// https://syzkaller.appspot.com/bug?id=451cabf93ff062700399d95a331e4eb2dfd66e4f
// 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 <stdarg.h>
#include <stdbool.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>

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);
}

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;
}

#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) {
  }
}

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;
  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();
      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[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint64_t*)0x20000280 = 0);
  NONFAILING(*(uint32_t*)0x20000288 = 0);
  NONFAILING(*(uint64_t*)0x20000290 = 0x20000000);
  NONFAILING(*(uint64_t*)0x20000000 = 0x200006c0);
  NONFAILING(memcpy((void*)0x200006c0, "\x28\x00\x00\x00\x10\x00\x5f\xba\x08"
                                       "\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                                       "\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x200006d4 = 0);
  NONFAILING(memcpy(
      (void*)0x200006d8,
      "\x03\x00\x00\x80\x00\x00\x00\x00\x08\x00\x1b\x00\x00\x00\x00\x00\x07\x93"
      "\xae\x2d\xa5\xac\xc7\x99\xb5\x8c\xa6\x5a\x84\x14\xef\x73\x99\xa8\x7e\xca"
      "\x0d\xc2\x76\x29\x8b\xb0\xec\x93\x13\xae\x5d\x3b\x19\x92\x2f\x9a\x80\xac"
      "\xa8\x94\x1f\x62\x81\xf7\xcd\x8b\xbc\x2c\xd0\x18\xaa\x16\xdc\x1f\x8d\xed"
      "\xc3\x32\x6c\x89\xf6\x58\x04\x00\x00\x00\x78\x2b\x06\xaa\x3e\x87\x03\x7b"
      "\x9c\x80\x58\x30\x07\x9e\xd0\xf5\x88\x44\x93\x73\xbd\xbc\x44\x96\xa7\xa3"
      "\x06\x88\xd8\xff\xbd\x74\xb1\xdc\xa2\x45\xc0\x08\x81\xf9\x4d\x67\x25\x3b"
      "\x0a\x36\x9a\xa4\x97\x81\x6e\xc1\xf4\xa1\xd9\x12\xcf\x7c\x4c\xef\xf6\xd3"
      "\x61\xdc\x20\x48\x1b\xc5\xa4\x42\x64\x82\xd0\xb8\x05\xf0\x0a\xc5\xbd\x62"
      "\x65\x2e\x21\xfd\x03\x00\x4e\xa1\x23\xd3\xa2\xd5\x5b\xae\xff\xbb\x83\xdb"
      "\x1e\xa7\x2f\xea\x06\xa4\x45\x9d\xeb\xa2\x23\xf1\x8f\x21\xf2\x5b\x3e\x59"
      "\x2e\x13\xba\x69\x15\xd6\x91\xd7\x42\xc1\xe1\xd4\xf1\xde\x92\x66\xc8\xce"
      "\x87\x34\xd7\x2e\x75\xf9\xe0\xf6\xdd\xa5\x2b\xdb\x76\x2e\x05\x2e\xbd\x4a"
      "\xb2\xb6\x4e\x9f\x55\x58\x4e\xf1\x43\x7d\x09\xb4\xa3\x4c\x6b\x4b\x7e\xea"
      "\x9d\x84\xf3\xaf\x58\x6a\x22\x37\x27\x1b\xba\x94\x4e\xa8\x7e\xfd\xbf\x2e"
      "\x1f\x37\x86\xb5\x98\xd0\xa3\x03\x92\x61\xe3\xea\x8a\x2e\xbf\xc5\x46\x6d"
      "\x15\x27\xfb\xf9\x11\x0e\x14\xc9\x40\x05\xaa\x32\x2a\x05\xda\x7c\xb2\xcc"
      "\xd4\x3d\x43\x32\x8e\x50\x7e\x73\xcf\xe6\xf9\x56\x7b\x8e\x9f\xbf\xd2\x71"
      "\x5b\x2e\x4d\x9c\x5f\xf1\x0b\x67\x69\x15\x93\xd9\x32\x8a\xe0\xd4\x30\x99"
      "\xf6\x21\x9f\x23\xe2\x36\xe9\xc2\x73\xbd\x0d\x3b\x70\x60\xfd\xd6\x27\xb0"
      "\x37\x25\xb2\xaf\xc7\xb2\xb0\xb4\x24\x80\x35\x2a\x53\x50\xab\x01\x8b\xc8"
      "\x7f\xf2\x4e\x0e\x13\x54\xcf\x88\x31\x8f\x8d\xf5\x2d\xbd\x08\xf6\x02\x7e"
      "\x36\x51\x69\xc6\xff\x2a\x50\x0b\x7c\xee\xda\xd6\xc4\xed\x0a\x7c\xd0\x57"
      "\xad\xe8\x7b\xc2\x87\xb6\x6b\x4b\x82\xd2\xfb\x39\xc5\x82\xf2\xea\x3c\xd8"
      "\x01\x4f\xbe\x28\x0b\xa8\xca\x4c\x34\xb6\x5d\x8a\x8e\x3a\xbb\xfe\xa4",
      449));
  NONFAILING(*(uint64_t*)0x20000008 = 0x28);
  NONFAILING(*(uint64_t*)0x20000298 = 1);
  NONFAILING(*(uint64_t*)0x200002a0 = 0);
  NONFAILING(*(uint64_t*)0x200002a8 = 0);
  NONFAILING(*(uint32_t*)0x200002b0 = 0);
  syscall(__NR_sendmsg, r[0], 0x20000280ul, 0ul);
  res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint64_t*)0x20000040 = 0);
  NONFAILING(*(uint32_t*)0x20000048 = 0);
  NONFAILING(*(uint64_t*)0x20000050 = 0x20000240);
  NONFAILING(*(uint64_t*)0x20000240 = 0x20000340);
  NONFAILING(memcpy((void*)0x20000340, "\x40\x00\x00\x00\x10\x00\x05\x07\x03"
                                       "\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                                       "\x00\x00",
                    20));
  NONFAILING(*(uint32_t*)0x20000354 = 0);
  NONFAILING(memcpy((void*)0x20000358,
                    "\x0f\xff\x00\x00\x08\x00\x00\x00\x18\x00\x12\x80\x08\x00"
                    "\x01\x00\x73\x69\x74\x00\x0c\x00\x02\x80\x08\x00\x01\x00",
                    28));
  NONFAILING(*(uint32_t*)0x20000374 = -1);
  NONFAILING(memcpy((void*)0x20000378, "\x08\x00\x04\x00", 4));
  NONFAILING(*(uint32_t*)0x2000037c = -1);
  NONFAILING(memcpy((void*)0x20000380, "\x92\x8c\xa6\x53\xde\xfe\xda\x42\x00"
                                       "\x71\x3d\x97\xf6\xdd\x5f\x8e\x4f\x07"
                                       "\xee\x5f\xd0\xa3\xf6\x5e\x6e",
                    25));
  NONFAILING(*(uint64_t*)0x20000248 = 0x40);
  NONFAILING(*(uint64_t*)0x20000058 = 1);
  NONFAILING(*(uint64_t*)0x20000060 = 0);
  NONFAILING(*(uint64_t*)0x20000068 = 0);
  NONFAILING(*(uint32_t*)0x20000070 = 0);
  syscall(__NR_sendmsg, r[1], 0x20000040ul, 0ul);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  install_segv_handler();
  use_temporary_dir();
  loop();
  return 0;
}