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

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <fcntl.h>
#include <linux/capability.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 <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.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/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.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 <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 __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
#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(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 (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 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"

#define IFF_NAPI 0x0010
#define IFF_NAPI_FRAGS 0x0020

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 | 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;

  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 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) {
    close(fd);
    return false;
  }
  close(fd);
  return true;
}

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 (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");
  if (mount("/dev", "./syz-tmp/newroot/dev", NULL,
            MS_BIND | MS_REC | MS_PRIVATE, 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/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(int executor_pid, bool enable_tun)
{
  setup_tun(executor_pid, enable_tun);

  real_uid = getuid();
  real_gid = getgid();
  mprotect(sandbox_stack, 4096, PROT_NONE);
  return clone(
      namespace_sandbox_proc,
      &sandbox_stack[sizeof(sandbox_stack) - 64],
      CLONE_NEWUSER | CLONE_NEWPID | CLONE_NEWUTS | CLONE_NEWNET, NULL);
}

#ifndef __NR_fcntl
#define __NR_fcntl 55
#endif
#ifndef __NR_eventfd
#define __NR_eventfd 323
#endif
#ifndef __NR_accept4
#define __NR_accept4 364
#endif
#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_sched_setaffinity
#define __NR_sched_setaffinity 241
#endif
#ifndef __NR_modify_ldt
#define __NR_modify_ldt 123
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 366
#endif
#ifndef __NR_mmap
#define __NR_mmap 90
#endif
#ifndef __NR_perf_event_open
#define __NR_perf_event_open 336
#endif
#ifndef __NR_getsockopt
#define __NR_getsockopt 365
#endif
#ifndef __NR_ioprio_get
#define __NR_ioprio_get 290
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[104];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    NONFAILING(*(uint32_t*)0x2002ef88 = (uint32_t)0x2);
    NONFAILING(*(uint32_t*)0x2002ef8c = (uint32_t)0x78);
    NONFAILING(*(uint8_t*)0x2002ef90 = (uint8_t)0x43);
    NONFAILING(*(uint8_t*)0x2002ef91 = (uint8_t)0x2);
    NONFAILING(*(uint8_t*)0x2002ef92 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002ef93 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2002ef94 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002ef98 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efa0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efa8 = (uint64_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb1 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb3 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efb4 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efb8 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efbc = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efc0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efc8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efd0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efd8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efe0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efe8 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002eff0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2002eff8 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x2002effc = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x2002effe = (uint16_t)0x0);
    r[28] = syscall(__NR_perf_event_open, 0x2002ef88ul, 0x0ul, 0x0ul,
                    0xfffffffffffffffful, 0x0ul);
    break;
  case 2:
    r[29] = syscall(__NR_eventfd, 0x0ul);
    break;
  case 3:
    NONFAILING(*(uint64_t*)0x20f23ff8 = (uint64_t)0x9);
    r[31] = syscall(__NR_write, r[29], 0x20f23ff8ul, 0x8ul);
    break;
  case 4:
    r[32] = syscall(__NR_socket, 0x2ul, 0x9ul, 0x84ul);
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20a2a000 = (uint32_t)0xe8);
    r[34] = syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x0ul,
                    0x10ul, 0x20406f18ul, 0x20a2a000ul);
    break;
  case 6:
    r[35] = syscall(__NR_fcntl, r[28], 0x10ul, 0x206f0000ul);
    if (r[35] != -1)
      NONFAILING(r[36] = *(uint32_t*)0x206f0004);
    break;
  case 7:
    r[37] = syscall(__NR_ioprio_get, 0x1ul, r[36]);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x2002ef88 = (uint32_t)0x2);
    NONFAILING(*(uint32_t*)0x2002ef8c = (uint32_t)0x78);
    NONFAILING(*(uint8_t*)0x2002ef90 = (uint8_t)0x3f);
    NONFAILING(*(uint8_t*)0x2002ef91 = (uint8_t)0x2);
