// https://syzkaller.appspot.com/bug?id=99abb037f16e4a12c76b9674bbd3a259d0ddc5fe
// 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 <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.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/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/loop.h>
#include <linux/neighbour.h>
#include <linux/net.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/veth.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

static unsigned long long procid;

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

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 void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

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 unsigned int queue_count = 2;

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_attr(nlmsg, IFLA_NUM_TX_QUEUES, &queue_count, sizeof(queue_count));
  netlink_attr(nlmsg, IFLA_NUM_RX_QUEUES, &queue_count, sizeof(queue_count));
  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 long syz_open_dev(volatile long a0, volatile long a1, volatile long 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 {
    unsigned long nb = a1;
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf) - 1);
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(nb % 10);
      nb /= 10;
    }
    return open(buf, a2 & ~O_CREAT, 0);
  }
}

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty.  In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//%    claim that you wrote the original software. If you use this software
//%    in a product, an acknowledgment in the product documentation would be
//%    appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//%    misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler    madler@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
  unsigned char* out;
  unsigned long outlen;
  unsigned long outcnt;
  const unsigned char* in;
  unsigned long inlen;
  unsigned long incnt;
  int bitbuf;
  int bitcnt;
  jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need)
{
  long val = s->bitbuf;
  while (s->bitcnt < need) {
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    val |= (long)(s->in[s->incnt++]) << s->bitcnt;
    s->bitcnt += 8;
  }
  s->bitbuf = (int)(val >> need);
  s->bitcnt -= need;
  return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s)
{
  s->bitbuf = 0;
  s->bitcnt = 0;
  if (s->incnt + 4 > s->inlen)
    return 2;
  unsigned len = s->in[s->incnt++];
  len |= s->in[s->incnt++] << 8;
  if (s->in[s->incnt++] != (~len & 0xff) ||
      s->in[s->incnt++] != ((~len >> 8) & 0xff))
    return -2;
  if (s->incnt + len > s->inlen)
    return 2;
  if (s->outcnt + len > s->outlen)
    return 1;
  for (; len--; s->outcnt++, s->incnt++) {
    if (s->in[s->incnt])
      s->out[s->outcnt] = s->in[s->incnt];
  }
  return 0;
}
struct puff_huffman {
  short* count;
  short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h)
{
  int first = 0;
  int index = 0;
  int bitbuf = s->bitbuf;
  int left = s->bitcnt;
  int code = first = index = 0;
  int len = 1;
  short* next = h->count + 1;
  while (1) {
    while (left--) {
      code |= bitbuf & 1;
      bitbuf >>= 1;
      int count = *next++;
      if (code - count < first) {
        s->bitbuf = bitbuf;
        s->bitcnt = (s->bitcnt - len) & 7;
        return h->symbol[index + (code - first)];
      }
      index += count;
      first += count;
      first <<= 1;
      code <<= 1;
      len++;
    }
    left = (MAXBITS + 1) - len;
    if (left == 0)
      break;
    if (s->incnt == s->inlen)
      longjmp(s->env, 1);
    bitbuf = s->in[s->incnt++];
    if (left > 8)
      left = 8;
  }
  return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n)
{
  int len;
  for (len = 0; len <= MAXBITS; len++)
    h->count[len] = 0;
  int symbol;
  for (symbol = 0; symbol < n; symbol++)
    (h->count[length[symbol]])++;
  if (h->count[0] == n)
    return 0;
  int left = 1;
  for (len = 1; len <= MAXBITS; len++) {
    left <<= 1;
    left -= h->count[len];
    if (left < 0)
      return left;
  }
  short offs[MAXBITS + 1];
  offs[1] = 0;
  for (len = 1; len < MAXBITS; len++)
    offs[len + 1] = offs[len] + h->count[len];
  for (symbol = 0; symbol < n; symbol++)
    if (length[symbol] != 0)
      h->symbol[offs[length[symbol]]++] = symbol;
  return left;
}
static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode,
                      const struct puff_huffman* distcode)
{
  static const short lens[29] = {3,  4,  5,  6,   7,   8,   9,   10,  11, 13,
                                 15, 17, 19, 23,  27,  31,  35,  43,  51, 59,
                                 67, 83, 99, 115, 131, 163, 195, 227, 258};
  static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
                                 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
  static const short dists[30] = {
      1,    2,    3,    4,    5,    7,    9,    13,    17,    25,
      33,   49,   65,   97,   129,  193,  257,  385,   513,   769,
      1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
  static const short dext[30] = {0, 0, 0,  0,  1,  1,  2,  2,  3,  3,
                                 4, 4, 5,  5,  6,  6,  7,  7,  8,  8,
