syzkaller-repros/linux/17e202b4794da213570ba33ac2f70277ef1ce015.c

// WARNING: refcount bug in put_pid_ns
// https://syzkaller.appspot.com/bug?id=17e202b4794da213570ba33ac2f70277ef1ce015
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/capability.h>
#include <linux/futex.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 <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.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 <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);
}

static void exitf(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(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);
}

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
#define PATH_PREFIX                                                            \
  "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin "
#define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1)

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

  va_start(args, format);
  memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN);
  vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args);
  rv = system(command);
  if (panic && rv != 0)
    fail("tun: command \"%s\" failed with code %d", &command[0], rv);

  va_end(args);
}

static int tunfd = -1;
static int tun_frags_enabled;

#define SYZ_TUN_MAX_PACKET_SIZE 1000

#define TUN_IFACE "syz_tun"

#define LOCAL_MAC "aa:aa:aa:aa:aa:aa"
#define REMOTE_MAC "aa:aa:aa:aa:aa:bb"

#define LOCAL_IPV4 "172.20.20.170"
#define REMOTE_IPV4 "172.20.20.187"

#define LOCAL_IPV6 "fe80::aa"
#define REMOTE_IPV6 "fe80::bb"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

static void initialize_tun(void)
{
  tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
  if (tunfd == -1) {
    printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
    printf("otherwise fuzzing or reproducing might not work as intended\n");
    return;
  }
  const int kTunFd = 252;
  if (dup2(tunfd, kTunFd) < 0)
    fail("dup2(tunfd, kTunFd) failed");
  close(tunfd);
  tunfd = kTunFd;

  struct ifreq ifr;
  memset(&ifr, 0, sizeof(ifr));
  strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
  ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
  if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
      fail("tun: ioctl(TUNSETIFF) failed");
  }
  if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
    fail("tun: ioctl(TUNGETIFF) failed");
  tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;

  execute_command(1, "sysctl -w net.ipv6.conf.%s.accept_dad=0", TUN_IFACE);

  execute_command(1, "sysctl -w net.ipv6.conf.%s.router_solicitations=0",
                  TUN_IFACE);

  execute_command(1, "ip link set dev %s address %s", TUN_IFACE, LOCAL_MAC);
  execute_command(1, "ip addr add %s/24 dev %s", LOCAL_IPV4, TUN_IFACE);
  execute_command(1, "ip -6 addr add %s/120 dev %s", LOCAL_IPV6, TUN_IFACE);
  execute_command(1, "ip neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV4, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip -6 neigh add %s lladdr %s dev %s nud permanent",
                  REMOTE_IPV6, REMOTE_MAC, TUN_IFACE);
  execute_command(1, "ip link set dev %s up", TUN_IFACE);
}

#define DEV_IPV4 "172.20.20.%d"
#define DEV_IPV6 "fe80::%02hx"
#define DEV_MAC "aa:aa:aa:aa:aa:%02hx"

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "veth"};
  const char* devnames[] = {"lo",       "sit0",    "bridge0", "vcan0",
                            "tunl0",    "gre0",    "gretap0", "ip_vti0",
                            "ip6_vti0", "ip6tnl0", "ip6gre0", "ip6gretap0",
                            "erspan0",  "bond0",   "veth0",   "veth1"};

  for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++)
    execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]);
  execute_command(0, "ip link add dev veth1 type veth");
  for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) {
    char addr[32];
    snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10);
    execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10);
    execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]);
    snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10);
    execute_command(0, "ip link set dev %s address %s", devnames[i], addr);
    execute_command(0, "ip link set dev %s up", devnames[i]);
  }
}

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 bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);

  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

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 = 32 << 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);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

static int real_uid;
static int real_gid;
__attribute__((aligned(64 << 10))) static char sandbox_stack[1 << 20];

static int namespace_sandbox_proc(void* arg)
{
  sandbox_common();

  write_file("/proc/self/setgroups", "deny");
  if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid))
    fail("write of /proc/self/uid_map failed");
  if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid))
    fail("write of /proc/self/gid_map failed");

  if (unshare(CLONE_NEWNET))
    fail("unshare(CLONE_NEWNET)");
  initialize_tun();
  initialize_netdevices();

