// https://syzkaller.appspot.com/bug?id=d84a94e93317c622d65ba62c572dc12898272fd1
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.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 <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/mount.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/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <sys/wait.h>
#include <time.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 <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 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 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);
}

#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);
  va_end(args);
  rv = system(command);
  if (rv) {
    if (panic)
      fail("command '%s' failed: %d", &command[0], rv);
  }
}

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 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);
}

static void initialize_netdevices(void)
{
  unsigned i;
  const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"};
  const char* devnames[] = {"lo",
                            "sit0",
                            "bridge0",
                            "vcan0",
                            "tunl0",
                            "gre0",
                            "gretap0",
                            "ip_vti0",
                            "ip6_vti0",
                            "ip6tnl0",
                            "ip6gre0",
                            "ip6gretap0",
                            "erspan0",
                            "bond0",
                            "veth0",
                            "veth1",
                            "team0",
                            "veth0_to_bridge",
                            "veth1_to_bridge",
                            "veth0_to_bond",
                            "veth1_to_bond",
                            "veth0_to_team",
                            "veth1_to_team"};
  const char* devmasters[] = {"bridge", "bond", "team"};

  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 type veth");

  for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
    execute_command(
        0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(
        0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s",
        devmasters[i], devmasters[i]);
    execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i],
                    devmasters[i]);
    execute_command(0, "ip link set veth0_to_%s up", devmasters[i]);
    execute_command(0, "ip link set veth1_to_%s up", devmasters[i]);
  }
  execute_command(0, "ip link set bridge_slave_0 up");
  execute_command(0, "ip link set bridge_slave_1 up");

  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 int read_tun(char* data, int size)
{
  if (tunfd < 0)
    return -1;

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

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

static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1)
{

  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == (uintptr_t)-1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

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 setup_cgroups()
{
  if (mkdir("/syzcgroup", 0777)) {
  }
  if (mkdir("/syzcgroup/unified", 0777)) {
  }
  if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) {
  }
  if (chmod("/syzcgroup/unified", 0777)) {
  }
  if (!write_file("/syzcgroup/unified/cgroup.subtree_control",
                  "+cpu +memory +io +pids +rdma")) {
  }
  if (mkdir("/syzcgroup/cpu", 0777)) {
  }
  if (mount("none", "/syzcgroup/cpu", "cgroup", 0,
            "cpuset,cpuacct,perf_event,hugetlb")) {
  }
  if (!write_file("/syzcgroup/cpu/cgroup.clone_children", "1")) {
  }
  if (chmod("/syzcgroup/cpu", 0777)) {
  }
  if (mkdir("/syzcgroup/net", 0777)) {
  }
  if (mount("none", "/syzcgroup/net", "cgroup", 0,
            "net_cls,net_prio,devices,freezer")) {
  }
  if (chmod("/syzcgroup/net", 0777)) {
  }
}

static void setup_binfmt_misc()
{
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz0:M:0:syz0::./file0:")) {
  }
  if (!write_file("/proc/sys/fs/binfmt_misc/register",
                  ":syz1:M:1:yz1::./file0:POC")) {
  }
}

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 = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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/newroot/syzcgroup", 0700))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/syzcgroup/unified", 0700))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/syzcgroup/cpu", 0700))
    fail("mkdir failed");
  if (mkdir("./syz-tmp/newroot/syzcgroup/net", 0700))
    fail("mkdir failed");
  if (mount("/syzcgroup/unified", "./syz-tmp/newroot/syzcgroup/unified", NULL,
            mount_flags, NULL)) {
  }
  if (mount("/syzcgroup/cpu", "./syz-tmp/newroot/syzcgroup/cpu", NULL,
            mount_flags, NULL)) {
  }
  if (mount("/syzcgroup/net", "./syz-tmp/newroot/syzcgroup/net", NULL,
            mount_flags, NULL)) {
  }
  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;

