x20271fc0 = (uint64_t)0x8000000000000000);
    NONFAILING(*(uint64_t*)0x20271fc8 = (uint64_t)0x6);
    NONFAILING(*(uint64_t*)0x20271fd0 = (uint64_t)0x1);
    NONFAILING(*(uint64_t*)0x20271fd8 = (uint64_t)0x1);
    NONFAILING(*(uint8_t*)0x20271fe0 = (uint8_t)0x1b);
    NONFAILING(*(uint8_t*)0x20271fe1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe3 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20271fe7 = (uint8_t)0x0);
    NONFAILING(*(uint64_t*)0x20271fe8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20271ff0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20271ff8 = (uint64_t)0x0);
    r[52] = syscall(__NR_ioctl, r[4], 0x4040ae9eul, 0x20271fc0ul);
    break;
  case 11:
    NONFAILING(*(uint64_t*)0x20b5ffe8 = (uint64_t)0x20);
    NONFAILING(*(uint64_t*)0x20b5fff0 = (uint64_t)0x20840000);
    NONFAILING(*(uint64_t*)0x20b5fff8 = (uint64_t)0x52);
    NONFAILING(memcpy((void*)0x20840000,
                      "\xb9\x80\x00\x00\xc0\x0f\x32\x35\x01\x00\x00\x00"
                      "\x8e\xe0\x65\x0f\xc7\x2b\x0f\x09\xc4\xe1\xbb\xc2"
                      "\xd7\xb7\x67\x67\x36\xf2\x6d\x66\xba\xf8\x0c\xb8"
                      "\x50\x63\x6b\x8a\xef\x66\xba\xfc\x0c\x66\xb8\x00"
                      "\x80\x66\xef\xb9\x80\x00\x00\xc0\x0f\x32\x35\x00"
                      "\x08\x00\x00\x0f\x30\x0f\x32\xc4\xe2\xed\xba\x6c"
                      "\x13\x00\x2e\x66\x66\x0f\xf4\x5c\xd8\x00",
                      82));
    NONFAILING(*(uint64_t*)0x20c24000 = (uint64_t)0x3);
    NONFAILING(*(uint64_t*)0x20c24008 = (uint64_t)0x4040);
    NONFAILING(*(uint64_t*)0x20c24010 = (uint64_t)0x4);
    NONFAILING(*(uint64_t*)0x20c24018 = (uint64_t)0x9);
    r[61] = syz_kvm_setup_cpu(r[0], r[4], 0x204b0000ul, 0x20b5ffe8ul,
                              0x1ul, 0x1ul, 0x20c24000ul, 0x2ul);
    break;
  case 12:
    NONFAILING(*(uint64_t*)0x20ae1000 = (uint64_t)0x20);
    NONFAILING(*(uint64_t*)0x20ae1008 = (uint64_t)0x20f2a000);
    NONFAILING(*(uint64_t*)0x20ae1010 = (uint64_t)0x39);
    NONFAILING(memcpy((void*)0x20f2a000,
                      "\x66\x0f\x38\x81\x1a\x0f\xc7\x2b\x66\xba\xf8\x0c"
                      "\xb8\xea\x01\xa6\x86\xef\x66\xba\xfc\x0c\x66\xed"
                      "\xc4\xc2\x41\xa6\x71\x00\x0f\xc7\x1a\x79\x89\x0f"