  if (mkdir("./syz-tmp", 0777))
    fail("mkdir(syz-tmp) failed");
  if (mount("", "./syz-tmp", "tmpfs", 0, NULL))
    fail("mount(tmpfs) failed");
  if (mkdir("./syz-tmp/newroot", 0777))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/dev", 0700))
    fail("mkdir failed");
  unsigned mount_flags = MS_BIND | MS_REC | MS_PRIVATE;
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL, mount_flags, NULL))
    fail("mount(dev) failed");
  if (mkdir("./syz-tmp/newroot/proc", 0700))
    fail("mkdir failed");
  if (mount(NULL, "./syz-tmp/newroot/proc", "proc", 0, NULL))
    fail("mount(proc) failed");
  if (mkdir("./syz-tmp/newroot/selinux", 0700))
    fail("mkdir failed");
  const char* selinux_path = "./syz-tmp/newroot/selinux";
  if (mount("/selinux", selinux_path, NULL, mount_flags, NULL)) {
    if (errno != ENOENT)
      fail("mount(/selinux) failed");
    if (mount("/sys/fs/selinux", selinux_path, NULL, mount_flags, NULL) &&
        errno != ENOENT)
      fail("mount(/sys/fs/selinux) failed");
  }
  if (mkdir("./syz-tmp/newroot/sys", 0700))
    fail("mkdir failed");
  if (mount(NULL, "./syz-tmp/newroot/sys", "sysfs", 0, NULL))
    fail("mount(sysfs) failed");
  if (mkdir("./syz-tmp/pivot", 0777))
    fail("mkdir failed");
  if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) {
    if (chdir("./syz-tmp"))
      fail("chdir failed");
  } else {
    if (chdir("/"))
      fail("chdir failed");
    if (umount2("./pivot", MNT_DETACH))
      fail("umount failed");
  }
  if (chroot("./newroot"))
    fail("chroot failed");
  if (chdir("/"))
    fail("chdir failed");

  struct __user_cap_header_struct cap_hdr = {};
  struct __user_cap_data_struct cap_data[2] = {};
  cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
  cap_hdr.pid = getpid();
  if (syscall(SYS_capget, &cap_hdr, &cap_data))
    fail("capget failed");
  cap_data[0].effective &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].permitted &= ~(1 << CAP_SYS_PTRACE);
  cap_data[0].inheritable &= ~(1 << CAP_SYS_PTRACE);
  if (syscall(SYS_capset, &cap_hdr, &cap_data))
    fail("capset failed");

  loop();
  doexit(1);
}

static int do_sandbox_namespace(void)
{
  int pid;

  real_uid = getuid();
  real_gid = getgid();
  mprotect(sandbox_stack, 4096, PROT_NONE);
  pid =
      clone(namespace_sandbox_proc, &sandbox_stack[sizeof(sandbox_stack) - 64],
            CLONE_NEWUSER | CLONE_NEWPID, 0);
  if (pid < 0)
    fail("sandbox clone failed");
  return pid;
}

static int inject_fault(int nth)
{
  int fd;
  char buf[16];

  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exitf("failed to open /proc/thread-self/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exitf("failed to write /proc/thread-self/fail-nth");
  return fd;
}

static void execute_one();
extern unsigned long long procid;

