// https://syzkaller.appspot.com/bug?id=2431068eb52548f20447545f1948b727e87e720a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.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>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _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(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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);
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  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, MNT_DETACH) == 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, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (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, MNT_DETACH))
          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);
  int i;
  for (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) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      setup_test();
      execute_one();
      reset_test();
      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 < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  long res = 0;
  NONFAILING(*(uint16_t*)0x20002000 = 0xa);
  NONFAILING(*(uint16_t*)0x20002002 = htobe16(0));
  NONFAILING(*(uint32_t*)0x20002004 = 0);
  NONFAILING(*(uint8_t*)0x20002008 = 0);
  NONFAILING(*(uint8_t*)0x20002009 = 0);
  NONFAILING(*(uint8_t*)0x2000200a = 0);
  NONFAILING(*(uint8_t*)0x2000200b = 0);
  NONFAILING(*(uint8_t*)0x2000200c = 0);
  NONFAILING(*(uint8_t*)0x2000200d = 0);
  NONFAILING(*(uint8_t*)0x2000200e = 0);
  NONFAILING(*(uint8_t*)0x2000200f = 0);
  NONFAILING(*(uint8_t*)0x20002010 = 0);
  NONFAILING(*(uint8_t*)0x20002011 = 0);
  NONFAILING(*(uint8_t*)0x20002012 = 0);
  NONFAILING(*(uint8_t*)0x20002013 = 0);
  NONFAILING(*(uint8_t*)0x20002014 = 0);
  NONFAILING(*(uint8_t*)0x20002015 = 0);
  NONFAILING(*(uint8_t*)0x20002016 = 0);
  NONFAILING(*(uint8_t*)0x20002017 = 0);
  NONFAILING(*(uint32_t*)0x20002018 = 0);
  NONFAILING(*(uint16_t*)0x2000201c = 0xa);
  NONFAILING(*(uint16_t*)0x2000201e = htobe16(0));
  NONFAILING(*(uint32_t*)0x20002020 = 0);
  NONFAILING(*(uint8_t*)0x20002024 = 0);
  NONFAILING(*(uint8_t*)0x20002025 = 0);
  NONFAILING(*(uint8_t*)0x20002026 = 0);
  NONFAILING(*(uint8_t*)0x20002027 = 0);
  NONFAILING(*(uint8_t*)0x20002028 = 0);
  NONFAILING(*(uint8_t*)0x20002029 = 0);
  NONFAILING(*(uint8_t*)0x2000202a = 0);
  NONFAILING(*(uint8_t*)0x2000202b = 0);
  NONFAILING(*(uint8_t*)0x2000202c = 0);
  NONFAILING(*(uint8_t*)0x2000202d = 0);
  NONFAILING(*(uint8_t*)0x2000202e = 0);
  NONFAILING(*(uint8_t*)0x2000202f = 0);
  NONFAILING(*(uint8_t*)0x20002030 = 0);
  NONFAILING(*(uint8_t*)0x20002031 = 0);
  NONFAILING(*(uint8_t*)0x20002032 = 0);
  NONFAILING(*(uint8_t*)0x20002033 = 0);
  NONFAILING(*(uint32_t*)0x20002034 = 1);
  NONFAILING(*(uint16_t*)0x20002038 = 0);
  NONFAILING(*(uint32_t*)0x2000203c = 0);
  NONFAILING(*(uint32_t*)0x20002040 = 0);
  NONFAILING(*(uint32_t*)0x20002044 = 0);
  NONFAILING(*(uint32_t*)0x20002048 = 0);
  NONFAILING(*(uint32_t*)0x2000204c = 0);
  NONFAILING(*(uint32_t*)0x20002050 = 0);
  NONFAILING(*(uint32_t*)0x20002054 = 0);
  NONFAILING(*(uint32_t*)0x20002058 = 0);
  syscall(__NR_setsockopt, -1, 0x29, 0xd3, 0x20002000, 0x5c);
  NONFAILING(*(uint32_t*)0x20002000 = 0);
  NONFAILING(*(uint32_t*)0x20002004 = 0xfffffffe);
  NONFAILING(*(uint32_t*)0x20002008 = 0xfffffffe);
  NONFAILING(*(uint32_t*)0x2000200c = 0);
  NONFAILING(*(uint32_t*)0x20002010 = 0);
  syscall(__NR_setsockopt, -1, 6, 0x1d, 0x20002000, 0x14);
  res = syscall(__NR_socket, 0xa, 1, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x20001fde = 0);
  syscall(__NR_setsockopt, r[0], 0x29, 0x40, 0x20001fde, 4);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}