                                 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
  int symbol;
  do {
    symbol = puff_decode(s, lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 256) {
      if (s->outcnt == s->outlen)
        return 1;
      if (symbol)
        s->out[s->outcnt] = symbol;
      s->outcnt++;
    } else if (symbol > 256) {
      symbol -= 257;
      if (symbol >= 29)
        return -10;
      int len = lens[symbol] + puff_bits(s, lext[symbol]);
      symbol = puff_decode(s, distcode);
      if (symbol < 0)
        return symbol;
      unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
      if (dist > s->outcnt)
        return -11;
      if (s->outcnt + len > s->outlen)
        return 1;
      while (len--) {
        if (dist <= s->outcnt && s->out[s->outcnt - dist])
          s->out[s->outcnt] = s->out[s->outcnt - dist];
        s->outcnt++;
      }
    }
  } while (symbol != 256);
  return 0;
}
static int puff_fixed(struct puff_state* s)
{
  static int virgin = 1;
  static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
  static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  static struct puff_huffman lencode, distcode;
  if (virgin) {
    lencode.count = lencnt;
    lencode.symbol = lensym;
    distcode.count = distcnt;
    distcode.symbol = distsym;
    short lengths[FIXLCODES];
    int symbol;
    for (symbol = 0; symbol < 144; symbol++)
      lengths[symbol] = 8;
    for (; symbol < 256; symbol++)
      lengths[symbol] = 9;
    for (; symbol < 280; symbol++)
      lengths[symbol] = 7;
    for (; symbol < FIXLCODES; symbol++)
      lengths[symbol] = 8;
    puff_construct(&lencode, lengths, FIXLCODES);
    for (symbol = 0; symbol < MAXDCODES; symbol++)
      lengths[symbol] = 5;
    puff_construct(&distcode, lengths, MAXDCODES);
    virgin = 0;
  }
  return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s)
{
  static const short order[19] = {16, 17, 18, 0, 8,  7, 9,  6, 10, 5,
                                  11, 4,  12, 3, 13, 2, 14, 1, 15};
  int nlen = puff_bits(s, 5) + 257;
  int ndist = puff_bits(s, 5) + 1;
  int ncode = puff_bits(s, 4) + 4;
  if (nlen > MAXLCODES || ndist > MAXDCODES)
    return -3;
  short lengths[MAXCODES];
  int index;
  for (index = 0; index < ncode; index++)
    lengths[order[index]] = puff_bits(s, 3);
  for (; index < 19; index++)
    lengths[order[index]] = 0;
  short lencnt[MAXBITS + 1], lensym[MAXLCODES];
  struct puff_huffman lencode = {lencnt, lensym};
  int err = puff_construct(&lencode, lengths, 19);
  if (err != 0)
    return -4;
  index = 0;
  while (index < nlen + ndist) {
    int symbol;
    int len;
    symbol = puff_decode(s, &lencode);
    if (symbol < 0)
      return symbol;
    if (symbol < 16)
      lengths[index++] = symbol;
    else {
      len = 0;
      if (symbol == 16) {
        if (index == 0)
          return -5;
        len = lengths[index - 1];
        symbol = 3 + puff_bits(s, 2);
      } else if (symbol == 17)
        symbol = 3 + puff_bits(s, 3);
      else
        symbol = 11 + puff_bits(s, 7);
      if (index + symbol > nlen + ndist)
        return -6;
      while (symbol--)
        lengths[index++] = len;
    }
  }
  if (lengths[256] == 0)
    return -9;
  err = puff_construct(&lencode, lengths, nlen);
  if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
    return -7;
  short distcnt[MAXBITS + 1], distsym[MAXDCODES];
  struct puff_huffman distcode = {distcnt, distsym};
  err = puff_construct(&distcode, lengths + nlen, ndist);
  if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
    return -8;
  return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest, unsigned long* destlen,
                const unsigned char* source, unsigned long sourcelen)
{
  struct puff_state s = {
      .out = dest,
      .outlen = *destlen,
      .outcnt = 0,
      .in = source,
      .inlen = sourcelen,
      .incnt = 0,
      .bitbuf = 0,
      .bitcnt = 0,
  };
  int err;
  if (setjmp(s.env) != 0)
    err = 2;
  else {
    int last;
    do {
      last = puff_bits(&s, 1);
      int type = puff_bits(&s, 2);
      err = type == 0 ? puff_stored(&s)
                      : (type == 1 ? puff_fixed(&s)
                                   : (type == 2 ? puff_dynamic(&s) : -1));
      if (err != 0)
        break;
    } while (!last);
  }
  *destlen = s.outcnt;
  return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
                             unsigned long sourcelen, int dest_fd)
{
  if (sourcelen < ZLIB_HEADER_WIDTH)
    return 0;
  source += ZLIB_HEADER_WIDTH;
  sourcelen -= ZLIB_HEADER_WIDTH;
  const unsigned long max_destlen = 132 << 20;
  void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
                   MAP_PRIVATE | MAP_ANON, -1, 0);
  if (ret == MAP_FAILED)
    return -1;
  unsigned char* dest = (unsigned char*)ret;
  unsigned long destlen = max_destlen;
  int err = puff(dest, &destlen, source, sourcelen);
  if (err) {
    munmap(dest, max_destlen);
    errno = -err;
    return -1;
  }
  if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
    munmap(dest, max_destlen);
    return -1;
  }
  return munmap(dest, max_destlen);
}

