// https://syzkaller.appspot.com/bug?id=8aa97c8f331730c91d216892a45e279362cddc8b
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/genetlink.h>
#include <linux/if_addr.h>
#include <linux/if_link.h>
#include <linux/in6.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

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;
}

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;
}

struct nlmsg {
  char* pos;
  int nesting;
  struct nlattr* nested[8];
  char buf[4096];
};

static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                         const void* data, int size)
{
  memset(nlmsg, 0, sizeof(*nlmsg));
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_type = typ;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
  memcpy(hdr + 1, data, size);
  nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
}

static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                         int size)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_len = sizeof(*attr) + size;
  attr->nla_type = typ;
  if (size > 0)
    memcpy(attr + 1, data, size);
  nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
}

static void netlink_nest(struct nlmsg* nlmsg, int typ)
{
  struct nlattr* attr = (struct nlattr*)nlmsg->pos;
  attr->nla_type = typ;
  nlmsg->pos += sizeof(*attr);
  nlmsg->nested[nlmsg->nesting++] = attr;
}

static void netlink_done(struct nlmsg* nlmsg)
{
  struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
  attr->nla_len = nlmsg->pos - (char*)attr;
}

static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                            int* reply_len, bool dofail)
{
  if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
    exit(1);
  struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
  hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
  struct sockaddr_nl addr;
  memset(&addr, 0, sizeof(addr));
  addr.nl_family = AF_NETLINK;
  ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                     (struct sockaddr*)&addr, sizeof(addr));
  if (n != (ssize_t)hdr->nlmsg_len) {
    if (dofail)
      exit(1);
    return -1;
  }
  n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  if (reply_len)
    *reply_len = 0;
  if (n < 0) {
    if (dofail)
      exit(1);
    return -1;
  }
  if (n < (ssize_t)sizeof(struct nlmsghdr)) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type == NLMSG_DONE)
    return 0;
  if (reply_len && hdr->nlmsg_type == reply_type) {
    *reply_len = n;
    return 0;
  }
  if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  if (hdr->nlmsg_type != NLMSG_ERROR) {
    errno = EINVAL;
    if (dofail)
      exit(1);
    return -1;
  }
  errno = -((struct nlmsgerr*)(hdr + 1))->error;
  return -errno;
}

static int netlink_send(struct nlmsg* nlmsg, int sock)
{
  return netlink_send_ext(nlmsg, sock, 0, NULL, true);
}

static int netlink_query_family_id(struct nlmsg* nlmsg, int sock,
                                   const char* family_name, bool dofail)
{
  struct genlmsghdr genlhdr;
  memset(&genlhdr, 0, sizeof(genlhdr));
  genlhdr.cmd = CTRL_CMD_GETFAMILY;
  netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
  netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name,
               strnlen(family_name, GENL_NAMSIZ - 1) + 1);
  int n = 0;
  int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail);
  if (err < 0) {
    return -1;
  }
  uint16_t id = 0;
  struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                                         NLMSG_ALIGN(sizeof(genlhdr)));
  for (; (char*)attr < nlmsg->buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
      id = *(uint16_t*)(attr + 1);
      break;
    }
  }
  if (!id) {
    errno = EINVAL;
    return -1;
  }
  recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
  return id;
}

static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
                                    const char* name, bool up)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr,
               sizeof(hdr));
  if (name)
    netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
  netlink_nest(nlmsg, IFLA_LINKINFO);
  netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
}

static void netlink_device_change(struct nlmsg* nlmsg, int sock,
                                  const char* name, bool up, const char* master,
                                  const void* mac, int macsize,
                                  const char* new_name)
{
  struct ifinfomsg hdr;
  memset(&hdr, 0, sizeof(hdr));
  if (up)
    hdr.ifi_flags = hdr.ifi_change = IFF_UP;
  hdr.ifi_index = if_nametoindex(name);
  netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
  if (new_name)
    netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
  if (master) {
    int ifindex = if_nametoindex(master);
    netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
  }
  if (macsize)
    netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
  int err = netlink_send(nlmsg, sock);
  if (err < 0) {
  }
}

static struct nlmsg nlmsg;