  setup_cgroups();
  setup_binfmt_misc();
  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 void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exitf("opendir(%s) failed due to NOFILE, exiting", dir);
    }
    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 void execute_one();
extern unsigned long long procid;

static void loop()
{
  char cgroupdir[64];
  snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
  char cgroupdir_cpu[64];
  snprintf(cgroupdir_cpu, sizeof(cgroupdir_cpu), "/syzcgroup/cpu/syz%llu",
           procid);
  char cgroupdir_net[64];
  snprintf(cgroupdir_net, sizeof(cgroupdir_net), "/syzcgroup/net/syz%llu",
           procid);
  if (mkdir(cgroupdir, 0777)) {
  }
  if (mkdir(cgroupdir_cpu, 0777)) {
  }
  if (mkdir(cgroupdir_net, 0777)) {
  }
  int pid = getpid();
  char procs_file[128];
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir);
  if (!write_file(procs_file, "%d", pid)) {
  }
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_cpu);
  if (!write_file(procs_file, "%d", pid)) {
  }
  snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_net);
  if (!write_file(procs_file, "%d", pid)) {
  }
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    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");
      if (symlink(cgroupdir, "./cgroup")) {
      }
      if (symlink(cgroupdir_cpu, "./cgroup.cpu")) {
      }
      if (symlink(cgroupdir_net, "./cgroup.net")) {
      }
      flush_tun();
      execute_one();
      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 < 3 * 1000)
        continue;
      kill(-pid, SIGKILL);
      kill(pid, SIGKILL);
      while (waitpid(-1, &status, __WALL) != pid) {
      }
      break;
    }
    remove_dir(cwdbuf);
  }
}