                      "\x01\xd1\x0f\x01\xdf\x0f\x20\xc0\x35\x00\x00\x00"
                      "\x80\x0f\x22\xc0\xc4\xc2\xcd\xbd\x37",
                      57));
    NONFAILING(*(uint64_t*)0x20ae1000 = (uint64_t)0x7);
    NONFAILING(*(uint64_t*)0x20ae1008 = (uint64_t)0xf);
    r[68] = syz_kvm_setup_cpu(r[0], r[4], 0x201b3000ul, 0x20ae1000ul,
                              0x1ul, 0x0ul, 0x20ae1000ul, 0x1ul);
    break;
  case 13:
    NONFAILING(*(uint32_t*)0x201fd000 = (uint32_t)0x8);
    NONFAILING(*(uint64_t*)0x201fd008 = (uint64_t)0x20914000);
    r[71] = syscall(__NR_ioctl, r[0], 0xc0106426ul, 0x201fd000ul);
    break;
  case 14:
    NONFAILING(*(uint8_t*)0x202e2000 = (uint8_t)0x1);
    NONFAILING(*(uint64_t*)0x20f88ff8 = (uint64_t)0x1);
    r[74] = syscall(__NR_getsockopt, r[7], 0x112ul, 0x9ul, 0x202e2000ul,
                    0x20f88ff8ul);
    break;
  case 15:
    NONFAILING(*(uint32_t*)0x20a4cffc = (uint32_t)0x2ff107ba);
    r[76] = syscall(__NR_setsockopt, r[0], 0x112ul, 0x8ul, 0x20a4cffcul,
                    0x4ul);
    break;
  case 16:
    r[77] = syscall(__NR_ioctl, r[4], 0xae80ul);
    break;
  case 17:
    NONFAILING(memcpy(
        (void*)0x2027cc00,
        "\x06\xfc\xdc\x3c\x5d\xd7\x55\x74\x75\xa6\x79\xd3\x15\x44\xf4"
        "\xcf\xd0\xf6\xa1\xf6\xd3\x2b\x2a\x46\x85\x5c\xc9\x12\xcb\x01"
        "\x1b\x8a\xbb\x9d\x20\x09\x67\x00\x07\x1f\x60\x6b\x9b\x1b\xf8"
        "\x46\x5f\xb7\xe4\x7f\x83\xf2\xa3\x11\xc1\x27\x36\xb5\xb8\x2c"
        "\xb0\x8a\x1e\x5a\xa8\x8c\x62\x6f\x55\x17\xac\x2c\xf9\x38\x25"
        "\x2a\x1c\x84\x8c\x11\x12\x21\x6a\x17\x23\xd2\x52\x9d\x70\xf5"
        "\x2f\x63\xac\xf0\xb1\xfc\x31\x8b\x64\x26\xcf\xea\xc5\x8a\x18"
        "\x3b\x55\x9f\x28\x95\xfe\x33\xd9\xc7\x07\xfa\x8b\xbb\x5e\x08"
        "\x5e\x59\xb4\xdb\xcc\x7a\xa0\x64\x77\x04\x99\x67\xbe\x0a\x5f"
        "\xc9\x00\xba\x7d\x55\x91\x0b\x57\x24\x2e\x60\xd1\x97\x44\x39"
        "\x7f\x56\x51\xa1\x4f\x83\x44\x4d\x52\xf7\x07\x9c\x7e\xcf\xe9"
        "\x07\xea\x53\x10\x06\x47\x7a\x58\x80\xea\x3e\x77\x93\x71\x89"
        "\x85\x7e\x3b\xdc\x8a\x89\x13\xed\xa3\x44\x0b\x2f\x72\x0c\xe0"
        "\x20\x35\xcc\x52\x12\xdf\x0e\x53\xc4\xa1\x02\x84\xcf\xa8\x25"
        "\xb1\xa8\x26\x9a\x4e\xe2\x69\x5b\x0b\x3f\xed\x7d\x9c\x2c\x44"