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");
}

#define NL802154_CMD_SET_SHORT_ADDR 11
#define NL802154_ATTR_IFINDEX 3
#define NL802154_ATTR_SHORT_ADDR 10

static const char* setup_802154()
{
  const char* error = NULL;
  int sock_generic = -1;
  int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
  if (sock_route == -1) {
    error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) failed";
    goto fail;
  }
  sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (sock_generic == -1) {
    error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) failed";
    goto fail;
  }
  {
    int nl802154_family_id =
        netlink_query_family_id(&nlmsg, sock_generic, "nl802154", true);
    if (nl802154_family_id < 0) {
      error = "netlink_query_family_id failed";
      goto fail;
    }
    for (int i = 0; i < 2; i++) {
      char devname[] = "wpan0";
      devname[strlen(devname) - 1] += i;
      uint64_t hwaddr = 0xaaaaaaaaaaaa0002 + (i << 8);
      uint16_t shortaddr = 0xaaa0 + i;
      int ifindex = if_nametoindex(devname);
      struct genlmsghdr genlhdr;
      memset(&genlhdr, 0, sizeof(genlhdr));
      genlhdr.cmd = NL802154_CMD_SET_SHORT_ADDR;
      netlink_init(&nlmsg, nl802154_family_id, 0, &genlhdr, sizeof(genlhdr));
      netlink_attr(&nlmsg, NL802154_ATTR_IFINDEX, &ifindex, sizeof(ifindex));
      netlink_attr(&nlmsg, NL802154_ATTR_SHORT_ADDR, &shortaddr,
                   sizeof(shortaddr));
      if (netlink_send(&nlmsg, sock_generic) < 0) {
        error = "NL802154_CMD_SET_SHORT_ADDR failed";
        goto fail;
      }
      netlink_device_change(&nlmsg, sock_route, devname, true, 0, &hwaddr,
                            sizeof(hwaddr), 0);
      if (i == 0) {
        netlink_add_device_impl(&nlmsg, "lowpan", "lowpan0", false);
        netlink_done(&nlmsg);
        netlink_attr(&nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
        if (netlink_send(&nlmsg, sock_route) < 0) {
          error = "netlink: adding device lowpan0 type lowpan link wpan0";
          goto fail;
        }
      }
    }
  }
fail:
  close(sock_route);
  close(sock_generic);
  return error;
}