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

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[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff,
                 0x0, 0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x200003c0, "/dev/loop#", 11));
    res = syz_open_dev(0x200003c0, 8, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 1:
    NONFAILING(*(uint64_t*)0x20000780 = 0x20000400);
    NONFAILING(memcpy(
        (void*)0x20000400,
        "\x84\xd5\xae\xf1\x60\x3c\xb0\x20\xc5\xb2\x19\xfa\xa7\x57\x91\x3e\xc8"
        "\x5e\xe7\x4a\x15\x5e\x1d\x63\x55\x66\x77\x7b\x78\x60\x0b\xc6\x5b\xf0"
        "\x1c\xe3\x3d\xe9\xa6\xbc\x3a\x20\x41\x89\x0d\xf0\x92\x6f\x2c\xfc\x2a"
        "\x7d\x63\x69\x0f\x6b\x55\x61\x05\x93\x77\x30\x41\x75\x5f\x61\xb0\x34"
        "\xe3\xa6\x2a\x77\x08\x55\xb2\xc0\x48\x1d\xf2\x19\xef\xbf\xa8\xff\xd0"
        "\xc6\x65\x43\x4a\x1d\xe0\x26\xbc\xfb\x65\x4d\x59\x7e\xf7\x7a\x7b\x23"
        "\x1a\xa9\xef\xe4\x5c\x53\x81\x1c\x75\x91\xd5\x6f\x69\xe9\xc6\x23\x1e"
        "\x6d\xa9\x93\xbb\xd2\xa6\x13\x38\x05\xbe\x0c\x18\xba\x11\x4c\xfe\x86"
        "\x5e\x69\x30\x24\xa5\x6c\x33\x31\xb9\x3c\x03\xe2\x59\x27\xa5\x04\xd2"
        "\x7a\xce\xbf\x7e\xec\xd3\x3d\x7c\x69\x35\x9e\x3c\xa3\x7d\xc5\x46\xc4"
        "\xfc\x5b\xc6\x25\x96\xa9\x4c\xdc\x00\xf9\xb9\x73\x61\x6a\x9d\x2e\xba"
        "\xd2\xd9\xb3\xe6\x02\x61\xae\x73\xb8\x39\x76\x94\xe1\xf0\x85\x14\x75"
        "\xb4\x23\x6f\xb4\x79\x89\xe6\xbf\xd1\xad\x92\x6a\x01\x52\x3d\xf3\xf6"
        "\x89\xdc\x26\x03\xa7\x6b\x5f\xc5\xe0\x23\xd5\x44\x9d\x06\x6d\x42\x4d"
        "\x10\x01\xfe\xe5\xd6\x53\xc2\x1f\xdb\x75\x1e\x95\xff\x2b",
        252));
    NONFAILING(*(uint64_t*)0x20000788 = 0xfc);
    syscall(__NR_pwritev, r[0], 0x20000780, 1, 0);
    break;
  case 2:
    NONFAILING(memcpy((void*)0x200001c0, "/dev/snd/seq", 13));
    res = syz_open_dev(0x200001c0, 0, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 3:
    NONFAILING(*(uint32_t*)0x2019ffe9 = 0xc1);
    NONFAILING(*(uint32_t*)0x2019fff1 = 0);
    NONFAILING(*(uint8_t*)0x201a0001 = 0);
    NONFAILING(*(uint8_t*)0x201a0002 = 0);
    NONFAILING(*(uint8_t*)0x201a0003 = 0);
    NONFAILING(*(uint8_t*)0x201a0004 = 0);
    NONFAILING(*(uint32_t*)0x201a0005 = 0);
    NONFAILING(*(uint8_t*)0x201a0009 = 0);
    NONFAILING(*(uint32_t*)0x201a000d = 0);
    NONFAILING(*(uint32_t*)0x201a0011 = 0);
    NONFAILING(*(uint32_t*)0x201a0015 = 0);
    NONFAILING(*(uint32_t*)0x201a0019 = 0);
    NONFAILING(*(uint32_t*)0x201a001d = 0);
    NONFAILING(*(uint32_t*)0x201a0021 = 0);
    NONFAILING(*(uint32_t*)0x201a0025 = 0);
    NONFAILING(*(uint32_t*)0x201a0029 = 0);
    NONFAILING(*(uint32_t*)0x201a002d = 0);
    NONFAILING(*(uint32_t*)0x201a0031 = 0);
    syscall(__NR_ioctl, r[1], 0x4040534e, 0x2019ffe9);
    break;
  case 4:
    NONFAILING(*(uint32_t*)0x20000180 = 0x80);
    res = syscall(__NR_accept, -1, 0x20000080, 0x20000180);
    if (res != -1)
      r[2] = res;
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20000280 = 0x3f);
    syscall(__NR_ioctl, -1, 0x89e1, 0x20000280);
    break;
  case 6:
    NONFAILING(*(uint64_t*)0x20000200 = 0x80);
    NONFAILING(*(uint16_t*)0x20000208 = 2);
    NONFAILING(*(uint16_t*)0x2000020a = htobe16(0x4e20));