        "\x4c\x76\x5e\x45\x16\x74\x92\x1f\xcf\xad\xfe\x6f\x83\xcd\x44"
        "\xfb\x7c\x28\x53\x12\x6c\x6d\x20\x9f\x89\x70\xf1\xb0\xb7\x52"
        "\xc3\xd9\x04\x2a\x43\x37\x4c\x14\x99\xa4\x60\x8d\x55\x7f\x63"
        "\x9c\x1c\x39\xb9\x94\xbd\x19\xd6\x9d\x4d\xdc\x3c\x7c\x18\xc3"
        "\x0a\x20\x65\x50\x22\xa4\x23\xca\xa5\xd9\x91\x69\x87\x95\x31"
        "\x52\xb5\x6a\xeb\xf9\x86\xd7\x80\x6e\x3e\x78\x92\xd9\xcf\x2f"
        "\x99\xcd\xd4\xd1\x3d\x60\xda\xa5\xe4\xba\x24\x70\xcb\x06\xb3"
        "\x87\x15\x85\xcc\xc6\xf1\x9d\xd8\x06\xe1\xc1\xf3\x0f\x4f\x28"
        "\x16\xc8\x96\x73\xad\x39\x55\xae\x16\x7a\xa2\xac\xa1\xf4\xb5"
        "\x94\x59\x13\x42\x93\x95\x24\x1e\x21\xf7\x7e\xa4\x00\x73\x84"
        "\x14\xc4\x9a\x6a\xe3\x48\xe2\x31\xc8\xb7\x04\x41\xcd\x52\xc5"
        "\x6d\x3d\x36\x03\x8e\x1c\x0b\x5f\x5b\x6d\x88\x34\xa4\x1c\x6b"
        "\xae\x50\x31\xac\x34\x1c\x62\xf1\x28\xa3\x33\x44\xd9\x98\x55"
        "\x24\x14\x76\x7f\x96\x6d\xbf\x63\x81\xb0\x0e\xaa\xd1\x61\xde"
        "\x73\x88\xe3\x37\xc6\xa8\xce\x95\x9e\xa0\x8b\x60\xfc\x53\x73"
        "\x54\xf8\xce\xae\x3d\xf4\xb0\xd4\x20\xb9\xff\xd0\xce\x93\x71"
        "\x36\x6e\xcb\xc1\xa5\x85\x40\xd8\xef\x1f\x33\x33\x94\x84\x0a"
        "\xad\xdb\x96\x02\x48\xfc\xd7\xd8\x4f\xbf\x1d\x85\x75\x51\x4b"
        "\x0c\xfe\x0a\xa6\x30\x23\x1a\x06\xcb\x76\x77\xff\xad\xf2\x13"
        "\x9b\x64\x7d\x9e\xc3\xa9\x1d\x5b\x4f\xaa\x83\x6f\x76\xf0\x4a"
        "\xd1\xb0\x36\xe9\x0f\x55\xc8\x74\x1a\x9c\xb4\x60\xb1\x76\x17"
        "\xd7\xb2\x23\x12\x49\x48\xe4\x83\x18\x6b\x8b\x31\x81\xa9\x20"
        "\xe9\x7c\x9e\x58\x9f\x39\x2f\xbd\xea\x05\x8d\x3d\x7b\xbd\xed"
        "\x3e\xa5\xc3\xa9\x2b\x19\xeb\x58\x6e\xc6\xad\x60\x0f\x82\x31"
        "\x51\xcb\x58\xa6\xe0\x3f\xb8\x3e\xf2\xba\x48\x10\x5b\xf9\xa8"
        "\x55\x00\x43\xb0\x89\x9f\xd8\xcc\xed\x79\x14\x64\xb8\x16\x68"
        "\x84\xf6\xa2\xea\xde\xda\x67\x7d\x09\x4c\x4f\x0d\x4d\xce\xd7"
        "\xe8\x79\x12\x5e\x6b\xde\x44\xaf\x1f\xdf\xbb\x42\x01\xe5\xa4"
        "\x07\x92\xe4\x80\x60\xb5\x62\x29\xa8\x99\x15\x48\x3a\xf7\xe5"
        "\xdf\x13\xed\xa4\xf3\xef\x30\x3f\xa7\x29\xba\x04\xfa\xea\xa3"
        "\xf9\x34\x18\xdb\x4a\x69\xd2\x5e\x39\xe7\x7e\x3a\xb5\x55\xae"
        "\xf1\xbb\x27\x76\xb1\xe7\x75\xc6\xd1\x6c\x54\x32\xad\x3f\x35"
        "\x36\x88\xad\x5d\x4e\x6e\x50\x01\xfd\x6e\xbd\x33\x9f\xbf\x3a"