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)) {
  }
  *(uint32_t*)0x200000000ac0 = 0;
  *(uint32_t*)0x200000000ac4 = -1;
  *(uint32_t*)0x200000000ac8 = 0;
  *(uint32_t*)0x200000000acc = 7;
  *(uint64_t*)0x200000000ad0 = 0x200000000000;
  memcpy((void*)0x200000000000, "cgroup\000", 7);
  syscall(__NR_bpf, /*cmd=*/0x14ul, /*arg=*/0x200000000ac0ul, /*size=*/0x30ul);
  *(uint32_t*)0x200000000080 = 9;
  *(uint32_t*)0x200000000084 = 4;
  *(uint64_t*)0x200000000088 = 0x200000000280;
  memcpy(
      (void*)0x200000000280,
      "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x61\x12"
      "\x00\x00\x00\x00\x00\x00\x95\x00\x00\x00\x00\x00\x00\x00\x51\xfa\x78\x24"
      "\xc7\x41\x86\xdc\x02\xec\x06\x96\xc3\x7b\x64\xe3\xb2\x4d\xa3\x18\x01\x00"
      "\x00\x00\x05\x34\x5c\x0f\x63\xcd\xc2\xe8\x28\x18\x25\x49\x50\xee\x03\x56"
      "\x8b\x88\x09\xa1\xf0\x4c\x7c\x47\x50\xea\xbf\xaf\xcb\x95\x31\xb3\x1e\x6a"
      "\x86\x82\x7d\x10\x10\xc5\xa9\x09\xab\x98\xe0\x0e\x19\x64\x4a\x88\xe9\x5b"
      "\xa2\x6d\x1c\x9e\xec\xdd\xb2\xd1\x1c\x54\x14\x18\xce\xeb\x29\xb9\xb6\x82"
      "\x9c\x6e\x43\x38\x22\xbd\xb3\xcc\x85\x24\x4a\xab\x66\xc1\xaa\xe9\x31\x4d"
      "\x73\x81\xfc\xfe\xb9\x70\xbe\xa6\x72\x01\x00\x00\x00\x00\x00\x00\x00\x43"
      "\x14\x46\x48\xa0\x7a\x97\x5b\xd8\x9d\xc3\x98\x71\x23\x76\x61\x0f\xaa\x54"
      "\xf1\x24\x95\xb4\x65\x9b\xe8\x67\x30\x86\xf6\xf3\x54\x32\x05\xd4\xbc\x4c"
      "\xe0\x5b\x8b\x96\x11\x03\x67\x3d\xff\x7f\x15\x80\x52\xe6\x2b\xfb\xdc\xdd"
      "\xde\x69\x85\xf3\xf1\xac\x5d\x9a\x94\xcc\x53\x20\x78\x99\x76\x2a\x07\x28"
      "\x2a\x19\x14\x45\x2d\x11\x85\x8e\x79\x5a\x3c\xa3\x0a\x10\x1a\xf5\x57\x4f"
      "\x90\x35\xf2\xb5\xf7\x03\xe5\xbe\x7e\x4a\xcf\x8b\x78\xc2\x83\x4a\xe5\x80"
      "\x5f\xff\xee\x38\xa9\xa0\x03\x3d\x52\x0b\xcf\x6b\x08\xed\xe5\x08\x99\xd4"
      "\xb9\xbd\xf8\x5c\x71\xc5\xed\x44\x03\x9a\xab\x46\x41\x94\x96\x36\x2e\x54"
      "\xcf\xad\x05\xb4\x00\x4a\xc7\x1a\x00\x3d\x7b\x85\xd0\x71\x91\xbe\xd4\xe5"
      "\xa8\x90\x82\x63\x72\x2d\x41\x46\xf7\xed\x56\x99\x85\x43\x9b\xaa\x35\x5c"
      "\xf3\xd8\x73\x1f\x5e\x7a\x23\x7b\xc0\x6d\x03\x5a\x8d\x60\x1f\x21\x74\x6d"
      "\x88\x08\x19\xf3\x8b\x34\xa4\x95\x04\x00\x00\x00\x00\x71\xc2\xf0\xcc\xe8"
      "\xc9\x3c\xc1\x7e\x9a\xfa\x31\x4f\xcb\x2b\xa1\x5d\x64\x6c\x5b\x9f\x87\xd9"
      "\x88\xc9\xfb\xd2\xb9\xd9\xb4\xe2\xd7\x17\x53\xb1\x54\x9f\xa7\x34\xf0\xb2"
      "\xe5\xfc\xf9\x54\x98\x04\xcd\xda\xd7\x21\x97\x16\x37\xf9\xc9\x73\x0a\x9c"
      "\xc3\x84\xee\xd3\x03\x45\x97\x9d\xb9\xc9\x3e\x1c\x52\xf4\x2c\xad\x0a\x4d"
      "\x4f\x94\x36\xd3\xf3\x9b\x0e\xd0\x9c\x39\x5d\xc6\xe9\x70\x36\x60\x87\xa8"
      "\xe4\xda\xee\xb1\xb0\x17\x00\x6f\x25\xca\xf0\xcb\xce\xfd\x13\xd6\x88\x39"
      "\x89\x3e\x39\xc5\x88\xeb\x03\x29\x05\xf9\x1c\xaf\xa4\x99\x6d\xbf\x0c\xc8"
      "\x22\x8d\x02\xa3\x09\x2c\x08\x30\xb8\xf5\x87\xa5\x62\x45\x15\x29\x8b\x2d"