    NONFAILING(*(uint8_t*)0x2000020c = 0xac);
    NONFAILING(*(uint8_t*)0x2000020d = 0x14);
    NONFAILING(*(uint8_t*)0x2000020e = 0x14);
    NONFAILING(*(uint8_t*)0x2000020f = 0x19);
    NONFAILING(*(uint8_t*)0x20000210 = 0);
    NONFAILING(*(uint8_t*)0x20000211 = 0);
    NONFAILING(*(uint8_t*)0x20000212 = 0);
    NONFAILING(*(uint8_t*)0x20000213 = 0);
    NONFAILING(*(uint8_t*)0x20000214 = 0);
    NONFAILING(*(uint8_t*)0x20000215 = 0);
    NONFAILING(*(uint8_t*)0x20000216 = 0);
    NONFAILING(*(uint8_t*)0x20000217 = 0);
    NONFAILING(*(uint16_t*)0x20000218 = 2);
    NONFAILING(*(uint16_t*)0x2000021a = htobe16(0x4e21));
    NONFAILING(*(uint8_t*)0x2000021c = 0xac);
    NONFAILING(*(uint8_t*)0x2000021d = 0x14);
    NONFAILING(*(uint8_t*)0x2000021e = 0x14);
    NONFAILING(*(uint8_t*)0x2000021f = 0xaa);
    NONFAILING(*(uint8_t*)0x20000220 = 0);
    NONFAILING(*(uint8_t*)0x20000221 = 0);
    NONFAILING(*(uint8_t*)0x20000222 = 0);
    NONFAILING(*(uint8_t*)0x20000223 = 0);
    NONFAILING(*(uint8_t*)0x20000224 = 0);
    NONFAILING(*(uint8_t*)0x20000225 = 0);
    NONFAILING(*(uint8_t*)0x20000226 = 0);
    NONFAILING(*(uint8_t*)0x20000227 = 0);
    NONFAILING(*(uint16_t*)0x20000228 = 2);
    NONFAILING(*(uint16_t*)0x2000022a = htobe16(0x4e23));
    NONFAILING(*(uint32_t*)0x2000022c = htobe32(0));
    NONFAILING(*(uint8_t*)0x20000230 = 0);
    NONFAILING(*(uint8_t*)0x20000231 = 0);
    NONFAILING(*(uint8_t*)0x20000232 = 0);
    NONFAILING(*(uint8_t*)0x20000233 = 0);
    NONFAILING(*(uint8_t*)0x20000234 = 0);
    NONFAILING(*(uint8_t*)0x20000235 = 0);
    NONFAILING(*(uint8_t*)0x20000236 = 0);
    NONFAILING(*(uint8_t*)0x20000237 = 0);
    NONFAILING(*(uint16_t*)0x20000238 = 0);
    NONFAILING(*(uint16_t*)0x2000023a = 7);
    NONFAILING(*(uint64_t*)0x20000240 = 1);
    NONFAILING(*(uint64_t*)0x20000248 = 9);
    NONFAILING(*(uint16_t*)0x20000250 = 9);
    NONFAILING(*(uint64_t*)0x20000258 = 0);
    NONFAILING(*(uint64_t*)0x20000260 = 0);
    NONFAILING(*(uint64_t*)0x20000268 = 0);
    NONFAILING(*(uint16_t*)0x20000270 = 0xfff7);
    syscall(__NR_ioctl, r[2], 0x890d, 0x20000200);
    break;
  case 7:
    NONFAILING(*(uint32_t*)0x20000ac0 = 0);
    NONFAILING(*(uint16_t*)0x20000ac4 = 2);
    NONFAILING(*(uint16_t*)0x20000ac6 = htobe16(0x4e20));
    NONFAILING(*(uint32_t*)0x20000ac8 = htobe32(0x7f000001));
    NONFAILING(*(uint8_t*)0x20000acc = 0);
    NONFAILING(*(uint8_t*)0x20000acd = 0);
    NONFAILING(*(uint8_t*)0x20000ace = 0);
    NONFAILING(*(uint8_t*)0x20000acf = 0);
    NONFAILING(*(uint8_t*)0x20000ad0 = 0);
    NONFAILING(*(uint8_t*)0x20000ad1 = 0);
    NONFAILING(*(uint8_t*)0x20000ad2 = 0);
    NONFAILING(*(uint8_t*)0x20000ad3 = 0);
    NONFAILING(*(uint32_t*)0x200002c0 = 0x84);
    res = syscall(__NR_getsockopt, -1, 0x84, 6, 0x20000ac0, 0x200002c0);
    if (res != -1)
      NONFAILING(r[3] = *(uint32_t*)0x20000ac0);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x20000300 = r[3]);
    NONFAILING(*(uint32_t*)0x20000304 = 0x1c9);
    syscall(__NR_setsockopt, r[2], 0x84, 0x76, 0x20000300, 8);
    break;
  case 9:
    NONFAILING(memcpy((void*)0x20000700, "/dev/sg#", 9));
    syz_open_dev(0x20000700, 0xfffffffffffffff7, 0x800);
