syzkaller-repros/linux/36f02426ba2760cb1ea20a476b629923272ec28a.c

// KASAN: use-after-free Read in snd_seq_queue_alloc
// https://syzkaller.appspot.com/bug?id=36f02426ba2760cb1ea20a476b629923272ec28a
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_tun.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <net/if_arp.h>
#include <pthread.h>
#include <sched.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/ioctl.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.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);
}

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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block",
            (uint8_t)a1, (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    NONFAILING(strncpy(buf, (char*)a0, sizeof(buf)));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 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 = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &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 test();

void loop()
{
  while (1) {
    test();
  }
}

long r[168];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0x813000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    NONFAILING(memcpy(
        (void*)0x20036ff3,
        "\x2f\x64\x65\x76\x2f\x73\x6e\x64\x2f\x73\x65\x71\x00", 13));
    r[2] = syz_open_dev(0x20036ff3ul, 0x0ul, 0x0ul);
    break;
  case 2:
    NONFAILING(*(uint64_t*)0x20046000 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046008 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046010 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046018 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046020 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046028 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046030 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046038 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037000 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037008 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037010 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037018 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037020 = (uint64_t)0x5);
    NONFAILING(*(uint64_t*)0x20037028 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037030 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20037038 = (uint64_t)0xaee);
    NONFAILING(*(uint64_t*)0x20046fc0 = (uint64_t)0x8);
    NONFAILING(*(uint64_t*)0x20046fc8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046fd0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046fd8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046fe0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046fe8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046ff0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046ff8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046ff0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046ff8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x20046000 = (uint64_t)0x2002b000);
    NONFAILING(*(uint64_t*)0x20046008 = (uint64_t)0x8);
    NONFAILING(*(uint64_t*)0x2002b000 = (uint64_t)0x0);
    r[32] = syscall(__NR_pselect6, 0x40ul, 0x20046000ul, 0x20037000ul,
                    0x20046fc0ul, 0x20046ff0ul, 0x20046000ul);
    break;
  case 3:
    NONFAILING(*(uint32_t*)0x20045000 = (uint32_t)0xffff);
    NONFAILING(*(uint32_t*)0x20045004 = (uint32_t)0x8);
    NONFAILING(*(uint32_t*)0x20045008 = (uint32_t)0x5);
    NONFAILING(
        memcpy((void*)0x2004500c,
               "\x6c\xd7\x69\xd0\x02\x4e\x6a\xc8\xe9\xf8\x75\xb5\xd3"
               "\x61\xb6\xe8\xf4\x1d\x31\x41\x97\x98\xbf\xe7\xc0\x27"
               "\xc2\x4a\xd0\x3c\x85\x8b\x70\x2b\xca\xbb\x14\xda\x79"
               "\x94\x1a\x51\x88\x0c\xae\x57\xed\x25\x81\x58\x52\x59"
               "\x57\xd5\x74\xd5\x75\xb6\xe0\xc3\x7f\x01\xb6\x94",
               64));
    NONFAILING(*(uint32_t*)0x2004504c = (uint32_t)0x2);
    NONFAILING(*(uint8_t*)0x20045050 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045051 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045052 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045053 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045054 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045055 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045056 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045057 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045058 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045059 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505b = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505c = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505d = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505e = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004505f = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045060 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045061 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045062 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045063 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045064 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045065 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045066 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045067 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045068 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045069 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506b = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506c = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506d = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506e = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004506f = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045070 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045071 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045072 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045073 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045074 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045075 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045076 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045077 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045078 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045079 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507b = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507c = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507d = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507e = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004507f = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045080 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045081 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045082 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045083 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045084 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045085 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045086 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045087 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045088 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045089 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004508a = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2004508b = (uint8_t)0x0);
    r[98] = syscall(__NR_ioctl, r[2], 0xc08c5332ul, 0x20045000ul);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x20045f74 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20045f78 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20045f7c = (uint32_t)0x0);
    NONFAILING(
        memcpy((void*)0x20045f80,
               "\x71\x75\x65\x75\x65\x31\x00\x00\x00\x00\x00\x00\x00"
               "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
               "\x00\x00\xec\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
               "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
               "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
               64));
    NONFAILING(*(uint32_t*)0x20045fc0 = (uint32_t)0x2);
    NONFAILING(*(uint8_t*)0x20045fc4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fc5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fc6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fc7 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fc8 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fc9 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fca = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fcb = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fcc = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fcd = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fce = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fcf = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd3 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd7 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd8 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fd9 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fda = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fdb = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fdc = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fdd = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fde = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fdf = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe3 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe7 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe8 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fe9 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fea = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045feb = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fec = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fed = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fee = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fef = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff3 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff4 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff5 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff6 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff7 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff8 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ff9 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ffa = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ffb = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ffc = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ffd = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045ffe = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20045fff = (uint8_t)0x0);
    r[164] = syscall(__NR_ioctl, r[2], 0x408c5333ul, 0x20045f74ul);
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20035ff0 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x20035ff8 = (uint64_t)0x20519000);
    r[167] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0xc010641dul,
                     0x20035ff0ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[12];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 6; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 6; i++) {
    pthread_create(&th[6 + 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;
}