// https://syzkaller.appspot.com/bug?id=d4463a2d3563cdc5823b22d4e115144d0af7e88c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

static unsigned long long procid;

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

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 kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 5000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  socket$nl_netfilter arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0xc (4 bytes)
  //  ]
  //  returns sock_nl_netfilter
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0xc);
  if (res != -1)
    r[0] = res;
  //  sendmsg$NFT_BATCH arguments: [
  //    fd: sock_nl_netfilter (resource)
  //    msg: ptr[in, msghdr_netlink[nft_batch_msg]] {
  //      msghdr_netlink[nft_batch_msg] {
  //        addr: nil
  //        addrlen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        vec: ptr[in, iovec[in, nft_batch_msg]] {
  //          iovec[in, nft_batch_msg] {
  //            addr: ptr[in, nft_batch_msg] {
  //              nft_batch_msg {
  //                begin: nft_nlmsghdr[NFNL_MSG_BATCH_BEGIN] {
  //                  nlmsg_len: len = 0x14 (4 bytes)
  //                  nlmsg_type: const = 0x10 (2 bytes)
  //                  nlmsg_flags: const = 0x1 (2 bytes)
  //                  nlmsg_seq: const = 0x0 (4 bytes)
  //                  nlmsg_pid: const = 0x0 (4 bytes)
  //                  hdr: nfgenmsg_nft {
  //                    nfgen_family: families = 0x2 (1 bytes)
  //                    version: const = 0x0 (1 bytes)
  //                    res_id: const = 0xa (2 bytes)
  //                  }
  //                }
  //                msgs: array[nft_batch_message] {
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWTABLE:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWTABLE, array[nft_table_policy]] {
  //                      len: len = 0x20 (4 bytes)
  //                      type: const = 0x0 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x401 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0xa (2 bytes)
  //                      }
  //                      attrs: array[nft_table_policy] {
  //                        union nft_table_policy {
  //                          NFTA_TABLE_NAME: nlattr_t[const[NFTA_TABLE_NAME,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWCHAIN:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWCHAIN, array[nft_chain_policy]] {
  //                      len: len = 0x40 (4 bytes)
  //                      type: const = 0x3 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x401 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0xa (2 bytes)
  //                      }
  //                      attrs: array[nft_chain_policy] {
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_TABLE: nlattr_t[const[NFTA_CHAIN_TABLE,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_NAME: nlattr_t[const[NFTA_CHAIN_NAME,
  //                          int16], string[nft_chain_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x3 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_chain_policy {
  //                          NFTA_CHAIN_HOOK: nlattr_tt[const[NFTA_CHAIN_HOOK,
  //                          int16:14], 0, 1, array[nft_hook_policy]] {
  //                            nla_len: offsetof = 0x14 (2 bytes)
  //                            nla_type: const = 0x4 (1 bytes)
  //                            NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                            NLA_F_NESTED: const = 0x1 (1 bytes)
  //                            payload: array[nft_hook_policy] {
  //                              union nft_hook_policy {
  //                                NFTA_HOOK_HOOKNUM:
  //                                nlattr_tt[const[NFTA_HOOK_HOOKNUM,
  //                                int16:14], 1, 0, flags[nf_inet_hooks,
  //                                int32be]] {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x1 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: nf_inet_hooks = 0x3 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                              union nft_hook_policy {
  //                                NFTA_HOOK_PRIORITY:
  //                                nlattr_tt[const[NFTA_HOOK_PRIORITY,
  //                                int16:14], 1, 0,
  //                                int32be[NF_IP_PRI_CONNTRACK:NF_IP_PRI_LAST]]
  //                                {