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 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);
        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[1] = {0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_mlockall, 2);
    break;
  case 1:
    syscall(__NR_clone, 0, 0x20b53000, 0x2084effc, 0x20c35ffc, 0x20b3bfff);
    break;
  case 2:
    syscall(__NR_ioctl, -1, 0x4b70, 0x20000240);
    break;
  case 3:
    syscall(__NR_ioctl, -1, 0x541b, 0x20000280);
    break;
  case 4:
    syscall(__NR_socket, 0x10, 3, 0);
    break;
  case 5:
    memcpy((void*)0x20000580, "/dev/full", 10);
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20000580, 0x400000, 0);
    break;
  case 6:
    *(uint32_t*)0x20000980 = 7;
    *(uint32_t*)0x20000984 = 0;
    *(uint32_t*)0x20000988 = 0x1ff;
    *(uint32_t*)0x2000098c = 0x1d1a;
    *(uint32_t*)0x20000990 = 0;
    *(uint32_t*)0x20000994 = 7;
    *(uint8_t*)0x20000998 = 0;
    *(uint8_t*)0x20000999 = 0;
    *(uint8_t*)0x2000099a = 0;
    *(uint8_t*)0x2000099b = 0;
    *(uint8_t*)0x2000099c = 0;
    *(uint8_t*)0x2000099d = 0;
    *(uint8_t*)0x2000099e = 0;
    *(uint8_t*)0x2000099f = 0;
    *(uint8_t*)0x200009a0 = 0;
    *(uint8_t*)0x200009a1 = 0;
    *(uint8_t*)0x200009a2 = 0;
    *(uint8_t*)0x200009a3 = 0;
    *(uint8_t*)0x200009a4 = 0;
    *(uint8_t*)0x200009a5 = 0;
    *(uint8_t*)0x200009a6 = 0;
    *(uint8_t*)0x200009a7 = 0;
    *(uint8_t*)0x200009a8 = 0;
    *(uint8_t*)0x200009a9 = 0;
    *(uint8_t*)0x200009aa = 0;
    *(uint8_t*)0x200009ab = 0;
    *(uint8_t*)0x200009ac = 0;
    *(uint8_t*)0x200009ad = 0;
    *(uint8_t*)0x200009ae = 0;
    *(uint8_t*)0x200009af = 0;
    *(uint8_t*)0x200009b0 = 0;
    *(uint8_t*)0x200009b1 = 0;
    *(uint8_t*)0x200009b2 = 0;
    *(uint8_t*)0x200009b3 = 0;
    *(uint8_t*)0x200009b4 = 0;
    *(uint8_t*)0x200009b5 = 0;
    *(uint8_t*)0x200009b6 = 0;
    *(uint8_t*)0x200009b7 = 0;
    *(uint8_t*)0x200009b8 = 0;
    *(uint8_t*)0x200009b9 = 0;
    *(uint8_t*)0x200009ba = 0;
    *(uint8_t*)0x200009bb = 0;
    *(uint8_t*)0x200009bc = 0;
    *(uint8_t*)0x200009bd = 0;
    *(uint8_t*)0x200009be = 0;
    *(uint8_t*)0x200009bf = 0;
    *(uint8_t*)0x200009c0 = 0;
    *(uint8_t*)0x200009c1 = 0;
    *(uint8_t*)0x200009c2 = 0;
    *(uint8_t*)0x200009c3 = 0;
    *(uint8_t*)0x200009c4 = 0;
    *(uint8_t*)0x200009c5 = 0;
    *(uint8_t*)0x200009c6 = 0;
    *(uint8_t*)0x200009c7 = 0;
    *(uint8_t*)0x200009c8 = 0;
    *(uint8_t*)0x200009c9 = 0;
    *(uint8_t*)0x200009ca = 0;
    *(uint8_t*)0x200009cb = 0;
    *(uint8_t*)0x200009cc = 0;
    *(uint8_t*)0x200009cd = 0;
    *(uint8_t*)0x200009ce = 0;
    *(uint8_t*)0x200009cf = 0;
    *(uint8_t*)0x200009d0 = 0;
    *(uint8_t*)0x200009d1 = 0;
    *(uint8_t*)0x200009d2 = 0;