static int setup_loop_device(unsigned char* data, unsigned long size,
                             const char* loopname, int* loopfd_p)
{
  int err = 0, loopfd = -1;
  int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (puff_zlib_to_file(data, size, memfd)) {
    err = errno;
    goto error_close_memfd;
  }
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  close(memfd);
  *loopfd_p = loopfd;
  return 0;

error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return -1;
}

static void reset_loop_device(const char* loopname)
{
  int loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    return;
  }
  if (ioctl(loopfd, LOOP_CLR_FD, 0)) {
  }
  close(loopfd);
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile long flags, volatile long optsarg,
                            volatile long change_dir,
                            volatile unsigned long size, volatile long image)
{
  unsigned char* data = (unsigned char*)image;
  int res = -1, err = 0, need_loop_device = !!size;
  char* mount_opts = (char*)optsarg;
  char* target = (char*)dir;
  char* fs = (char*)fsarg;
  char* source = NULL;
  char loopname[64];
  if (need_loop_device) {
    int loopfd;
    memset(loopname, 0, sizeof(loopname));
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    if (setup_loop_device(data, size, loopname, &loopfd) == -1)
      return -1;
    close(loopfd);
    source = loopname;
  }
  mkdir(target, 0777);
  char opts[256];
  memset(opts, 0, sizeof(opts));
  if (strlen(mount_opts) > (sizeof(opts) - 32)) {
  }
  strncpy(opts, mount_opts, sizeof(opts) - 32);
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    bool has_remount_ro = false;
    char* remount_ro_start = strstr(opts, "errors=remount-ro");
    if (remount_ro_start != NULL) {
      char after = *(remount_ro_start + strlen("errors=remount-ro"));
      char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1);
      has_remount_ro = ((before == '\0' || before == ',') &&
                        (after == '\0' || after == ','));
    }
    if (strstr(opts, "errors=panic") || !has_remount_ro)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  } else if (strncmp(fs, "gfs2", 4) == 0 &&
             (strstr(opts, "errors=panic") || strstr(opts, "debug"))) {
    strcat(opts, ",errors=withdraw");
  }
  res = mount(source, target, fs, flags, opts);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  res = open(target, O_RDONLY | O_DIRECTORY);
  if (res == -1) {
    err = errno;
    goto error_clear_loop;
  }
  if (change_dir) {
    res = chdir(target);
    if (res == -1) {
      err = errno;
    }
  }

error_clear_loop:
  if (need_loop_device)
    reset_loop_device(loopname);
  errno = err;
  return res;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
  const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW;

retry:
  while (umount2(dir, umount_flags) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  struct dirent* ep = 0;
  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);
    while (umount2(filename, umount_flags) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, umount_flags))
        exit(1);
    }
  }
  closedir(dp);
  for (int i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, umount_flags))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