    break;
  case 10:
    NONFAILING(memcpy(
        (void*)0x20000800,
        "\x97\xbb\x77\x03\x8a\xdd\x5d\xf9\xe9\xd4\xf9\x78\x3b\x82\xc5\x5f\xe5"
        "\x9e\x5c\x0a\xcd\xbc\xfc\x9b\xcf\x92\xac\x0e\x1f\x1f\x3c\x19\x59\xc1"
        "\xd2\x5d\xfa\xbf\x38\x49\x33\x6c\x7c\x85\xbe\x17\x4d\x77\x65\xb4\x7e"
        "\x11\x36\x32\xae\xa5\x4b\x87\xe4\xd3\xf2\xc1\xdb\x09\xe6\xaa\x40\x40"
        "\xb4\x3d\x17\x30\x8f\xb7\xe6\x2e\x80\x80\x67\xda\x2f\xff\x3c\xfd\x8e"
        "\x4c\x03\x8c\x81\x4b\xbf\xc6\xbc\x49\xd8\xeb\xc8\x67\x1d\x82\x97\xe2"
        "\xd3\x4d\xc6\x1f\x2d\x19\x4d\x2d\xbb\x8f\x59\xb4\xc8\x53\xe0\x71\x4d"
        "\x3d\x4b\xb2\x9d\x12\x43\xfa\xc0\x1c\x86\xc8\xc4\xdd\x38\xda\xed\xab"
        "\x3c\x6a\xd7\x3a\x72\xd3\xf6\xdd\x26\x84\xaa\x82\xe5\x28\x5e\xb8\x24"
        "\x52\xc9\x84\x8b\x7b\xeb\x8b\xc5\x13\xba\x8c\x89\x73\xca\xd0\xbd\x59"
        "\x26\x60\x48\x46\xb7\xf5\xd0\x39\x7b\xb1\x91\xc3\xbb\x6b",
        184));
    NONFAILING(memcpy(
        (void*)0x20000940,
        "\xed\x6c\x04\x41\x2e\x78\x2f\xe3\x95\xf0\x84\x74\x1e\x3d\x9f\xe4\x69"
        "\xae\xbd\xe0\x9a\xcc\x8f\x8d\x8d\x84\xd1\xf0\x0f\x55\x73\xb0\x9a\xcb"
        "\xa4\x87\x07\x7e\xbb\x90\x4c\xb1\xf3\xfe\xd5\x5f\x59\xd6\x77\xce\x24"
        "\xbb\xd2\xa7\x50\x6d\xf8\xe1\xe0\xd0\xfc\x70\x9c\xb8\xc9\xf4\xab\x2a"
        "\xee\xee\xbc\x5e\xf8\x79\x74\x2c\x1f\x76\x28\xf1\x86\x2c\x88\xb5\xb0"
        "\xda\x89\xac\xbf\x43\xef\x12\xe4\x83\x94\x05\xb6\xa3\x43\x0d\x29\x6f"
        "\xea\x06\xd2\xf3\xa8\x35\x6c\x57\xec\x99\x1e\x44\xee\x72",
        116));
    write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
    write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
    inject_fault(40);
    syscall(__NR_clone, 0x2000c100, 0x20000800, 0x200008c0, 0x20000900,
            0x20000940);
    break;
  case 11:
    NONFAILING(memcpy(
        (void*)0x200009c0,
        "\x69\x70\x36\x67\x72\x65\x74\x61\x70\x30\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint16_t*)0x200009d0 = 2);
    NONFAILING(*(uint16_t*)0x200009d2 = htobe16(0x4e24));
    NONFAILING(*(uint32_t*)0x200009d4 = htobe32(0));
    NONFAILING(*(uint8_t*)0x200009d8 = 0);
    NONFAILING(*(uint8_t*)0x200009d9 = 0);
    NONFAILING(*(uint8_t*)0x200009da = 0);
    NONFAILING(*(uint8_t*)0x200009db = 0);
    NONFAILING(*(uint8_t*)0x200009dc = 0);
    NONFAILING(*(uint8_t*)0x200009dd = 0);
    NONFAILING(*(uint8_t*)0x200009de = 0);
    NONFAILING(*(uint8_t*)0x200009df = 0);
    syscall(__NR_ioctl, r[2], 0x891c, 0x200009c0);
    break;
  case 12:
    NONFAILING(*(uint8_t*)0x20ec6fb0 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fb1 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fb2 = 0x80);
    NONFAILING(*(uint8_t*)0x20ec6fb3 = 0);
    NONFAILING(*(uint32_t*)0x20ec6fb4 = 0);
    NONFAILING(*(uint32_t*)0x20ec6fb8 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fbc = 0);
    NONFAILING(*(uint8_t*)0x20ec6fbd = 0);
    NONFAILING(*(uint8_t*)0x20ec6fbe = 0);