  //                                  nla_len: offsetof = 0x8 (2 bytes)
  //                                  nla_type: const = 0x2 (1 bytes)
  //                                  NLA_F_NET_BYTEORDER: const = 0x1 (0 bytes)
  //                                  NLA_F_NESTED: const = 0x0 (1 bytes)
  //                                  payload: int32be = 0x0 (4 bytes)
  //                                  size: buffer: {} (length 0x0)
  //                                }
  //                              }
  //                            }
  //                            size: buffer: {} (length 0x0)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                  union nft_batch_message {
  //                    NFT_MSG_NEWRULE:
  //                    netlink_msg_netfilter_tt[NFNL_SUBSYS_NFTABLES,
  //                    NFT_MSG_NEWRULE, array[nft_rule_policy]] {
  //                      len: len = 0x4c (4 bytes)
  //                      type: const = 0x6 (1 bytes)
  //                      subsys: const = 0xa (1 bytes)
  //                      flags: netlink_netfilter_msg_flags = 0x401 (2 bytes)
  //                      seq: const = 0x0 (4 bytes)
  //                      pid: const = 0x0 (4 bytes)
  //                      hdr: nfgenmsg {
  //                        nfgen_family: nfproto = 0x2 (1 bytes)
  //                        version: const = 0x0 (1 bytes)
  //                        res_id: int16be = 0xa (2 bytes)
  //                      }
  //                      attrs: array[nft_rule_policy] {
  //                        union nft_rule_policy {
  //                          NFTA_RULE_TABLE: nlattr_t[const[NFTA_RULE_TABLE,
  //                          int16], string[nft_table_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x1 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_rule_policy {
  //                          NFTA_RULE_CHAIN: nlattr_t[const[NFTA_RULE_CHAIN,
  //                          int16], string[nft_chain_name]] {
  //                            nla_len: offsetof = 0x9 (2 bytes)
  //                            nla_type: const = 0x2 (2 bytes)
  //                            payload: buffer: {73 79 7a 30 00} (length 0x5)
  //                            size: buffer: {} (length 0x0)
  //                            pad = 0x0 (3 bytes)
  //                          }
  //                        }
  //                        union nft_rule_policy {
  //                          NFTA_RULE_EXPRESSIONS:
  //                          nlattr_tt[const[NFTA_RULE_EXPRESSIONS, int16:14],
  //                          0, 1, array[nlnest[NFTA_LIST_ELEM,
  //                          nft_expr_policy]]] {
  //                            nla_len: offsetof = 0x20 (2 bytes)
  //                            nla_type: const = 0x4 (1 bytes)
  //                            NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                            NLA_F_NESTED: const = 0x1 (1 bytes)
  //                            payload: array[nlattr_tt[const[NFTA_LIST_ELEM,
  //                            int16:14], 0, 1, nft_expr_policy]] {
  //                              nlattr_tt[const[NFTA_LIST_ELEM, int16:14], 0,
  //                              1, nft_expr_policy] {
  //                                nla_len: offsetof = 0x1c (2 bytes)
  //                                nla_type: const = 0x1 (1 bytes)
  //                                NLA_F_NET_BYTEORDER: const = 0x0 (0 bytes)
  //                                NLA_F_NESTED: const = 0x1 (1 bytes)
  //                                payload: union nft_expr_policy {
  //                                  queue: nft_expr_policy_t["queue",
  //                                  nft_queue_policy] {
  //                                    NFTA_EXPR_NAME:
  //                                    nlattr_t[const[NFTA_EXPR_NAME, int16],
  //                                    string["queue"]] {
  //                                      nla_len: offsetof = 0xa (2 bytes)
  //                                      nla_type: const = 0x1 (2 bytes)
  //                                      payload: buffer: {71 75 65 75 65 00}
  //                                      (length 0x6) size: buffer: {} (length
  //                                      0x0) pad = 0x0 (2 bytes)
  //                                    }
  //                                    NFTA_EXPR_DATA: union
  //                                    optional[nlnest[NFTA_EXPR_DATA,