    *(uint8_t*)0x200009d3 = 0;
    *(uint8_t*)0x200009d4 = 0;
    *(uint8_t*)0x200009d5 = 0;
    *(uint8_t*)0x200009d6 = 0;
    *(uint8_t*)0x200009d7 = 0;
    syscall(__NR_ioctl, -1, 0xc058534b, 0x20000980);
    break;
  case 7:
    memcpy((void*)0x20000240,
           "\x2f\x65\x78\x65\x00\x00\x00\x00\x00\x04\x09\x00\x4b\xdd\xd9\xde"
           "\x91\xbe\x10\xee\xbf\x00\x0e\xe9\xa9\x0f\x79\x80\x58\x43\x9e\xd5"
           "\x54\xfa\x07\x42\x4a\xde\xe9\x01\xd2\xda\x75\xaf\x1f\x02\x00\xf5"
           "\xab\x26\xd7\xa0\x71\xfb\x35\x33\x1c\xe3\x9c\x5a",
           60);
    syz_open_procfs(0, 0x20000240);
    break;
  case 8:
    memcpy(
        (void*)0x200002c0,
        "\x08\x01\x05\x0f\xc2\x00\x00\x00\xb9\x00\x00\x00\xb8\x42\x00\x00\xe3"
        "\x00\x00\x00\x00\x00\x00\x7e\x29\x11\x76\x9a\xf4\xd7\x77\xae\x78\x55"
        "\x29\x69\xad\x64\xbf\x7c\x41\x96\x1c\xe4\xb5\x78\x0b\x5a\x02\x96\x13"
        "\x66\x46\x3d\xad\xf7\x04\x80\x0d\xd1\xe7\x34\x55\x43\xd3\x21\xf6\x42"
        "\x0d\xc9\x31\x30\x9e\x22\xa1\xcb\x7d\x24\x80\x9e\x9e\xfc\x82\xa2\x79"
        "\x52\xa6\x84\x6c\x86\x03\x15\x8c\xc8\xe1\x0d\x32\x1e\xa7\x2d\xf4\x79"
        "\x17\x39\xd4\xb8\x69\x02\x6d\xa1\x27\x57\x65\xff\xa0\x55\xfc\x8c\xc6"
        "\x92\x8f\xa9\x58\x16\x4f\x59\xbf\x91\x74\xb2\x8b\x8e\x6a\xec\xb3\x70"
        "\xbb\x74\xe1\xfc\x2b\xac\x13\x6a\xb6\x72\x7b\xd2\xcb\x7d\x91\xed\x7f"
        "\x35\x46\xd1\xa7\x75\x99\x73\x66\x53\x4d\x19\x3f\xa2\x01\x7d\xa0\x6a"
        "\x1d\x63\x58\x2d\x35\x08\xc3\x8a\x40\xef\xce\xab\xea\xf6\xa4\xc7\x4a"
        "\x27\xad\xd6\xb2\x63\x4c\xa7\xda\x32\x87\xbd\x69\x3e\x51\x42\x42\xab"
        "\x27\x94\x17\x8a\x69\x07\x61\xee\xa7\x24\xc3\x46\x70\x70\xb5\xd5\x61"
        "\xd0\x65\x87\xff\x24\xa9\x77\x6b\x89\x92\xbd\x2d\x8f\x9e\x77\x10\x38"
        "\xd7\x75\x3a\xb7\xbc\x89\x45\x5b\x9a\x49\x44\xc1\xb6\xc9\xb5\xeb\xa8"
        "\x9c\x51\x29\x35\xb9\x52\xe6\x48\x83\x5c\x64\x67\xd7\x26\x6a\xc8\x9b"
        "\x02\x34\x6b\x60\xff\xeb\x4e\x80\x84\x01\xdd\x05\x00\x00\xc7\x11\xb9"
        "\x3e\xda\xb7\x66\x14\x68\xb8\x68\x26\xb3\x17\x48\xcc\xe9\xb5\x97\x87"
        "\xbb\x44\x6d\xc4\x9f\x64\x24\xc3\xff\x36\xd6\xcf\x0a\x85\x27\x9b\x1c"
        "\x01\x47\x2d\xa7\x6c\x6f\x9b\x34\xf6\x90\xb7\xd7\xe8\x9b\x5a\x19\x53"
        "\x09\x0c\x08\xd0\x27\xe5\xef\x62\x73\xa0\x72\x16\x1a\x08\x96\x5d\x6a"
        "\x7c\x78\xd0\x86\xd7\xdb\x03\x3b\x05\x67\x6b\x7c\x5b\x30\x5d\xbf\x72"
        "\x66\x13\x43\xa5\xce\xf7\xbc\x05\x90\xe4\x7f\xfe\x97\xb2\x7b\x17\xd7"
        "\xee\x5d\x6c\x02\xce\xa8\xc6\x3f\x97\xac\x14\x55\x81\xa1\xb4\xfc\x4a"
        "\x44\xcd\xc5\x32\x0e\x5f\x1a\x32\x38\xbd\xdc\x99\x84\xd8\x6a\xa2\xe3"
        "\xfb\xd4\xb1\xc4\x2c\x5b\x7e\xf3\x2d\xae\x0b\x1b\x56\xfa\xe5\x4c\x33"
