// https://syzkaller.appspot.com/bug?id=bf95da1c68b889380395af19f1953e91b772d3ea
// 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>

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 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_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 long syz_genetlink_get_family_id(volatile long name,
                                        volatile long sock_arg)
{
  int fd = sock_arg;
  if (fd < 0) {
    fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (fd == -1) {
      return -1;
    }
  }
  struct nlmsg nlmsg_tmp;
  int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false);
  if ((int)sock_arg < 0)
    close(fd);
  if (ret < 0) {
    return -1;
  }
  return ret;
}

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 (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      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;
  *(uint64_t*)0x20000980 = 0;
  *(uint32_t*)0x20000988 = 0;
  *(uint64_t*)0x20000990 = 0x20000780;
  *(uint64_t*)0x20000780 = 0x200001c0;
  memcpy(
      (void*)0x200001c0,
      "\x6a\x83\xbe\xa6\x19\xd9\xa3\xe2\x2b\x9a\x46\xa3\x1d\x21\x04\x7c\xa0\xb7"
      "\x7c\x4d\x64\xd0\x9e\x3d\x6c\xe0\x66\x50\xb2\x76\x44\x82\x85\x11\x27\xf9"
      "\x7e\x45\xac\x75\x9e\x92\xaa\x32\xcf\xf3\xea\x2f\x6d\xac\xf3\xb2\x4f\x97"
      "\xff\x96\xd5\x33\x21\x0f\xfc\x0b\x78\x80\x82\x37\x68\xa5\x9b\x59\xfb\x03"
      "\x97\xf5\xfa\x81\xdc\x67\x17\xd6\xf8\x9d\x75\xa1\x3b\xfa\x12\xaa\x93\xdd"
      "\x20\x0c\xde\x47\xd6\xb8\x2c\xfd\x9f\xba\x85\x37\x54\x33\xa2\xe4\x01\xa6"
      "\x66\x66\x17\x57\xed\x89\xc1\xf8\xe5\x0d\x9f\x0b\x7d\xc9\xb2\x57\x89\x8e"
      "\x5d\x86\xa4\xb5\x69\xdc\x7c\x2d\x53\x8c\xf5\xb7\xec\x21\xe9\xf7\x64\xe1"
      "\xf6\xab\xa9\x7e\xfc\xbf\x31\xa5\x72\x96\x3a\xb4\x41\x49\xcd\xf0\xfa\x39"
      "\xe9\x32\x93\xbf\x92\x3e\xfc\xc2\x40\x61\x96",
      173);
  *(uint64_t*)0x20000788 = 0xad;
  *(uint64_t*)0x20000790 = 0;
  *(uint64_t*)0x20000798 = 0;
  *(uint64_t*)0x200007a0 = 0;
  *(uint64_t*)0x200007a8 = 0;
  *(uint64_t*)0x200007b0 = 0;
  *(uint64_t*)0x200007b8 = 0;
  *(uint64_t*)0x200007c0 = 0;
  *(uint64_t*)0x200007c8 = 0;
  *(uint64_t*)0x200007d0 = 0;
  *(uint64_t*)0x200007d8 = 0;
  *(uint64_t*)0x200007e0 = 0;
  *(uint64_t*)0x200007e8 = 0;
  *(uint64_t*)0x200007f0 = 0;
  *(uint64_t*)0x200007f8 = 0;
  *(uint64_t*)0x20000800 = 0;
  *(uint64_t*)0x20000808 = 0;
  *(uint64_t*)0x20000998 = 9;
  *(uint64_t*)0x200009a0 = 0;
  *(uint64_t*)0x200009a8 = 0x140;
  *(uint32_t*)0x200009b0 = 0;
  syscall(__NR_sendmsg, -1, 0x20000980ul, 0x2004000ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0x10);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x20000280, "TIPCv2\000", 7);
  res = -1;
  res = syz_genetlink_get_family_id(0x20000280, -1);
  if (res != -1)
    r[1] = res;
  *(uint64_t*)0x20000740 = 0;
  *(uint32_t*)0x20000748 = 0;
  *(uint64_t*)0x20000750 = 0x20000700;
  *(uint64_t*)0x20000700 = 0x200001c0;
  memcpy((void*)0x200001c0, "<\000\000\000", 4);
  *(uint16_t*)0x200001c4 = r[1];
  memcpy((void*)0x200001c6,
         "\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x28\x00\x01"
         "\x80\x0e\x00\x01\x00\x65\x74\x68\x3a\x72",
         27);
  *(uint64_t*)0x20000708 = 0x3c;
  *(uint64_t*)0x20000758 = 1;
  *(uint64_t*)0x20000760 = 0;
  *(uint64_t*)0x20000768 = 0;
  *(uint32_t*)0x20000770 = 0;
  syscall(__NR_sendmsg, r[0], 0x20000740ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
  syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
  loop();
  return 0;
}