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 reset_loop()
{
  char buf[64];
  snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
  int loopfd = open(buf, O_RDWR);
  if (loopfd != -1) {
    ioctl(loopfd, LOOP_CLR_FD, 0);
    close(loopfd);
  }
}

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

#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++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    reset_loop();
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  syz_mount_image$hfs arguments: [
  //    fs: ptr[in, buffer] {
  //      buffer: {68 66 73 00} (length 0x4)
  //    }
  //    dir: ptr[in, buffer] {
  //      buffer: {2e 2f 62 75 73 00} (length 0x6)
  //    }
  //    flags: mount_flags = 0x3000080 (8 bytes)
  //    opts: ptr[inout, array[ANYUNION]] {
  //      array[ANYUNION] {
  //        union ANYUNION {
  //          ANYBLOB: buffer: {71 75 69 65 74 2c 63 6f 64 65 70 61 67 65 3d 69
  //          73 6f 38 38 35 39 2d 31 35 2c 70 61 72 74 3d 30 78 30 30 30 30 30
  //          30 30 00 00 00 00 00 00 00 00 66 2c 00 a2 00 00 00 07 00 00 00 00
  //          ed e9 de bf 53 0c 3c c4 d0 4b 54 89 19 ac a0 c2 93 7d 4d a1 fc 31
  //          dc 42 fc 2e 3e} (length 0x57)
  //        }
  //        union ANYUNION {
  //          ANYRES8: ANYRES8 (resource)
  //        }
  //      }
  //    }
  //    chdir: int8 = 0x15 (1 bytes)
  //    size: len = 0x2e3 (8 bytes)
  //    img: ptr[in, buffer] {
  //      buffer: (compressed buffer with length 0x2e3)
  //    }
  //  ]
  //  returns fd_dir
  NONFAILING(memcpy((void*)0x200000000180, "hfs\000", 4));
  NONFAILING(memcpy((void*)0x200000000100, "./bus\000", 6));
  NONFAILING(memcpy(
      (void*)0x200000000300,
      "\x71\x75\x69\x65\x74\x2c\x63\x6f\x64\x65\x70\x61\x67\x65\x3d\x69\x73\x6f"
      "\x38\x38\x35\x39\x2d\x31\x35\x2c\x70\x61\x72\x74\x3d\x30\x78\x30\x30\x30"
      "\x30\x30\x30\x30\x00\x00\x00\x00\x00\x00\x00\x00\x66\x2c\x00\xa2\x00\x00"
      "\x00\x07\x00\x00\x00\x00\xed\xe9\xde\xbf\x53\x0c\x3c\xc4\xd0\x4b\x54\x89"
      "\x19\xac\xa0\xc2\x93\x7d\x4d\xa1\xfc\x31\xdc\x42\xfc\x2e\x3e",
      87));
  NONFAILING(*(uint8_t*)0x200000000357 = -1);
  NONFAILING(memcpy(
      (void*)0x200000000380,
      "\x78\x9c\xec\xdd\x4d\x6b\x14\x49\x1c\xc7\xf1\x5f\xf5\x4c\x92\xc9\x66\xc8"
      "\x76\x1e\x96\x85\x3d\x66\x37\xb0\x7b\x59\xb2\xd9\xcb\xb2\x97\x09\x32\x2f"
      "\x42\x3c\x88\x9a\x19\x21\x38\x44\x34\x11\xd4\x8b\x51\x3c\x89\xe8\xdd\xbb"
      "\x6f\xc1\xb7\x20\x78\x51\xf4\x2a\xe8\xc9\x93\x2f\x60\x04\xa1\xa5\xaa\x6b"
      "\x9e\x7b\xba\x67\x24\xd3\x9d\xc1\xef\x07\x0c\x9d\xee\xfa\x77\xff\x6b\xfa"
      "\xa1\xea\x3f\x60\x5a\x00\x7e\x58\xe7\xea\x1f\x9e\xff\xfb\xc9\xfe\x33\x52"