      "\x4e\xb2\xbd\xe6\xf9\xa2\xeb\x83\xd5\x3f\x71\x0c\x49\x0e\xcd\x08\x5d\x28"
      "\x11\xa7\x55\x5c\x53\x03\x00\x00\x00\x7f\x00\x00\x00\x00\xbf\xa6\x47\x8e"
      "\xb9\x6b\x07\x9c\x27\x7e\x29\x10\xb7\xcc\xdc\x3d\x67\x2e\xd3\x4a\xa6\x52"
      "\x78\xc5\x49\xe2\xab\xb5\x49\xad\x95\x48\x84\x28\x91\x30\xbc\x71\xce\xe2"
      "\xb7\xde\x62\xbf\x48\x12\x9a\xe1\xaf\x05\x2a\x2d\x46\xa6\x16\x5e\xb0\x95"
      "\x4d\xac\x72\x65\xf1\xf4\x25\x73\x5a\xcf\x63\x77\x79\x39\x46\xb3\x22\x9e"
      "\x86\x1d\x8e\xa4\x98\x06\xb3\xb5\x33\x34\x5d\x36\xec\xef\x9d\xf7\x00\x00"
      "\x00\x00\xf3\x37\xb1\xce\xb2\xd8\xa6\x5d\xcd\xcd\x89\x5d\x7b\xa3\x70\x98"
      "\xd2\x59\x3f\xda\xae\xf4\x45\xaf\x5b\xee\x02\x01\x9c\x00\x00\x00\xaa\xae"
      "\x37\xf0\x44\xbc\xad\xeb\x0f\x68\x46\x58\x2b\x76\x53\x66\x5a\xa3\x36\xdb"
      "\x9f\x03\x84\xd3\xc7\xdd\xf7\x9c\x2e\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe1\x54\xaa\x0d"
      "\x3e\x41\x98\x6a\x66\x8e\xe1\xe5\xef\x93\xa8\xce\xac\x75\xf4\x4a\xae\x95"
      "\xe2\x67\x42\xf8\x95\xf2\x87\x11\x1f\x8e\xe8\x6f\x7e\x3f\xfb\x63\xcf\xb0"
      "\xe3\x45\xcf\x7f\xc6\x3d\xd2\xb0\xd3\x09\x77\x89\x9c\x6f\x03\x64\x00\x40"
      "\xaf\x4d\xb7\x1f\x74\x52\xbf\xc7\x9a\x05\x11\x8d\x8b\xb4\x2b\x63\xb1\x95"
      "\x77\x1e\x42\xf9\x94\x2e\xc6\x26\xbd\x4b\x54\x61\xb7\x43\x24\x01\x21\x64"
      "\xe8",
      829);
  *(uint64_t*)0x200000000090 = 0x200000000100;
  memcpy((void*)0x200000000100, "GPL\000", 4);
  *(uint32_t*)0x200000000098 = 0;
  *(uint32_t*)0x20000000009c = 0;
  *(uint64_t*)0x2000000000a0 = 0;
  *(uint32_t*)0x2000000000a8 = 0;
  *(uint32_t*)0x2000000000ac = 0;
  memset((void*)0x2000000000b0, 0, 16);
  *(uint32_t*)0x2000000000c0 = 0;
  *(uint32_t*)0x2000000000c4 = 0;
  *(uint32_t*)0x2000000000c8 = -1;
  *(uint32_t*)0x2000000000cc = 8;
  *(uint64_t*)0x2000000000d0 = 0;
  *(uint32_t*)0x2000000000d8 = 0;
  *(uint32_t*)0x2000000000dc = 0x10;
  *(uint64_t*)0x2000000000e0 = 0;
  *(uint32_t*)0x2000000000e8 = 0;
  *(uint32_t*)0x2000000000ec = 0;
  *(uint32_t*)0x2000000000f0 = -1;
  *(uint32_t*)0x2000000000f4 = 0;
  *(uint64_t*)0x2000000000f8 = 0;
  *(uint64_t*)0x200000000100 = 0;
  *(uint32_t*)0x200000000108 = 0x10;
  *(uint32_t*)0x20000000010c = 0;
  *(uint32_t*)0x200000000110 = 0;
  res =
      syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000000080ul, /*size=*/0x70ul);
  if (res != -1)
    r[0] = res;
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000000ul, /*flags=*/0x200002, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  *(uint32_t*)0x200000000240 = r[1];
  *(uint32_t*)0x200000000244 = r[0];
  memset((void*)0x200000000248, 2, 1);
  syscall(__NR_bpf, /*cmd=*/8ul, /*arg=*/0x200000000240ul, /*size=*/0x10ul);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_802154()))
    printf("the reproducer may not work as expected: 802154 injection setup "
           "failed: %s\n",
           reason);
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}