    NONFAILING(*(uint8_t*)0x2002ef92 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002ef93 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2002ef94 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002ef98 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efa0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efa8 = (uint64_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb0 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb1 = (uint8_t)0x2);
    NONFAILING(*(uint8_t*)0x2002efb2 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x2002efb3 = (uint8_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efb4 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efb8 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efbc = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efc0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efc8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efd0 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efd8 = (uint64_t)0x0);
    NONFAILING(*(uint64_t*)0x2002efe0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2002efe8 = (uint32_t)0x0);
    NONFAILING(*(uint64_t*)0x2002eff0 = (uint64_t)0x0);
    NONFAILING(*(uint32_t*)0x2002eff8 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x2002effc = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x2002effe = (uint16_t)0x0);
    r[65] = syscall(__NR_perf_event_open, 0x2002ef88ul, 0x0ul, 0x0ul,
                    r[28], 0x0ul);
    break;
  case 9:
    NONFAILING(*(uint64_t*)0x209abff8 = (uint64_t)0x5b);
    r[67] = syscall(__NR_sched_setaffinity, r[36], 0x8ul, 0x209abff8ul);
    break;
  case 10:
    r[68] = syscall(__NR_modify_ldt, 0x0ul, 0x20f43f24ul, 0x0ul);
    break;
  case 11:
    NONFAILING(*(uint32_t*)0x204f2ffc = (uint32_t)0x1c);
    r[70] = syscall(__NR_accept4, 0xffffffffffffff9cul, 0x202cb000ul,
                    0x204f2ffcul, 0x0ul);
    break;
  case 12:
    NONFAILING(*(uint16_t*)0x20c1fff8 = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x20c1fffa = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x20c1fffc = (uint16_t)0x1);
    NONFAILING(*(uint16_t*)0x20c1fffe = (uint16_t)0x9);
    r[75] = syscall(__NR_setsockopt, 0xfffffffffffffffful, 0x84ul,
                    0x2ul, 0x20c1fff8ul, 0x8ul);
    break;
  case 13:
    NONFAILING(memcpy(
        (void*)0x200d1ff3,
        "\x2f\x64\x65\x76\x2f\x6e\x65\x74\x2f\x74\x75\x6e\x00", 13));
    r[77] = syz_open_dev(0x200d1ff3ul, 0x0ul, 0x0ul);
    break;
  case 14:
    NONFAILING(*(uint32_t*)0x20d7bffc = (uint32_t)0x4);
    r[79] = syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x84ul,
                    0x1cul, 0x2008f000ul, 0x20d7bffcul);
    break;
  case 15:
    NONFAILING(*(uint32_t*)0x2017a000 = (uint32_t)0x4);
    r[81] = syscall(__NR_getsockopt, 0xfffffffffffffffful, 0x84ul,
                    0x20ul, 0x206a7000ul, 0x2017a000ul);
    break;
  case 16:
    NONFAILING(*(uint32_t*)0x20603ffc = (uint32_t)0x3);
    r[83] = syscall(__NR_setsockopt, 0xfffffffffffffffful, 0x0ul, 0xaul,
                    0x20603ffcul, 0x4ul);
    break;
  case 17:
    NONFAILING(memcpy((void*)0x20533000, "\x02\x00\x00\x00\x04\x00\x00"
                                         "\x00\xf0\x04\x00\x80\x00\xe9"
                                         "\xbc\x22",
                      16));
    NONFAILING(*(uint32_t*)0x20533010 = (uint32_t)0x10001);
    NONFAILING(*(uint32_t*)0x20533014 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20533018 = (uint32_t)0x20cb8000);
    NONFAILING(*(uint32_t*)0x20cb8000 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20cb8004 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20cb8008 = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20cb800c = (uint32_t)0x0);
    NONFAILING(*(uint32_t*)0x20cb8010 = (uint32_t)0x0);
    NONFAILING(*(uint16_t*)0x20cb8014 = (uint16_t)0x0);
    NONFAILING(*(uint16_t*)0x20cb8016 = (uint16_t)0x0);
    r[95] = syscall(__NR_ioctl, r[77], 0x400454caul, 0x20533000ul);
    break;
  case 18:
    NONFAILING(memcpy((void*)0x20533000, "\x2c\x1b\xe9\xe2\x3d\xae\xe3"
                                         "\x19\xab\xa0\xe6\xb2\x99\xff"
                                         "\xec\xa3",
                      16));
    NONFAILING(*(uint64_t*)0x20533010 = (uint64_t)0x5);
    NONFAILING(*(uint64_t*)0x20533018 = (uint64_t)0x2);
    NONFAILING(*(uint16_t*)0x20533020 = (uint16_t)0x0);
    NONFAILING(*(uint8_t*)0x20533022 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20533023 = (uint8_t)0x0);
    NONFAILING(*(uint8_t*)0x20533024 = (uint8_t)0x0);
    r[103] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0x400454caul,
                     0x20533000ul);
    break;
  }
  return 0;
}

void loop()
{
  long i;
  pthread_t th[38];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 19; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 19; i++) {
    pthread_create(&th[19 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  install_segv_handler();
  use_temporary_dir();
  int pid = do_sandbox_namespace(0, true);
  int status = 0;
  while (waitpid(pid, &status, __WALL) != pid) {
  }
  return 0;
}