// https://syzkaller.appspot.com/bug?id=a65b2c6179b59f8fa5cccb3e63e0963ed27eac55
// 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 <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 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 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_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, 0);
  }
}

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 (;;) {
      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[1] = {0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  NONFAILING(syz_genetlink_get_family_id(/*name=*/0, /*fd=*/-1));
  NONFAILING(memcpy((void*)0x2000000000c0, "/dev/ptmx\000", 10));
  syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x2000000000c0ul,
          /*flags=*/0, /*mode=*/0);
  NONFAILING(memcpy((void*)0x200000000080, "/dev/comedi3\000", 13));
  res =
      syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
              /*file=*/0x200000000080ul, /*flags=O_APPEND*/ 0x400, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40946400, /*arg=*/0ul);
  NONFAILING(memcpy(
      (void*)0x200000000180,
      "pcl816\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 20));
  NONFAILING(*(uint32_t*)0x200000000194 = 0x4f27);
  NONFAILING(*(uint32_t*)0x200000000198 = 5);
  NONFAILING(*(uint32_t*)0x20000000019c = 3);
  NONFAILING(*(uint32_t*)0x2000000001a0 = 4);
  NONFAILING(*(uint32_t*)0x2000000001a4 = 5);
  NONFAILING(*(uint32_t*)0x2000000001a8 = 0xcc9);
  NONFAILING(*(uint32_t*)0x2000000001ac = 0xff);
  NONFAILING(*(uint32_t*)0x2000000001b0 = 7);
  NONFAILING(*(uint32_t*)0x2000000001b4 = 0xa);
  NONFAILING(*(uint32_t*)0x2000000001b8 = 0xe8aa);
  NONFAILING(*(uint32_t*)0x2000000001bc = 2);
  NONFAILING(*(uint32_t*)0x2000000001c0 = 1);
  NONFAILING(*(uint32_t*)0x2000000001c4 = 0xfffffffe);
  NONFAILING(*(uint32_t*)0x2000000001c8 = 1);
  NONFAILING(*(uint32_t*)0x2000000001cc = 9);
  NONFAILING(*(uint32_t*)0x2000000001d0 = 0x101);
  NONFAILING(*(uint32_t*)0x2000000001d4 = 0);
  NONFAILING(*(uint32_t*)0x2000000001d8 = 0x1a449);
  NONFAILING(*(uint32_t*)0x2000000001dc = 3);
  NONFAILING(*(uint32_t*)0x2000000001e0 = 0x40000003);
  NONFAILING(*(uint32_t*)0x2000000001e4 = 0x99);
  NONFAILING(*(uint32_t*)0x2000000001e8 = 0xcaa7);
  NONFAILING(*(uint32_t*)0x2000000001ec = 0);
  NONFAILING(*(uint32_t*)0x2000000001f0 = 0x20001e58);
  NONFAILING(*(uint32_t*)0x2000000001f4 = 7);
  NONFAILING(*(uint32_t*)0x2000000001f8 = 0xe69);
  NONFAILING(*(uint32_t*)0x2000000001fc = 0x3c);
  NONFAILING(*(uint32_t*)0x200000000200 = 8);
  NONFAILING(*(uint32_t*)0x200000000204 = 2);
  NONFAILING(*(uint32_t*)0x200000000208 = 0);
  NONFAILING(*(uint32_t*)0x20000000020c = 0xfffffff8);
  NONFAILING(*(uint32_t*)0x200000000210 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40946400,
          /*arg=*/0x200000000180ul);
  syscall(__NR_socket, /*domain=*/2ul, /*type=*/1ul, /*proto=*/0);
  NONFAILING(memcpy((void*)0x200000000300, "/dev/sequencer\000", 15));
  syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000300ul,
          /*flags=*/0, /*mode=*/0);
  NONFAILING(memcpy((void*)0x2000000004c0, "/dev/snd/midiC#D#\000", 18));
  NONFAILING(syz_open_dev(/*dev=*/0x2000000004c0, /*id=*/2,
                          /*flags=O_SYNC|O_NOCTTY|O_NOATIME|O_RDWR*/ 0x141102));
  syscall(__NR_socket, /*domain=*/2ul, /*type=*/2ul, /*proto=*/0);
  NONFAILING(*(uint64_t*)0x2000000001c0 = 0);
  NONFAILING(*(uint64_t*)0x2000000001c8 = 0);
  NONFAILING(*(uint64_t*)0x2000000001d0 = 0x1fffffffffe);
  NONFAILING(*(uint64_t*)0x2000000001d8 = 0xfffffffffffffffd);
  NONFAILING(*(uint64_t*)0x2000000001e0 = 0);
  NONFAILING(*(uint64_t*)0x2000000001e8 = 0);
  NONFAILING(*(uint64_t*)0x2000000001f0 = 0x1000001000);
  NONFAILING(*(uint64_t*)0x2000000001f8 = 9);
  NONFAILING(*(uint64_t*)0x2000000002c0 = 0x3fb);
  NONFAILING(*(uint64_t*)0x2000000002c8 = 3);
  NONFAILING(*(uint64_t*)0x2000000002d0 = 0x400000000001);
  NONFAILING(*(uint64_t*)0x2000000002d8 = 9);
  NONFAILING(*(uint64_t*)0x2000000002e0 = 0x40000000000000);
  NONFAILING(*(uint64_t*)0x2000000002e8 = 0xf);
  NONFAILING(*(uint64_t*)0x2000000002f0 = 0x80000002);
  NONFAILING(*(uint64_t*)0x2000000002f8 = 2);
  syscall(__NR_pselect6, /*n=*/0x40ul, /*inp=*/0x2000000001c0ul, /*outp=*/0ul,
          /*exp=*/0x2000000002c0ul, /*tvp=*/0ul, /*sig=*/0ul);
}
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;
  install_segv_handler();
  for (procid = 0; procid < 5; procid++) {
    if (fork() == 0) {
      loop();
    }
  }
  sleep(1000000);
  return 0;
}