      "\x49\x25\xe9\xd1\xff\x52\x20\xa9\x22\x95\x25\xfd\xa2\x5f\x2b\xb7\x0e\x8f"
      "\x0f\x8e\x5b\xcd\x46\xca\x7e\xda\x91\x63\xa3\x8c\xe2\x48\x33\xd2\x68\xff"
      "\xb0\x99\x14\x5b\x91\x8f\xf0\x42\xfb\x5b\x59\xd5\xfe\x75\x98\x8d\x28\x8a"
      "\xf6\x3e\x4a\x3a\x2a\x3a\x11\x14\xca\xdd\xfd\x09\x02\x69\xc9\xdf\x9d\x6e"
      "\x7b\x25\xf7\xcc\xd2\xdd\xff\xce\xb8\x93\x53\xce\x63\xde\x18\x7b\x56\x6f"
      "\x6b\xb5\xe8\x3c\x00\x00\xc5\xf2\xe3\x7f\xe0\xc7\xf9\xaa\x9f\xbf\x07\x81"
      "\xb4\xed\x87\xfd\x33\x39\xfe\xc7\x16\xa6\x8e\x68\xcf\x24\x8f\xb3\x24\x4a"
      "\xdd\x6a\xda\x6a\xfb\xf1\xdf\x55\x59\x91\xb1\xe7\xf7\x67\xb7\xa9\x57\xef"
      "\xb9\x12\xce\x6e\x0f\x3a\x55\xe2\x24\x47\x1e\x3e\x1b\x8b\x8a\xaf\xac\x81"
      "\x09\xa6\xc9\xaa\x2a\x5d\x2e\xc1\xf2\xd5\x83\x56\xf3\xef\xfd\xeb\xad\x46"
      "\xa0\x07\xaa\x79\x7d\xcd\x36\xdd\xcf\x46\x7c\xe9\x76\x64\x64\xbb\x95\x50"
      "\x9b\x8e\x7a\x3f\xe1\xde\x14\xdf\x2b\x49\x33\xca\x15\xd7\x87\x05\xdb\x87"
      "\xdd\x31\xf9\x6f\x24\xed\x6e\x9a\x4f\x7b\x5a\xe6\x95\x79\x63\x2e\x9a\x50"
      "\xcf\xd4\xe8\xce\xff\xca\x91\xb1\xa7\xc9\x9d\xa9\x70\xe8\x4c\xc5\xf9\xef"
      "\x8c\xdf\xa3\xeb\x65\x68\x5b\xc9\x3f\x36\x6a\xb5\x5a\x30\xd0\x64\xcd\x1d"
      "\xe4\x37\x7f\x04\x2f\xa3\x97\x95\xe4\x8a\x44\x9d\x2b\x6a\x4d\x83\x5f\x10"
      "\x84\x59\x79\xba\xa8\xf5\xa1\xa8\xb8\x77\xff\x64\x44\x6d\xc4\x51\x7b\xcb"
      "\x03\x51\xbb\x9d\xdf\xc6\x44\x6d\x0e\x1c\xcb\xf6\xa6\x7b\x35\x8f\x3f\xde"
      "\xac\x99\x27\xe6\xbc\xd9\xd2\x67\xbd\x50\xbd\x6f\xfe\x1f\xd8\xfc\xb6\x95"
      "\x7a\x67\xf6\xee\x1a\xb3\x1d\x0f\x05\xee\x13\x8f\xfb\xb3\x98\x7c\xb8\xb2"
      "\xdb\x67\x38\x32\x72\x9c\xe8\x42\x75\x70\x4d\xf7\x53\x5c\x1a\x97\xfa\x97"
      "\x28\x75\x33\xbc\x77\xfe\x09\x7c\x2f\xa5\xcd\x63\x5d\xd1\x7f\x5a\x3d\xba"
      "\x73\xf7\x5a\xa9\xd5\x6a\xde\xb4\x0b\x97\x13\x16\x6e\x54\xbb\x6b\x16\x1e"
      "\x4a\x89\x6d\x0a\x58\x08\xd4\x5b\xa3\x93\xde\xa6\x25\xc5\x5f\x44\x8e\x44"
      "\x75\x06\xa5\x3c\x53\xfd\xeb\x54\x77\x68\x9f\x1f\x99\x8d\xed\x5d\x96\x4b"
      "\x07\xcf\xcc\x95\x50\xc4\x42\xfd\x75\xbe\x17\x52\x11\x0b\x79\x3c\xa8\x50"
      "\xb4\xde\x49\xcf\x6c\xfa\x32\x97\x84\x90\x37\x37\xef\x8a\xeb\xbf\xbe\x7a"
      "\x65\xc7\x4d\xf6\xec\x8f\x30\x65\x9e\x9e\x5e\x64\xf6\x2a\xa0\xc8\xce\xb1"
      "\xbb\x15\x50\x65\x20\x7e\xdd\x2d\xfd\x34\x55\x05\xb7\x32\xbe\x82\x9b\xb4"
      "\xe6\xfa\xfd\x4f\xe9\x8f\xee\xaa\xaf\x51\xc6\x11\x43\x9f\xe7\x7c\x88\xd2"
      "\xa6\x7e\x96\xa9\xeb\xad\x2e\xf1\xfd\x3f\x00\x00\x00\x00\x00\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\xc0\xbc\xc9\xe3\xbf\x13\x14\xdd\x47\x00\x00\x00"
      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe6\x5d\xf7\xfd"