        "\xc4\x5a\x6d\xdf\xb4\x2d\xb6\x9c\x4d\x64\xb0\xec\x33\xa0\x34"
        "\x45\x98\x0a\x9e\x2d\xd5\x20\x6f\x86\xfb\x55\x45\xb1\x3f\x8a"
        "\xb9\xb3\x6a\x7f\x73\xdb\x3b\xc7\x53\x29\x79\x9f\x43\x61\xd2"
        "\xc7\x48\x53\xa9\x7d\xd9\x90\x37\x0d\x6d\x16\xd1\xbd\xf2\x57"
        "\x2d\xdc\x51\x13\xf8\xef\x28\x48\x27\x58\x37\xd9\x33\x97\x5c"
        "\x19\x34\x55\x01\x23\x42\xca\x30\x8b\x94\xc6\x2c\x7c\xc3\xb3"
        "\x75\x17\x19\x5b\x81\xcb\x38\xfa\xf1\x0b\x1e\x66\x4e\xf4\x8d"
        "\x8d\xe9\x0d\x67\x18\xcb\x9c\xeb\xaf\x8e\x02\x01\x79\x20\x5d"
        "\x4a\x6b\xec\xad\x29\x90\xee\x26\x96\x14\xac\x80\x33\x1a\x80"
        "\xaf\x0b\xa2\x42\x7b\x10\xf9\xa3\x19\xbc\x68\x36\xf1\x94\x25"
        "\xf4\x9e\x09\xe2\x55\xc3\x13\x26\xbc\x12\x86\x82\x37\x2e\x3b"
        "\x56\x64\x44\xc0\x72\xbb\xad\xe8\xfb\xcc\xcd\x2c\xf0\x72\xd7"
        "\xf3\xa7\x68\x51\x01\xa8\x8f\xbe\x94\xae\x9a\x19\x65\x93\xc2"
        "\x6f\x24\x1d\x99\x6c\xb4\xb0\xf9\x83\x37\xfb\xe6\xfa\xf0\xed"
        "\x1f\xb2\x0a\x50\xdf\xf3\x57\x7a\x04\xb5\x0b\x6d\x1a\x58\xdc"
        "\x00\xcb\x65\xec\x44\x67\x03\x61\x32\x68\xd2\xe6\x21\xd4\xe9"
        "\xcc\xcf\x51\x9e\x5d\x1b\x2c\x46\x40\x88\x09\x65\x01\x78\x50"
        "\xcf\x37\xb3\xda\x88\x20\xe1\x62\x32\xeb\x6b\xe0\xb6\x9f\x65"
        "\x67\x76\x3f\x06\x28\xbf\xa5\x22\x6b\xec\x9f\xdc\x81\xbc\x4c"
        "\x8f\x0d\xbc\x79\x3c\x27\x0a\xdc\x26\x52\x1c\xba\x17\xb8\x37"
        "\xda\xe2\xbe\xfd",
        1024));
    r[79] = syscall(__NR_ioctl, r[0], 0x4400ae8ful, 0x2027cc00ul);
    break;
  case 18:
    r[80] = syscall(__NR_get_mempolicy, 0x200d6ffcul, 0x2046d000ul,
                    0x0ul, 0x20168000ul, 0x7d409b92451d7741ul);
    break;
  case 19:
    r[81] = syscall(__NR_ioctl, r[4], 0xae80ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[40];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 20; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 20; i++) {
    pthread_create(&th[20 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      install_segv_handler();
      use_temporary_dir();
      int pid = do_sandbox_none(i, true);
      int status = 0;
      while (waitpid(pid, &status, __WALL) != pid) {
      }
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}