        "\x44\x5b\x3b\xbb\x0e\xcb\x48\xc3\xd6\xe9\xf4\x50\x3f\x06\x51\x40\x05"
        "\xfd\x4f\xad\xdd\x6f\xf1\xa9\xde\x5c\xff\xed\xa6\x17\x07\x71\x67\x2d"
        "\x8a\x24\x39\x96\x55\xef\xb1\x7e\xd4\xc3\x21\xea\xfd\x34\x3d\x65\x9b"
        "\x87\xd5\x60\xdd\x55\x7c\x69\x3d\x85\x85\x7f\xa9\x2a\x02\xb4\x53\x7d"
        "\x39\xab\xd6\x1f\x40\xaf\x91\xa0\x52\xd1\x52\x5b\x8a\x50\x08\x7b\x61"
        "\xc5\x6e\x6e\xc8\xa1\xcc\x73\x2a\xa4\xc1\x78\xe1\x77\x67\xda\xdc\xa6"
        "\x84\xdc\xee\x6a\xd0\x69\xe8\x57\x80\xfa\x8e\x36\x33\xcb\x01\x15\x3a"
        "\x88\x21\x83\x59\xc0\xca\x44\x75\x95\xf5\xd6\x92\x9f\x83\xa2\x47\x49"
        "\x7e\xc7\xc7\xf6\xd6\xa4\x9e\x06\xe9\x5f\x60\x96\x9e\x31\x2b\xda\xbf"
        "\xc0\x29\xd2\xcf\xf6\xb2\xb4\x62\x53\x55\xcf\x00\x96\x66\xd3\xa4\xcb"
        "\x26\x2c\x42\x1d\x98\x9d\x87\x8f\xe2\x40\xe7\xb4\x34\x05\xa8\x89\x19"
        "\x5b\x1c\xfc\x34\x5f\x66\xc6\x72\x93\x05\x09\x37\xc9\x99\x35\x90\x90"
        "\x8f\x98\x73\x70\xda\xd3\xc6\x8d\x30\x44\x6a\x46\x49\x0f\xc0\x17\x92"
        "\xf4\x2b\xa8\x29\x68\xf9\x1e\x34\xa7\x5e\x7e\x3c\x26\x50\xdf\x60\xe8"
        "\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        689);
    syscall(__NR_write, -1, 0x200002c0, 0x2b1);
    break;
  case 9:
    memcpy((void*)0x20000640,
           "\x8b\x43\x9a\x9f\xea\x1e\x54\x9f\xce\x25\x3b\x70\x0f", 13);
    *(uint64_t*)0x20664fc0 = 0;
    *(uint64_t*)0x20664fc8 = 1;
    *(uint64_t*)0x20664fd0 = 9;
    *(uint64_t*)0x20664fd8 = 0;
    *(uint64_t*)0x20664fe0 = 0x10000000000000;
    *(uint64_t*)0x20664fe8 = 0;
    *(uint64_t*)0x20664ff0 = 0;
    *(uint64_t*)0x20664ff8 = 0;
    syscall(__NR_mq_open, 0x20000640, 0x6e93ebbbcc0884f2, 0, 0x20664fc0);
    break;
  case 10:
    syscall(__NR_mmap, 0x20000000, 0xe7e000, 3, 0x31, -1, 0);
    break;
  case 11:
    syscall(__NR_ustat, 7, 0x20000080);
    break;
  case 12:
    memcpy((void*)0x20000000, "user", 5);
    *(uint8_t*)0x20000040 = 0x73;
    *(uint8_t*)0x20000041 = 0x79;
    *(uint8_t*)0x20000042 = 0x7a;
    *(uint8_t*)0x20000043 = 0x23;
    *(uint8_t*)0x20000044 = 0;
    syscall(__NR_add_key, 0x20000000, 0x20000040, 0x20000080, 0, 0);
    break;
  case 13:
    syscall(__NR_socket, 0xa, 2, 0);
    break;
  case 14:
    res = syscall(__NR_socket, 0x18, 1, 1);
    if (res != -1)
      r[0] = res;
    break;
  case 15:
    *(uint32_t*)0x20000140 = 0;
    *(uint32_t*)0x20000144 = 0xde3;
    *(uint32_t*)0x20000148 = 0x400;
    *(uint32_t*)0x2000014c = 5;
    *(uint32_t*)0x200005c0 = 0x10;
    syscall(__NR_getsockopt, r[0], 0x84, 0, 0x20000140, 0x200005c0);
    break;
  }
}

void execute_one()
{
  execute(16);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  char* cwd = get_current_dir_name();
  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) {
    }
  }
}