      "\xbf\xea\xbc\xff\x57\x93\xbd\xff\x77\xf8\x2f\x7f\x97\xe2\x37\xbc\x9c\xca"
      "\xfb\x7f\x9f\x1e\x8a\xf7\xff\x02\xb3\xf7\x2d\x00\x00\xff\xff\x48\xfa\x8a"
      "\x24",
      739));
  NONFAILING(
      syz_mount_image(/*fs=*/0x200000000180, /*dir=*/0x200000000100,
                      /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_DIRSYNC*/ 0x3000080,
                      /*opts=*/0x200000000300, /*chdir=*/0x15, /*size=*/0x2e3,
                      /*img=*/0x200000000380));
  //  open arguments: [
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8)
  //    }
  //    flags: open_flags = 0x14927e (8 bytes)
  //    mode: open_mode = 0x6a (8 bytes)
  //  ]
  //  returns fd
  NONFAILING(memcpy((void*)0x2000000001c0, "./file1\000", 8));
  syscall(__NR_open, /*file=*/0x2000000001c0ul,
          /*flags=O_TRUNC|O_SYNC|O_NOATIME|O_LARGEFILE|O_CREAT|O_RDWR|0x3c*/
          0x14927eul, /*mode=S_IWOTH|S_IXGRP|S_IRGRP|S_IXUSR*/ 0x6aul);
  //  syz_open_dev$loop arguments: [
  //    dev: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6c 6f 6f 70 23 00} (length 0xb)
  //    }
  //    id: intptr = 0x0 (8 bytes)
  //    flags: open_flags = 0x0 (8 bytes)
  //  ]
  //  returns fd_loop
  NONFAILING(memcpy((void*)0x200000000140, "/dev/loop#\000", 11));
  res = -1;
  NONFAILING(res = syz_open_dev(/*dev=*/0x200000000140, /*id=*/0, /*flags=*/0));
  if (res != -1)
    r[0] = res;
  //  ioctl$LOOP_SET_STATUS64 arguments: [
  //    fd: fd_loop (resource)
  //    cmd: const = 0x4c04 (4 bytes)
  //    arg: ptr[in, loop_info64] {
  //      loop_info64 {
  //        lo_device: const = 0x0 (8 bytes)
  //        lo_inode: const = 0x0 (8 bytes)
  //        lo_rdevice: const = 0x0 (8 bytes)
  //        lo_offset: int64 = 0x3 (8 bytes)
  //        lo_sizelimit: int64 = 0x4 (8 bytes)
  //        lo_number: const = 0x0 (4 bytes)
  //        lo_enc_type: lo_encrypt_type = 0x0 (4 bytes)
  //        lo_enc_key_size: int32 = 0x12 (4 bytes)
  //        lo_flags: lo_flags = 0x3 (4 bytes)
  //        lo_file_name: buffer: {d2 27 30 78 cf 61 75 86 61 87 bb f6 23 72 bb
  //        b6 5d 94 0f 27 bc 28 a5 a4 42 ff 5a 8d 37 4a 18 20 08 a1 fd 92 70 1c
  //        e5 3e e6 aa 5d 92 29 17 ae ec bf b3 db 24 b0 99 09 c2 4c c1 57 a3 78
  //        0c f5 d5} (length 0x40) lo_crypt_name: buffer: {09 b4 98 09 fc 32 a5
  //        fc 7b e9 f8 8c 6b 84 90 79 98 10 5e 31 11 da a2 bd 51 b0 d0 c3 bc 93
  //        fb 2d 0f 02 44 a8 c7 a9 9a 75 e7 66 13 c7 45 45 8f 5c 12 12 e7 2d 93
  //        b2 72 fe d8 19 41 f0 4e dd 00 59} (length 0x40) lo_enc_key: buffer:
  //        {a9 60 f0 80 42 e0 91 19 b6 f8 7d e5 9f 19 91 2c 53 88 84 e7 a9 5c
  //        3d 50 e4 be 66 18 4e 29 5e b1} (length 0x20) lo_init: array[int64] {