  //                                    array[nft_queue_policy]]] {
  //                                      val: nlattr_tt[const[NFTA_EXPR_DATA,
  //                                      int16:14], 0, 1,
  //                                      array[nft_queue_policy]] {
  //                                        nla_len: offsetof = 0xc (2 bytes)
  //                                        nla_type: const = 0x2 (1 bytes)
  //                                        NLA_F_NET_BYTEORDER: const = 0x0 (0
  //                                        bytes) NLA_F_NESTED: const = 0x1 (1
  //                                        bytes) payload:
  //                                        array[nft_queue_policy] {
  //                                          union nft_queue_policy {
  //                                            NFTA_QUEUE_NUM:
  //                                            nlattr_tt[const[NFTA_QUEUE_NUM,
  //                                            int16:14], 1, 0, int16be] {
  //                                              nla_len: offsetof = 0x6 (2
  //                                              bytes) nla_type: const = 0x1
  //                                              (1 bytes) NLA_F_NET_BYTEORDER:
  //                                              const = 0x1 (0 bytes)
  //                                              NLA_F_NESTED: const = 0x0 (1
  //                                              bytes) payload: int16be = 0x0
  //                                              (2 bytes) size: buffer: {}
  //                                              (length 0x0) pad = 0x0 (2
  //                                              bytes)
  //                                            }
  //                                          }
  //                                        }
  //                                        size: buffer: {} (length 0x0)
  //                                      }
  //                                    }
  //                                  }
  //                                }
  //                                size: buffer: {} (length 0x0)
  //                              }
  //                            }
  //                            size: buffer: {} (length 0x0)
  //                          }
  //                        }
  //                      }
  //                    }
  //                  }
  //                }
  //                end: nft_nlmsghdr[NFNL_MSG_BATCH_END] {
  //                  nlmsg_len: len = 0x14 (4 bytes)
  //                  nlmsg_type: const = 0x11 (2 bytes)
  //                  nlmsg_flags: const = 0x1 (2 bytes)
  //                  nlmsg_seq: const = 0x0 (4 bytes)
  //                  nlmsg_pid: const = 0x0 (4 bytes)
  //                  hdr: nfgenmsg_nft {
  //                    nfgen_family: families = 0x2 (1 bytes)
  //                    version: const = 0x0 (1 bytes)
  //                    res_id: const = 0xa (2 bytes)
  //                  }
  //                }
  //              }
  //            }
  //            len: len = 0xd4 (8 bytes)
  //          }
  //        }
  //        vlen: const = 0x1 (8 bytes)
  //        ctrl: const = 0x0 (8 bytes)
  //        ctrllen: const = 0x0 (8 bytes)
  //        f: send_flags = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x0 (8 bytes)
  //  ]
  *(uint64_t*)0x200000000000 = 0;
  *(uint32_t*)0x200000000008 = 0;
  *(uint64_t*)0x200000000010 = 0x200000000100;
  *(uint64_t*)0x200000000100 = 0x200000000200;
  *(uint32_t*)0x200000000200 = 0x14;
  *(uint16_t*)0x200000000204 = 0x10;
  *(uint16_t*)0x200000000206 = 1;
  *(uint32_t*)0x200000000208 = 0;
  *(uint32_t*)0x20000000020c = 0;
  *(uint8_t*)0x200000000210 = 2;
  *(uint8_t*)0x200000000211 = 0;
  *(uint16_t*)0x200000000212 = htobe16(0xa);
  *(uint32_t*)0x200000000214 = 0x20;
  *(uint8_t*)0x200000000218 = 0;
  *(uint8_t*)0x200000000219 = 0xa;
  *(uint16_t*)0x20000000021a = 0x401;
  *(uint32_t*)0x20000000021c = 0;
  *(uint32_t*)0x200000000220 = 0;
  *(uint8_t*)0x200000000224 = 2;
  *(uint8_t*)0x200000000225 = 0;
  *(uint16_t*)0x200000000226 = htobe16(0xa);
  *(uint16_t*)0x200000000228 = 9;
  *(uint16_t*)0x20000000022a = 1;
  memcpy((void*)0x20000000022c, "syz0\000", 5);
  *(uint32_t*)0x200000000234 = 0x40;
  *(uint8_t*)0x200000000238 = 3;
  *(uint8_t*)0x200000000239 = 0xa;
  *(uint16_t*)0x20000000023a = 0x401;
  *(uint32_t*)0x20000000023c = 0;
  *(uint32_t*)0x200000000240 = 0;
  *(uint8_t*)0x200000000244 = 2;