    NONFAILING(*(uint8_t*)0x20ec6fbf = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc0 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc1 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc2 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc3 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc4 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc5 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc6 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc7 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc8 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fc9 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fca = 0);
    NONFAILING(*(uint8_t*)0x20ec6fcb = 0);
    NONFAILING(*(uint8_t*)0x20ec6fcc = 0);
    NONFAILING(*(uint8_t*)0x20ec6fcd = 0);
    NONFAILING(*(uint8_t*)0x20ec6fce = 0);
    NONFAILING(*(uint8_t*)0x20ec6fcf = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd0 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd1 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd2 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd3 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd4 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd5 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd6 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd7 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd8 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fd9 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fda = 0);
    NONFAILING(*(uint8_t*)0x20ec6fdb = 0);
    NONFAILING(*(uint8_t*)0x20ec6fdc = 0);
    NONFAILING(*(uint8_t*)0x20ec6fdd = 0);
    NONFAILING(*(uint8_t*)0x20ec6fde = 0);
    NONFAILING(*(uint8_t*)0x20ec6fdf = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe0 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe1 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe2 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe3 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe4 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe5 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe6 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe7 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe8 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fe9 = 0);
    NONFAILING(*(uint8_t*)0x20ec6fea = 0);
    NONFAILING(*(uint8_t*)0x20ec6feb = 0);
    NONFAILING(*(uint8_t*)0x20ec6fec = 0);
    NONFAILING(*(uint8_t*)0x20ec6fed = 0);
    NONFAILING(*(uint8_t*)0x20ec6fee = 0);
    NONFAILING(*(uint8_t*)0x20ec6fef = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff0 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff1 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff2 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff3 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff4 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff5 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff6 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff7 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff8 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ff9 = 0);
    NONFAILING(*(uint8_t*)0x20ec6ffa = 0);
    NONFAILING(*(uint8_t*)0x20ec6ffb = 0);
    NONFAILING(*(uint8_t*)0x20ec6ffc = 0);
    NONFAILING(*(uint8_t*)0x20ec6ffd = 0);
    NONFAILING(*(uint8_t*)0x20ec6ffe = 0);
    NONFAILING(*(uint8_t*)0x20ec6fff = 0);
    syscall(__NR_ioctl, r[1], 0x40505330, 0x20ec6fb0);
    break;
  case 13:
    NONFAILING(*(uint32_t*)0x20000380 = 4);