  //          int64 = 0x4 (8 bytes)
  //          int64 = 0x6c (8 bytes)
  //        }
  //      }
  //    }
  //  ]
  NONFAILING(*(uint64_t*)0x200000000300 = 0);
  NONFAILING(*(uint64_t*)0x200000000308 = 0);
  NONFAILING(*(uint64_t*)0x200000000310 = 0);
  NONFAILING(*(uint64_t*)0x200000000318 = 3);
  NONFAILING(*(uint64_t*)0x200000000320 = 4);
  NONFAILING(*(uint32_t*)0x200000000328 = 0);
  NONFAILING(*(uint32_t*)0x20000000032c = 0);
  NONFAILING(*(uint32_t*)0x200000000330 = 0x12);
  NONFAILING(*(uint32_t*)0x200000000334 = 3);
  NONFAILING(
      memcpy((void*)0x200000000338,
             "\xd2\x27\x30\x78\xcf\x61\x75\x86\x61\x87\xbb\xf6\x23\x72\xbb\xb6"
             "\x5d\x94\x0f\x27\xbc\x28\xa5\xa4\x42\xff\x5a\x8d\x37\x4a\x18\x20"
             "\x08\xa1\xfd\x92\x70\x1c\xe5\x3e\xe6\xaa\x5d\x92\x29\x17\xae\xec"
             "\xbf\xb3\xdb\x24\xb0\x99\x09\xc2\x4c\xc1\x57\xa3\x78\x0c\xf5\xd5",
             64));
  NONFAILING(
      memcpy((void*)0x200000000378,
             "\x09\xb4\x98\x09\xfc\x32\xa5\xfc\x7b\xe9\xf8\x8c\x6b\x84\x90\x79"
             "\x98\x10\x5e\x31\x11\xda\xa2\xbd\x51\xb0\xd0\xc3\xbc\x93\xfb\x2d"
             "\x0f\x02\x44\xa8\xc7\xa9\x9a\x75\xe7\x66\x13\xc7\x45\x45\x8f\x5c"
             "\x12\x12\xe7\x2d\x93\xb2\x72\xfe\xd8\x19\x41\xf0\x4e\xdd\x00\x59",
             64));
  NONFAILING(
      memcpy((void*)0x2000000003b8,
             "\xa9\x60\xf0\x80\x42\xe0\x91\x19\xb6\xf8\x7d\xe5\x9f\x19\x91\x2c"
             "\x53\x88\x84\xe7\xa9\x5c\x3d\x50\xe4\xbe\x66\x18\x4e\x29\x5e\xb1",
             32));
  NONFAILING(*(uint64_t*)0x2000000003d8 = 4);
  NONFAILING(*(uint64_t*)0x2000000003e0 = 0x6c);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x4c04, /*arg=*/0x200000000300ul);
  //  ioctl$BLKFLSBUF arguments: [
  //    fd: fd_block (resource)
  //    cmd: const = 0x1261 (4 bytes)
  //    arg: nil
  //  ]
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x1261, /*arg=*/0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: nil
  //    flags: open_flags = 0x143041 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul,
          /*flags=O_SYNC|O_NOATIME|O_CREAT|FASYNC|O_WRONLY*/ 0x143041,
          /*mode=*/0);
  //  truncate arguments: [
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 62 75 73 00} (length 0x6)
  //    }
  //    len: intptr = 0xa00d (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000040, "./bus\000", 6));
  syscall(__NR_truncate, /*file=*/0x200000000040ul, /*len=*/0xa00dul);
}
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;
  if ((reason = setup_802154())) {
    fprintf(stderr, "reproducer setup failed: 802154 injection: %s\n", reason);
    exit(1);
  }
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}