  *(uint8_t*)0x200000000245 = 0;
  *(uint16_t*)0x200000000246 = htobe16(0xa);
  *(uint16_t*)0x200000000248 = 9;
  *(uint16_t*)0x20000000024a = 1;
  memcpy((void*)0x20000000024c, "syz0\000", 5);
  *(uint16_t*)0x200000000254 = 9;
  *(uint16_t*)0x200000000256 = 3;
  memcpy((void*)0x200000000258, "syz0\000", 5);
  *(uint16_t*)0x200000000260 = 0x14;
  STORE_BY_BITMASK(uint16_t, , 0x200000000262, 4, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000263, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000263, 1, 7, 1);
  *(uint16_t*)0x200000000264 = 8;
  STORE_BY_BITMASK(uint16_t, , 0x200000000266, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x200000000267, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x200000000267, 0, 7, 1);
  *(uint32_t*)0x200000000268 = htobe32(3);
  *(uint16_t*)0x20000000026c = 8;
  STORE_BY_BITMASK(uint16_t, , 0x20000000026e, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x20000000026f, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x20000000026f, 0, 7, 1);
  *(uint32_t*)0x200000000270 = htobe32(0);
  *(uint32_t*)0x200000000274 = 0x4c;
  *(uint8_t*)0x200000000278 = 6;
  *(uint8_t*)0x200000000279 = 0xa;
  *(uint16_t*)0x20000000027a = 0x401;
  *(uint32_t*)0x20000000027c = 0;
  *(uint32_t*)0x200000000280 = 0;
  *(uint8_t*)0x200000000284 = 2;
  *(uint8_t*)0x200000000285 = 0;
  *(uint16_t*)0x200000000286 = htobe16(0xa);
  *(uint16_t*)0x200000000288 = 9;
  *(uint16_t*)0x20000000028a = 1;
  memcpy((void*)0x20000000028c, "syz0\000", 5);
  *(uint16_t*)0x200000000294 = 9;
  *(uint16_t*)0x200000000296 = 2;
  memcpy((void*)0x200000000298, "syz0\000", 5);
  *(uint16_t*)0x2000000002a0 = 0x20;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a2, 4, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a3, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a3, 1, 7, 1);
  *(uint16_t*)0x2000000002a4 = 0x1c;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a6, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a7, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002a7, 1, 7, 1);
  *(uint16_t*)0x2000000002a8 = 0xa;
  *(uint16_t*)0x2000000002aa = 1;
  memcpy((void*)0x2000000002ac, "queue\000", 6);
  *(uint16_t*)0x2000000002b4 = 0xc;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002b6, 2, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002b7, 0, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002b7, 1, 7, 1);
  *(uint16_t*)0x2000000002b8 = 6;
  STORE_BY_BITMASK(uint16_t, , 0x2000000002ba, 1, 0, 14);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bb, 1, 6, 1);
  STORE_BY_BITMASK(uint16_t, , 0x2000000002bb, 0, 7, 1);
  *(uint16_t*)0x2000000002bc = htobe16(0);
  *(uint32_t*)0x2000000002c0 = 0x14;
  *(uint16_t*)0x2000000002c4 = 0x11;
  *(uint16_t*)0x2000000002c6 = 1;
  *(uint32_t*)0x2000000002c8 = 0;
  *(uint32_t*)0x2000000002cc = 0;
  *(uint8_t*)0x2000000002d0 = 2;
  *(uint8_t*)0x2000000002d1 = 0;
  *(uint16_t*)0x2000000002d2 = htobe16(0xa);
  *(uint64_t*)0x200000000108 = 0xd4;
  *(uint64_t*)0x200000000018 = 1;
  *(uint64_t*)0x200000000020 = 0;
  *(uint64_t*)0x200000000028 = 0;
  *(uint32_t*)0x200000000030 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[0], /*msg=*/0x200000000000ul, /*f=*/0ul);
  //  socket$nl_generic arguments: [
  //    domain: const = 0x10 (8 bytes)
  //    type: const = 0x3 (8 bytes)
  //    proto: const = 0x10 (4 bytes)
  //  ]
  //  returns sock_nl_generic
  res = syscall(__NR_socket, /*domain=*/0x10ul, /*type=*/3ul, /*proto=*/0x10);
  if (res != -1)
    r[1] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {54 00 00 00 27 00 01 00 02 00 00 00 00 00 00 00 06 01 00 00
  //      20 00 01 80 08 00 02 00 74 63 70 00 14 00 01 00 02 00 08 01 00 00 00
  //      00 00 00 00 00 00 00 00 00 20 00 01 80 08 00 02 00 74 63 70 00 14 00
  //      01 00 02 00 08 02 00 00 00 00 00 00 00 00 00 00 00 00} (length 0x54)
  //    }
  //    count: len = 0x54 (8 bytes)
  //  ]
  memcpy((void*)0x200000000100,
         "\x54\x00\x00\x00\x27\x00\x01\x00\x02\x00\x00\x00\x00\x00\x00\x00\x06"
         "\x01\x00\x00\x20\x00\x01\x80\x08\x00\x02\x00\x74\x63\x70\x00\x14\x00"
         "\x01\x00\x02\x00\x08\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
         "\x00\x20\x00\x01\x80\x08\x00\x02\x00\x74\x63\x70\x00\x14\x00\x01\x00"
         "\x02\x00\x08\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         84);
  syscall(__NR_write, /*fd=*/r[1], /*buf=*/0x200000000100ul, /*count=*/0x54ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}