    syscall(__NR_getsockopt, r[2], 0x103, 1, 0x20000000, 0x20000380);
    break;
  case 14:
    NONFAILING(memcpy((void*)0x20000600, "/dev/adsp#", 11));
    syz_open_dev(0x20000600, 0x100000000, 0x80000);
    break;
  case 15:
    NONFAILING(memcpy(
        (void*)0x20000500,
        "\x67\xcd\xd9\x99\x4c\x47\xc3\x1d\x32\x5b\x06\x99\x24\xa7\x06\x4c\x15"
        "\x7c\x2e\xc0\xb5\xb5\xdc\xa2\xfe\xeb\x7d\xab\xef\x3b\x7a\xf0\xd0\x2d"
        "\x55\x9e\x29\x3f\xaa\x75\x9f\x2b\x3c\xb1\x2a\xea\x36\x0c\x2d\x49\x41"
        "\xe4\x23\xb0\xc8\x15\xec\x14\x50\xa7\x77\x61\x4b\x02\x49\x6c\x5c\x4c"
        "\xe5\x89\xc4\xe9\x0b\x88\xfe\xb6\x6f\x42\xe6\x32\x27\xae\xc8\xec\x98"
        "\x3c\xb7\x0e\x64\xac\x04\xda\x22\xc9\x7d\x2b\x22",
        97));
    NONFAILING(memcpy(
        (void*)0x20000a00,
        "\x29\x85\x9f\xdd\xa9\xa1\x19\xe5\x4a\x27\xf9\xec\x76\xb4\xd6\x3a\x16"
        "\xdc\x5b\xbd\xd3\x8c\x2f\xda\x0e\x5f\x4d\x8f\x83\x0c\xd9\x87\xec\x7d"
        "\x3f\xfc\x66\xcf\x3d\xb8\x82\x09\x68\xfd\x89\xa1\xfb\xa8\xfe\x63\x52"
        "\xa2\x9a\x27\xf3\xb0\x00\xbc\xdf\x23\x8f\x2c\x04\xb3\x58\xfc\x83\x10"
        "\x25\x18\x0e\x0b\xe3\x13\xda\x41\xde\x63\x66\xc9\x4a\x1a\x0f\x86\xaa"
        "\xff\xdf\x2c\x03\x91\x11\xb5\x52\x75\xc0\x54\xe1\x48\x19\xa8\x27\xfe"
        "\x80\x92\x25\x24\x9a\x01\x94\x42\x63\xa2\xae\xc1\x5f\x64\xe7\x52\xe3"
        "\x58\x92\xb1\xb8\xe7\xef\x1e\x0e\x91\x15",
        129));
    syscall(__NR_clone, 0, 0x20000500, 0x20000580, 0x200005c0, 0x20000a00);
    break;
  case 16:
    NONFAILING(*(uint8_t*)0x20000b80 = 4);
    NONFAILING(*(uint8_t*)0x20000b81 = 8);
    NONFAILING(memcpy(
        (void*)0x20000b82,
        "\x70\x6f\x72\x74\x30\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\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*)0x20000bc4 = 0x80);
    NONFAILING(*(uint32_t*)0x20000bc8 = 0x40);
    NONFAILING(*(uint32_t*)0x20000bcc = 0x10000);
    NONFAILING(*(uint32_t*)0x20000bd0 = 6);
    NONFAILING(*(uint32_t*)0x20000bd4 = 2);
    NONFAILING(*(uint32_t*)0x20000bd8 = 0x80);
    NONFAILING(*(uint32_t*)0x20000bdc = 8);
    NONFAILING(*(uint64_t*)0x20000be0 = 0);
    NONFAILING(*(uint32_t*)0x20000be8 = 0);
    NONFAILING(*(uint32_t*)0x20000bec = 0x3dec00);
    NONFAILING(*(uint8_t*)0x20000bf0 = 0);
    NONFAILING(*(uint8_t*)0x20000bf1 = 0);
    NONFAILING(*(uint8_t*)0x20000bf2 = 0);
    NONFAILING(*(uint8_t*)0x20000bf3 = 0);
    NONFAILING(*(uint8_t*)0x20000bf4 = 0);
    NONFAILING(*(uint8_t*)0x20000bf5 = 0);
    NONFAILING(*(uint8_t*)0x20000bf6 = 0);
    NONFAILING(*(uint8_t*)0x20000bf7 = 0);
    NONFAILING(*(uint8_t*)0x20000bf8 = 0);
    NONFAILING(*(uint8_t*)0x20000bf9 = 0);
    NONFAILING(*(uint8_t*)0x20000bfa = 0);
    NONFAILING(*(uint8_t*)0x20000bfb = 0);
    NONFAILING(*(uint8_t*)0x20000bfc = 0);
    NONFAILING(*(uint8_t*)0x20000bfd = 0);
    NONFAILING(*(uint8_t*)0x20000bfe = 0);
    NONFAILING(*(uint8_t*)0x20000bff = 0);
    NONFAILING(*(uint8_t*)0x20000c00 = 0);
    NONFAILING(*(uint8_t*)0x20000c01 = 0);
    NONFAILING(*(uint8_t*)0x20000c02 = 0);
    NONFAILING(*(uint8_t*)0x20000c03 = 0);
    NONFAILING(*(uint8_t*)0x20000c04 = 0);
    NONFAILING(*(uint8_t*)0x20000c05 = 0);
    NONFAILING(*(uint8_t*)0x20000c06 = 0);
    NONFAILING(*(uint8_t*)0x20000c07 = 0);
    NONFAILING(*(uint8_t*)0x20000c08 = 0);
    NONFAILING(*(uint8_t*)0x20000c09 = 0);
    NONFAILING(*(uint8_t*)0x20000c0a = 0);
    NONFAILING(*(uint8_t*)0x20000c0b = 0);
    NONFAILING(*(uint8_t*)0x20000c0c = 0);
    NONFAILING(*(uint8_t*)0x20000c0d = 0);
    NONFAILING(*(uint8_t*)0x20000c0e = 0);
    NONFAILING(*(uint8_t*)0x20000c0f = 0);
    NONFAILING(*(uint8_t*)0x20000c10 = 0);
    NONFAILING(*(uint8_t*)0x20000c11 = 0);
    NONFAILING(*(uint8_t*)0x20000c12 = 0);
    NONFAILING(*(uint8_t*)0x20000c13 = 0);
    NONFAILING(*(uint8_t*)0x20000c14 = 0);
    NONFAILING(*(uint8_t*)0x20000c15 = 0);
    NONFAILING(*(uint8_t*)0x20000c16 = 0);
    NONFAILING(*(uint8_t*)0x20000c17 = 0);
    NONFAILING(*(uint8_t*)0x20000c18 = 0);
    NONFAILING(*(uint8_t*)0x20000c19 = 0);
    NONFAILING(*(uint8_t*)0x20000c1a = 0);
    NONFAILING(*(uint8_t*)0x20000c1b = 0);
    NONFAILING(*(uint8_t*)0x20000c1c = 0);
    NONFAILING(*(uint8_t*)0x20000c1d = 0);
    NONFAILING(*(uint8_t*)0x20000c1e = 0);
    NONFAILING(*(uint8_t*)0x20000c1f = 0);
    NONFAILING(*(uint8_t*)0x20000c20 = 0);
    NONFAILING(*(uint8_t*)0x20000c21 = 0);
    NONFAILING(*(uint8_t*)0x20000c22 = 0);
    NONFAILING(*(uint8_t*)0x20000c23 = 0);
    NONFAILING(*(uint8_t*)0x20000c24 = 0);
    NONFAILING(*(uint8_t*)0x20000c25 = 0);
    NONFAILING(*(uint8_t*)0x20000c26 = 0);
    NONFAILING(*(uint8_t*)0x20000c27 = 0);
    NONFAILING(*(uint8_t*)0x20000c28 = 0);
    NONFAILING(*(uint8_t*)0x20000c29 = 0);
    NONFAILING(*(uint8_t*)0x20000c2a = 0);
    syscall(__NR_ioctl, r[1], 0x40a85321, 0x20000b80);
    break;
  case 17:
    syscall(__NR_ioctl, r[1], 0x80045301, 0x20000340);
    break;
  case 18:
    NONFAILING(memcpy((void*)0x20000040, "/dev/sequencer2", 16));
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0, 0);
    if (res != -1)
      r[4] = res;
    break;
  case 19:
    NONFAILING(memcpy((void*)0x200006c0, "/dev/sequencer2", 16));
    syscall(__NR_openat, 0xffffffffffffff9c, 0x200006c0, 0x222081, 0);
    break;
  case 20:
    NONFAILING(*(uint64_t*)0x20000100 = 0x20000680);
    NONFAILING(*(uint64_t*)0x20000680 = 0x20000640);
    NONFAILING(*(uint64_t*)0x20000640 = 0);
    NONFAILING(*(uint64_t*)0x20000648 = 0);
    syscall(__NR_ioctl, -1, 0x40085203, 0x20000100);
    break;
  case 21:
    NONFAILING(*(uint16_t*)0x20000140 = 5);
    NONFAILING(*(uint16_t*)0x20000142 = 1);
    NONFAILING(*(uint16_t*)0x20000144 = 0);
    NONFAILING(*(uint32_t*)0x20000148 = 8);
    NONFAILING(*(uint32_t*)0x2000014c = 0);
    NONFAILING(*(uint32_t*)0x20000150 = 7);
    NONFAILING(*(uint32_t*)0x20000154 = 0x401);
    NONFAILING(*(uint32_t*)0x20000158 = 0x1f);
    NONFAILING(*(uint32_t*)0x2000015c = r[3]);
    syscall(__NR_setsockopt, r[4], 0x84, 0xa, 0x20000140, 0x20);
    break;
  }
}

void execute_one()
{
  execute(22);
  collide = 1;
  execute(22);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        if (chdir(cwd))
          fail("failed to chdir");
        use_temporary_dir();
        int pid = do_sandbox_namespace();
        int status = 0;
        while (waitpid(pid, &status, __WALL) != pid) {
        }
      }
    }
  }
  sleep(1000000);
  return 0;
}